App.tsx

import React, { useContext } from "react";
import { flushSync } from "react-dom";

import { RoughCanvas } from "roughjs/bin/canvas";
import rough from "roughjs/bin/rough";
import clsx from "clsx";
import { nanoid } from "nanoid";

import {
  actionAddToLibrary,
  actionBringForward,
  actionBringToFront,
  actionCopy,
  actionCopyAsPng,
  actionCopyAsSvg,
  copyText,
  actionCopyStyles,
  actionCut,
  actionDeleteSelected,
  actionDuplicateSelection,
  actionFinalize,
  actionFlipHorizontal,
  actionFlipVertical,
  actionGroup,
  actionPasteStyles,
  actionSelectAll,
  actionSendBackward,
  actionSendToBack,
  actionToggleGridMode,
  actionToggleStats,
  actionToggleZenMode,
  actionUnbindText,
  actionBindText,
  actionUngroup,
  actionLink,
  actionToggleElementLock,
  actionToggleLinearEditor,
  actionToggleObjectsSnapMode,
  actionZoomToFit,
} from "../actions";
import { createRedoAction, createUndoAction } from "../actions/actionHistory";
import { ActionManager } from "../actions/manager";
import { actions } from "../actions/register";
import { ActionResult } from "../actions/types";
import { trackEvent } from "../analytics";
import {
  getDefaultAppState,
  isEraserActive,
  isHandToolActive,
} from "../appState";
import { PastedMixedContent, parseClipboard } from "../clipboard";
import {
  APP_NAME,
  CURSOR_TYPE,
  DEFAULT_MAX_IMAGE_WIDTH_OR_HEIGHT,
  DEFAULT_UI_OPTIONS,
  DEFAULT_VERTICAL_ALIGN,
  DRAGGING_THRESHOLD,
  ELEMENT_READY_TO_ERASE_OPACITY,
  ELEMENT_SHIFT_TRANSLATE_AMOUNT,
  ELEMENT_TRANSLATE_AMOUNT,
  ENV,
  EVENT,
  FRAME_STYLE,
  EXPORT_IMAGE_TYPES,
  GRID_SIZE,
  IMAGE_MIME_TYPES,
  IMAGE_RENDER_TIMEOUT,
  isAndroid,
  isBrave,
  LINE_CONFIRM_THRESHOLD,
  MAX_ALLOWED_FILE_BYTES,
  MIME_TYPES,
  MQ_MAX_HEIGHT_LANDSCAPE,
  MQ_MAX_WIDTH_LANDSCAPE,
  MQ_MAX_WIDTH_PORTRAIT,
  MQ_RIGHT_SIDEBAR_MIN_WIDTH,
  POINTER_BUTTON,
  ROUNDNESS,
  SCROLL_TIMEOUT,
  TAP_TWICE_TIMEOUT,
  TEXT_TO_CENTER_SNAP_THRESHOLD,
  THEME,
  THEME_FILTER,
  TOUCH_CTX_MENU_TIMEOUT,
  VERTICAL_ALIGN,
  YOUTUBE_STATES,
  ZOOM_STEP,
  POINTER_EVENTS,
} from "../constants";
import { ExportedElements, exportCanvas, loadFromBlob } from "../data";
import Library, { distributeLibraryItemsOnSquareGrid } from "../data/library";
import { restore, restoreElements } from "../data/restore";
import {
  dragNewElement,
  dragSelectedElements,
  duplicateElement,
  getCommonBounds,
  getCursorForResizingElement,
  getDragOffsetXY,
  getElementWithTransformHandleType,
  getNormalizedDimensions,
  getResizeArrowDirection,
  getResizeOffsetXY,
  getLockedLinearCursorAlignSize,
  getTransformHandleTypeFromCoords,
  hitTest,
  isHittingElementBoundingBoxWithoutHittingElement,
  isInvisiblySmallElement,
  isNonDeletedElement,
  isTextElement,
  newElement,
  newLinearElement,
  newTextElement,
  newImageElement,
  textWysiwyg,
  transformElements,
  updateTextElement,
  redrawTextBoundingBox,
} from "../element";
import {
  bindOrUnbindLinearElement,
  bindOrUnbindSelectedElements,
  fixBindingsAfterDeletion,
  fixBindingsAfterDuplication,
  getEligibleElementsForBinding,
  getHoveredElementForBinding,
  isBindingEnabled,
  isLinearElementSimpleAndAlreadyBound,
  maybeBindLinearElement,
  shouldEnableBindingForPointerEvent,
  unbindLinearElements,
  updateBoundElements,
} from "../element/binding";
import { LinearElementEditor } from "../element/linearElementEditor";
import { mutateElement, newElementWith } from "../element/mutateElement";
import {
  deepCopyElement,
  duplicateElements,
  newFrameElement,
  newFreeDrawElement,
  newEmbeddableElement,
} from "../element/newElement";
import {
  hasBoundTextElement,
  isArrowElement,
  isBindingElement,
  isBindingElementType,
  isBoundToContainer,
  isFrameElement,
  isImageElement,
  isEmbeddableElement,
  isInitializedImageElement,
  isLinearElement,
  isLinearElementType,
  isUsingAdaptiveRadius,
} from "../element/typeChecks";
import {
  ExcalidrawBindableElement,
  ExcalidrawElement,
  ExcalidrawFreeDrawElement,
  ExcalidrawGenericElement,
  ExcalidrawLinearElement,
  ExcalidrawTextElement,
  NonDeleted,
  InitializedExcalidrawImageElement,
  ExcalidrawImageElement,
  FileId,
  NonDeletedExcalidrawElement,
  ExcalidrawTextContainer,
  ExcalidrawFrameElement,
  ExcalidrawEmbeddableElement,
} from "../element/types";
import { getCenter, getDistance } from "../gesture";
import {
  editGroupForSelectedElement,
  getElementsInGroup,
  getSelectedGroupIdForElement,
  getSelectedGroupIds,
  isElementInGroup,
  isSelectedViaGroup,
  selectGroupsForSelectedElements,
} from "../groups";
import History from "../history";
import { defaultLang, getLanguage, languages, setLanguage, t } from "../i18n";
import {
  CODES,
  shouldResizeFromCenter,
  shouldMaintainAspectRatio,
  shouldRotateWithDiscreteAngle,
  isArrowKey,
  KEYS,
} from "../keys";
import { isElementInViewport } from "../element/sizeHelpers";
import {
  distance2d,
  getCornerRadius,
  getGridPoint,
  isPathALoop,
} from "../math";
import {
  calculateScrollCenter,
  getElementsAtPosition,
  getElementsWithinSelection,
  getNormalizedZoom,
  getSelectedElements,
  hasBackground,
  isOverScrollBars,
  isSomeElementSelected,
} from "../scene";
import Scene from "../scene/Scene";
import { RenderInteractiveSceneCallback, ScrollBars } from "../scene/types";
import { getStateForZoom } from "../scene/zoom";
import { findShapeByKey } from "../shapes";
import {
  AppClassProperties,
  AppProps,
  AppState,
  BinaryFileData,
  DataURL,
  ExcalidrawImperativeAPI,
  BinaryFiles,
  Gesture,
  GestureEvent,
  LibraryItems,
  PointerDownState,
  SceneData,
  Device,
  FrameNameBoundsCache,
  SidebarName,
  SidebarTabName,
  KeyboardModifiersObject,
  CollaboratorPointer,
  ToolType,
} from "../types";
import {
  debounce,
  distance,
  getFontString,
  getNearestScrollableContainer,
  isInputLike,
  isToolIcon,
  isWritableElement,
  sceneCoordsToViewportCoords,
  tupleToCoors,
  viewportCoordsToSceneCoords,
  withBatchedUpdates,
  wrapEvent,
  withBatchedUpdatesThrottled,
  updateObject,
  updateActiveTool,
  getShortcutKey,
  isTransparent,
  easeToValuesRAF,
  muteFSAbortError,
  isTestEnv,
  easeOut,
} from "../utils";
import {
  embeddableURLValidator,
  extractSrc,
  getEmbedLink,
} from "../element/embeddable";
import {
  ContextMenu,
  ContextMenuItems,
  CONTEXT_MENU_SEPARATOR,
} from "./ContextMenu";
import LayerUI from "./LayerUI";
import { Toast } from "./Toast";
import { actionToggleViewMode } from "../actions/actionToggleViewMode";
import {
  dataURLToFile,
  generateIdFromFile,
  getDataURL,
  getFileFromEvent,
  ImageURLToFile,
  isImageFileHandle,
  isSupportedImageFile,
  loadSceneOrLibraryFromBlob,
  normalizeFile,
  parseLibraryJSON,
  resizeImageFile,
  SVGStringToFile,
} from "../data/blob";
import {
  getInitializedImageElements,
  loadHTMLImageElement,
  normalizeSVG,
  updateImageCache as _updateImageCache,
} from "../element/image";
import throttle from "lodash.throttle";
import { fileOpen, FileSystemHandle } from "../data/filesystem";
import {
  bindTextToShapeAfterDuplication,
  getApproxMinLineHeight,
  getApproxMinLineWidth,
  getBoundTextElement,
  getContainerCenter,
  getContainerElement,
  getDefaultLineHeight,
  getLineHeightInPx,
  getTextBindableContainerAtPosition,
  isMeasureTextSupported,
  isValidTextContainer,
} from "../element/textElement";
import { isHittingElementNotConsideringBoundingBox } from "../element/collision";
import {
  showHyperlinkTooltip,
  hideHyperlinkToolip,
  Hyperlink,
  isPointHittingLink,
  isPointHittingLinkIcon,
} from "../element/Hyperlink";
import { isLocalLink, normalizeLink, toValidURL } from "../data/url";
import { shouldShowBoundingBox } from "../element/transformHandles";
import { actionUnlockAllElements } from "../actions/actionElementLock";
import { Fonts } from "../scene/Fonts";
import {
  getFrameChildren,
  isCursorInFrame,
  bindElementsToFramesAfterDuplication,
  addElementsToFrame,
  replaceAllElementsInFrame,
  removeElementsFromFrame,
  getElementsInResizingFrame,
  getElementsInNewFrame,
  getContainingFrame,
  elementOverlapsWithFrame,
  updateFrameMembershipOfSelectedElements,
  isElementInFrame,
} from "../frame";
import {
  excludeElementsInFramesFromSelection,
  makeNextSelectedElementIds,
} from "../scene/selection";
import { actionPaste } from "../actions/actionClipboard";
import {
  actionRemoveAllElementsFromFrame,
  actionSelectAllElementsInFrame,
} from "../actions/actionFrame";
import { actionToggleHandTool, zoomToFit } from "../actions/actionCanvas";
import { jotaiStore } from "../jotai";
import { activeConfirmDialogAtom } from "./ActiveConfirmDialog";
import { ImageSceneDataError } from "../errors";
import {
  getSnapLinesAtPointer,
  snapDraggedElements,
  isActiveToolNonLinearSnappable,
  snapNewElement,
  snapResizingElements,
  isSnappingEnabled,
  getVisibleGaps,
  getReferenceSnapPoints,
  SnapCache,
} from "../snapping";
import { actionWrapTextInContainer } from "../actions/actionBoundText";
import BraveMeasureTextError from "./BraveMeasureTextError";
import { activeEyeDropperAtom } from "./EyeDropper";
import {
  ExcalidrawElementSkeleton,
  convertToExcalidrawElements,
} from "../data/transform";
import { ValueOf } from "../utility-types";
import { isSidebarDockedAtom } from "./Sidebar/Sidebar";
import { StaticCanvas, InteractiveCanvas } from "./canvases";
import { Renderer } from "../scene/Renderer";
import { ShapeCache } from "../scene/ShapeCache";
import MermaidToExcalidraw from "./MermaidToExcalidraw";
import { LaserToolOverlay } from "./LaserTool/LaserTool";
import { LaserPathManager } from "./LaserTool/LaserPathManager";
import {
  setEraserCursor,
  setCursor,
  resetCursor,
  setCursorForShape,
} from "../cursor";
import { Emitter } from "../emitter";

const AppContext = React.createContext<AppClassProperties>(null!);
const AppPropsContext = React.createContext<AppProps>(null!);

const deviceContextInitialValue = {
  viewport: {
    isMobile: false,
    isLandscape: false,
  },
  editor: {
    isMobile: false,
    canFitSidebar: false,
  },
  isTouchScreen: false,
};
const DeviceContext = React.createContext<Device>(deviceContextInitialValue);
DeviceContext.displayName = "DeviceContext";

export const ExcalidrawContainerContext = React.createContext<{
  container: HTMLDivElement | null;
  id: string | null;
}>({ container: null, id: null });
ExcalidrawContainerContext.displayName = "ExcalidrawContainerContext";

const ExcalidrawElementsContext = React.createContext<
  readonly NonDeletedExcalidrawElement[]
>([]);
ExcalidrawElementsContext.displayName = "ExcalidrawElementsContext";

const ExcalidrawAppStateContext = React.createContext<AppState>({
  ...getDefaultAppState(),
  width: 0,
  height: 0,
  offsetLeft: 0,
  offsetTop: 0,
});
ExcalidrawAppStateContext.displayName = "ExcalidrawAppStateContext";

const ExcalidrawSetAppStateContext = React.createContext<
  React.Component<any, AppState>["setState"]
>(() => {
  console.warn("unitialized ExcalidrawSetAppStateContext context!");
});
ExcalidrawSetAppStateContext.displayName = "ExcalidrawSetAppStateContext";

const ExcalidrawActionManagerContext = React.createContext<ActionManager>(
  null!,
);
ExcalidrawActionManagerContext.displayName = "ExcalidrawActionManagerContext";

export const useApp = () => useContext(AppContext);
export const useAppProps = () => useContext(AppPropsContext);
export const useDevice = () => useContext<Device>(DeviceContext);
export const useExcalidrawContainer = () =>
  useContext(ExcalidrawContainerContext);
export const useExcalidrawElements = () =>
  useContext(ExcalidrawElementsContext);
export const useExcalidrawAppState = () =>
  useContext(ExcalidrawAppStateContext);
export const useExcalidrawSetAppState = () =>
  useContext(ExcalidrawSetAppStateContext);
export const useExcalidrawActionManager = () =>
  useContext(ExcalidrawActionManagerContext);

const supportsResizeObserver =
  typeof window !== "undefined" && "ResizeObserver" in window;

let didTapTwice: boolean = false;
let tappedTwiceTimer = 0;
let isHoldingSpace: boolean = false;
let isPanning: boolean = false;
let isDraggingScrollBar: boolean = false;
let currentScrollBars: ScrollBars = { horizontal: null, vertical: null };
let touchTimeout = 0;
let invalidateContextMenu = false;

/**
 * Map of youtube embed video states
 */
const YOUTUBE_VIDEO_STATES = new Map<
  ExcalidrawElement["id"],
  ValueOf<typeof YOUTUBE_STATES>
>();

let IS_PLAIN_PASTE = false;
let IS_PLAIN_PASTE_TIMER = 0;
let PLAIN_PASTE_TOAST_SHOWN = false;

let lastPointerUp: ((event: any) => void) | null = null;
const gesture: Gesture = {
  pointers: new Map(),
  lastCenter: null,
  initialDistance: null,
  initialScale: null,
};

class App extends React.Component<AppProps, AppState> {
  canvas: AppClassProperties["canvas"];
  interactiveCanvas: AppClassProperties["interactiveCanvas"] = null;
  rc: RoughCanvas;
  unmounted: boolean = false;
  actionManager: ActionManager;
  device: Device = deviceContextInitialValue;

  private excalidrawContainerRef = React.createRef<HTMLDivElement>();

  public static defaultProps: Partial<AppProps> = {
    // needed for tests to pass since we directly render App in many tests
    UIOptions: DEFAULT_UI_OPTIONS,
  };

  public scene: Scene;
  public renderer: Renderer;
  private fonts: Fonts;
  private resizeObserver: ResizeObserver | undefined;
  private nearestScrollableContainer: HTMLElement | Document | undefined;
  public library: AppClassProperties["library"];
  public libraryItemsFromStorage: LibraryItems | undefined;
  public id: string;
  private history: History;
  private excalidrawContainerValue: {
    container: HTMLDivElement | null;
    id: string;
  };

  public files: BinaryFiles = {};
  public imageCache: AppClassProperties["imageCache"] = new Map();
  private iFrameRefs = new Map<ExcalidrawElement["id"], HTMLIFrameElement>();

  hitLinkElement?: NonDeletedExcalidrawElement;
  lastPointerDownEvent: React.PointerEvent<HTMLElement> | null = null;
  lastPointerUpEvent: React.PointerEvent<HTMLElement> | PointerEvent | null =
    null;
  lastViewportPosition = { x: 0, y: 0 };

  laserPathManager: LaserPathManager = new LaserPathManager(this);

  onChangeEmitter = new Emitter<
    [
      elements: readonly ExcalidrawElement[],
      appState: AppState,
      files: BinaryFiles,
    ]
  >();

  onPointerDownEmitter = new Emitter<
    [
      activeTool: AppState["activeTool"],
      pointerDownState: PointerDownState,
      event: React.PointerEvent<HTMLElement>,
    ]
  >();

  onPointerUpEmitter = new Emitter<
    [
      activeTool: AppState["activeTool"],
      pointerDownState: PointerDownState,
      event: PointerEvent,
    ]
  >();

  constructor(props: AppProps) {
    super(props);
    const defaultAppState = getDefaultAppState();
    const {
      excalidrawAPI,
      viewModeEnabled = false,
      zenModeEnabled = false,
      gridModeEnabled = false,
      objectsSnapModeEnabled = false,
      theme = defaultAppState.theme,
      name = defaultAppState.name,
    } = props;
    this.state = {
      ...defaultAppState,
      theme,
      isLoading: true,
      ...this.getCanvasOffsets(),
      viewModeEnabled,
      zenModeEnabled,
      objectsSnapModeEnabled,
      gridSize: gridModeEnabled ? GRID_SIZE : null,
      name,
      width: window.innerWidth,
      height: window.innerHeight,
    };

    this.id = nanoid();

    this.library = new Library(this);
    this.scene = new Scene();

    this.canvas = document.createElement("canvas");
    this.rc = rough.canvas(this.canvas);
    this.renderer = new Renderer(this.scene);

    if (excalidrawAPI) {
      const api: ExcalidrawImperativeAPI = {
        updateScene: this.updateScene,
        updateLibrary: this.library.updateLibrary,
        addFiles: this.addFiles,
        resetScene: this.resetScene,
        getSceneElementsIncludingDeleted: this.getSceneElementsIncludingDeleted,
        history: {
          clear: this.resetHistory,
        },
        scrollToContent: this.scrollToContent,
        zoomToFit: this.zoomToFit,
        getSceneElements: this.getSceneElements,
        getAppState: () => this.state,
        getFiles: () => this.files,
        refresh: this.refresh,
        setToast: this.setToast,
        id: this.id,
        setActiveTool: this.setActiveTool,
        setCursor: this.setCursor,
        resetCursor: this.resetCursor,
        updateFrameRendering: this.updateFrameRendering,
        toggleSidebar: this.toggleSidebar,
        onChange: (cb) => this.onChangeEmitter.on(cb),
        onPointerDown: (cb) => this.onPointerDownEmitter.on(cb),
        onPointerUp: (cb) => this.onPointerUpEmitter.on(cb),
      } as const;
      if (typeof excalidrawAPI === "function") {
        excalidrawAPI(api);
      } else {
        console.error("excalidrawAPI should be a function!");
      }
    }

    this.excalidrawContainerValue = {
      container: this.excalidrawContainerRef.current,
      id: this.id,
    };

    this.fonts = new Fonts({
      scene: this.scene,
      onSceneUpdated: this.onSceneUpdated,
    });
    this.history = new History();
    this.actionManager = new ActionManager(
      this.syncActionResult,
      () => this.state,
      () => this.scene.getElementsIncludingDeleted(),
      this,
    );
    this.actionManager.registerAll(actions);

    this.actionManager.registerAction(createUndoAction(this.history));
    this.actionManager.registerAction(createRedoAction(this.history));
  }

  private onWindowMessage(event: MessageEvent) {
    if (
      event.origin !== "https://player.vimeo.com" &&
      event.origin !== "https://www.youtube.com"
    ) {
      return;
    }

    let data = null;
    try {
      data = JSON.parse(event.data);
    } catch (e) {}
    if (!data) {
      return;
    }

    switch (event.origin) {
      case "https://player.vimeo.com":
        //Allowing for multiple instances of Excalidraw running in the window
        if (data.method === "paused") {
          let source: Window | null = null;
          const iframes = document.body.querySelectorAll(
            "iframe.excalidraw__embeddable",
          );
          if (!iframes) {
            break;
          }
          for (const iframe of iframes as NodeListOf<HTMLIFrameElement>) {
            if (iframe.contentWindow === event.source) {
              source = iframe.contentWindow;
            }
          }
          source?.postMessage(
            JSON.stringify({
              method: data.value ? "play" : "pause",
              value: true,
            }),
            "*",
          );
        }
        break;
      case "https://www.youtube.com":
        if (
          data.event === "infoDelivery" &&
          data.info &&
          data.id &&
          typeof data.info.playerState === "number"
        ) {
          const id = data.id;
          const playerState = data.info.playerState as number;
          if (
            (Object.values(YOUTUBE_STATES) as number[]).includes(playerState)
          ) {
            YOUTUBE_VIDEO_STATES.set(
              id,
              playerState as ValueOf<typeof YOUTUBE_STATES>,
            );
          }
        }
        break;
    }
  }

  private updateEmbeddableRef(
    id: ExcalidrawEmbeddableElement["id"],
    ref: HTMLIFrameElement | null,
  ) {
    if (ref) {
      this.iFrameRefs.set(id, ref);
    }
  }

  private getHTMLIFrameElement(
    id: ExcalidrawEmbeddableElement["id"],
  ): HTMLIFrameElement | undefined {
    return this.iFrameRefs.get(id);
  }

  private handleEmbeddableCenterClick(element: ExcalidrawEmbeddableElement) {
    if (
      this.state.activeEmbeddable?.element === element &&
      this.state.activeEmbeddable?.state === "active"
    ) {
      return;
    }

    // The delay serves two purposes
    // 1. To prevent first click propagating to iframe on mobile,
    //    else the click will immediately start and stop the video
    // 2. If the user double clicks the frame center to activate it
    //    without the delay youtube will immediately open the video
    //    in fullscreen mode
    setTimeout(() => {
      this.setState({
        activeEmbeddable: { element, state: "active" },
        selectedElementIds: { [element.id]: true },
        draggingElement: null,
        selectionElement: null,
      });
    }, 100);

    const iframe = this.getHTMLIFrameElement(element.id);

    if (!iframe?.contentWindow) {
      return;
    }

    if (iframe.src.includes("youtube")) {
      const state = YOUTUBE_VIDEO_STATES.get(element.id);
      if (!state) {
        YOUTUBE_VIDEO_STATES.set(element.id, YOUTUBE_STATES.UNSTARTED);
        iframe.contentWindow.postMessage(
          JSON.stringify({
            event: "listening",
            id: element.id,
          }),
          "*",
        );
      }
      switch (state) {
        case YOUTUBE_STATES.PLAYING:
        case YOUTUBE_STATES.BUFFERING:
          iframe.contentWindow?.postMessage(
            JSON.stringify({
              event: "command",
              func: "pauseVideo",
              args: "",
            }),
            "*",
          );
          break;
        default:
          iframe.contentWindow?.postMessage(
            JSON.stringify({
              event: "command",
              func: "playVideo",
              args: "",
            }),
            "*",
          );
      }
    }

    if (iframe.src.includes("player.vimeo.com")) {
      iframe.contentWindow.postMessage(
        JSON.stringify({
          method: "paused", //video play/pause in onWindowMessage handler
        }),
        "*",
      );
    }
  }

  private isEmbeddableCenter(
    el: ExcalidrawEmbeddableElement | null,
    event: React.PointerEvent<HTMLElement> | PointerEvent,
    sceneX: number,
    sceneY: number,
  ) {
    return (
      el &&
      !event.altKey &&
      !event.shiftKey &&
      !event.metaKey &&
      !event.ctrlKey &&
      (this.state.activeEmbeddable?.element !== el ||
        this.state.activeEmbeddable?.state === "hover" ||
        !this.state.activeEmbeddable) &&
      sceneX >= el.x + el.width / 3 &&
      sceneX <= el.x + (2 * el.width) / 3 &&
      sceneY >= el.y + el.height / 3 &&
      sceneY <= el.y + (2 * el.height) / 3
    );
  }

  private updateEmbeddables = () => {
    const embeddableElements = new Map<ExcalidrawElement["id"], true>();

    let updated = false;
    this.scene.getNonDeletedElements().filter((element) => {
      if (isEmbeddableElement(element)) {
        embeddableElements.set(element.id, true);
        if (element.validated == null) {
          updated = true;

          const validated = embeddableURLValidator(
            element.link,
            this.props.validateEmbeddable,
          );

          mutateElement(element, { validated }, false);
          ShapeCache.delete(element);
        }
      }
      return false;
    });

    if (updated) {
      this.scene.informMutation();
    }

    // GC
    this.iFrameRefs.forEach((ref, id) => {
      if (!embeddableElements.has(id)) {
        this.iFrameRefs.delete(id);
      }
    });
  };

  private renderEmbeddables() {
    const scale = this.state.zoom.value;
    const normalizedWidth = this.state.width;
    const normalizedHeight = this.state.height;

    const embeddableElements = this.scene
      .getNonDeletedElements()
      .filter(
        (el): el is NonDeleted<ExcalidrawEmbeddableElement> =>
          isEmbeddableElement(el) && !!el.validated,
      );

    return (
      <>
        {embeddableElements.map((el) => {
          const { x, y } = sceneCoordsToViewportCoords(
            { sceneX: el.x, sceneY: el.y },
            this.state,
          );
          const embedLink = getEmbedLink(toValidURL(el.link || ""));
          const isVisible = isElementInViewport(
            el,
            normalizedWidth,
            normalizedHeight,
            this.state,
          );
          const isActive =
            this.state.activeEmbeddable?.element === el &&
            this.state.activeEmbeddable?.state === "active";
          const isHovered =
            this.state.activeEmbeddable?.element === el &&
            this.state.activeEmbeddable?.state === "hover";

          return (
            <div
              key={el.id}
              className={clsx("excalidraw__embeddable-container", {
                "is-hovered": isHovered,
              })}
              style={{
                transform: isVisible
                  ? `translate(${x - this.state.offsetLeft}px, ${
                      y - this.state.offsetTop
                    }px) scale(${scale})`
                  : "none",
                display: isVisible ? "block" : "none",
                opacity: el.opacity / 100,
                ["--embeddable-radius" as string]: `${getCornerRadius(
                  Math.min(el.width, el.height),
                  el,
                )}px`,
              }}
            >
              <div
                //this is a hack that addresses isse with embedded excalidraw.com embeddable
                //https://github.com/excalidraw/excalidraw/pull/6691#issuecomment-1607383938
                /*ref={(ref) => {
                  if (!this.excalidrawContainerRef.current) {
                    return;
                  }
                  const container = this.excalidrawContainerRef.current;
                  const sh = container.scrollHeight;
                  const ch = container.clientHeight;
                  if (sh !== ch) {
                    container.style.height = `${sh}px`;
                    setTimeout(() => {
                      container.style.height = `100%`;
                    });
                  }
                }}*/
                className="excalidraw__embeddable-container__inner"
                style={{
                  width: isVisible ? `${el.width}px` : 0,
                  height: isVisible ? `${el.height}px` : 0,
                  transform: isVisible ? `rotate(${el.angle}rad)` : "none",
                  pointerEvents: isActive
                    ? POINTER_EVENTS.enabled
                    : POINTER_EVENTS.disabled,
                }}
              >
                {isHovered && (
                  <div className="excalidraw__embeddable-hint">
                    {t("buttons.embeddableInteractionButton")}
                  </div>
                )}
                <div
                  className="excalidraw__embeddable__outer"
                  style={{
                    padding: `${el.strokeWidth}px`,
                  }}
                >
                  {this.props.renderEmbeddable?.(el, this.state) ?? (
                    <iframe
                      ref={(ref) => this.updateEmbeddableRef(el.id, ref)}
                      className="excalidraw__embeddable"
                      srcDoc={
                        embedLink?.type === "document"
                          ? embedLink.srcdoc(this.state.theme)
                          : undefined
                      }
                      src={
                        embedLink?.type !== "document"
                          ? embedLink?.link ?? ""
                          : undefined
                      }
                      // https://stackoverflow.com/q/18470015
                      scrolling="no"
                      referrerPolicy="no-referrer-when-downgrade"
                      title="Excalidraw Embedded Content"
                      allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
                      allowFullScreen={true}
                      sandbox="allow-same-origin allow-scripts allow-forms allow-popups allow-popups-to-escape-sandbox allow-presentation allow-downloads"
                    />
                  )}
                </div>
              </div>
            </div>
          );
        })}
      </>
    );
  }

  private getFrameNameDOMId = (frameElement: ExcalidrawElement) => {
    return `${this.id}-frame-name-${frameElement.id}`;
  };

  frameNameBoundsCache: FrameNameBoundsCache = {
    get: (frameElement) => {
      let bounds = this.frameNameBoundsCache._cache.get(frameElement.id);
      if (
        !bounds ||
        bounds.zoom !== this.state.zoom.value ||
        bounds.versionNonce !== frameElement.versionNonce
      ) {
        const frameNameDiv = document.getElementById(
          this.getFrameNameDOMId(frameElement),
        );

        if (frameNameDiv) {
          const box = frameNameDiv.getBoundingClientRect();
          const boxSceneTopLeft = viewportCoordsToSceneCoords(
            { clientX: box.x, clientY: box.y },
            this.state,
          );
          const boxSceneBottomRight = viewportCoordsToSceneCoords(
            { clientX: box.right, clientY: box.bottom },
            this.state,
          );

          bounds = {
            x: boxSceneTopLeft.x,
            y: boxSceneTopLeft.y,
            width: boxSceneBottomRight.x - boxSceneTopLeft.x,
            height: boxSceneBottomRight.y - boxSceneTopLeft.y,
            angle: 0,
            zoom: this.state.zoom.value,
            versionNonce: frameElement.versionNonce,
          };

          this.frameNameBoundsCache._cache.set(frameElement.id, bounds);

          return bounds;
        }
        return null;
      }

      return bounds;
    },
    /**
     * @private
     */
    _cache: new Map(),
  };

  private renderFrameNames = () => {
    if (!this.state.frameRendering.enabled || !this.state.frameRendering.name) {
      return null;
    }

    const isDarkTheme = this.state.theme === "dark";

    return this.scene.getNonDeletedFrames().map((f, index) => {
      if (
        !isElementInViewport(
          f,
          this.canvas.width / window.devicePixelRatio,
          this.canvas.height / window.devicePixelRatio,
          {
            offsetLeft: this.state.offsetLeft,
            offsetTop: this.state.offsetTop,
            scrollX: this.state.scrollX,
            scrollY: this.state.scrollY,
            zoom: this.state.zoom,
          },
        )
      ) {
        // if frame not visible, don't render its name
        return null;
      }

      const { x: x1, y: y1 } = sceneCoordsToViewportCoords(
        { sceneX: f.x, sceneY: f.y },
        this.state,
      );

      const FRAME_NAME_EDIT_PADDING = 6;

      const reset = () => {
        if (f.name?.trim() === "") {
          mutateElement(f, { name: null });
        }

        this.setState({ editingFrame: null });
      };

      let frameNameJSX;

      if (f.id === this.state.editingFrame) {
        const frameNameInEdit = f.name == null ? `Frame ${index + 1}` : f.name;

        frameNameJSX = (
          <input
            autoFocus
            value={frameNameInEdit}
            onChange={(e) => {
              mutateElement(f, {
                name: e.target.value,
              });
            }}
            onBlur={() => reset()}
            onKeyDown={(event) => {
              // for some inexplicable reason, `onBlur` triggered on ESC
              // does not reset `state.editingFrame` despite being called,
              // and we need to reset it here as well
              if (event.key === KEYS.ESCAPE || event.key === KEYS.ENTER) {
                reset();
              }
            }}
            style={{
              background: this.state.viewBackgroundColor,
              filter: isDarkTheme ? THEME_FILTER : "none",
              zIndex: 2,
              border: "none",
              display: "block",
              padding: `${FRAME_NAME_EDIT_PADDING}px`,
              borderRadius: 4,
              boxShadow: "inset 0 0 0 1px var(--color-primary)",
              fontFamily: "Assistant",
              fontSize: "14px",
              transform: `translate(-${FRAME_NAME_EDIT_PADDING}px, ${FRAME_NAME_EDIT_PADDING}px)`,
              color: "var(--color-gray-80)",
              overflow: "hidden",
              maxWidth: `${
                document.body.clientWidth - x1 - FRAME_NAME_EDIT_PADDING
              }px`,
            }}
            size={frameNameInEdit.length + 1 || 1}
            dir="auto"
            autoComplete="off"
            autoCapitalize="off"
            autoCorrect="off"
          />
        );
      } else {
        frameNameJSX =
          f.name == null || f.name.trim() === ""
            ? `Frame ${index + 1}`
            : f.name.trim();
      }

      return (
        <div
          id={this.getFrameNameDOMId(f)}
          key={f.id}
          style={{
            position: "absolute",
            // Positioning from bottom so that we don't to either
            // calculate text height or adjust using transform (which)
            // messes up input position when editing the frame name.
            // This makes the positioning deterministic and we can calculate
            // the same position when rendering to canvas / svg.
            bottom: `${
              this.state.height +
              FRAME_STYLE.nameOffsetY -
              y1 +
              this.state.offsetTop
            }px`,
            left: `${x1 - this.state.offsetLeft}px`,
            zIndex: 2,
            fontSize: FRAME_STYLE.nameFontSize,
            color: isDarkTheme
              ? FRAME_STYLE.nameColorDarkTheme
              : FRAME_STYLE.nameColorLightTheme,
            lineHeight: FRAME_STYLE.nameLineHeight,
            width: "max-content",
            maxWidth: `${f.width}px`,
            overflow: f.id === this.state.editingFrame ? "visible" : "hidden",
            whiteSpace: "nowrap",
            textOverflow: "ellipsis",
            cursor: CURSOR_TYPE.MOVE,
            pointerEvents: this.state.viewModeEnabled
              ? POINTER_EVENTS.disabled
              : POINTER_EVENTS.enabled,
          }}
          onPointerDown={(event) => this.handleCanvasPointerDown(event)}
          onWheel={(event) => this.handleWheel(event)}
          onContextMenu={this.handleCanvasContextMenu}
          onDoubleClick={() => {
            this.setState({
              editingFrame: f.id,
            });
          }}
        >
          {frameNameJSX}
        </div>
      );
    });
  };

  public render() {
    const selectedElements = this.scene.getSelectedElements(this.state);
    const { renderTopRightUI, renderCustomStats } = this.props;

    const versionNonce = this.scene.getVersionNonce();
    const { canvasElements, visibleElements } =
      this.renderer.getRenderableElements({
        versionNonce,
        zoom: this.state.zoom,
        offsetLeft: this.state.offsetLeft,
        offsetTop: this.state.offsetTop,
        scrollX: this.state.scrollX,
        scrollY: this.state.scrollY,
        height: this.state.height,
        width: this.state.width,
        editingElement: this.state.editingElement,
        pendingImageElementId: this.state.pendingImageElementId,
      });

    const shouldBlockPointerEvents =
      !(
        this.state.editingElement && isLinearElement(this.state.editingElement)
      ) &&
      (this.state.selectionElement ||
        this.state.draggingElement ||
        this.state.resizingElement ||
        (this.state.activeTool.type === "laser" &&
          // technically we can just test on this once we make it more safe
          this.state.cursorButton === "down") ||
        (this.state.editingElement &&
          !isTextElement(this.state.editingElement)));

    return (
      <div
        className={clsx("excalidraw excalidraw-container", {
          "excalidraw--view-mode": this.state.viewModeEnabled,
          "excalidraw--mobile": this.device.editor.isMobile,
        })}
        style={{
          ["--ui-pointerEvents" as any]: shouldBlockPointerEvents
            ? POINTER_EVENTS.disabled
            : POINTER_EVENTS.enabled,
        }}
        ref={this.excalidrawContainerRef}
        onDrop={this.handleAppOnDrop}
        tabIndex={0}
        onKeyDown={
          this.props.handleKeyboardGlobally ? undefined : this.onKeyDown
        }
      >
        <AppContext.Provider value={this}>
          <AppPropsContext.Provider value={this.props}>
            <ExcalidrawContainerContext.Provider
              value={this.excalidrawContainerValue}
            >
              <DeviceContext.Provider value={this.device}>
                <ExcalidrawSetAppStateContext.Provider value={this.setAppState}>
                  <ExcalidrawAppStateContext.Provider value={this.state}>
                    <ExcalidrawElementsContext.Provider
                      value={this.scene.getNonDeletedElements()}
                    >
                      <ExcalidrawActionManagerContext.Provider
                        value={this.actionManager}
                      >
                        <LayerUI
                          canvas={this.canvas}
                          appState={this.state}
                          files={this.files}
                          setAppState={this.setAppState}
                          actionManager={this.actionManager}
                          elements={this.scene.getNonDeletedElements()}
                          onLockToggle={this.toggleLock}
                          onPenModeToggle={this.togglePenMode}
                          onHandToolToggle={this.onHandToolToggle}
                          langCode={getLanguage().code}
                          renderTopRightUI={renderTopRightUI}
                          renderCustomStats={renderCustomStats}
                          showExitZenModeBtn={
                            typeof this.props?.zenModeEnabled === "undefined" &&
                            this.state.zenModeEnabled
                          }
                          UIOptions={this.props.UIOptions}
                          onExportImage={this.onExportImage}
                          renderWelcomeScreen={
                            !this.state.isLoading &&
                            this.state.showWelcomeScreen &&
                            this.state.activeTool.type === "selection" &&
                            !this.state.zenModeEnabled &&
                            !this.scene.getElementsIncludingDeleted().length
                          }
                          app={this}
                          isCollaborating={this.props.isCollaborating}
                        >
                          {this.props.children}
                          {this.state.openDialog === "mermaid" && (
                            <MermaidToExcalidraw />
                          )}
                        </LayerUI>

                        <div className="excalidraw-textEditorContainer" />
                        <div className="excalidraw-contextMenuContainer" />
                        <div className="excalidraw-eye-dropper-container" />
                        <LaserToolOverlay manager={this.laserPathManager} />
                        {selectedElements.length === 1 &&
                          !this.state.contextMenu &&
                          this.state.showHyperlinkPopup && (
                            <Hyperlink
                              key={selectedElements[0].id}
                              element={selectedElements[0]}
                              setAppState={this.setAppState}
                              onLinkOpen={this.props.onLinkOpen}
                              setToast={this.setToast}
                            />
                          )}
                        {this.state.toast !== null && (
                          <Toast
                            message={this.state.toast.message}
                            onClose={() => this.setToast(null)}
                            duration={this.state.toast.duration}
                            closable={this.state.toast.closable}
                          />
                        )}
                        {this.state.contextMenu && (
                          <ContextMenu
                            items={this.state.contextMenu.items}
                            top={this.state.contextMenu.top}
                            left={this.state.contextMenu.left}
                            actionManager={this.actionManager}
                            onClose={(callback) => {
                              this.setState({ contextMenu: null }, () => {
                                this.focusContainer();
                                callback?.();
                              });
                            }}
                          />
                        )}
                        <StaticCanvas
                          canvas={this.canvas}
                          rc={this.rc}
                          elements={canvasElements}
                          visibleElements={visibleElements}
                          versionNonce={versionNonce}
                          selectionNonce={
                            this.state.selectionElement?.versionNonce
                          }
                          scale={window.devicePixelRatio}
                          appState={this.state}
                          renderConfig={{
                            imageCache: this.imageCache,
                            isExporting: false,
                            renderGrid: true,
                          }}
                        />
                        <InteractiveCanvas
                          containerRef={this.excalidrawContainerRef}
                          canvas={this.interactiveCanvas}
                          elements={canvasElements}
                          visibleElements={visibleElements}
                          selectedElements={selectedElements}
                          versionNonce={versionNonce}
                          selectionNonce={
                            this.state.selectionElement?.versionNonce
                          }
                          scale={window.devicePixelRatio}
                          appState={this.state}
                          renderInteractiveSceneCallback={
                            this.renderInteractiveSceneCallback
                          }
                          handleCanvasRef={this.handleInteractiveCanvasRef}
                          onContextMenu={this.handleCanvasContextMenu}
                          onPointerMove={this.handleCanvasPointerMove}
                          onPointerUp={this.handleCanvasPointerUp}
                          onPointerCancel={this.removePointer}
                          onTouchMove={this.handleTouchMove}
                          onPointerDown={this.handleCanvasPointerDown}
                          onDoubleClick={this.handleCanvasDoubleClick}
                        />
                        {this.renderFrameNames()}
                      </ExcalidrawActionManagerContext.Provider>
                      {this.renderEmbeddables()}
                    </ExcalidrawElementsContext.Provider>
                  </ExcalidrawAppStateContext.Provider>
                </ExcalidrawSetAppStateContext.Provider>
              </DeviceContext.Provider>
            </ExcalidrawContainerContext.Provider>
          </AppPropsContext.Provider>
        </AppContext.Provider>
      </div>
    );
  }

  public focusContainer: AppClassProperties["focusContainer"] = () => {
    this.excalidrawContainerRef.current?.focus();
  };

  public getSceneElementsIncludingDeleted = () => {
    return this.scene.getElementsIncludingDeleted();
  };

  public getSceneElements = () => {
    return this.scene.getNonDeletedElements();
  };

  public onInsertElements = (elements: readonly ExcalidrawElement[]) => {
    this.addElementsFromPasteOrLibrary({
      elements,
      position: "center",
      files: null,
    });
  };

  public onExportImage = async (
    type: keyof typeof EXPORT_IMAGE_TYPES,
    elements: ExportedElements,
    opts: { exportingFrame: ExcalidrawFrameElement | null },
  ) => {
    trackEvent("export", type, "ui");
    const fileHandle = await exportCanvas(
      type,
      elements,
      this.state,
      this.files,
      {
        exportBackground: this.state.exportBackground,
        name: this.state.name,
        viewBackgroundColor: this.state.viewBackgroundColor,
        exportingFrame: opts.exportingFrame,
      },
    )
      .catch(muteFSAbortError)
      .catch((error) => {
        console.error(error);
        this.setState({ errorMessage: error.message });
      });

    if (
      this.state.exportEmbedScene &&
      fileHandle &&
      isImageFileHandle(fileHandle)
    ) {
      this.setState({ fileHandle });
    }
  };

  private openEyeDropper = ({ type }: { type: "stroke" | "background" }) => {
    jotaiStore.set(activeEyeDropperAtom, {
      swapPreviewOnAlt: true,
      colorPickerType:
        type === "stroke" ? "elementStroke" : "elementBackground",
      onSelect: (color, event) => {
        const shouldUpdateStrokeColor =
          (type === "background" && event.altKey) ||
          (type === "stroke" && !event.altKey);
        const selectedElements = this.scene.getSelectedElements(this.state);
        if (
          !selectedElements.length ||
          this.state.activeTool.type !== "selection"
        ) {
          if (shouldUpdateStrokeColor) {
            this.syncActionResult({
              appState: { ...this.state, currentItemStrokeColor: color },
              commitToHistory: true,
            });
          } else {
            this.syncActionResult({
              appState: { ...this.state, currentItemBackgroundColor: color },
              commitToHistory: true,
            });
          }
        } else {
          this.updateScene({
            elements: this.scene.getElementsIncludingDeleted().map((el) => {
              if (this.state.selectedElementIds[el.id]) {
                return newElementWith(el, {
                  [shouldUpdateStrokeColor ? "strokeColor" : "backgroundColor"]:
                    color,
                });
              }
              return el;
            }),
          });
        }
      },
      keepOpenOnAlt: false,
    });
  };

  private syncActionResult = withBatchedUpdates(
    (actionResult: ActionResult) => {
      if (this.unmounted || actionResult === false) {
        return;
      }

      let editingElement: AppState["editingElement"] | null = null;
      if (actionResult.elements) {
        actionResult.elements.forEach((element) => {
          if (
            this.state.editingElement?.id === element.id &&
            this.state.editingElement !== element &&
            isNonDeletedElement(element)
          ) {
            editingElement = element;
          }
        });
        this.scene.replaceAllElements(actionResult.elements);
        if (actionResult.commitToHistory) {
          this.history.resumeRecording();
        }
      }

      if (actionResult.files) {
        this.files = actionResult.replaceFiles
          ? actionResult.files
          : { ...this.files, ...actionResult.files };
        this.addNewImagesToImageCache();
      }

      if (actionResult.appState || editingElement || this.state.contextMenu) {
        if (actionResult.commitToHistory) {
          this.history.resumeRecording();
        }

        let viewModeEnabled = actionResult?.appState?.viewModeEnabled || false;
        let zenModeEnabled = actionResult?.appState?.zenModeEnabled || false;
        let gridSize = actionResult?.appState?.gridSize || null;
        const theme =
          actionResult?.appState?.theme || this.props.theme || THEME.LIGHT;
        let name = actionResult?.appState?.name ?? this.state.name;
        const errorMessage =
          actionResult?.appState?.errorMessage ?? this.state.errorMessage;
        if (typeof this.props.viewModeEnabled !== "undefined") {
          viewModeEnabled = this.props.viewModeEnabled;
        }

        if (typeof this.props.zenModeEnabled !== "undefined") {
          zenModeEnabled = this.props.zenModeEnabled;
        }

        if (typeof this.props.gridModeEnabled !== "undefined") {
          gridSize = this.props.gridModeEnabled ? GRID_SIZE : null;
        }

        if (typeof this.props.name !== "undefined") {
          name = this.props.name;
        }

        editingElement =
          editingElement || actionResult.appState?.editingElement || null;

        if (editingElement?.isDeleted) {
          editingElement = null;
        }

        this.setState(
          (state) => {
            // using Object.assign instead of spread to fool TS 4.2.2+ into
            // regarding the resulting type as not containing undefined
            // (which the following expression will never contain)
            return Object.assign(actionResult.appState || {}, {
              // NOTE this will prevent opening context menu using an action
              // or programmatically from the host, so it will need to be
              // rewritten later
              contextMenu: null,
              editingElement,
              viewModeEnabled,
              zenModeEnabled,
              gridSize,
              theme,
              name,
              errorMessage,
            });
          },
          () => {
            if (actionResult.syncHistory) {
              this.history.setCurrentState(
                this.state,
                this.scene.getElementsIncludingDeleted(),
              );
            }
          },
        );
      }
    },
  );

  // Lifecycle

  private onBlur = withBatchedUpdates(() => {
    isHoldingSpace = false;
    this.setState({ isBindingEnabled: true });
  });

  private onUnload = () => {
    this.onBlur();
  };

  private disableEvent: EventListener = (event) => {
    event.preventDefault();
  };

  private resetHistory = () => {
    this.history.clear();
  };

  /**
   * Resets scene & history.
   * ! Do not use to clear scene user action !
   */
  private resetScene = withBatchedUpdates(
    (opts?: { resetLoadingState: boolean }) => {
      this.scene.replaceAllElements([]);
      this.setState((state) => ({
        ...getDefaultAppState(),
        isLoading: opts?.resetLoadingState ? false : state.isLoading,
        theme: this.state.theme,
      }));
      this.resetHistory();
    },
  );

  private initializeScene = async () => {
    if ("launchQueue" in window && "LaunchParams" in window) {
      (window as any).launchQueue.setConsumer(
        async (launchParams: { files: any[] }) => {
          if (!launchParams.files.length) {
            return;
          }
          const fileHandle = launchParams.files[0];
          const blob: Blob = await fileHandle.getFile();
          this.loadFileToCanvas(
            new File([blob], blob.name || "", { type: blob.type }),
            fileHandle,
          );
        },
      );
    }

    if (this.props.theme) {
      this.setState({ theme: this.props.theme });
    }
    if (!this.state.isLoading) {
      this.setState({ isLoading: true });
    }
    let initialData = null;
    try {
      initialData = (await this.props.initialData) || null;
      if (initialData?.libraryItems) {
        this.library
          .updateLibrary({
            libraryItems: initialData.libraryItems,
            merge: true,
          })
          .catch((error) => {
            console.error(error);
          });
      }
    } catch (error: any) {
      console.error(error);
      initialData = {
        appState: {
          errorMessage:
            error.message ||
            "Encountered an error during importing or restoring scene data",
        },
      };
    }
    const scene = restore(initialData, null, null, { repairBindings: true });
    scene.appState = {
      ...scene.appState,
      theme: this.props.theme || scene.appState.theme,
      // we're falling back to current (pre-init) state when deciding
      // whether to open the library, to handle a case where we
      // update the state outside of initialData (e.g. when loading the app
      // with a library install link, which should auto-open the library)
      openSidebar: scene.appState?.openSidebar || this.state.openSidebar,
      activeTool:
        scene.appState.activeTool.type === "image"
          ? { ...scene.appState.activeTool, type: "selection" }
          : scene.appState.activeTool,
      isLoading: false,
      toast: this.state.toast,
    };
    if (initialData?.scrollToContent) {
      scene.appState = {
        ...scene.appState,
        ...calculateScrollCenter(scene.elements, {
          ...scene.appState,
          width: this.state.width,
          height: this.state.height,
          offsetTop: this.state.offsetTop,
          offsetLeft: this.state.offsetLeft,
        }),
      };
    }
    // FontFaceSet loadingdone event we listen on may not always fire
    // (looking at you Safari), so on init we manually load fonts for current
    // text elements on canvas, and rerender them once done. This also
    // seems faster even in browsers that do fire the loadingdone event.
    this.fonts.loadFontsForElements(scene.elements);

    this.resetHistory();
    this.syncActionResult({
      ...scene,
      commitToHistory: true,
    });

    if (initialData?.zoomToFit) {
      // defer to after loading all elements
      setTimeout(() => {
        this.actionManager.executeAction(actionZoomToFit);
      });
    }
  };

  private isMobileBreakpoint = (width: number, height: number) => {
    return (
      width < MQ_MAX_WIDTH_PORTRAIT ||
      (height < MQ_MAX_HEIGHT_LANDSCAPE && width < MQ_MAX_WIDTH_LANDSCAPE)
    );
  };

  private refreshViewportBreakpoints = () => {
    const container = this.excalidrawContainerRef.current;
    if (!container) {
      return;
    }

    const { clientWidth: viewportWidth, clientHeight: viewportHeight } =
      document.body;

    const prevViewportState = this.device.viewport;

    const nextViewportState = updateObject(prevViewportState, {
      isLandscape: viewportWidth > viewportHeight,
      isMobile: this.isMobileBreakpoint(viewportWidth, viewportHeight),
    });

    if (prevViewportState !== nextViewportState) {
      this.device = { ...this.device, viewport: nextViewportState };
      return true;
    }
    return false;
  };

  private refreshEditorBreakpoints = () => {
    const container = this.excalidrawContainerRef.current;
    if (!container) {
      return;
    }

    const { width: editorWidth, height: editorHeight } =
      container.getBoundingClientRect();

    const sidebarBreakpoint =
      this.props.UIOptions.dockedSidebarBreakpoint != null
        ? this.props.UIOptions.dockedSidebarBreakpoint
        : MQ_RIGHT_SIDEBAR_MIN_WIDTH;

    const prevEditorState = this.device.editor;

    const nextEditorState = updateObject(prevEditorState, {
      isMobile: this.isMobileBreakpoint(editorWidth, editorHeight),
      canFitSidebar: editorWidth > sidebarBreakpoint,
    });

    if (prevEditorState !== nextEditorState) {
      this.device = { ...this.device, editor: nextEditorState };
      return true;
    }
    return false;
  };

  public async componentDidMount() {
    this.unmounted = false;
    this.excalidrawContainerValue.container =
      this.excalidrawContainerRef.current;

    if (import.meta.env.MODE === ENV.TEST || import.meta.env.DEV) {
      const setState = this.setState.bind(this);
      Object.defineProperties(window.h, {
        state: {
          configurable: true,
          get: () => {
            return this.state;
          },
        },
        setState: {
          configurable: true,
          value: (...args: Parameters<typeof setState>) => {
            return this.setState(...args);
          },
        },
        app: {
          configurable: true,
          value: this,
        },
        history: {
          configurable: true,
          value: this.history,
        },
      });
    }

    this.scene.addCallback(this.onSceneUpdated);
    this.addEventListeners();

    if (this.props.autoFocus && this.excalidrawContainerRef.current) {
      this.focusContainer();
    }

    if (
      // bounding rects don't work in tests so updating
      // the state on init would result in making the test enviro run
      // in mobile breakpoint (0 width/height), making everything fail
      !isTestEnv()
    ) {
      this.refreshViewportBreakpoints();
      this.refreshEditorBreakpoints();
    }

    if (supportsResizeObserver && this.excalidrawContainerRef.current) {
      this.resizeObserver = new ResizeObserver(() => {
        this.refreshEditorBreakpoints();
        this.updateDOMRect();
      });
      this.resizeObserver?.observe(this.excalidrawContainerRef.current);
    }

    const searchParams = new URLSearchParams(window.location.search.slice(1));

    if (searchParams.has("web-share-target")) {
      // Obtain a file that was shared via the Web Share Target API.
      this.restoreFileFromShare();
    } else {
      this.updateDOMRect(this.initializeScene);
    }

    // note that this check seems to always pass in localhost
    if (isBrave() && !isMeasureTextSupported()) {
      this.setState({
        errorMessage: <BraveMeasureTextError />,
      });
    }
  }

  public componentWillUnmount() {
    this.renderer.destroy();
    this.scene = new Scene();
    this.renderer = new Renderer(this.scene);
    this.files = {};
    this.imageCache.clear();
    this.resizeObserver?.disconnect();
    this.unmounted = true;
    this.removeEventListeners();
    this.scene.destroy();
    this.library.destroy();
    this.laserPathManager.destroy();
    this.onChangeEmitter.destroy();
    ShapeCache.destroy();
    SnapCache.destroy();
    clearTimeout(touchTimeout);
    isSomeElementSelected.clearCache();
    selectGroupsForSelectedElements.clearCache();
    touchTimeout = 0;
  }

  private onResize = withBatchedUpdates(() => {
    this.scene
      .getElementsIncludingDeleted()
      .forEach((element) => ShapeCache.delete(element));
    this.refreshViewportBreakpoints();
    this.updateDOMRect();
    if (!supportsResizeObserver) {
      this.refreshEditorBreakpoints();
    }
    this.setState({});
  });

  private removeEventListeners() {
    document.removeEventListener(EVENT.POINTER_UP, this.removePointer);
    document.removeEventListener(EVENT.COPY, this.onCopy);
    document.removeEventListener(EVENT.PASTE, this.pasteFromClipboard);
    document.removeEventListener(EVENT.CUT, this.onCut);
    this.excalidrawContainerRef.current?.removeEventListener(
      EVENT.WHEEL,
      this.onWheel,
    );
    this.nearestScrollableContainer?.removeEventListener(
      EVENT.SCROLL,
      this.onScroll,
    );
    document.removeEventListener(EVENT.KEYDOWN, this.onKeyDown, false);
    document.removeEventListener(
      EVENT.MOUSE_MOVE,
      this.updateCurrentCursorPosition,
      false,
    );
    document.removeEventListener(EVENT.KEYUP, this.onKeyUp);
    window.removeEventListener(EVENT.RESIZE, this.onResize, false);
    window.removeEventListener(EVENT.UNLOAD, this.onUnload, false);
    window.removeEventListener(EVENT.BLUR, this.onBlur, false);
    this.excalidrawContainerRef.current?.removeEventListener(
      EVENT.DRAG_OVER,
      this.disableEvent,
      false,
    );
    this.excalidrawContainerRef.current?.removeEventListener(
      EVENT.DROP,
      this.disableEvent,
      false,
    );

    document.removeEventListener(
      EVENT.GESTURE_START,
      this.onGestureStart as any,
      false,
    );
    document.removeEventListener(
      EVENT.GESTURE_CHANGE,
      this.onGestureChange as any,
      false,
    );
    document.removeEventListener(
      EVENT.GESTURE_END,
      this.onGestureEnd as any,
      false,
    );

    window.removeEventListener(EVENT.MESSAGE, this.onWindowMessage, false);
  }

  private addEventListeners() {
    this.removeEventListeners();
    window.addEventListener(EVENT.MESSAGE, this.onWindowMessage, false);
    document.addEventListener(EVENT.POINTER_UP, this.removePointer); // #3553
    document.addEventListener(EVENT.COPY, this.onCopy);
    this.excalidrawContainerRef.current?.addEventListener(
      EVENT.WHEEL,
      this.onWheel,
      { passive: false },
    );

    if (this.props.handleKeyboardGlobally) {
      document.addEventListener(EVENT.KEYDOWN, this.onKeyDown, false);
    }
    document.addEventListener(EVENT.KEYUP, this.onKeyUp, { passive: true });
    document.addEventListener(
      EVENT.MOUSE_MOVE,
      this.updateCurrentCursorPosition,
    );
    // rerender text elements on font load to fix #637 && #1553
    document.fonts?.addEventListener?.("loadingdone", (event) => {
      const loadedFontFaces = (event as FontFaceSetLoadEvent).fontfaces;
      this.fonts.onFontsLoaded(loadedFontFaces);
    });

    // Safari-only desktop pinch zoom
    document.addEventListener(
      EVENT.GESTURE_START,
      this.onGestureStart as any,
      false,
    );
    document.addEventListener(
      EVENT.GESTURE_CHANGE,
      this.onGestureChange as any,
      false,
    );
    document.addEventListener(
      EVENT.GESTURE_END,
      this.onGestureEnd as any,
      false,
    );
    if (this.state.viewModeEnabled) {
      return;
    }

    document.addEventListener(EVENT.PASTE, this.pasteFromClipboard);
    document.addEventListener(EVENT.CUT, this.onCut);
    if (this.props.detectScroll) {
      this.nearestScrollableContainer = getNearestScrollableContainer(
        this.excalidrawContainerRef.current!,
      );
      this.nearestScrollableContainer.addEventListener(
        EVENT.SCROLL,
        this.onScroll,
      );
    }
    window.addEventListener(EVENT.RESIZE, this.onResize, false);
    window.addEventListener(EVENT.UNLOAD, this.onUnload, false);
    window.addEventListener(EVENT.BLUR, this.onBlur, false);
    this.excalidrawContainerRef.current?.addEventListener(
      EVENT.DRAG_OVER,
      this.disableEvent,
      false,
    );
    this.excalidrawContainerRef.current?.addEventListener(
      EVENT.DROP,
      this.disableEvent,
      false,
    );
  }

  componentDidUpdate(prevProps: AppProps, prevState: AppState) {
    this.updateEmbeddables();
    if (
      !this.state.showWelcomeScreen &&
      !this.scene.getElementsIncludingDeleted().length
    ) {
      this.setState({ showWelcomeScreen: true });
    }

    if (
      prevProps.UIOptions.dockedSidebarBreakpoint !==
      this.props.UIOptions.dockedSidebarBreakpoint
    ) {
      this.refreshEditorBreakpoints();
    }

    if (
      prevState.scrollX !== this.state.scrollX ||
      prevState.scrollY !== this.state.scrollY
    ) {
      this.props?.onScrollChange?.(this.state.scrollX, this.state.scrollY);
    }

    if (
      Object.keys(this.state.selectedElementIds).length &&
      isEraserActive(this.state)
    ) {
      this.setState({
        activeTool: updateActiveTool(this.state, { type: "selection" }),
      });
    }
    if (
      this.state.activeTool.type === "eraser" &&
      prevState.theme !== this.state.theme
    ) {
      setEraserCursor(this.interactiveCanvas, this.state.theme);
    }
    // Hide hyperlink popup if shown when element type is not selection
    if (
      prevState.activeTool.type === "selection" &&
      this.state.activeTool.type !== "selection" &&
      this.state.showHyperlinkPopup
    ) {
      this.setState({ showHyperlinkPopup: false });
    }
    if (prevProps.langCode !== this.props.langCode) {
      this.updateLanguage();
    }

    if (prevProps.viewModeEnabled !== this.props.viewModeEnabled) {
      this.setState({ viewModeEnabled: !!this.props.viewModeEnabled });
    }

    if (prevState.viewModeEnabled !== this.state.viewModeEnabled) {
      this.addEventListeners();
      this.deselectElements();
    }

    if (prevProps.zenModeEnabled !== this.props.zenModeEnabled) {
      this.setState({ zenModeEnabled: !!this.props.zenModeEnabled });
    }

    if (prevProps.theme !== this.props.theme && this.props.theme) {
      this.setState({ theme: this.props.theme });
    }

    if (prevProps.gridModeEnabled !== this.props.gridModeEnabled) {
      this.setState({
        gridSize: this.props.gridModeEnabled ? GRID_SIZE : null,
      });
    }

    if (this.props.name && prevProps.name !== this.props.name) {
      this.setState({
        name: this.props.name,
      });
    }

    this.excalidrawContainerRef.current?.classList.toggle(
      "theme--dark",
      this.state.theme === "dark",
    );

    if (
      this.state.editingLinearElement &&
      !this.state.selectedElementIds[this.state.editingLinearElement.elementId]
    ) {
      // defer so that the commitToHistory flag isn't reset via current update
      setTimeout(() => {
        // execute only if the condition still holds when the deferred callback
        // executes (it can be scheduled multiple times depending on how
        // many times the component renders)
        this.state.editingLinearElement &&
          this.actionManager.executeAction(actionFinalize);
      });
    }

    // failsafe in case the state is being updated in incorrect order resulting
    // in the editingElement being now a deleted element
    if (this.state.editingElement?.isDeleted) {
      this.setState({ editingElement: null });
    }

    if (
      this.state.selectedLinearElement &&
      !this.state.selectedElementIds[this.state.selectedLinearElement.elementId]
    ) {
      // To make sure `selectedLinearElement` is in sync with `selectedElementIds`, however this shouldn't be needed once
      // we have a single API to update `selectedElementIds`
      this.setState({ selectedLinearElement: null });
    }

    const { multiElement } = prevState;
    if (
      prevState.activeTool !== this.state.activeTool &&
      multiElement != null &&
      isBindingEnabled(this.state) &&
      isBindingElement(multiElement, false)
    ) {
      maybeBindLinearElement(
        multiElement,
        this.state,
        this.scene,
        tupleToCoors(
          LinearElementEditor.getPointAtIndexGlobalCoordinates(
            multiElement,
            -1,
          ),
        ),
      );
    }
    this.history.record(this.state, this.scene.getElementsIncludingDeleted());

    // Do not notify consumers if we're still loading the scene. Among other
    // potential issues, this fixes a case where the tab isn't focused during
    // init, which would trigger onChange with empty elements, which would then
    // override whatever is in localStorage currently.
    if (!this.state.isLoading) {
      this.props.onChange?.(
        this.scene.getElementsIncludingDeleted(),
        this.state,
        this.files,
      );
      this.onChangeEmitter.trigger(
        this.scene.getElementsIncludingDeleted(),
        this.state,
        this.files,
      );
    }
  }

  private renderInteractiveSceneCallback = ({
    atLeastOneVisibleElement,
    scrollBars,
    elements,
  }: RenderInteractiveSceneCallback) => {
    if (scrollBars) {
      currentScrollBars = scrollBars;
    }
    const scrolledOutside =
      // hide when editing text
      isTextElement(this.state.editingElement)
        ? false
        : !atLeastOneVisibleElement && elements.length > 0;
    if (this.state.scrolledOutside !== scrolledOutside) {
      this.setState({ scrolledOutside });
    }

    this.scheduleImageRefresh();
  };

  private onScroll = debounce(() => {
    const { offsetTop, offsetLeft } = this.getCanvasOffsets();
    this.setState((state) => {
      if (state.offsetLeft === offsetLeft && state.offsetTop === offsetTop) {
        return null;
      }
      return { offsetTop, offsetLeft };
    });
  }, SCROLL_TIMEOUT);

  // Copy/paste

  private onCut = withBatchedUpdates((event: ClipboardEvent) => {
    const isExcalidrawActive = this.excalidrawContainerRef.current?.contains(
      document.activeElement,
    );
    if (!isExcalidrawActive || isWritableElement(event.target)) {
      return;
    }
    this.actionManager.executeAction(actionCut, "keyboard", event);
    event.preventDefault();
    event.stopPropagation();
  });

  private onCopy = withBatchedUpdates((event: ClipboardEvent) => {
    const isExcalidrawActive = this.excalidrawContainerRef.current?.contains(
      document.activeElement,
    );
    if (!isExcalidrawActive || isWritableElement(event.target)) {
      return;
    }
    this.actionManager.executeAction(actionCopy, "keyboard", event);
    event.preventDefault();
    event.stopPropagation();
  });

  private static resetTapTwice() {
    didTapTwice = false;
  }

  private onTouchStart = (event: TouchEvent) => {
    // fix for Apple Pencil Scribble
    // On Android, preventing the event would disable contextMenu on tap-hold
    if (!isAndroid) {
      event.preventDefault();
    }

    if (!didTapTwice) {
      didTapTwice = true;
      clearTimeout(tappedTwiceTimer);
      tappedTwiceTimer = window.setTimeout(
        App.resetTapTwice,
        TAP_TWICE_TIMEOUT,
      );
      return;
    }
    // insert text only if we tapped twice with a single finger
    // event.touches.length === 1 will also prevent inserting text when user's zooming
    if (didTapTwice && event.touches.length === 1) {
      const touch = event.touches[0];
      // @ts-ignore
      this.handleCanvasDoubleClick({
        clientX: touch.clientX,
        clientY: touch.clientY,
      });
      didTapTwice = false;
      clearTimeout(tappedTwiceTimer);
    }
    if (isAndroid) {
      event.preventDefault();
    }

    if (event.touches.length === 2) {
      this.setState({
        selectedElementIds: makeNextSelectedElementIds({}, this.state),
        activeEmbeddable: null,
      });
    }
  };

  private onTouchEnd = (event: TouchEvent) => {
    this.resetContextMenuTimer();
    if (event.touches.length > 0) {
      this.setState({
        previousSelectedElementIds: {},
        selectedElementIds: makeNextSelectedElementIds(
          this.state.previousSelectedElementIds,
          this.state,
        ),
      });
    } else {
      gesture.pointers.clear();
    }
  };

  public pasteFromClipboard = withBatchedUpdates(
    async (event: ClipboardEvent) => {
      const isPlainPaste = !!IS_PLAIN_PASTE;

      // #686
      const target = document.activeElement;
      const isExcalidrawActive =
        this.excalidrawContainerRef.current?.contains(target);
      if (event && !isExcalidrawActive) {
        return;
      }

      // These two lines are moved up by Alkemio to avoid pasting images json as text inside text elements
      let file = event?.clipboardData?.files[0];
      const data = parseClipboard(event, isPlainPaste);

      const elementUnderCursor = document.elementFromPoint(
        this.lastViewportPosition.x,
        this.lastViewportPosition.y,
      );
      if (
        event &&
        (!(elementUnderCursor instanceof HTMLCanvasElement) ||
          isWritableElement(target)) &&
        !data.elements // If there are any elements, they will not be inserted as text
      ) {
        return;
      }

      const { x: sceneX, y: sceneY } = viewportCoordsToSceneCoords(
        {
          clientX: this.lastViewportPosition.x,
          clientY: this.lastViewportPosition.y,
        },
        this.state,
      );

      if (!file && !isPlainPaste) {
        if (data.mixedContent) {
          return this.addElementsFromMixedContentPaste(data.mixedContent, {
            isPlainPaste,
            sceneX,
            sceneY,
          });
        } else if (data.text) {
          const string = data.text.trim();
          if (string.startsWith("<svg") && string.endsWith("</svg>")) {
            // ignore SVG validation/normalization which will be done during image
            // initialization
            file = SVGStringToFile(string);
          }
        }
      }

      // prefer spreadsheet data over image file (MS Office/Libre Office)
      if (isSupportedImageFile(file) && !data.spreadsheet) {
        if (!this.isToolSupported("image")) {
          this.setState({ errorMessage: t("errors.imageToolNotSupported") });
          return;
        }

        const imageElement = this.createImageElement({ sceneX, sceneY });
        this.insertImageElement(imageElement, file);
        this.initializeImageDimensions(imageElement);
        this.setState({
          selectedElementIds: makeNextSelectedElementIds(
            {
              [imageElement.id]: true,
            },
            this.state,
          ),
        });

        return;
      }

      if (this.props.onPaste) {
        try {
          if ((await this.props.onPaste(data, event)) === false) {
            return;
          }
        } catch (error: any) {
          console.error(error);
        }
      }

      if (data.errorMessage) {
        this.setState({ errorMessage: data.errorMessage });
      } else if (data.spreadsheet && !isPlainPaste) {
        this.setState({
          pasteDialog: {
            data: data.spreadsheet,
            shown: true,
          },
        });
      } else if (data.elements) {
        const elements = (
          data.programmaticAPI
            ? convertToExcalidrawElements(
                data.elements as ExcalidrawElementSkeleton[],
              )
            : data.elements
        ) as readonly ExcalidrawElement[];
        // TODO remove formatting from elements if isPlainPaste
        this.addElementsFromPasteOrLibrary({
          elements,
          files: data.files || null,
          position: "cursor",
          retainSeed: isPlainPaste,
        });
      } else if (data.text) {
        const maybeUrl = extractSrc(data.text);

        if (
          !isPlainPaste &&
          embeddableURLValidator(maybeUrl, this.props.validateEmbeddable) &&
          (/^(http|https):\/\/[^\s/$.?#].[^\s]*$/.test(maybeUrl) ||
            getEmbedLink(maybeUrl)?.type === "video")
        ) {
          const embeddable = this.insertEmbeddableElement({
            sceneX,
            sceneY,
            link: normalizeLink(maybeUrl),
          });
          if (embeddable) {
            this.setState({ selectedElementIds: { [embeddable.id]: true } });
          }
          return;
        }
        this.addTextFromPaste(data.text, isPlainPaste);
      }
      this.setActiveTool({ type: "selection" });
      event?.preventDefault();
    },
  );

  addElementsFromPasteOrLibrary = (opts: {
    elements: readonly ExcalidrawElement[];
    files: BinaryFiles | null;
    position: { clientX: number; clientY: number } | "cursor" | "center";
    retainSeed?: boolean;
    fitToContent?: boolean;
  }) => {
    const elements = restoreElements(opts.elements, null, undefined);
    const [minX, minY, maxX, maxY] = getCommonBounds(elements);

    const elementsCenterX = distance(minX, maxX) / 2;
    const elementsCenterY = distance(minY, maxY) / 2;

    const clientX =
      typeof opts.position === "object"
        ? opts.position.clientX
        : opts.position === "cursor"
        ? this.lastViewportPosition.x
        : this.state.width / 2 + this.state.offsetLeft;
    const clientY =
      typeof opts.position === "object"
        ? opts.position.clientY
        : opts.position === "cursor"
        ? this.lastViewportPosition.y
        : this.state.height / 2 + this.state.offsetTop;

    const { x, y } = viewportCoordsToSceneCoords(
      { clientX, clientY },
      this.state,
    );

    const dx = x - elementsCenterX;
    const dy = y - elementsCenterY;

    const [gridX, gridY] = getGridPoint(dx, dy, this.state.gridSize);

    const newElements = duplicateElements(
      elements.map((element) => {
        return newElementWith(element, {
          x: element.x + gridX - minX,
          y: element.y + gridY - minY,
        });
      }),
      {
        randomizeSeed: !opts.retainSeed,
      },
    );

    const nextElements = [
      ...this.scene.getElementsIncludingDeleted(),
      ...newElements,
    ];

    this.scene.replaceAllElements(nextElements);

    newElements.forEach((newElement) => {
      if (isTextElement(newElement) && isBoundToContainer(newElement)) {
        const container = getContainerElement(newElement);
        redrawTextBoundingBox(newElement, container);
      }
    });

    if (opts.files) {
      this.files = { ...this.files, ...opts.files };
    }

    this.history.resumeRecording();

    const nextElementsToSelect =
      excludeElementsInFramesFromSelection(newElements);

    this.setState(
      {
        ...this.state,
        // keep sidebar (presumably the library) open if it's docked and
        // can fit.
        //
        // Note, we should close the sidebar only if we're dropping items
        // from library, not when pasting from clipboard. Alas.
        openSidebar:
          this.state.openSidebar &&
          this.device.editor.canFitSidebar &&
          jotaiStore.get(isSidebarDockedAtom)
            ? this.state.openSidebar
            : null,
        ...selectGroupsForSelectedElements(
          {
            editingGroupId: null,
            selectedElementIds: nextElementsToSelect.reduce(
              (acc: Record<ExcalidrawElement["id"], true>, element) => {
                if (!isBoundToContainer(element)) {
                  acc[element.id] = true;
                }
                return acc;
              },
              {},
            ),
          },
          this.scene.getNonDeletedElements(),
          this.state,
          this,
        ),
      },
      () => {
        if (opts.files) {
          this.addNewImagesToImageCache();
        }
      },
    );
    this.setActiveTool({ type: "selection" });

    if (opts.fitToContent) {
      this.scrollToContent(newElements, {
        fitToContent: true,
      });
    }
  };

  // TODO rewrite this to paste both text & images at the same time if
  // pasted data contains both
  private async addElementsFromMixedContentPaste(
    mixedContent: PastedMixedContent,
    {
      isPlainPaste,
      sceneX,
      sceneY,
    }: { isPlainPaste: boolean; sceneX: number; sceneY: number },
  ) {
    if (
      !isPlainPaste &&
      mixedContent.some((node) => node.type === "imageUrl") &&
      this.isToolSupported("image")
    ) {
      const imageURLs = mixedContent
        .filter((node) => node.type === "imageUrl")
        .map((node) => node.value);
      const responses = await Promise.all(
        imageURLs.map(async (url) => {
          try {
            return { file: await ImageURLToFile(url) };
          } catch (error: any) {
            return { errorMessage: error.message as string };
          }
        }),
      );
      let y = sceneY;
      let firstImageYOffsetDone = false;
      const nextSelectedIds: Record<ExcalidrawElement["id"], true> = {};
      for (const response of responses) {
        if (response.file) {
          const imageElement = this.createImageElement({
            sceneX,
            sceneY: y,
          });

          const initializedImageElement = await this.insertImageElement(
            imageElement,
            response.file,
          );
          if (initializedImageElement) {
            // vertically center first image in the batch
            if (!firstImageYOffsetDone) {
              firstImageYOffsetDone = true;
              y -= initializedImageElement.height / 2;
            }
            // hack to reset the `y` coord because we vertically center during
            // insertImageElement
            mutateElement(initializedImageElement, { y }, false);

            y = imageElement.y + imageElement.height + 25;

            nextSelectedIds[imageElement.id] = true;
          }
        }
      }

      this.setState({
        selectedElementIds: makeNextSelectedElementIds(
          nextSelectedIds,
          this.state,
        ),
      });

      const error = responses.find((response) => !!response.errorMessage);
      if (error && error.errorMessage) {
        this.setState({ errorMessage: error.errorMessage });
      }
    } else {
      const textNodes = mixedContent.filter((node) => node.type === "text");
      if (textNodes.length) {
        this.addTextFromPaste(
          textNodes.map((node) => node.value).join("\n\n"),
          isPlainPaste,
        );
      }
    }
  }

  private addTextFromPaste(text: string, isPlainPaste = false) {
    const { x, y } = viewportCoordsToSceneCoords(
      {
        clientX: this.lastViewportPosition.x,
        clientY: this.lastViewportPosition.y,
      },
      this.state,
    );

    const textElementProps = {
      x,
      y,
      strokeColor: this.state.currentItemStrokeColor,
      backgroundColor: this.state.currentItemBackgroundColor,
      fillStyle: this.state.currentItemFillStyle,
      strokeWidth: this.state.currentItemStrokeWidth,
      strokeStyle: this.state.currentItemStrokeStyle,
      roundness: null,
      roughness: this.state.currentItemRoughness,
      opacity: this.state.currentItemOpacity,
      text,
      fontSize: this.state.currentItemFontSize,
      fontFamily: this.state.currentItemFontFamily,
      textAlign: this.state.currentItemTextAlign,
      verticalAlign: DEFAULT_VERTICAL_ALIGN,
      locked: false,
    };

    const LINE_GAP = 10;
    let currentY = y;

    const lines = isPlainPaste ? [text] : text.split("\n");
    const textElements = lines.reduce(
      (acc: ExcalidrawTextElement[], line, idx) => {
        const text = line.trim();

        const lineHeight = getDefaultLineHeight(textElementProps.fontFamily);
        if (text.length) {
          const topLayerFrame = this.getTopLayerFrameAtSceneCoords({
            x,
            y: currentY,
          });

          const element = newTextElement({
            ...textElementProps,
            x,
            y: currentY,
            text,
            lineHeight,
            frameId: topLayerFrame ? topLayerFrame.id : null,
          });
          acc.push(element);
          currentY += element.height + LINE_GAP;
        } else {
          const prevLine = lines[idx - 1]?.trim();
          // add paragraph only if previous line was not empty, IOW don't add
          // more than one empty line
          if (prevLine) {
            currentY +=
              getLineHeightInPx(textElementProps.fontSize, lineHeight) +
              LINE_GAP;
          }
        }

        return acc;
      },
      [],
    );

    if (textElements.length === 0) {
      return;
    }

    const frameId = textElements[0].frameId;

    if (frameId) {
      this.scene.insertElementsAtIndex(
        textElements,
        this.scene.getElementIndex(frameId),
      );
    } else {
      this.scene.replaceAllElements([
        ...this.scene.getElementsIncludingDeleted(),
        ...textElements,
      ]);
    }

    this.setState({
      selectedElementIds: makeNextSelectedElementIds(
        Object.fromEntries(textElements.map((el) => [el.id, true])),
        this.state,
      ),
    });

    if (
      !isPlainPaste &&
      textElements.length > 1 &&
      PLAIN_PASTE_TOAST_SHOWN === false &&
      !this.device.editor.isMobile
    ) {
      this.setToast({
        message: t("toast.pasteAsSingleElement", {
          shortcut: getShortcutKey("CtrlOrCmd+Shift+V"),
        }),
        duration: 5000,
      });
      PLAIN_PASTE_TOAST_SHOWN = true;
    }

    this.history.resumeRecording();
  }

  setAppState: React.Component<any, AppState>["setState"] = (
    state,
    callback,
  ) => {
    this.setState(state, callback);
  };

  removePointer = (event: React.PointerEvent<HTMLElement> | PointerEvent) => {
    if (touchTimeout) {
      this.resetContextMenuTimer();
    }

    gesture.pointers.delete(event.pointerId);
  };

  toggleLock = (source: "keyboard" | "ui" = "ui") => {
    if (!this.state.activeTool.locked) {
      trackEvent(
        "toolbar",
        "toggleLock",
        `${source} (${this.device.editor.isMobile ? "mobile" : "desktop"})`,
      );
    }
    this.setState((prevState) => {
      return {
        activeTool: {
          ...prevState.activeTool,
          ...updateActiveTool(
            this.state,
            prevState.activeTool.locked
              ? { type: "selection" }
              : prevState.activeTool,
          ),
          locked: !prevState.activeTool.locked,
        },
      };
    });
  };

  updateFrameRendering = (
    opts:
      | Partial<AppState["frameRendering"]>
      | ((
          prevState: AppState["frameRendering"],
        ) => Partial<AppState["frameRendering"]>),
  ) => {
    this.setState((prevState) => {
      const next =
        typeof opts === "function" ? opts(prevState.frameRendering) : opts;
      return {
        frameRendering: {
          enabled: next?.enabled ?? prevState.frameRendering.enabled,
          clip: next?.clip ?? prevState.frameRendering.clip,
          name: next?.name ?? prevState.frameRendering.name,
          outline: next?.outline ?? prevState.frameRendering.outline,
        },
      };
    });
  };

  togglePenMode = (force: boolean | null) => {
    this.setState((prevState) => {
      return {
        penMode: force ?? !prevState.penMode,
        penDetected: true,
      };
    });
  };

  onHandToolToggle = () => {
    this.actionManager.executeAction(actionToggleHandTool);
  };

  /**
   * Zooms on canvas viewport center
   */
  zoomCanvas = (
    /** decimal fraction between 0.1 (10% zoom) and 30 (3000% zoom) */
    value: number,
  ) => {
    this.setState({
      ...getStateForZoom(
        {
          viewportX: this.state.width / 2 + this.state.offsetLeft,
          viewportY: this.state.height / 2 + this.state.offsetTop,
          nextZoom: getNormalizedZoom(value),
        },
        this.state,
      ),
    });
  };

  private cancelInProgresAnimation: (() => void) | null = null;

  scrollToContent = (
    target:
      | ExcalidrawElement
      | readonly ExcalidrawElement[] = this.scene.getNonDeletedElements(),
    opts?:
      | {
          fitToContent?: boolean;
          fitToViewport?: never;
          viewportZoomFactor?: never;
          animate?: boolean;
          duration?: number;
        }
      | {
          fitToContent?: never;
          fitToViewport?: boolean;
          /** when fitToViewport=true, how much screen should the content cover,
           * between 0.1 (10%) and 1 (100%)
           */
          viewportZoomFactor?: number;
          animate?: boolean;
          duration?: number;
        },
  ) => {
    this.cancelInProgresAnimation?.();

    // convert provided target into ExcalidrawElement[] if necessary
    const targetElements = Array.isArray(target) ? target : [target];

    let zoom = this.state.zoom;
    let scrollX = this.state.scrollX;
    let scrollY = this.state.scrollY;

    if (opts?.fitToContent || opts?.fitToViewport) {
      const { appState } = zoomToFit({
        targetElements,
        appState: this.state,
        fitToViewport: !!opts?.fitToViewport,
        viewportZoomFactor: opts?.viewportZoomFactor,
      });
      zoom = appState.zoom;
      scrollX = appState.scrollX;
      scrollY = appState.scrollY;
    } else {
      // compute only the viewport location, without any zoom adjustment
      const scroll = calculateScrollCenter(targetElements, this.state);
      scrollX = scroll.scrollX;
      scrollY = scroll.scrollY;
    }

    // when animating, we use RequestAnimationFrame to prevent the animation
    // from slowing down other processes
    if (opts?.animate) {
      const origScrollX = this.state.scrollX;
      const origScrollY = this.state.scrollY;
      const origZoom = this.state.zoom.value;

      const cancel = easeToValuesRAF({
        fromValues: {
          scrollX: origScrollX,
          scrollY: origScrollY,
          zoom: origZoom,
        },
        toValues: { scrollX, scrollY, zoom: zoom.value },
        interpolateValue: (from, to, progress, key) => {
          // for zoom, use different easing
          if (key === "zoom") {
            return from * Math.pow(to / from, easeOut(progress));
          }
          // handle using default
          return undefined;
        },
        onStep: ({ scrollX, scrollY, zoom }) => {
          this.setState({
            scrollX,
            scrollY,
            zoom: { value: zoom },
          });
        },
        onStart: () => {
          this.setState({ shouldCacheIgnoreZoom: true });
        },
        onEnd: () => {
          this.setState({ shouldCacheIgnoreZoom: false });
        },
        onCancel: () => {
          this.setState({ shouldCacheIgnoreZoom: false });
        },
        duration: opts?.duration ?? 500,
      });

      this.cancelInProgresAnimation = () => {
        cancel();
        this.cancelInProgresAnimation = null;
      };
    } else {
      this.setState({ scrollX, scrollY, zoom });
    }
  };

  zoomToFit = () => {
    this.actionManager.executeAction(actionZoomToFit);
  };

  /** use when changing scrollX/scrollY/zoom based on user interaction */
  private translateCanvas: React.Component<any, AppState>["setState"] = (
    state,
  ) => {
    this.cancelInProgresAnimation?.();
    this.setState(state);
  };

  setToast = (
    toast: {
      message: string;
      closable?: boolean;
      duration?: number;
    } | null,
  ) => {
    this.setState({ toast });
  };

  restoreFileFromShare = async () => {
    try {
      const webShareTargetCache = await caches.open("web-share-target");

      const response = await webShareTargetCache.match("shared-file");
      if (response) {
        const blob = await response.blob();
        const file = new File([blob], blob.name || "", { type: blob.type });
        this.loadFileToCanvas(file, null);
        await webShareTargetCache.delete("shared-file");
        window.history.replaceState(null, APP_NAME, window.location.pathname);
      }
    } catch (error: any) {
      this.setState({ errorMessage: error.message });
    }
  };

  /** adds supplied files to existing files in the appState */
  public addFiles: ExcalidrawImperativeAPI["addFiles"] = withBatchedUpdates(
    (files) => {
      const filesMap = files.reduce((acc, fileData) => {
        acc.set(fileData.id, fileData);
        return acc;
      }, new Map<FileId, BinaryFileData>());

      this.files = { ...this.files, ...Object.fromEntries(filesMap) };

      this.scene.getNonDeletedElements().forEach((element) => {
        if (
          isInitializedImageElement(element) &&
          filesMap.has(element.fileId)
        ) {
          this.imageCache.delete(element.fileId);
          ShapeCache.delete(element);
        }
      });
      this.scene.informMutation();

      this.addNewImagesToImageCache();
    },
  );

  public updateScene = withBatchedUpdates(
    <K extends keyof AppState>(sceneData: {
      elements?: SceneData["elements"];
      appState?: Pick<AppState, K> | null;
      collaborators?: SceneData["collaborators"];
      commitToHistory?: SceneData["commitToHistory"];
    }) => {
      if (sceneData.commitToHistory) {
        this.history.resumeRecording();
      }

      if (sceneData.appState) {
        this.setState(sceneData.appState);
      }

      if (sceneData.elements) {
        this.scene.replaceAllElements(sceneData.elements);
      }

      if (sceneData.collaborators) {
        this.setState({ collaborators: sceneData.collaborators });
      }
    },
  );

  private onSceneUpdated = () => {
    this.setState({});
  };

  /**
   * @returns whether the menu was toggled on or off
   */
  public toggleSidebar = ({
    name,
    tab,
    force,
  }: {
    name: SidebarName;
    tab?: SidebarTabName;
    force?: boolean;
  }): boolean => {
    let nextName;
    if (force === undefined) {
      nextName = this.state.openSidebar?.name === name ? null : name;
    } else {
      nextName = force ? name : null;
    }
    this.setState({ openSidebar: nextName ? { name: nextName, tab } : null });

    return !!nextName;
  };

  private updateCurrentCursorPosition = withBatchedUpdates(
    (event: MouseEvent) => {
      this.lastViewportPosition.x = event.clientX;
      this.lastViewportPosition.y = event.clientY;
    },
  );

  // Input handling
  private onKeyDown = withBatchedUpdates(
    (event: React.KeyboardEvent | KeyboardEvent) => {
      // normalize `event.key` when CapsLock is pressed #2372

      if (
        "Proxy" in window &&
        ((!event.shiftKey && /^[A-Z]$/.test(event.key)) ||
          (event.shiftKey && /^[a-z]$/.test(event.key)))
      ) {
        event = new Proxy(event, {
          get(ev: any, prop) {
            const value = ev[prop];
            if (typeof value === "function") {
              // fix for Proxies hijacking `this`
              return value.bind(ev);
            }
            return prop === "key"
              ? // CapsLock inverts capitalization based on ShiftKey, so invert
                // it back
                event.shiftKey
                ? ev.key.toUpperCase()
                : ev.key.toLowerCase()
              : value;
          },
        });
      }

      if (event[KEYS.CTRL_OR_CMD] && event.key.toLowerCase() === KEYS.V) {
        IS_PLAIN_PASTE = event.shiftKey;
        clearTimeout(IS_PLAIN_PASTE_TIMER);
        // reset (100ms to be safe that we it runs after the ensuing
        // paste event). Though, technically unnecessary to reset since we
        // (re)set the flag before each paste event.
        IS_PLAIN_PASTE_TIMER = window.setTimeout(() => {
          IS_PLAIN_PASTE = false;
        }, 100);
      }

      // prevent browser zoom in input fields
      if (event[KEYS.CTRL_OR_CMD] && isWritableElement(event.target)) {
        if (event.code === CODES.MINUS || event.code === CODES.EQUAL) {
          event.preventDefault();
          return;
        }
      }

      // bail if
      if (
        // inside an input
        (isWritableElement(event.target) &&
          // unless pressing escape (finalize action)
          event.key !== KEYS.ESCAPE) ||
        // or unless using arrows (to move between buttons)
        (isArrowKey(event.key) && isInputLike(event.target))
      ) {
        return;
      }

      if (event.key === KEYS.QUESTION_MARK) {
        this.setState({
          openDialog: "help",
        });
        return;
      } else if (
        event.key.toLowerCase() === KEYS.E &&
        event.shiftKey &&
        event[KEYS.CTRL_OR_CMD]
      ) {
        event.preventDefault();
        this.setState({ openDialog: "imageExport" });
        return;
      }

      if (event.key === KEYS.PAGE_UP || event.key === KEYS.PAGE_DOWN) {
        let offset =
          (event.shiftKey ? this.state.width : this.state.height) /
          this.state.zoom.value;
        if (event.key === KEYS.PAGE_DOWN) {
          offset = -offset;
        }
        if (event.shiftKey) {
          this.translateCanvas((state) => ({
            scrollX: state.scrollX + offset,
          }));
        } else {
          this.translateCanvas((state) => ({
            scrollY: state.scrollY + offset,
          }));
        }
      }

      if (this.actionManager.handleKeyDown(event)) {
        return;
      }

      if (this.state.viewModeEnabled) {
        return;
      }

      if (event[KEYS.CTRL_OR_CMD] && this.state.isBindingEnabled) {
        this.setState({ isBindingEnabled: false });
      }

      if (isArrowKey(event.key)) {
        const step =
          (this.state.gridSize &&
            (event.shiftKey
              ? ELEMENT_TRANSLATE_AMOUNT
              : this.state.gridSize)) ||
          (event.shiftKey
            ? ELEMENT_SHIFT_TRANSLATE_AMOUNT
            : ELEMENT_TRANSLATE_AMOUNT);

        let offsetX = 0;
        let offsetY = 0;

        if (event.key === KEYS.ARROW_LEFT) {
          offsetX = -step;
        } else if (event.key === KEYS.ARROW_RIGHT) {
          offsetX = step;
        } else if (event.key === KEYS.ARROW_UP) {
          offsetY = -step;
        } else if (event.key === KEYS.ARROW_DOWN) {
          offsetY = step;
        }

        const selectedElements = this.scene.getSelectedElements({
          selectedElementIds: this.state.selectedElementIds,
          includeBoundTextElement: true,
          includeElementsInFrames: true,
        });

        selectedElements.forEach((element) => {
          mutateElement(element, {
            x: element.x + offsetX,
            y: element.y + offsetY,
          });

          updateBoundElements(element, {
            simultaneouslyUpdated: selectedElements,
          });
        });

        this.maybeSuggestBindingForAll(selectedElements);

        event.preventDefault();
      } else if (event.key === KEYS.ENTER) {
        const selectedElements = this.scene.getSelectedElements(this.state);
        if (selectedElements.length === 1) {
          const selectedElement = selectedElements[0];
          if (event[KEYS.CTRL_OR_CMD]) {
            if (isLinearElement(selectedElement)) {
              if (
                !this.state.editingLinearElement ||
                this.state.editingLinearElement.elementId !==
                  selectedElements[0].id
              ) {
                this.history.resumeRecording();
                this.setState({
                  editingLinearElement: new LinearElementEditor(
                    selectedElement,
                    this.scene,
                  ),
                });
              }
            }
          } else if (
            isTextElement(selectedElement) ||
            isValidTextContainer(selectedElement)
          ) {
            let container;
            if (!isTextElement(selectedElement)) {
              container = selectedElement as ExcalidrawTextContainer;
            }
            const midPoint = getContainerCenter(selectedElement, this.state);
            const sceneX = midPoint.x;
            const sceneY = midPoint.y;
            this.startTextEditing({
              sceneX,
              sceneY,
              container,
            });
            event.preventDefault();
            return;
          } else if (isFrameElement(selectedElement)) {
            this.setState({
              editingFrame: selectedElement.id,
            });
          }
        }
      } else if (
        !event.ctrlKey &&
        !event.altKey &&
        !event.metaKey &&
        this.state.draggingElement === null
      ) {
        const shape = findShapeByKey(event.key);
        if (shape) {
          if (this.state.activeTool.type !== shape) {
            trackEvent(
              "toolbar",
              shape,
              `keyboard (${
                this.device.editor.isMobile ? "mobile" : "desktop"
              })`,
            );
          }
          this.setActiveTool({ type: shape });
          event.stopPropagation();
        } else if (event.key === KEYS.Q) {
          this.toggleLock("keyboard");
          event.stopPropagation();
        }
      }
      if (event.key === KEYS.SPACE && gesture.pointers.size === 0) {
        isHoldingSpace = true;
        setCursor(this.interactiveCanvas, CURSOR_TYPE.GRAB);
        event.preventDefault();
      }

      if (
        (event.key === KEYS.G || event.key === KEYS.S) &&
        !event.altKey &&
        !event[KEYS.CTRL_OR_CMD]
      ) {
        const selectedElements = this.scene.getSelectedElements(this.state);
        if (
          this.state.activeTool.type === "selection" &&
          !selectedElements.length
        ) {
          return;
        }

        if (
          event.key === KEYS.G &&
          (hasBackground(this.state.activeTool.type) ||
            selectedElements.some((element) => hasBackground(element.type)))
        ) {
          this.setState({ openPopup: "elementBackground" });
          event.stopPropagation();
        }
        if (event.key === KEYS.S) {
          this.setState({ openPopup: "elementStroke" });
          event.stopPropagation();
        }
      }

      if (event.key === KEYS.K && !event.altKey && !event[KEYS.CTRL_OR_CMD]) {
        if (this.state.activeTool.type === "laser") {
          this.setActiveTool({ type: "selection" });
        } else {
          this.setActiveTool({ type: "laser" });
        }
        return;
      }

      if (
        event[KEYS.CTRL_OR_CMD] &&
        (event.key === KEYS.BACKSPACE || event.key === KEYS.DELETE)
      ) {
        jotaiStore.set(activeConfirmDialogAtom, "clearCanvas");
      }

      // eye dropper
      // -----------------------------------------------------------------------
      const lowerCased = event.key.toLocaleLowerCase();
      const isPickingStroke = lowerCased === KEYS.S && event.shiftKey;
      const isPickingBackground =
        event.key === KEYS.I || (lowerCased === KEYS.G && event.shiftKey);

      if (isPickingStroke || isPickingBackground) {
        this.openEyeDropper({
          type: isPickingStroke ? "stroke" : "background",
        });
      }
      // -----------------------------------------------------------------------
    },
  );

  private onWheel = withBatchedUpdates((event: WheelEvent) => {
    // prevent browser pinch zoom on DOM elements
    if (!(event.target instanceof HTMLCanvasElement) && event.ctrlKey) {
      event.preventDefault();
    }
  });

  private onKeyUp = withBatchedUpdates((event: KeyboardEvent) => {
    if (event.key === KEYS.SPACE) {
      if (this.state.viewModeEnabled) {
        setCursor(this.interactiveCanvas, CURSOR_TYPE.GRAB);
      } else if (this.state.activeTool.type === "selection") {
        resetCursor(this.interactiveCanvas);
      } else {
        setCursorForShape(this.interactiveCanvas, this.state);
        this.setState({
          selectedElementIds: makeNextSelectedElementIds({}, this.state),
          selectedGroupIds: {},
          editingGroupId: null,
          activeEmbeddable: null,
        });
      }
      isHoldingSpace = false;
    }
    if (!event[KEYS.CTRL_OR_CMD] && !this.state.isBindingEnabled) {
      this.setState({ isBindingEnabled: true });
    }
    if (isArrowKey(event.key)) {
      const selectedElements = this.scene.getSelectedElements(this.state);
      isBindingEnabled(this.state)
        ? bindOrUnbindSelectedElements(selectedElements)
        : unbindLinearElements(selectedElements);
      this.setState({ suggestedBindings: [] });
    }
  });

  // We purposely widen the `tool` type so this helper can be called with
  // any tool without having to type check it
  private isToolSupported = <T extends ToolType | "custom">(tool: T) => {
    return (
      this.props.UIOptions.tools?.[
        tool as Extract<T, keyof AppProps["UIOptions"]["tools"]>
      ] !== false
    );
  };

  setActiveTool = (
    tool: (
      | (
          | { type: Exclude<ToolType, "image"> }
          | {
              type: Extract<ToolType, "image">;
              insertOnCanvasDirectly?: boolean;
            }
        )
      | { type: "custom"; customType: string }
    ) & { locked?: boolean },
  ) => {
    if (!this.isToolSupported(tool.type)) {
      console.warn(
        `"${tool.type}" tool is disabled via "UIOptions.canvasActions.tools.${tool.type}"`,
      );
      return;
    }

    const nextActiveTool = updateActiveTool(this.state, tool);
    if (nextActiveTool.type === "hand") {
      setCursor(this.interactiveCanvas, CURSOR_TYPE.GRAB);
    } else if (!isHoldingSpace) {
      setCursorForShape(this.interactiveCanvas, this.state);
    }
    if (isToolIcon(document.activeElement)) {
      this.focusContainer();
    }
    if (!isLinearElementType(nextActiveTool.type)) {
      this.setState({ suggestedBindings: [] });
    }
    if (nextActiveTool.type === "image") {
      this.onImageAction({
        insertOnCanvasDirectly:
          (tool.type === "image" && tool.insertOnCanvasDirectly) ?? false,
      });
    }

    this.setState((prevState) => {
      const commonResets = {
        snapLines: prevState.snapLines.length ? [] : prevState.snapLines,
        originSnapOffset: null,
        activeEmbeddable: null,
      } as const;
      if (nextActiveTool.type !== "selection") {
        return {
          ...prevState,
          activeTool: nextActiveTool,
          selectedElementIds: makeNextSelectedElementIds({}, prevState),
          selectedGroupIds: makeNextSelectedElementIds({}, prevState),
          editingGroupId: null,
          multiElement: null,
          ...commonResets,
        };
      }
      return {
        ...prevState,
        activeTool: nextActiveTool,
        ...commonResets,
      };
    });
  };

  setOpenDialog = (dialogType: AppState["openDialog"]) => {
    this.setState({ openDialog: dialogType });
  };

  private setCursor = (cursor: string) => {
    setCursor(this.interactiveCanvas, cursor);
  };

  private resetCursor = () => {
    resetCursor(this.interactiveCanvas);
  };
  /**
   * returns whether user is making a gesture with >= 2 fingers (points)
   * on o touch screen (not on a trackpad). Currently only relates to Darwin
   * (iOS/iPadOS,MacOS), but may work on other devices in the future if
   * GestureEvent is standardized.
   */
  private isTouchScreenMultiTouchGesture = () => {
    // we don't want to deselect when using trackpad, and multi-point gestures
    // only work on touch screens, so checking for >= pointers means we're on a
    // touchscreen
    return gesture.pointers.size >= 2;
  };

  // fires only on Safari
  private onGestureStart = withBatchedUpdates((event: GestureEvent) => {
    event.preventDefault();

    // we only want to deselect on touch screens because user may have selected
    // elements by mistake while zooming
    if (this.isTouchScreenMultiTouchGesture()) {
      this.setState({
        selectedElementIds: makeNextSelectedElementIds({}, this.state),
        activeEmbeddable: null,
      });
    }
    gesture.initialScale = this.state.zoom.value;
  });

  // fires only on Safari
  private onGestureChange = withBatchedUpdates((event: GestureEvent) => {
    event.preventDefault();

    // onGestureChange only has zoom factor but not the center.
    // If we're on iPad or iPhone, then we recognize multi-touch and will
    // zoom in at the right location in the touchmove handler
    // (handleCanvasPointerMove).
    //
    // On Macbook trackpad, we don't have those events so will zoom in at the
    // current location instead.
    //
    // As such, bail from this handler on touch devices.
    if (this.isTouchScreenMultiTouchGesture()) {
      return;
    }

    const initialScale = gesture.initialScale;
    if (initialScale) {
      this.setState((state) => ({
        ...getStateForZoom(
          {
            viewportX: this.lastViewportPosition.x,
            viewportY: this.lastViewportPosition.y,
            nextZoom: getNormalizedZoom(initialScale * event.scale),
          },
          state,
        ),
      }));
    }
  });

  // fires only on Safari
  private onGestureEnd = withBatchedUpdates((event: GestureEvent) => {
    event.preventDefault();
    // reselect elements only on touch screens (see onGestureStart)
    if (this.isTouchScreenMultiTouchGesture()) {
      this.setState({
        previousSelectedElementIds: {},
        selectedElementIds: makeNextSelectedElementIds(
          this.state.previousSelectedElementIds,
          this.state,
        ),
      });
    }
    gesture.initialScale = null;
  });

  private handleTextWysiwyg(
    element: ExcalidrawTextElement,
    {
      isExistingElement = false,
    }: {
      isExistingElement?: boolean;
    },
  ) {
    const updateElement = (
      text: string,
      originalText: string,
      isDeleted: boolean,
    ) => {
      this.scene.replaceAllElements([
        ...this.scene.getElementsIncludingDeleted().map((_element) => {
          if (_element.id === element.id && isTextElement(_element)) {
            return updateTextElement(_element, {
              text,
              isDeleted,
              originalText,
            });
          }
          return _element;
        }),
      ]);
    };

    textWysiwyg({
      id: element.id,
      canvas: this.canvas,
      getViewportCoords: (x, y) => {
        const { x: viewportX, y: viewportY } = sceneCoordsToViewportCoords(
          {
            sceneX: x,
            sceneY: y,
          },
          this.state,
        );
        return [
          viewportX - this.state.offsetLeft,
          viewportY - this.state.offsetTop,
        ];
      },
      onChange: withBatchedUpdates((text) => {
        updateElement(text, text, false);
        if (isNonDeletedElement(element)) {
          updateBoundElements(element);
        }
      }),
      onSubmit: withBatchedUpdates(({ text, viaKeyboard, originalText }) => {
        const isDeleted = !text.trim();
        updateElement(text, originalText, isDeleted);
        // select the created text element only if submitting via keyboard
        // (when submitting via click it should act as signal to deselect)
        if (!isDeleted && viaKeyboard) {
          const elementIdToSelect = element.containerId
            ? element.containerId
            : element.id;
          this.setState((prevState) => ({
            selectedElementIds: makeNextSelectedElementIds(
              {
                ...prevState.selectedElementIds,
                [elementIdToSelect]: true,
              },
              prevState,
            ),
          }));
        }
        if (isDeleted) {
          fixBindingsAfterDeletion(this.scene.getNonDeletedElements(), [
            element,
          ]);
        }
        if (!isDeleted || isExistingElement) {
          this.history.resumeRecording();
        }

        this.setState({
          draggingElement: null,
          editingElement: null,
        });
        if (this.state.activeTool.locked) {
          setCursorForShape(this.interactiveCanvas, this.state);
        }

        this.focusContainer();
      }),
      element,
      excalidrawContainer: this.excalidrawContainerRef.current,
      app: this,
    });
    // deselect all other elements when inserting text
    this.deselectElements();

    // do an initial update to re-initialize element position since we were
    // modifying element's x/y for sake of editor (case: syncing to remote)
    updateElement(element.text, element.originalText, false);
  }

  private deselectElements() {
    this.setState({
      selectedElementIds: makeNextSelectedElementIds({}, this.state),
      selectedGroupIds: {},
      editingGroupId: null,
      activeEmbeddable: null,
    });
  }

  private getTextElementAtPosition(
    x: number,
    y: number,
  ): NonDeleted<ExcalidrawTextElement> | null {
    const element = this.getElementAtPosition(x, y, {
      includeBoundTextElement: true,
    });
    if (element && isTextElement(element) && !element.isDeleted) {
      return element;
    }
    return null;
  }

  private getElementAtPosition(
    x: number,
    y: number,
    opts?: {
      /** if true, returns the first selected element (with highest z-index)
        of all hit elements */
      preferSelected?: boolean;
      includeBoundTextElement?: boolean;
      includeLockedElements?: boolean;
    },
  ): NonDeleted<ExcalidrawElement> | null {
    const allHitElements = this.getElementsAtPosition(
      x,
      y,
      opts?.includeBoundTextElement,
      opts?.includeLockedElements,
    );
    if (allHitElements.length > 1) {
      if (opts?.preferSelected) {
        for (let index = allHitElements.length - 1; index > -1; index--) {
          if (this.state.selectedElementIds[allHitElements[index].id]) {
            return allHitElements[index];
          }
        }
      }
      const elementWithHighestZIndex =
        allHitElements[allHitElements.length - 1];
      // If we're hitting element with highest z-index only on its bounding box
      // while also hitting other element figure, the latter should be considered.
      return isHittingElementBoundingBoxWithoutHittingElement(
        elementWithHighestZIndex,
        this.state,
        this.frameNameBoundsCache,
        x,
        y,
      )
        ? allHitElements[allHitElements.length - 2]
        : elementWithHighestZIndex;
    }
    if (allHitElements.length === 1) {
      return allHitElements[0];
    }
    return null;
  }

  private getElementsAtPosition(
    x: number,
    y: number,
    includeBoundTextElement: boolean = false,
    includeLockedElements: boolean = false,
  ): NonDeleted<ExcalidrawElement>[] {
    const elements =
      includeBoundTextElement && includeLockedElements
        ? this.scene.getNonDeletedElements()
        : this.scene
            .getNonDeletedElements()
            .filter(
              (element) =>
                (includeLockedElements || !element.locked) &&
                (includeBoundTextElement ||
                  !(isTextElement(element) && element.containerId)),
            );

    return getElementsAtPosition(elements, (element) =>
      hitTest(element, this.state, this.frameNameBoundsCache, x, y),
    ).filter((element) => {
      // hitting a frame's element from outside the frame is not considered a hit
      const containingFrame = getContainingFrame(element);
      return containingFrame &&
        this.state.frameRendering.enabled &&
        this.state.frameRendering.clip
        ? isCursorInFrame({ x, y }, containingFrame)
        : true;
    });
  }

  private startTextEditing = ({
    sceneX,
    sceneY,
    insertAtParentCenter = true,
    container,
  }: {
    /** X position to insert text at */
    sceneX: number;
    /** Y position to insert text at */
    sceneY: number;
    /** whether to attempt to insert at element center if applicable */
    insertAtParentCenter?: boolean;
    container?: ExcalidrawTextContainer | null;
  }) => {
    let shouldBindToContainer = false;

    let parentCenterPosition =
      insertAtParentCenter &&
      this.getTextWysiwygSnappedToCenterPosition(
        sceneX,
        sceneY,
        this.state,
        container,
      );
    if (container && parentCenterPosition) {
      const boundTextElementToContainer = getBoundTextElement(container);
      if (!boundTextElementToContainer) {
        shouldBindToContainer = true;
      }
    }
    let existingTextElement: NonDeleted<ExcalidrawTextElement> | null = null;

    const selectedElements = this.scene.getSelectedElements(this.state);

    if (selectedElements.length === 1) {
      if (isTextElement(selectedElements[0])) {
        existingTextElement = selectedElements[0];
      } else if (container) {
        existingTextElement = getBoundTextElement(selectedElements[0]);
      } else {
        existingTextElement = this.getTextElementAtPosition(sceneX, sceneY);
      }
    } else {
      existingTextElement = this.getTextElementAtPosition(sceneX, sceneY);
    }

    const fontFamily =
      existingTextElement?.fontFamily || this.state.currentItemFontFamily;

    const lineHeight =
      existingTextElement?.lineHeight || getDefaultLineHeight(fontFamily);
    const fontSize = this.state.currentItemFontSize;

    if (
      !existingTextElement &&
      shouldBindToContainer &&
      container &&
      !isArrowElement(container)
    ) {
      const fontString = {
        fontSize,
        fontFamily,
      };
      const minWidth = getApproxMinLineWidth(
        getFontString(fontString),
        lineHeight,
      );
      const minHeight = getApproxMinLineHeight(fontSize, lineHeight);
      const newHeight = Math.max(container.height, minHeight);
      const newWidth = Math.max(container.width, minWidth);
      mutateElement(container, { height: newHeight, width: newWidth });
      sceneX = container.x + newWidth / 2;
      sceneY = container.y + newHeight / 2;
      if (parentCenterPosition) {
        parentCenterPosition = this.getTextWysiwygSnappedToCenterPosition(
          sceneX,
          sceneY,
          this.state,
          container,
        );
      }
    }

    const topLayerFrame = this.getTopLayerFrameAtSceneCoords({
      x: sceneX,
      y: sceneY,
    });

    const element = existingTextElement
      ? existingTextElement
      : newTextElement({
          x: parentCenterPosition
            ? parentCenterPosition.elementCenterX
            : sceneX,
          y: parentCenterPosition
            ? parentCenterPosition.elementCenterY
            : sceneY,
          strokeColor: this.state.currentItemStrokeColor,
          backgroundColor: this.state.currentItemBackgroundColor,
          fillStyle: this.state.currentItemFillStyle,
          strokeWidth: this.state.currentItemStrokeWidth,
          strokeStyle: this.state.currentItemStrokeStyle,
          roughness: this.state.currentItemRoughness,
          opacity: this.state.currentItemOpacity,
          text: "",
          fontSize,
          fontFamily,
          textAlign: parentCenterPosition
            ? "center"
            : this.state.currentItemTextAlign,
          verticalAlign: parentCenterPosition
            ? VERTICAL_ALIGN.MIDDLE
            : DEFAULT_VERTICAL_ALIGN,
          containerId: shouldBindToContainer ? container?.id : undefined,
          groupIds: container?.groupIds ?? [],
          lineHeight,
          angle: container?.angle ?? 0,
          frameId: topLayerFrame ? topLayerFrame.id : null,
        });

    if (!existingTextElement && shouldBindToContainer && container) {
      mutateElement(container, {
        boundElements: (container.boundElements || []).concat({
          type: "text",
          id: element.id,
        }),
      });
    }
    this.setState({ editingElement: element });

    if (!existingTextElement) {
      if (container && shouldBindToContainer) {
        const containerIndex = this.scene.getElementIndex(container.id);
        this.scene.insertElementAtIndex(element, containerIndex + 1);
      } else {
        this.scene.addNewElement(element);
      }
    }

    this.setState({
      editingElement: element,
    });

    this.handleTextWysiwyg(element, {
      isExistingElement: !!existingTextElement,
    });
  };

  private handleCanvasDoubleClick = (
    event: React.MouseEvent<HTMLCanvasElement>,
  ) => {
    // case: double-clicking with arrow/line tool selected would both create
    // text and enter multiElement mode
    if (this.state.multiElement) {
      return;
    }
    // we should only be able to double click when mode is selection
    if (this.state.activeTool.type !== "selection") {
      return;
    }

    const selectedElements = this.scene.getSelectedElements(this.state);

    if (selectedElements.length === 1 && isLinearElement(selectedElements[0])) {
      if (
        event[KEYS.CTRL_OR_CMD] &&
        (!this.state.editingLinearElement ||
          this.state.editingLinearElement.elementId !== selectedElements[0].id)
      ) {
        this.history.resumeRecording();
        this.setState({
          editingLinearElement: new LinearElementEditor(
            selectedElements[0],
            this.scene,
          ),
        });
        return;
      } else if (
        this.state.editingLinearElement &&
        this.state.editingLinearElement.elementId === selectedElements[0].id
      ) {
        return;
      }
    }

    resetCursor(this.interactiveCanvas);

    let { x: sceneX, y: sceneY } = viewportCoordsToSceneCoords(
      event,
      this.state,
    );

    const selectedGroupIds = getSelectedGroupIds(this.state);

    if (selectedGroupIds.length > 0) {
      const hitElement = this.getElementAtPosition(sceneX, sceneY);

      const selectedGroupId =
        hitElement &&
        getSelectedGroupIdForElement(hitElement, this.state.selectedGroupIds);

      if (selectedGroupId) {
        this.setState((prevState) => ({
          ...prevState,
          ...selectGroupsForSelectedElements(
            {
              editingGroupId: selectedGroupId,
              selectedElementIds: { [hitElement!.id]: true },
            },
            this.scene.getNonDeletedElements(),
            prevState,
            this,
          ),
        }));
        return;
      }
    }

    resetCursor(this.interactiveCanvas);
    if (!event[KEYS.CTRL_OR_CMD] && !this.state.viewModeEnabled) {
      const hitElement = this.getElementAtPosition(sceneX, sceneY);

      if (isEmbeddableElement(hitElement)) {
        this.setState({
          activeEmbeddable: { element: hitElement, state: "active" },
        });
        return;
      }

      const container = getTextBindableContainerAtPosition(
        this.scene.getNonDeletedElements(),
        this.state,
        sceneX,
        sceneY,
      );

      if (container) {
        if (
          hasBoundTextElement(container) ||
          !isTransparent(container.backgroundColor) ||
          isHittingElementNotConsideringBoundingBox(
            container,
            this.state,
            this.frameNameBoundsCache,
            [sceneX, sceneY],
          )
        ) {
          const midPoint = getContainerCenter(container, this.state);

          sceneX = midPoint.x;
          sceneY = midPoint.y;
        }
      }

      this.startTextEditing({
        sceneX,
        sceneY,
        insertAtParentCenter: !event.altKey,
        container,
      });
    }
  };

  private getElementLinkAtPosition = (
    scenePointer: Readonly<{ x: number; y: number }>,
    hitElement: NonDeletedExcalidrawElement | null,
  ): ExcalidrawElement | undefined => {
    // Reversing so we traverse the elements in decreasing order
    // of z-index
    const elements = this.scene.getNonDeletedElements().slice().reverse();
    let hitElementIndex = Infinity;

    return elements.find((element, index) => {
      if (hitElement && element.id === hitElement.id) {
        hitElementIndex = index;
      }
      return (
        element.link &&
        index <= hitElementIndex &&
        isPointHittingLink(
          element,
          this.state,
          [scenePointer.x, scenePointer.y],
          this.device.editor.isMobile,
        )
      );
    });
  };

  private redirectToLink = (
    event: React.PointerEvent<HTMLCanvasElement>,
    isTouchScreen: boolean,
  ) => {
    const draggedDistance = distance2d(
      this.lastPointerDownEvent!.clientX,
      this.lastPointerDownEvent!.clientY,
      this.lastPointerUpEvent!.clientX,
      this.lastPointerUpEvent!.clientY,
    );
    if (
      !this.hitLinkElement ||
      // For touch screen allow dragging threshold else strict check
      (isTouchScreen && draggedDistance > DRAGGING_THRESHOLD) ||
      (!isTouchScreen && draggedDistance !== 0)
    ) {
      return;
    }
    const lastPointerDownCoords = viewportCoordsToSceneCoords(
      this.lastPointerDownEvent!,
      this.state,
    );
    const lastPointerDownHittingLinkIcon = isPointHittingLink(
      this.hitLinkElement,
      this.state,
      [lastPointerDownCoords.x, lastPointerDownCoords.y],
      this.device.editor.isMobile,
    );
    const lastPointerUpCoords = viewportCoordsToSceneCoords(
      this.lastPointerUpEvent!,
      this.state,
    );
    const lastPointerUpHittingLinkIcon = isPointHittingLink(
      this.hitLinkElement,
      this.state,
      [lastPointerUpCoords.x, lastPointerUpCoords.y],
      this.device.editor.isMobile,
    );
    if (lastPointerDownHittingLinkIcon && lastPointerUpHittingLinkIcon) {
      let url = this.hitLinkElement.link;
      if (url) {
        url = normalizeLink(url);
        let customEvent;
        if (this.props.onLinkOpen) {
          customEvent = wrapEvent(EVENT.EXCALIDRAW_LINK, event.nativeEvent);
          this.props.onLinkOpen(
            {
              ...this.hitLinkElement,
              link: url,
            },
            customEvent,
          );
        }
        if (!customEvent?.defaultPrevented) {
          const target = isLocalLink(url) ? "_self" : "_blank";
          const newWindow = window.open(undefined, target);
          // https://mathiasbynens.github.io/rel-noopener/
          if (newWindow) {
            newWindow.opener = null;
            newWindow.location = url;
          }
        }
      }
    }
  };

  private getTopLayerFrameAtSceneCoords = (sceneCoords: {
    x: number;
    y: number;
  }) => {
    const frames = this.scene
      .getNonDeletedFrames()
      .filter((frame) =>
        isCursorInFrame(sceneCoords, frame as ExcalidrawFrameElement),
      );

    return frames.length ? frames[frames.length - 1] : null;
  };

  private handleCanvasPointerMove = (
    event: React.PointerEvent<HTMLCanvasElement>,
  ) => {
    this.savePointer(event.clientX, event.clientY, this.state.cursorButton);

    if (gesture.pointers.has(event.pointerId)) {
      gesture.pointers.set(event.pointerId, {
        x: event.clientX,
        y: event.clientY,
      });
    }

    const initialScale = gesture.initialScale;
    if (
      gesture.pointers.size === 2 &&
      gesture.lastCenter &&
      initialScale &&
      gesture.initialDistance
    ) {
      const center = getCenter(gesture.pointers);
      const deltaX = center.x - gesture.lastCenter.x;
      const deltaY = center.y - gesture.lastCenter.y;
      gesture.lastCenter = center;

      const distance = getDistance(Array.from(gesture.pointers.values()));
      const scaleFactor =
        this.state.activeTool.type === "freedraw" && this.state.penMode
          ? 1
          : distance / gesture.initialDistance;

      const nextZoom = scaleFactor
        ? getNormalizedZoom(initialScale * scaleFactor)
        : this.state.zoom.value;

      this.setState((state) => {
        const zoomState = getStateForZoom(
          {
            viewportX: center.x,
            viewportY: center.y,
            nextZoom,
          },
          state,
        );

        this.translateCanvas({
          zoom: zoomState.zoom,
          scrollX: zoomState.scrollX + deltaX / nextZoom,
          scrollY: zoomState.scrollY + deltaY / nextZoom,
          shouldCacheIgnoreZoom: true,
        });
      });
      this.resetShouldCacheIgnoreZoomDebounced();
    } else {
      gesture.lastCenter =
        gesture.initialDistance =
        gesture.initialScale =
          null;
    }

    if (
      isHoldingSpace ||
      isPanning ||
      isDraggingScrollBar ||
      isHandToolActive(this.state)
    ) {
      return;
    }

    const isPointerOverScrollBars = isOverScrollBars(
      currentScrollBars,
      event.clientX - this.state.offsetLeft,
      event.clientY - this.state.offsetTop,
    );
    const isOverScrollBar = isPointerOverScrollBars.isOverEither;
    if (!this.state.draggingElement && !this.state.multiElement) {
      if (isOverScrollBar) {
        resetCursor(this.interactiveCanvas);
      } else {
        setCursorForShape(this.interactiveCanvas, this.state);
      }
    }

    const scenePointer = viewportCoordsToSceneCoords(event, this.state);
    const { x: scenePointerX, y: scenePointerY } = scenePointer;

    if (
      !this.state.draggingElement &&
      isActiveToolNonLinearSnappable(this.state.activeTool.type)
    ) {
      const { originOffset, snapLines } = getSnapLinesAtPointer(
        this.scene.getNonDeletedElements(),
        this.state,
        {
          x: scenePointerX,
          y: scenePointerY,
        },
        event,
      );

      this.setState({
        snapLines,
        originSnapOffset: originOffset,
      });
    } else if (!this.state.draggingElement) {
      this.setState({
        snapLines: [],
      });
    }

    if (
      this.state.editingLinearElement &&
      !this.state.editingLinearElement.isDragging
    ) {
      const editingLinearElement = LinearElementEditor.handlePointerMove(
        event,
        scenePointerX,
        scenePointerY,
        this.state,
      );

      if (
        editingLinearElement &&
        editingLinearElement !== this.state.editingLinearElement
      ) {
        // Since we are reading from previous state which is not possible with
        // automatic batching in React 18 hence using flush sync to synchronously
        // update the state. Check https://github.com/excalidraw/excalidraw/pull/5508 for more details.
        flushSync(() => {
          this.setState({
            editingLinearElement,
          });
        });
      }
      if (editingLinearElement?.lastUncommittedPoint != null) {
        this.maybeSuggestBindingAtCursor(scenePointer);
      } else {
        // causes stack overflow if not sync
        flushSync(() => {
          this.setState({ suggestedBindings: [] });
        });
      }
    }

    if (isBindingElementType(this.state.activeTool.type)) {
      // Hovering with a selected tool or creating new linear element via click
      // and point
      const { draggingElement } = this.state;
      if (isBindingElement(draggingElement, false)) {
        this.maybeSuggestBindingsForLinearElementAtCoords(
          draggingElement,
          [scenePointer],
          this.state.startBoundElement,
        );
      } else {
        this.maybeSuggestBindingAtCursor(scenePointer);
      }
    }

    if (this.state.multiElement) {
      const { multiElement } = this.state;
      const { x: rx, y: ry } = multiElement;

      const { points, lastCommittedPoint } = multiElement;
      const lastPoint = points[points.length - 1];

      setCursorForShape(this.interactiveCanvas, this.state);

      if (lastPoint === lastCommittedPoint) {
        // if we haven't yet created a temp point and we're beyond commit-zone
        // threshold, add a point
        if (
          distance2d(
            scenePointerX - rx,
            scenePointerY - ry,
            lastPoint[0],
            lastPoint[1],
          ) >= LINE_CONFIRM_THRESHOLD
        ) {
          mutateElement(multiElement, {
            points: [...points, [scenePointerX - rx, scenePointerY - ry]],
          });
        } else {
          setCursor(this.interactiveCanvas, CURSOR_TYPE.POINTER);
          // in this branch, we're inside the commit zone, and no uncommitted
          // point exists. Thus do nothing (don't add/remove points).
        }
      } else if (
        points.length > 2 &&
        lastCommittedPoint &&
        distance2d(
          scenePointerX - rx,
          scenePointerY - ry,
          lastCommittedPoint[0],
          lastCommittedPoint[1],
        ) < LINE_CONFIRM_THRESHOLD
      ) {
        setCursor(this.interactiveCanvas, CURSOR_TYPE.POINTER);
        mutateElement(multiElement, {
          points: points.slice(0, -1),
        });
      } else {
        const [gridX, gridY] = getGridPoint(
          scenePointerX,
          scenePointerY,
          event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
        );

        const [lastCommittedX, lastCommittedY] =
          multiElement?.lastCommittedPoint ?? [0, 0];

        let dxFromLastCommitted = gridX - rx - lastCommittedX;
        let dyFromLastCommitted = gridY - ry - lastCommittedY;

        if (shouldRotateWithDiscreteAngle(event)) {
          ({ width: dxFromLastCommitted, height: dyFromLastCommitted } =
            getLockedLinearCursorAlignSize(
              // actual coordinate of the last committed point
              lastCommittedX + rx,
              lastCommittedY + ry,
              // cursor-grid coordinate
              gridX,
              gridY,
            ));
        }

        if (isPathALoop(points, this.state.zoom.value)) {
          setCursor(this.interactiveCanvas, CURSOR_TYPE.POINTER);
        }
        // update last uncommitted point
        mutateElement(multiElement, {
          points: [
            ...points.slice(0, -1),
            [
              lastCommittedX + dxFromLastCommitted,
              lastCommittedY + dyFromLastCommitted,
            ],
          ],
        });
      }

      return;
    }

    const hasDeselectedButton = Boolean(event.buttons);
    if (
      hasDeselectedButton ||
      (this.state.activeTool.type !== "selection" &&
        this.state.activeTool.type !== "text" &&
        this.state.activeTool.type !== "eraser")
    ) {
      return;
    }

    const elements = this.scene.getNonDeletedElements();

    const selectedElements = this.scene.getSelectedElements(this.state);
    if (
      selectedElements.length === 1 &&
      !isOverScrollBar &&
      !this.state.editingLinearElement
    ) {
      const elementWithTransformHandleType = getElementWithTransformHandleType(
        elements,
        this.state,
        scenePointerX,
        scenePointerY,
        this.state.zoom,
        event.pointerType,
      );
      if (
        elementWithTransformHandleType &&
        elementWithTransformHandleType.transformHandleType
      ) {
        setCursor(
          this.interactiveCanvas,
          getCursorForResizingElement(elementWithTransformHandleType),
        );
        return;
      }
    } else if (selectedElements.length > 1 && !isOverScrollBar) {
      const transformHandleType = getTransformHandleTypeFromCoords(
        getCommonBounds(selectedElements),
        scenePointerX,
        scenePointerY,
        this.state.zoom,
        event.pointerType,
      );
      if (transformHandleType) {
        setCursor(
          this.interactiveCanvas,
          getCursorForResizingElement({
            transformHandleType,
          }),
        );
        return;
      }
    }

    const hitElement = this.getElementAtPosition(
      scenePointer.x,
      scenePointer.y,
    );

    this.hitLinkElement = this.getElementLinkAtPosition(
      scenePointer,
      hitElement,
    );
    if (isEraserActive(this.state)) {
      return;
    }
    if (
      this.hitLinkElement &&
      !this.state.selectedElementIds[this.hitLinkElement.id]
    ) {
      setCursor(this.interactiveCanvas, CURSOR_TYPE.POINTER);
      showHyperlinkTooltip(this.hitLinkElement, this.state);
    } else {
      hideHyperlinkToolip();
      if (
        hitElement &&
        (hitElement.link || isEmbeddableElement(hitElement)) &&
        this.state.selectedElementIds[hitElement.id] &&
        !this.state.contextMenu &&
        !this.state.showHyperlinkPopup
      ) {
        this.setState({ showHyperlinkPopup: "info" });
      } else if (this.state.activeTool.type === "text") {
        setCursor(
          this.interactiveCanvas,
          isTextElement(hitElement) ? CURSOR_TYPE.TEXT : CURSOR_TYPE.CROSSHAIR,
        );
      } else if (this.state.viewModeEnabled) {
        setCursor(this.interactiveCanvas, CURSOR_TYPE.GRAB);
      } else if (isOverScrollBar) {
        setCursor(this.interactiveCanvas, CURSOR_TYPE.AUTO);
      } else if (this.state.selectedLinearElement) {
        this.handleHoverSelectedLinearElement(
          this.state.selectedLinearElement,
          scenePointerX,
          scenePointerY,
        );
      } else if (
        // if using cmd/ctrl, we're not dragging
        !event[KEYS.CTRL_OR_CMD]
      ) {
        if (
          (hitElement ||
            this.isHittingCommonBoundingBoxOfSelectedElements(
              scenePointer,
              selectedElements,
            )) &&
          !hitElement?.locked
        ) {
          if (
            hitElement &&
            isEmbeddableElement(hitElement) &&
            this.isEmbeddableCenter(
              hitElement,
              event,
              scenePointerX,
              scenePointerY,
            )
          ) {
            setCursor(this.interactiveCanvas, CURSOR_TYPE.POINTER);
            this.setState({
              activeEmbeddable: { element: hitElement, state: "hover" },
            });
          } else {
            setCursor(this.interactiveCanvas, CURSOR_TYPE.MOVE);
            if (this.state.activeEmbeddable?.state === "hover") {
              this.setState({ activeEmbeddable: null });
            }
          }
        }
      } else {
        setCursor(this.interactiveCanvas, CURSOR_TYPE.AUTO);
      }
    }
  };

  private handleEraser = (
    event: PointerEvent,
    pointerDownState: PointerDownState,
    scenePointer: { x: number; y: number },
  ) => {
    const updateElementIds = (elements: ExcalidrawElement[]) => {
      elements.forEach((element) => {
        if (element.locked) {
          return;
        }

        idsToUpdate.push(element.id);
        if (event.altKey) {
          if (
            pointerDownState.elementIdsToErase[element.id] &&
            pointerDownState.elementIdsToErase[element.id].erase
          ) {
            pointerDownState.elementIdsToErase[element.id].erase = false;
          }
        } else if (!pointerDownState.elementIdsToErase[element.id]) {
          pointerDownState.elementIdsToErase[element.id] = {
            erase: true,
            opacity: element.opacity,
          };
        }
      });
    };

    const idsToUpdate: Array<string> = [];

    const distance = distance2d(
      pointerDownState.lastCoords.x,
      pointerDownState.lastCoords.y,
      scenePointer.x,
      scenePointer.y,
    );
    const threshold = 10 / this.state.zoom.value;
    const point = { ...pointerDownState.lastCoords };
    let samplingInterval = 0;
    while (samplingInterval <= distance) {
      const hitElements = this.getElementsAtPosition(point.x, point.y);
      updateElementIds(hitElements);

      // Exit since we reached current point
      if (samplingInterval === distance) {
        break;
      }

      // Calculate next point in the line at a distance of sampling interval
      samplingInterval = Math.min(samplingInterval + threshold, distance);

      const distanceRatio = samplingInterval / distance;
      const nextX =
        (1 - distanceRatio) * point.x + distanceRatio * scenePointer.x;
      const nextY =
        (1 - distanceRatio) * point.y + distanceRatio * scenePointer.y;
      point.x = nextX;
      point.y = nextY;
    }

    const elements = this.scene.getElementsIncludingDeleted().map((ele) => {
      const id =
        isBoundToContainer(ele) && idsToUpdate.includes(ele.containerId)
          ? ele.containerId
          : ele.id;
      if (idsToUpdate.includes(id)) {
        if (event.altKey) {
          if (
            pointerDownState.elementIdsToErase[id] &&
            pointerDownState.elementIdsToErase[id].erase === false
          ) {
            return newElementWith(ele, {
              opacity: pointerDownState.elementIdsToErase[id].opacity,
            });
          }
        } else {
          return newElementWith(ele, {
            opacity: ELEMENT_READY_TO_ERASE_OPACITY,
          });
        }
      }
      return ele;
    });

    this.scene.replaceAllElements(elements);

    pointerDownState.lastCoords.x = scenePointer.x;
    pointerDownState.lastCoords.y = scenePointer.y;
  };
  // set touch moving for mobile context menu
  private handleTouchMove = (event: React.TouchEvent<HTMLCanvasElement>) => {
    invalidateContextMenu = true;
  };

  handleHoverSelectedLinearElement(
    linearElementEditor: LinearElementEditor,
    scenePointerX: number,
    scenePointerY: number,
  ) {
    const element = LinearElementEditor.getElement(
      linearElementEditor.elementId,
    );

    const boundTextElement = getBoundTextElement(element);

    if (!element) {
      return;
    }
    if (this.state.selectedLinearElement) {
      let hoverPointIndex = -1;
      let segmentMidPointHoveredCoords = null;
      if (
        isHittingElementNotConsideringBoundingBox(
          element,
          this.state,
          this.frameNameBoundsCache,
          [scenePointerX, scenePointerY],
        )
      ) {
        hoverPointIndex = LinearElementEditor.getPointIndexUnderCursor(
          element,
          this.state.zoom,
          scenePointerX,
          scenePointerY,
        );
        segmentMidPointHoveredCoords =
          LinearElementEditor.getSegmentMidpointHitCoords(
            linearElementEditor,
            { x: scenePointerX, y: scenePointerY },
            this.state,
          );

        if (hoverPointIndex >= 0 || segmentMidPointHoveredCoords) {
          setCursor(this.interactiveCanvas, CURSOR_TYPE.POINTER);
        } else {
          setCursor(this.interactiveCanvas, CURSOR_TYPE.MOVE);
        }
      } else if (
        shouldShowBoundingBox([element], this.state) &&
        isHittingElementBoundingBoxWithoutHittingElement(
          element,
          this.state,
          this.frameNameBoundsCache,
          scenePointerX,
          scenePointerY,
        )
      ) {
        setCursor(this.interactiveCanvas, CURSOR_TYPE.MOVE);
      } else if (
        boundTextElement &&
        hitTest(
          boundTextElement,
          this.state,
          this.frameNameBoundsCache,
          scenePointerX,
          scenePointerY,
        )
      ) {
        setCursor(this.interactiveCanvas, CURSOR_TYPE.MOVE);
      }

      if (
        this.state.selectedLinearElement.hoverPointIndex !== hoverPointIndex
      ) {
        this.setState({
          selectedLinearElement: {
            ...this.state.selectedLinearElement,
            hoverPointIndex,
          },
        });
      }

      if (
        !LinearElementEditor.arePointsEqual(
          this.state.selectedLinearElement.segmentMidPointHoveredCoords,
          segmentMidPointHoveredCoords,
        )
      ) {
        this.setState({
          selectedLinearElement: {
            ...this.state.selectedLinearElement,
            segmentMidPointHoveredCoords,
          },
        });
      }
    } else {
      setCursor(this.interactiveCanvas, CURSOR_TYPE.AUTO);
    }
  }

  private handleCanvasPointerDown = (
    event: React.PointerEvent<HTMLElement>,
  ) => {
    // since contextMenu options are potentially evaluated on each render,
    // and an contextMenu action may depend on selection state, we must
    // close the contextMenu before we update the selection on pointerDown
    // (e.g. resetting selection)
    if (this.state.contextMenu) {
      this.setState({ contextMenu: null });
    }

    if (this.state.snapLines) {
      this.setAppState({ snapLines: [] });
    }

    this.updateGestureOnPointerDown(event);

    // if dragging element is freedraw and another pointerdown event occurs
    // a second finger is on the screen
    // discard the freedraw element if it is very short because it is likely
    // just a spike, otherwise finalize the freedraw element when the second
    // finger is lifted
    if (
      event.pointerType === "touch" &&
      this.state.draggingElement &&
      this.state.draggingElement.type === "freedraw"
    ) {
      const element = this.state.draggingElement as ExcalidrawFreeDrawElement;
      this.updateScene({
        ...(element.points.length < 10
          ? {
              elements: this.scene
                .getElementsIncludingDeleted()
                .filter((el) => el.id !== element.id),
            }
          : {}),
        appState: {
          draggingElement: null,
          editingElement: null,
          startBoundElement: null,
          suggestedBindings: [],
          selectedElementIds: makeNextSelectedElementIds(
            Object.keys(this.state.selectedElementIds)
              .filter((key) => key !== element.id)
              .reduce((obj: { [id: string]: true }, key) => {
                obj[key] = this.state.selectedElementIds[key];
                return obj;
              }, {}),
            this.state,
          ),
        },
      });
      return;
    }

    // remove any active selection when we start to interact with canvas
    // (mainly, we care about removing selection outside the component which
    //  would prevent our copy handling otherwise)
    const selection = document.getSelection();
    if (selection?.anchorNode) {
      selection.removeAllRanges();
    }
    this.maybeOpenContextMenuAfterPointerDownOnTouchDevices(event);
    this.maybeCleanupAfterMissingPointerUp(event);

    //fires only once, if pen is detected, penMode is enabled
    //the user can disable this by toggling the penMode button
    if (!this.state.penDetected && event.pointerType === "pen") {
      this.setState((prevState) => {
        return {
          penMode: true,
          penDetected: true,
        };
      });
    }

    if (
      !this.device.isTouchScreen &&
      ["pen", "touch"].includes(event.pointerType)
    ) {
      this.device = updateObject(this.device, { isTouchScreen: true });
    }

    if (isPanning) {
      return;
    }

    this.lastPointerDownEvent = event;

    // we must exit before we set `cursorButton` state and `savePointer`
    // else it will send pointer state & laser pointer events in collab when
    // panning
    if (this.handleCanvasPanUsingWheelOrSpaceDrag(event)) {
      return;
    }

    this.setState({
      lastPointerDownWith: event.pointerType,
      cursorButton: "down",
    });
    this.savePointer(event.clientX, event.clientY, "down");

    // only handle left mouse button or touch
    if (
      event.button !== POINTER_BUTTON.MAIN &&
      event.button !== POINTER_BUTTON.TOUCH
    ) {
      return;
    }

    // don't select while panning
    if (gesture.pointers.size > 1) {
      return;
    }

    // State for the duration of a pointer interaction, which starts with a
    // pointerDown event, ends with a pointerUp event (or another pointerDown)
    const pointerDownState = this.initialPointerDownState(event);

    this.setState({
      selectedElementsAreBeingDragged: false,
    });

    if (this.handleDraggingScrollBar(event, pointerDownState)) {
      return;
    }

    this.clearSelectionIfNotUsingSelection();
    this.updateBindingEnabledOnPointerMove(event);

    if (this.handleSelectionOnPointerDown(event, pointerDownState)) {
      return;
    }

    const allowOnPointerDown =
      !this.state.penMode ||
      event.pointerType !== "touch" ||
      this.state.activeTool.type === "selection" ||
      this.state.activeTool.type === "text" ||
      this.state.activeTool.type === "image";

    if (!allowOnPointerDown) {
      return;
    }

    if (this.state.activeTool.type === "text") {
      this.handleTextOnPointerDown(event, pointerDownState);
      return;
    } else if (
      this.state.activeTool.type === "arrow" ||
      this.state.activeTool.type === "line"
    ) {
      this.handleLinearElementOnPointerDown(
        event,
        this.state.activeTool.type,
        pointerDownState,
      );
    } else if (this.state.activeTool.type === "image") {
      // reset image preview on pointerdown
      setCursor(this.interactiveCanvas, CURSOR_TYPE.CROSSHAIR);

      // retrieve the latest element as the state may be stale
      const pendingImageElement =
        this.state.pendingImageElementId &&
        this.scene.getElement(this.state.pendingImageElementId);

      if (!pendingImageElement) {
        return;
      }

      this.setState({
        draggingElement: pendingImageElement,
        editingElement: pendingImageElement,
        pendingImageElementId: null,
        multiElement: null,
      });

      const { x, y } = viewportCoordsToSceneCoords(event, this.state);

      const frame = this.getTopLayerFrameAtSceneCoords({ x, y });

      mutateElement(pendingImageElement, {
        x,
        y,
        frameId: frame ? frame.id : null,
      });
    } else if (this.state.activeTool.type === "freedraw") {
      this.handleFreeDrawElementOnPointerDown(
        event,
        this.state.activeTool.type,
        pointerDownState,
      );
    } else if (this.state.activeTool.type === "custom") {
      setCursorForShape(this.interactiveCanvas, this.state);
    } else if (this.state.activeTool.type === "frame") {
      this.createFrameElementOnPointerDown(pointerDownState);
    } else if (this.state.activeTool.type === "laser") {
      this.laserPathManager.startPath(
        pointerDownState.lastCoords.x,
        pointerDownState.lastCoords.y,
      );
    } else if (
      this.state.activeTool.type !== "eraser" &&
      this.state.activeTool.type !== "hand"
    ) {
      this.createGenericElementOnPointerDown(
        this.state.activeTool.type,
        pointerDownState,
      );
    }

    this.props?.onPointerDown?.(this.state.activeTool, pointerDownState);
    this.onPointerDownEmitter.trigger(
      this.state.activeTool,
      pointerDownState,
      event,
    );

    const onPointerMove =
      this.onPointerMoveFromPointerDownHandler(pointerDownState);

    const onPointerUp =
      this.onPointerUpFromPointerDownHandler(pointerDownState);

    const onKeyDown = this.onKeyDownFromPointerDownHandler(pointerDownState);
    const onKeyUp = this.onKeyUpFromPointerDownHandler(pointerDownState);

    lastPointerUp = onPointerUp;

    if (!this.state.viewModeEnabled || this.state.activeTool.type === "laser") {
      window.addEventListener(EVENT.POINTER_MOVE, onPointerMove);
      window.addEventListener(EVENT.POINTER_UP, onPointerUp);
      window.addEventListener(EVENT.KEYDOWN, onKeyDown);
      window.addEventListener(EVENT.KEYUP, onKeyUp);
      pointerDownState.eventListeners.onMove = onPointerMove;
      pointerDownState.eventListeners.onUp = onPointerUp;
      pointerDownState.eventListeners.onKeyUp = onKeyUp;
      pointerDownState.eventListeners.onKeyDown = onKeyDown;
    }
  };

  private handleCanvasPointerUp = (
    event: React.PointerEvent<HTMLCanvasElement>,
  ) => {
    this.removePointer(event);
    this.lastPointerUpEvent = event;

    const scenePointer = viewportCoordsToSceneCoords(
      { clientX: event.clientX, clientY: event.clientY },
      this.state,
    );
    const clicklength =
      event.timeStamp - (this.lastPointerDownEvent?.timeStamp ?? 0);
    if (this.device.editor.isMobile && clicklength < 300) {
      const hitElement = this.getElementAtPosition(
        scenePointer.x,
        scenePointer.y,
      );
      if (
        isEmbeddableElement(hitElement) &&
        this.isEmbeddableCenter(
          hitElement,
          event,
          scenePointer.x,
          scenePointer.y,
        )
      ) {
        this.handleEmbeddableCenterClick(hitElement);
        return;
      }
    }

    if (this.device.isTouchScreen) {
      const hitElement = this.getElementAtPosition(
        scenePointer.x,
        scenePointer.y,
      );
      this.hitLinkElement = this.getElementLinkAtPosition(
        scenePointer,
        hitElement,
      );
    }

    if (
      this.hitLinkElement &&
      !this.state.selectedElementIds[this.hitLinkElement.id]
    ) {
      if (
        clicklength < 300 &&
        this.hitLinkElement.type === "embeddable" &&
        !isPointHittingLinkIcon(this.hitLinkElement, this.state, [
          scenePointer.x,
          scenePointer.y,
        ])
      ) {
        this.handleEmbeddableCenterClick(this.hitLinkElement);
      } else {
        this.redirectToLink(event, this.device.isTouchScreen);
      }
    } else if (this.state.viewModeEnabled) {
      this.setState({
        activeEmbeddable: null,
        selectedElementIds: {},
      });
    }
  };

  private maybeOpenContextMenuAfterPointerDownOnTouchDevices = (
    event: React.PointerEvent<HTMLElement>,
  ): void => {
    // deal with opening context menu on touch devices
    if (event.pointerType === "touch") {
      invalidateContextMenu = false;

      if (touchTimeout) {
        // If there's already a touchTimeout, this means that there's another
        // touch down and we are doing another touch, so we shouldn't open the
        // context menu.
        invalidateContextMenu = true;
      } else {
        // open the context menu with the first touch's clientX and clientY
        // if the touch is not moving
        touchTimeout = window.setTimeout(() => {
          touchTimeout = 0;
          if (!invalidateContextMenu) {
            this.handleCanvasContextMenu(event);
          }
        }, TOUCH_CTX_MENU_TIMEOUT);
      }
    }
  };

  private resetContextMenuTimer = () => {
    clearTimeout(touchTimeout);
    touchTimeout = 0;
    invalidateContextMenu = false;
  };

  private maybeCleanupAfterMissingPointerUp(
    event: React.PointerEvent<HTMLElement>,
  ): void {
    if (lastPointerUp !== null) {
      // Unfortunately, sometimes we don't get a pointerup after a pointerdown,
      // this can happen when a contextual menu or alert is triggered. In order to avoid
      // being in a weird state, we clean up on the next pointerdown
      lastPointerUp(event);
    }
  }

  // Returns whether the event is a panning
  private handleCanvasPanUsingWheelOrSpaceDrag = (
    event: React.PointerEvent<HTMLElement>,
  ): boolean => {
    if (
      !(
        gesture.pointers.size <= 1 &&
        (event.button === POINTER_BUTTON.WHEEL ||
          (event.button === POINTER_BUTTON.MAIN && isHoldingSpace) ||
          isHandToolActive(this.state) ||
          this.state.viewModeEnabled)
      ) ||
      isTextElement(this.state.editingElement)
    ) {
      return false;
    }
    isPanning = true;
    event.preventDefault();

    let nextPastePrevented = false;
    const isLinux = /Linux/.test(window.navigator.platform);

    setCursor(this.interactiveCanvas, CURSOR_TYPE.GRABBING);
    let { clientX: lastX, clientY: lastY } = event;
    const onPointerMove = withBatchedUpdatesThrottled((event: PointerEvent) => {
      const deltaX = lastX - event.clientX;
      const deltaY = lastY - event.clientY;
      lastX = event.clientX;
      lastY = event.clientY;

      /*
       * Prevent paste event if we move while middle clicking on Linux.
       * See issue #1383.
       */
      if (
        isLinux &&
        !nextPastePrevented &&
        (Math.abs(deltaX) > 1 || Math.abs(deltaY) > 1)
      ) {
        nextPastePrevented = true;

        /* Prevent the next paste event */
        const preventNextPaste = (event: ClipboardEvent) => {
          document.body.removeEventListener(EVENT.PASTE, preventNextPaste);
          event.stopPropagation();
        };

        /*
         * Reenable next paste in case of disabled middle click paste for
         * any reason:
         * - right click paste
         * - empty clipboard
         */
        const enableNextPaste = () => {
          setTimeout(() => {
            document.body.removeEventListener(EVENT.PASTE, preventNextPaste);
            window.removeEventListener(EVENT.POINTER_UP, enableNextPaste);
          }, 100);
        };

        document.body.addEventListener(EVENT.PASTE, preventNextPaste);
        window.addEventListener(EVENT.POINTER_UP, enableNextPaste);
      }

      this.translateCanvas({
        scrollX: this.state.scrollX - deltaX / this.state.zoom.value,
        scrollY: this.state.scrollY - deltaY / this.state.zoom.value,
      });
    });
    const teardown = withBatchedUpdates(
      (lastPointerUp = () => {
        lastPointerUp = null;
        isPanning = false;
        if (!isHoldingSpace) {
          if (this.state.viewModeEnabled) {
            setCursor(this.interactiveCanvas, CURSOR_TYPE.GRAB);
          } else {
            setCursorForShape(this.interactiveCanvas, this.state);
          }
        }
        this.setState({
          cursorButton: "up",
        });
        this.savePointer(event.clientX, event.clientY, "up");
        window.removeEventListener(EVENT.POINTER_MOVE, onPointerMove);
        window.removeEventListener(EVENT.POINTER_UP, teardown);
        window.removeEventListener(EVENT.BLUR, teardown);
        onPointerMove.flush();
      }),
    );
    window.addEventListener(EVENT.BLUR, teardown);
    window.addEventListener(EVENT.POINTER_MOVE, onPointerMove, {
      passive: true,
    });
    window.addEventListener(EVENT.POINTER_UP, teardown);
    return true;
  };

  private updateGestureOnPointerDown(
    event: React.PointerEvent<HTMLElement>,
  ): void {
    gesture.pointers.set(event.pointerId, {
      x: event.clientX,
      y: event.clientY,
    });

    if (gesture.pointers.size === 2) {
      gesture.lastCenter = getCenter(gesture.pointers);
      gesture.initialScale = this.state.zoom.value;
      gesture.initialDistance = getDistance(
        Array.from(gesture.pointers.values()),
      );
    }
  }

  private initialPointerDownState(
    event: React.PointerEvent<HTMLElement>,
  ): PointerDownState {
    const origin = viewportCoordsToSceneCoords(event, this.state);
    const selectedElements = this.scene.getSelectedElements(this.state);
    const [minX, minY, maxX, maxY] = getCommonBounds(selectedElements);

    return {
      origin,
      withCmdOrCtrl: event[KEYS.CTRL_OR_CMD],
      originInGrid: tupleToCoors(
        getGridPoint(
          origin.x,
          origin.y,
          event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
        ),
      ),
      scrollbars: isOverScrollBars(
        currentScrollBars,
        event.clientX - this.state.offsetLeft,
        event.clientY - this.state.offsetTop,
      ),
      // we need to duplicate because we'll be updating this state
      lastCoords: { ...origin },
      originalElements: this.scene
        .getNonDeletedElements()
        .reduce((acc, element) => {
          acc.set(element.id, deepCopyElement(element));
          return acc;
        }, new Map() as PointerDownState["originalElements"]),
      resize: {
        handleType: false,
        isResizing: false,
        offset: { x: 0, y: 0 },
        arrowDirection: "origin",
        center: { x: (maxX + minX) / 2, y: (maxY + minY) / 2 },
      },
      hit: {
        element: null,
        allHitElements: [],
        wasAddedToSelection: false,
        hasBeenDuplicated: false,
        hasHitCommonBoundingBoxOfSelectedElements:
          this.isHittingCommonBoundingBoxOfSelectedElements(
            origin,
            selectedElements,
          ),
      },
      drag: {
        hasOccurred: false,
        offset: null,
      },
      eventListeners: {
        onMove: null,
        onUp: null,
        onKeyUp: null,
        onKeyDown: null,
      },
      boxSelection: {
        hasOccurred: false,
      },
      elementIdsToErase: {},
    };
  }

  // Returns whether the event is a dragging a scrollbar
  private handleDraggingScrollBar(
    event: React.PointerEvent<HTMLElement>,
    pointerDownState: PointerDownState,
  ): boolean {
    if (
      !(pointerDownState.scrollbars.isOverEither && !this.state.multiElement)
    ) {
      return false;
    }
    isDraggingScrollBar = true;
    pointerDownState.lastCoords.x = event.clientX;
    pointerDownState.lastCoords.y = event.clientY;
    const onPointerMove = withBatchedUpdatesThrottled((event: PointerEvent) => {
      const target = event.target;
      if (!(target instanceof HTMLElement)) {
        return;
      }

      this.handlePointerMoveOverScrollbars(event, pointerDownState);
    });

    const onPointerUp = withBatchedUpdates(() => {
      isDraggingScrollBar = false;
      setCursorForShape(this.interactiveCanvas, this.state);
      lastPointerUp = null;
      this.setState({
        cursorButton: "up",
      });
      this.savePointer(event.clientX, event.clientY, "up");
      window.removeEventListener(EVENT.POINTER_MOVE, onPointerMove);
      window.removeEventListener(EVENT.POINTER_UP, onPointerUp);
      onPointerMove.flush();
    });

    lastPointerUp = onPointerUp;

    window.addEventListener(EVENT.POINTER_MOVE, onPointerMove);
    window.addEventListener(EVENT.POINTER_UP, onPointerUp);
    return true;
  }

  private clearSelectionIfNotUsingSelection = (): void => {
    if (this.state.activeTool.type !== "selection") {
      this.setState({
        selectedElementIds: makeNextSelectedElementIds({}, this.state),
        selectedGroupIds: {},
        editingGroupId: null,
        activeEmbeddable: null,
      });
    }
  };

  /**
   * @returns whether the pointer event has been completely handled
   */
  private handleSelectionOnPointerDown = (
    event: React.PointerEvent<HTMLElement>,
    pointerDownState: PointerDownState,
  ): boolean => {
    if (this.state.activeTool.type === "selection") {
      const elements = this.scene.getNonDeletedElements();
      const selectedElements = this.scene.getSelectedElements(this.state);
      if (selectedElements.length === 1 && !this.state.editingLinearElement) {
        const elementWithTransformHandleType =
          getElementWithTransformHandleType(
            elements,
            this.state,
            pointerDownState.origin.x,
            pointerDownState.origin.y,
            this.state.zoom,
            event.pointerType,
          );
        if (elementWithTransformHandleType != null) {
          this.setState({
            resizingElement: elementWithTransformHandleType.element,
          });
          pointerDownState.resize.handleType =
            elementWithTransformHandleType.transformHandleType;
        }
      } else if (selectedElements.length > 1) {
        pointerDownState.resize.handleType = getTransformHandleTypeFromCoords(
          getCommonBounds(selectedElements),
          pointerDownState.origin.x,
          pointerDownState.origin.y,
          this.state.zoom,
          event.pointerType,
        );
      }
      if (pointerDownState.resize.handleType) {
        pointerDownState.resize.isResizing = true;
        pointerDownState.resize.offset = tupleToCoors(
          getResizeOffsetXY(
            pointerDownState.resize.handleType,
            selectedElements,
            pointerDownState.origin.x,
            pointerDownState.origin.y,
          ),
        );
        if (
          selectedElements.length === 1 &&
          isLinearElement(selectedElements[0]) &&
          selectedElements[0].points.length === 2
        ) {
          pointerDownState.resize.arrowDirection = getResizeArrowDirection(
            pointerDownState.resize.handleType,
            selectedElements[0],
          );
        }
      } else {
        if (this.state.selectedLinearElement) {
          const linearElementEditor =
            this.state.editingLinearElement || this.state.selectedLinearElement;
          const ret = LinearElementEditor.handlePointerDown(
            event,
            this.state,
            this.history,
            pointerDownState.origin,
            linearElementEditor,
          );
          if (ret.hitElement) {
            pointerDownState.hit.element = ret.hitElement;
          }
          if (ret.linearElementEditor) {
            this.setState({ selectedLinearElement: ret.linearElementEditor });

            if (this.state.editingLinearElement) {
              this.setState({ editingLinearElement: ret.linearElementEditor });
            }
          }
          if (ret.didAddPoint) {
            return true;
          }
        }
        // hitElement may already be set above, so check first
        pointerDownState.hit.element =
          pointerDownState.hit.element ??
          this.getElementAtPosition(
            pointerDownState.origin.x,
            pointerDownState.origin.y,
          );

        if (pointerDownState.hit.element) {
          // Early return if pointer is hitting link icon
          const hitLinkElement = this.getElementLinkAtPosition(
            {
              x: pointerDownState.origin.x,
              y: pointerDownState.origin.y,
            },
            pointerDownState.hit.element,
          );
          if (hitLinkElement) {
            return false;
          }
        }

        // For overlapped elements one position may hit
        // multiple elements
        pointerDownState.hit.allHitElements = this.getElementsAtPosition(
          pointerDownState.origin.x,
          pointerDownState.origin.y,
        );

        const hitElement = pointerDownState.hit.element;
        const someHitElementIsSelected =
          pointerDownState.hit.allHitElements.some((element) =>
            this.isASelectedElement(element),
          );
        if (
          (hitElement === null || !someHitElementIsSelected) &&
          !event.shiftKey &&
          !pointerDownState.hit.hasHitCommonBoundingBoxOfSelectedElements
        ) {
          this.clearSelection(hitElement);
        }

        if (this.state.editingLinearElement) {
          this.setState({
            selectedElementIds: makeNextSelectedElementIds(
              {
                [this.state.editingLinearElement.elementId]: true,
              },
              this.state,
            ),
          });
          // If we click on something
        } else if (hitElement != null) {
          // on CMD/CTRL, drill down to hit element regardless of groups etc.
          if (event[KEYS.CTRL_OR_CMD]) {
            if (!this.state.selectedElementIds[hitElement.id]) {
              pointerDownState.hit.wasAddedToSelection = true;
            }
            this.setState((prevState) => ({
              ...editGroupForSelectedElement(prevState, hitElement),
              previousSelectedElementIds: this.state.selectedElementIds,
            }));
            // mark as not completely handled so as to allow dragging etc.
            return false;
          }

          // deselect if item is selected
          // if shift is not clicked, this will always return true
          // otherwise, it will trigger selection based on current
          // state of the box
          if (!this.state.selectedElementIds[hitElement.id]) {
            // if we are currently editing a group, exiting editing mode and deselect the group.
            if (
              this.state.editingGroupId &&
              !isElementInGroup(hitElement, this.state.editingGroupId)
            ) {
              this.setState({
                selectedElementIds: makeNextSelectedElementIds({}, this.state),
                selectedGroupIds: {},
                editingGroupId: null,
                activeEmbeddable: null,
              });
            }

            // Add hit element to selection. At this point if we're not holding
            // SHIFT the previously selected element(s) were deselected above
            // (make sure you use setState updater to use latest state)
            // With shift-selection, we want to make sure that frames and their containing
            // elements are not selected at the same time.
            if (
              !someHitElementIsSelected &&
              !pointerDownState.hit.hasHitCommonBoundingBoxOfSelectedElements
            ) {
              this.setState((prevState) => {
                const nextSelectedElementIds: { [id: string]: true } = {
                  ...prevState.selectedElementIds,
                  [hitElement.id]: true,
                };

                const previouslySelectedElements: ExcalidrawElement[] = [];

                Object.keys(prevState.selectedElementIds).forEach((id) => {
                  const element = this.scene.getElement(id);
                  element && previouslySelectedElements.push(element);
                });

                // if hitElement is frame, deselect all of its elements if they are selected
                if (hitElement.type === "frame") {
                  getFrameChildren(
                    previouslySelectedElements,
                    hitElement.id,
                  ).forEach((element) => {
                    delete nextSelectedElementIds[element.id];
                  });
                } else if (hitElement.frameId) {
                  // if hitElement is in a frame and its frame has been selected
                  // disable selection for the given element
                  if (nextSelectedElementIds[hitElement.frameId]) {
                    delete nextSelectedElementIds[hitElement.id];
                  }
                } else {
                  // hitElement is neither a frame nor an element in a frame
                  // but since hitElement could be in a group with some frames
                  // this means selecting hitElement will have the frames selected as well
                  // because we want to keep the invariant:
                  // - frames and their elements are not selected at the same time
                  // we deselect elements in those frames that were previously selected

                  const groupIds = hitElement.groupIds;
                  const framesInGroups = new Set(
                    groupIds
                      .flatMap((gid) =>
                        getElementsInGroup(
                          this.scene.getNonDeletedElements(),
                          gid,
                        ),
                      )
                      .filter((element) => element.type === "frame")
                      .map((frame) => frame.id),
                  );

                  if (framesInGroups.size > 0) {
                    previouslySelectedElements.forEach((element) => {
                      if (
                        element.frameId &&
                        framesInGroups.has(element.frameId)
                      ) {
                        // deselect element and groups containing the element
                        delete nextSelectedElementIds[element.id];
                        element.groupIds
                          .flatMap((gid) =>
                            getElementsInGroup(
                              this.scene.getNonDeletedElements(),
                              gid,
                            ),
                          )
                          .forEach((element) => {
                            delete nextSelectedElementIds[element.id];
                          });
                      }
                    });
                  }
                }

                return {
                  ...selectGroupsForSelectedElements(
                    {
                      editingGroupId: prevState.editingGroupId,
                      selectedElementIds: nextSelectedElementIds,
                    },
                    this.scene.getNonDeletedElements(),
                    prevState,
                    this,
                  ),
                  showHyperlinkPopup:
                    hitElement.link || isEmbeddableElement(hitElement)
                      ? "info"
                      : false,
                };
              });
              pointerDownState.hit.wasAddedToSelection = true;
            }
          }
        }

        this.setState({
          previousSelectedElementIds: this.state.selectedElementIds,
        });
      }
    }
    return false;
  };

  private isASelectedElement(hitElement: ExcalidrawElement | null): boolean {
    return hitElement != null && this.state.selectedElementIds[hitElement.id];
  }

  private isHittingCommonBoundingBoxOfSelectedElements(
    point: Readonly<{ x: number; y: number }>,
    selectedElements: readonly ExcalidrawElement[],
  ): boolean {
    if (selectedElements.length < 2) {
      return false;
    }

    // How many pixels off the shape boundary we still consider a hit
    const threshold = 10 / this.state.zoom.value;
    const [x1, y1, x2, y2] = getCommonBounds(selectedElements);
    return (
      point.x > x1 - threshold &&
      point.x < x2 + threshold &&
      point.y > y1 - threshold &&
      point.y < y2 + threshold
    );
  }

  private handleTextOnPointerDown = (
    event: React.PointerEvent<HTMLElement>,
    pointerDownState: PointerDownState,
  ): void => {
    // if we're currently still editing text, clicking outside
    // should only finalize it, not create another (irrespective
    // of state.activeTool.locked)
    if (isTextElement(this.state.editingElement)) {
      return;
    }
    let sceneX = pointerDownState.origin.x;
    let sceneY = pointerDownState.origin.y;

    const element = this.getElementAtPosition(sceneX, sceneY, {
      includeBoundTextElement: true,
    });

    // FIXME
    let container = getTextBindableContainerAtPosition(
      this.scene.getNonDeletedElements(),
      this.state,
      sceneX,
      sceneY,
    );

    if (hasBoundTextElement(element)) {
      container = element as ExcalidrawTextContainer;
      sceneX = element.x + element.width / 2;
      sceneY = element.y + element.height / 2;
    }
    this.startTextEditing({
      sceneX,
      sceneY,
      insertAtParentCenter: !event.altKey,
      container,
    });

    resetCursor(this.interactiveCanvas);
    if (!this.state.activeTool.locked) {
      this.setState({
        activeTool: updateActiveTool(this.state, { type: "selection" }),
      });
    }
  };

  private handleFreeDrawElementOnPointerDown = (
    event: React.PointerEvent<HTMLElement>,
    elementType: ExcalidrawFreeDrawElement["type"],
    pointerDownState: PointerDownState,
  ) => {
    // Begin a mark capture. This does not have to update state yet.
    const [gridX, gridY] = getGridPoint(
      pointerDownState.origin.x,
      pointerDownState.origin.y,
      null,
    );

    const topLayerFrame = this.getTopLayerFrameAtSceneCoords({
      x: gridX,
      y: gridY,
    });

    const element = newFreeDrawElement({
      type: elementType,
      x: gridX,
      y: gridY,
      strokeColor: this.state.currentItemStrokeColor,
      backgroundColor: this.state.currentItemBackgroundColor,
      fillStyle: this.state.currentItemFillStyle,
      strokeWidth: this.state.currentItemStrokeWidth,
      strokeStyle: this.state.currentItemStrokeStyle,
      roughness: this.state.currentItemRoughness,
      opacity: this.state.currentItemOpacity,
      roundness: null,
      simulatePressure: event.pressure === 0.5,
      locked: false,
      frameId: topLayerFrame ? topLayerFrame.id : null,
    });

    this.setState((prevState) => {
      const nextSelectedElementIds = {
        ...prevState.selectedElementIds,
      };
      delete nextSelectedElementIds[element.id];
      return {
        selectedElementIds: makeNextSelectedElementIds(
          nextSelectedElementIds,
          prevState,
        ),
      };
    });

    const pressures = element.simulatePressure
      ? element.pressures
      : [...element.pressures, event.pressure];

    mutateElement(element, {
      points: [[0, 0]],
      pressures,
    });

    const boundElement = getHoveredElementForBinding(
      pointerDownState.origin,
      this.scene,
    );
    this.scene.addNewElement(element);
    this.setState({
      draggingElement: element,
      editingElement: element,
      startBoundElement: boundElement,
      suggestedBindings: [],
    });
  };

  //create rectangle element with youtube top left on nearest grid point width / hight 640/360
  private insertEmbeddableElement = ({
    sceneX,
    sceneY,
    link,
  }: {
    sceneX: number;
    sceneY: number;
    link: string;
  }) => {
    const [gridX, gridY] = getGridPoint(
      sceneX,
      sceneY,
      this.lastPointerDownEvent?.[KEYS.CTRL_OR_CMD]
        ? null
        : this.state.gridSize,
    );

    const embedLink = getEmbedLink(link);

    if (!embedLink) {
      return;
    }

    if (embedLink.warning) {
      this.setToast({ message: embedLink.warning, closable: true });
    }

    const element = newEmbeddableElement({
      type: "embeddable",
      x: gridX,
      y: gridY,
      strokeColor: "transparent",
      backgroundColor: "transparent",
      fillStyle: this.state.currentItemFillStyle,
      strokeWidth: this.state.currentItemStrokeWidth,
      strokeStyle: this.state.currentItemStrokeStyle,
      roughness: this.state.currentItemRoughness,
      roundness: this.getCurrentItemRoundness("embeddable"),
      opacity: this.state.currentItemOpacity,
      locked: false,
      width: embedLink.aspectRatio.w,
      height: embedLink.aspectRatio.h,
      link,
      validated: null,
    });

    this.scene.replaceAllElements([
      ...this.scene.getElementsIncludingDeleted(),
      element,
    ]);

    return element;
  };

  private createImageElement = ({
    sceneX,
    sceneY,
    addToFrameUnderCursor = true,
  }: {
    sceneX: number;
    sceneY: number;
    addToFrameUnderCursor?: boolean;
  }) => {
    const [gridX, gridY] = getGridPoint(
      sceneX,
      sceneY,
      this.lastPointerDownEvent?.[KEYS.CTRL_OR_CMD]
        ? null
        : this.state.gridSize,
    );

    const topLayerFrame = addToFrameUnderCursor
      ? this.getTopLayerFrameAtSceneCoords({
          x: gridX,
          y: gridY,
        })
      : null;

    const element = newImageElement({
      type: "image",
      x: gridX,
      y: gridY,
      strokeColor: this.state.currentItemStrokeColor,
      backgroundColor: this.state.currentItemBackgroundColor,
      fillStyle: this.state.currentItemFillStyle,
      strokeWidth: this.state.currentItemStrokeWidth,
      strokeStyle: this.state.currentItemStrokeStyle,
      roughness: this.state.currentItemRoughness,
      roundness: null,
      opacity: this.state.currentItemOpacity,
      locked: false,
      frameId: topLayerFrame ? topLayerFrame.id : null,
    });

    return element;
  };

  private handleLinearElementOnPointerDown = (
    event: React.PointerEvent<HTMLElement>,
    elementType: ExcalidrawLinearElement["type"],
    pointerDownState: PointerDownState,
  ): void => {
    if (this.state.multiElement) {
      const { multiElement } = this.state;

      // finalize if completing a loop
      if (
        multiElement.type === "line" &&
        isPathALoop(multiElement.points, this.state.zoom.value)
      ) {
        mutateElement(multiElement, {
          lastCommittedPoint:
            multiElement.points[multiElement.points.length - 1],
        });
        this.actionManager.executeAction(actionFinalize);
        return;
      }

      const { x: rx, y: ry, lastCommittedPoint } = multiElement;

      // clicking inside commit zone → finalize arrow
      if (
        multiElement.points.length > 1 &&
        lastCommittedPoint &&
        distance2d(
          pointerDownState.origin.x - rx,
          pointerDownState.origin.y - ry,
          lastCommittedPoint[0],
          lastCommittedPoint[1],
        ) < LINE_CONFIRM_THRESHOLD
      ) {
        this.actionManager.executeAction(actionFinalize);
        return;
      }

      this.setState((prevState) => ({
        selectedElementIds: makeNextSelectedElementIds(
          {
            ...prevState.selectedElementIds,
            [multiElement.id]: true,
          },
          prevState,
        ),
      }));
      // clicking outside commit zone → update reference for last committed
      // point
      mutateElement(multiElement, {
        lastCommittedPoint: multiElement.points[multiElement.points.length - 1],
      });
      setCursor(this.interactiveCanvas, CURSOR_TYPE.POINTER);
    } else {
      const [gridX, gridY] = getGridPoint(
        pointerDownState.origin.x,
        pointerDownState.origin.y,
        event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
      );

      const topLayerFrame = this.getTopLayerFrameAtSceneCoords({
        x: gridX,
        y: gridY,
      });

      /* If arrow is pre-arrowheads, it will have undefined for both start and end arrowheads.
      If so, we want it to be null for start and "arrow" for end. If the linear item is not
      an arrow, we want it to be null for both. Otherwise, we want it to use the
      values from appState. */

      const { currentItemStartArrowhead, currentItemEndArrowhead } = this.state;
      const [startArrowhead, endArrowhead] =
        elementType === "arrow"
          ? [currentItemStartArrowhead, currentItemEndArrowhead]
          : [null, null];

      const element = newLinearElement({
        type: elementType,
        x: gridX,
        y: gridY,
        strokeColor: this.state.currentItemStrokeColor,
        backgroundColor: this.state.currentItemBackgroundColor,
        fillStyle: this.state.currentItemFillStyle,
        strokeWidth: this.state.currentItemStrokeWidth,
        strokeStyle: this.state.currentItemStrokeStyle,
        roughness: this.state.currentItemRoughness,
        opacity: this.state.currentItemOpacity,
        roundness:
          this.state.currentItemRoundness === "round"
            ? { type: ROUNDNESS.PROPORTIONAL_RADIUS }
            : null,
        startArrowhead,
        endArrowhead,
        locked: false,
        frameId: topLayerFrame ? topLayerFrame.id : null,
      });
      this.setState((prevState) => {
        const nextSelectedElementIds = {
          ...prevState.selectedElementIds,
        };
        delete nextSelectedElementIds[element.id];
        return {
          selectedElementIds: makeNextSelectedElementIds(
            nextSelectedElementIds,
            prevState,
          ),
        };
      });
      mutateElement(element, {
        points: [...element.points, [0, 0]],
      });
      const boundElement = getHoveredElementForBinding(
        pointerDownState.origin,
        this.scene,
      );

      this.scene.addNewElement(element);
      this.setState({
        draggingElement: element,
        editingElement: element,
        startBoundElement: boundElement,
        suggestedBindings: [],
      });
    }
  };

  private getCurrentItemRoundness(
    elementType:
      | "selection"
      | "rectangle"
      | "diamond"
      | "ellipse"
      | "embeddable",
  ) {
    return this.state.currentItemRoundness === "round"
      ? {
          type: isUsingAdaptiveRadius(elementType)
            ? ROUNDNESS.ADAPTIVE_RADIUS
            : ROUNDNESS.PROPORTIONAL_RADIUS,
        }
      : null;
  }

  private createGenericElementOnPointerDown = (
    elementType: ExcalidrawGenericElement["type"] | "embeddable",
    pointerDownState: PointerDownState,
  ): void => {
    const [gridX, gridY] = getGridPoint(
      pointerDownState.origin.x,
      pointerDownState.origin.y,
      this.lastPointerDownEvent?.[KEYS.CTRL_OR_CMD]
        ? null
        : this.state.gridSize,
    );

    const topLayerFrame = this.getTopLayerFrameAtSceneCoords({
      x: gridX,
      y: gridY,
    });

    const baseElementAttributes = {
      x: gridX,
      y: gridY,
      strokeColor: this.state.currentItemStrokeColor,
      backgroundColor: this.state.currentItemBackgroundColor,
      fillStyle: this.state.currentItemFillStyle,
      strokeWidth: this.state.currentItemStrokeWidth,
      strokeStyle: this.state.currentItemStrokeStyle,
      roughness: this.state.currentItemRoughness,
      opacity: this.state.currentItemOpacity,
      roundness: this.getCurrentItemRoundness(elementType),
      locked: false,
      frameId: topLayerFrame ? topLayerFrame.id : null,
    } as const;

    let element;
    if (elementType === "embeddable") {
      element = newEmbeddableElement({
        type: "embeddable",
        validated: null,
        ...baseElementAttributes,
      });
    } else {
      element = newElement({
        type: elementType,
        ...baseElementAttributes,
      });
    }

    if (element.type === "selection") {
      this.setState({
        selectionElement: element,
        draggingElement: element,
      });
    } else {
      this.scene.addNewElement(element);
      this.setState({
        multiElement: null,
        draggingElement: element,
        editingElement: element,
      });
    }
  };

  private createFrameElementOnPointerDown = (
    pointerDownState: PointerDownState,
  ): void => {
    const [gridX, gridY] = getGridPoint(
      pointerDownState.origin.x,
      pointerDownState.origin.y,
      this.lastPointerDownEvent?.[KEYS.CTRL_OR_CMD]
        ? null
        : this.state.gridSize,
    );

    const frame = newFrameElement({
      x: gridX,
      y: gridY,
      opacity: this.state.currentItemOpacity,
      locked: false,
      ...FRAME_STYLE,
    });

    this.scene.replaceAllElements([
      ...this.scene.getElementsIncludingDeleted(),
      frame,
    ]);

    this.setState({
      multiElement: null,
      draggingElement: frame,
      editingElement: frame,
    });
  };

  private maybeCacheReferenceSnapPoints(
    event: KeyboardModifiersObject,
    selectedElements: ExcalidrawElement[],
    recomputeAnyways: boolean = false,
  ) {
    if (
      isSnappingEnabled({
        event,
        appState: this.state,
        selectedElements,
      }) &&
      (recomputeAnyways || !SnapCache.getReferenceSnapPoints())
    ) {
      SnapCache.setReferenceSnapPoints(
        getReferenceSnapPoints(
          this.scene.getNonDeletedElements(),
          selectedElements,
          this.state,
        ),
      );
    }
  }

  private maybeCacheVisibleGaps(
    event: KeyboardModifiersObject,
    selectedElements: ExcalidrawElement[],
    recomputeAnyways: boolean = false,
  ) {
    if (
      isSnappingEnabled({
        event,
        appState: this.state,
        selectedElements,
      }) &&
      (recomputeAnyways || !SnapCache.getVisibleGaps())
    ) {
      SnapCache.setVisibleGaps(
        getVisibleGaps(
          this.scene.getNonDeletedElements(),
          selectedElements,
          this.state,
        ),
      );
    }
  }

  private onKeyDownFromPointerDownHandler(
    pointerDownState: PointerDownState,
  ): (event: KeyboardEvent) => void {
    return withBatchedUpdates((event: KeyboardEvent) => {
      if (this.maybeHandleResize(pointerDownState, event)) {
        return;
      }
      this.maybeDragNewGenericElement(pointerDownState, event);
    });
  }

  private onKeyUpFromPointerDownHandler(
    pointerDownState: PointerDownState,
  ): (event: KeyboardEvent) => void {
    return withBatchedUpdates((event: KeyboardEvent) => {
      // Prevents focus from escaping excalidraw tab
      event.key === KEYS.ALT && event.preventDefault();
      if (this.maybeHandleResize(pointerDownState, event)) {
        return;
      }
      this.maybeDragNewGenericElement(pointerDownState, event);
    });
  }

  private onPointerMoveFromPointerDownHandler(
    pointerDownState: PointerDownState,
  ) {
    return withBatchedUpdatesThrottled((event: PointerEvent) => {
      // We need to initialize dragOffsetXY only after we've updated
      // `state.selectedElementIds` on pointerDown. Doing it here in pointerMove
      // event handler should hopefully ensure we're already working with
      // the updated state.
      if (pointerDownState.drag.offset === null) {
        pointerDownState.drag.offset = tupleToCoors(
          getDragOffsetXY(
            this.scene.getSelectedElements(this.state),
            pointerDownState.origin.x,
            pointerDownState.origin.y,
          ),
        );
      }
      const target = event.target;
      if (!(target instanceof HTMLElement)) {
        return;
      }

      if (this.handlePointerMoveOverScrollbars(event, pointerDownState)) {
        return;
      }

      const pointerCoords = viewportCoordsToSceneCoords(event, this.state);

      if (isEraserActive(this.state)) {
        this.handleEraser(event, pointerDownState, pointerCoords);
        return;
      }

      if (this.state.activeTool.type === "laser") {
        this.laserPathManager.addPointToPath(pointerCoords.x, pointerCoords.y);
      }

      const [gridX, gridY] = getGridPoint(
        pointerCoords.x,
        pointerCoords.y,
        event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
      );

      // for arrows/lines, don't start dragging until a given threshold
      // to ensure we don't create a 2-point arrow by mistake when
      // user clicks mouse in a way that it moves a tiny bit (thus
      // triggering pointermove)
      if (
        !pointerDownState.drag.hasOccurred &&
        (this.state.activeTool.type === "arrow" ||
          this.state.activeTool.type === "line")
      ) {
        if (
          distance2d(
            pointerCoords.x,
            pointerCoords.y,
            pointerDownState.origin.x,
            pointerDownState.origin.y,
          ) < DRAGGING_THRESHOLD
        ) {
          return;
        }
      }
      if (pointerDownState.resize.isResizing) {
        pointerDownState.lastCoords.x = pointerCoords.x;
        pointerDownState.lastCoords.y = pointerCoords.y;
        if (this.maybeHandleResize(pointerDownState, event)) {
          return true;
        }
      }

      if (this.state.selectedLinearElement) {
        const linearElementEditor =
          this.state.editingLinearElement || this.state.selectedLinearElement;

        if (
          LinearElementEditor.shouldAddMidpoint(
            this.state.selectedLinearElement,
            pointerCoords,
            this.state,
          )
        ) {
          const ret = LinearElementEditor.addMidpoint(
            this.state.selectedLinearElement,
            pointerCoords,
            this.state,
            !event[KEYS.CTRL_OR_CMD],
          );
          if (!ret) {
            return;
          }

          // Since we are reading from previous state which is not possible with
          // automatic batching in React 18 hence using flush sync to synchronously
          // update the state. Check https://github.com/excalidraw/excalidraw/pull/5508 for more details.

          flushSync(() => {
            if (this.state.selectedLinearElement) {
              this.setState({
                selectedLinearElement: {
                  ...this.state.selectedLinearElement,
                  pointerDownState: ret.pointerDownState,
                  selectedPointsIndices: ret.selectedPointsIndices,
                },
              });
            }
            if (this.state.editingLinearElement) {
              this.setState({
                editingLinearElement: {
                  ...this.state.editingLinearElement,
                  pointerDownState: ret.pointerDownState,
                  selectedPointsIndices: ret.selectedPointsIndices,
                },
              });
            }
          });

          return;
        } else if (
          linearElementEditor.pointerDownState.segmentMidpoint.value !== null &&
          !linearElementEditor.pointerDownState.segmentMidpoint.added
        ) {
          return;
        }

        const didDrag = LinearElementEditor.handlePointDragging(
          event,
          this.state,
          pointerCoords.x,
          pointerCoords.y,
          (element, pointsSceneCoords) => {
            this.maybeSuggestBindingsForLinearElementAtCoords(
              element,
              pointsSceneCoords,
            );
          },
          linearElementEditor,
        );
        if (didDrag) {
          pointerDownState.lastCoords.x = pointerCoords.x;
          pointerDownState.lastCoords.y = pointerCoords.y;
          pointerDownState.drag.hasOccurred = true;
          if (
            this.state.editingLinearElement &&
            !this.state.editingLinearElement.isDragging
          ) {
            this.setState({
              editingLinearElement: {
                ...this.state.editingLinearElement,
                isDragging: true,
              },
            });
          }
          if (!this.state.selectedLinearElement.isDragging) {
            this.setState({
              selectedLinearElement: {
                ...this.state.selectedLinearElement,
                isDragging: true,
              },
            });
          }
          return;
        }
      }

      const hasHitASelectedElement = pointerDownState.hit.allHitElements.some(
        (element) => this.isASelectedElement(element),
      );

      const isSelectingPointsInLineEditor =
        this.state.editingLinearElement &&
        event.shiftKey &&
        this.state.editingLinearElement.elementId ===
          pointerDownState.hit.element?.id;
      if (
        (hasHitASelectedElement ||
          pointerDownState.hit.hasHitCommonBoundingBoxOfSelectedElements) &&
        !isSelectingPointsInLineEditor
      ) {
        const selectedElements = this.scene.getSelectedElements(this.state);

        if (selectedElements.every((element) => element.locked)) {
          return;
        }

        const selectedElementsHasAFrame = selectedElements.find((e) =>
          isFrameElement(e),
        );
        const topLayerFrame = this.getTopLayerFrameAtSceneCoords(pointerCoords);
        this.setState({
          frameToHighlight:
            topLayerFrame && !selectedElementsHasAFrame ? topLayerFrame : null,
        });

        // Marking that click was used for dragging to check
        // if elements should be deselected on pointerup
        pointerDownState.drag.hasOccurred = true;
        this.setState({
          selectedElementsAreBeingDragged: true,
        });
        // prevent dragging even if we're no longer holding cmd/ctrl otherwise
        // it would have weird results (stuff jumping all over the screen)
        // Checking for editingElement to avoid jump while editing on mobile #6503
        if (
          selectedElements.length > 0 &&
          !pointerDownState.withCmdOrCtrl &&
          !this.state.editingElement &&
          this.state.activeEmbeddable?.state !== "active"
        ) {
          const dragOffset = {
            x: pointerCoords.x - pointerDownState.origin.x,
            y: pointerCoords.y - pointerDownState.origin.y,
          };

          const originalElements = [
            ...pointerDownState.originalElements.values(),
          ];

          // We only drag in one direction if shift is pressed
          const lockDirection = event.shiftKey;

          if (lockDirection) {
            const distanceX = Math.abs(dragOffset.x);
            const distanceY = Math.abs(dragOffset.y);

            const lockX = lockDirection && distanceX < distanceY;
            const lockY = lockDirection && distanceX > distanceY;

            if (lockX) {
              dragOffset.x = 0;
            }

            if (lockY) {
              dragOffset.y = 0;
            }
          }

          // Snap cache *must* be synchronously popuplated before initial drag,
          // otherwise the first drag even will not snap, causing a jump before
          // it snaps to its position if previously snapped already.
          this.maybeCacheVisibleGaps(event, selectedElements);
          this.maybeCacheReferenceSnapPoints(event, selectedElements);

          const { snapOffset, snapLines } = snapDraggedElements(
            getSelectedElements(originalElements, this.state),
            dragOffset,
            this.state,
            event,
          );

          this.setState({ snapLines });

          // when we're editing the name of a frame, we want the user to be
          // able to select and interact with the text input
          !this.state.editingFrame &&
            dragSelectedElements(
              pointerDownState,
              selectedElements,
              dragOffset,
              this.state,
              this.scene,
              snapOffset,
              event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
            );

          this.maybeSuggestBindingForAll(selectedElements);

          // We duplicate the selected element if alt is pressed on pointer move
          if (event.altKey && !pointerDownState.hit.hasBeenDuplicated) {
            // Move the currently selected elements to the top of the z index stack, and
            // put the duplicates where the selected elements used to be.
            // (the origin point where the dragging started)

            pointerDownState.hit.hasBeenDuplicated = true;

            const nextElements = [];
            const elementsToAppend = [];
            const groupIdMap = new Map();
            const oldIdToDuplicatedId = new Map();
            const hitElement = pointerDownState.hit.element;
            const selectedElementIds = new Set(
              this.scene
                .getSelectedElements({
                  selectedElementIds: this.state.selectedElementIds,
                  includeBoundTextElement: true,
                  includeElementsInFrames: true,
                })
                .map((element) => element.id),
            );

            const elements = this.scene.getElementsIncludingDeleted();

            for (const element of elements) {
              if (
                selectedElementIds.has(element.id) ||
                // case: the state.selectedElementIds might not have been
                // updated yet by the time this mousemove event is fired
                (element.id === hitElement?.id &&
                  pointerDownState.hit.wasAddedToSelection)
              ) {
                const duplicatedElement = duplicateElement(
                  this.state.editingGroupId,
                  groupIdMap,
                  element,
                );
                const origElement = pointerDownState.originalElements.get(
                  element.id,
                )!;
                mutateElement(duplicatedElement, {
                  x: origElement.x,
                  y: origElement.y,
                });

                // put duplicated element to pointerDownState.originalElements
                // so that we can snap to the duplicated element without releasing
                pointerDownState.originalElements.set(
                  duplicatedElement.id,
                  duplicatedElement,
                );

                nextElements.push(duplicatedElement);
                elementsToAppend.push(element);
                oldIdToDuplicatedId.set(element.id, duplicatedElement.id);
              } else {
                nextElements.push(element);
              }
            }
            const nextSceneElements = [...nextElements, ...elementsToAppend];
            bindTextToShapeAfterDuplication(
              nextElements,
              elementsToAppend,
              oldIdToDuplicatedId,
            );
            fixBindingsAfterDuplication(
              nextSceneElements,
              elementsToAppend,
              oldIdToDuplicatedId,
              "duplicatesServeAsOld",
            );
            bindElementsToFramesAfterDuplication(
              nextSceneElements,
              elementsToAppend,
              oldIdToDuplicatedId,
            );
            this.scene.replaceAllElements(nextSceneElements);
            this.maybeCacheVisibleGaps(event, selectedElements, true);
            this.maybeCacheReferenceSnapPoints(event, selectedElements, true);
          }
          return;
        }
      }

      // It is very important to read this.state within each move event,
      // otherwise we would read a stale one!
      const draggingElement = this.state.draggingElement;
      if (!draggingElement) {
        return;
      }

      if (draggingElement.type === "freedraw") {
        const points = draggingElement.points;
        const dx = pointerCoords.x - draggingElement.x;
        const dy = pointerCoords.y - draggingElement.y;

        const lastPoint = points.length > 0 && points[points.length - 1];
        const discardPoint =
          lastPoint && lastPoint[0] === dx && lastPoint[1] === dy;

        if (!discardPoint) {
          const pressures = draggingElement.simulatePressure
            ? draggingElement.pressures
            : [...draggingElement.pressures, event.pressure];

          mutateElement(draggingElement, {
            points: [...points, [dx, dy]],
            pressures,
          });
        }
      } else if (isLinearElement(draggingElement)) {
        pointerDownState.drag.hasOccurred = true;
        this.setState({
          selectedElementsAreBeingDragged: true,
        });
        const points = draggingElement.points;
        let dx = gridX - draggingElement.x;
        let dy = gridY - draggingElement.y;

        if (shouldRotateWithDiscreteAngle(event) && points.length === 2) {
          ({ width: dx, height: dy } = getLockedLinearCursorAlignSize(
            draggingElement.x,
            draggingElement.y,
            pointerCoords.x,
            pointerCoords.y,
          ));
        }

        if (points.length === 1) {
          mutateElement(draggingElement, {
            points: [...points, [dx, dy]],
          });
        } else if (points.length === 2) {
          mutateElement(draggingElement, {
            points: [...points.slice(0, -1), [dx, dy]],
          });
        }

        if (isBindingElement(draggingElement, false)) {
          // When creating a linear element by dragging
          this.maybeSuggestBindingsForLinearElementAtCoords(
            draggingElement,
            [pointerCoords],
            this.state.startBoundElement,
          );
        }
      } else {
        pointerDownState.lastCoords.x = pointerCoords.x;
        pointerDownState.lastCoords.y = pointerCoords.y;
        this.maybeDragNewGenericElement(pointerDownState, event);
      }

      if (this.state.activeTool.type === "selection") {
        pointerDownState.boxSelection.hasOccurred = true;

        const elements = this.scene.getNonDeletedElements();

        // box-select line editor points
        if (this.state.editingLinearElement) {
          LinearElementEditor.handleBoxSelection(
            event,
            this.state,
            this.setState.bind(this),
          );
          // regular box-select
        } else {
          let shouldReuseSelection = true;

          if (!event.shiftKey && isSomeElementSelected(elements, this.state)) {
            if (
              pointerDownState.withCmdOrCtrl &&
              pointerDownState.hit.element
            ) {
              this.setState((prevState) =>
                selectGroupsForSelectedElements(
                  {
                    ...prevState,
                    selectedElementIds: {
                      [pointerDownState.hit.element!.id]: true,
                    },
                  },
                  this.scene.getNonDeletedElements(),
                  prevState,
                  this,
                ),
              );
            } else {
              shouldReuseSelection = false;
            }
          }
          const elementsWithinSelection = getElementsWithinSelection(
            elements,
            draggingElement,
          );

          this.setState((prevState) => {
            const nextSelectedElementIds = {
              ...(shouldReuseSelection && prevState.selectedElementIds),
              ...elementsWithinSelection.reduce(
                (acc: Record<ExcalidrawElement["id"], true>, element) => {
                  acc[element.id] = true;
                  return acc;
                },
                {},
              ),
            };

            if (pointerDownState.hit.element) {
              // if using ctrl/cmd, select the hitElement only if we
              // haven't box-selected anything else
              if (!elementsWithinSelection.length) {
                nextSelectedElementIds[pointerDownState.hit.element.id] = true;
              } else {
                delete nextSelectedElementIds[pointerDownState.hit.element.id];
              }
            }

            prevState = !shouldReuseSelection
              ? { ...prevState, selectedGroupIds: {}, editingGroupId: null }
              : prevState;

            return {
              ...selectGroupsForSelectedElements(
                {
                  editingGroupId: prevState.editingGroupId,
                  selectedElementIds: nextSelectedElementIds,
                },
                this.scene.getNonDeletedElements(),
                prevState,
                this,
              ),
              // select linear element only when we haven't box-selected anything else
              selectedLinearElement:
                elementsWithinSelection.length === 1 &&
                isLinearElement(elementsWithinSelection[0])
                  ? new LinearElementEditor(
                      elementsWithinSelection[0],
                      this.scene,
                    )
                  : null,
              showHyperlinkPopup:
                elementsWithinSelection.length === 1 &&
                (elementsWithinSelection[0].link ||
                  isEmbeddableElement(elementsWithinSelection[0]))
                  ? "info"
                  : false,
            };
          });
        }
      }
    });
  }

  // Returns whether the pointer move happened over either scrollbar
  private handlePointerMoveOverScrollbars(
    event: PointerEvent,
    pointerDownState: PointerDownState,
  ): boolean {
    if (pointerDownState.scrollbars.isOverHorizontal) {
      const x = event.clientX;
      const dx = x - pointerDownState.lastCoords.x;
      this.translateCanvas({
        scrollX: this.state.scrollX - dx / this.state.zoom.value,
      });
      pointerDownState.lastCoords.x = x;
      return true;
    }

    if (pointerDownState.scrollbars.isOverVertical) {
      const y = event.clientY;
      const dy = y - pointerDownState.lastCoords.y;
      this.translateCanvas({
        scrollY: this.state.scrollY - dy / this.state.zoom.value,
      });
      pointerDownState.lastCoords.y = y;
      return true;
    }
    return false;
  }

  private onPointerUpFromPointerDownHandler(
    pointerDownState: PointerDownState,
  ): (event: PointerEvent) => void {
    return withBatchedUpdates((childEvent: PointerEvent) => {
      if (pointerDownState.eventListeners.onMove) {
        pointerDownState.eventListeners.onMove.flush();
      }
      const {
        draggingElement,
        resizingElement,
        multiElement,
        activeTool,
        isResizing,
        isRotating,
      } = this.state;

      this.setState({
        isResizing: false,
        isRotating: false,
        resizingElement: null,
        selectionElement: null,
        frameToHighlight: null,
        elementsToHighlight: null,
        cursorButton: "up",
        // text elements are reset on finalize, and resetting on pointerup
        // may cause issues with double taps
        editingElement:
          multiElement || isTextElement(this.state.editingElement)
            ? this.state.editingElement
            : null,
        snapLines: [],

        originSnapOffset: null,
      });

      SnapCache.setReferenceSnapPoints(null);
      SnapCache.setVisibleGaps(null);

      this.savePointer(childEvent.clientX, childEvent.clientY, "up");

      this.setState({
        selectedElementsAreBeingDragged: false,
      });

      // Handle end of dragging a point of a linear element, might close a loop
      // and sets binding element
      if (this.state.editingLinearElement) {
        if (
          !pointerDownState.boxSelection.hasOccurred &&
          pointerDownState.hit?.element?.id !==
            this.state.editingLinearElement.elementId
        ) {
          this.actionManager.executeAction(actionFinalize);
        } else {
          const editingLinearElement = LinearElementEditor.handlePointerUp(
            childEvent,
            this.state.editingLinearElement,
            this.state,
          );
          if (editingLinearElement !== this.state.editingLinearElement) {
            this.setState({
              editingLinearElement,
              suggestedBindings: [],
            });
          }
        }
      } else if (this.state.selectedLinearElement) {
        if (
          pointerDownState.hit?.element?.id !==
          this.state.selectedLinearElement.elementId
        ) {
          const selectedELements = this.scene.getSelectedElements(this.state);
          // set selectedLinearElement to null if there is more than one element selected since we don't want to show linear element handles
          if (selectedELements.length > 1) {
            this.setState({ selectedLinearElement: null });
          }
        } else {
          const linearElementEditor = LinearElementEditor.handlePointerUp(
            childEvent,
            this.state.selectedLinearElement,
            this.state,
          );

          const { startBindingElement, endBindingElement } =
            linearElementEditor;
          const element = this.scene.getElement(linearElementEditor.elementId);
          if (isBindingElement(element)) {
            bindOrUnbindLinearElement(
              element,
              startBindingElement,
              endBindingElement,
            );
          }

          if (linearElementEditor !== this.state.selectedLinearElement) {
            this.setState({
              selectedLinearElement: {
                ...linearElementEditor,
                selectedPointsIndices: null,
              },
              suggestedBindings: [],
            });
          }
        }
      }

      lastPointerUp = null;

      window.removeEventListener(
        EVENT.POINTER_MOVE,
        pointerDownState.eventListeners.onMove!,
      );
      window.removeEventListener(
        EVENT.POINTER_UP,
        pointerDownState.eventListeners.onUp!,
      );
      window.removeEventListener(
        EVENT.KEYDOWN,
        pointerDownState.eventListeners.onKeyDown!,
      );
      window.removeEventListener(
        EVENT.KEYUP,
        pointerDownState.eventListeners.onKeyUp!,
      );

      if (this.state.pendingImageElementId) {
        this.setState({ pendingImageElementId: null });
      }

      this.onPointerUpEmitter.trigger(
        this.state.activeTool,
        pointerDownState,
        childEvent,
      );

      if (draggingElement?.type === "freedraw") {
        const pointerCoords = viewportCoordsToSceneCoords(
          childEvent,
          this.state,
        );

        const points = draggingElement.points;
        let dx = pointerCoords.x - draggingElement.x;
        let dy = pointerCoords.y - draggingElement.y;

        // Allows dots to avoid being flagged as infinitely small
        if (dx === points[0][0] && dy === points[0][1]) {
          dy += 0.0001;
          dx += 0.0001;
        }

        const pressures = draggingElement.simulatePressure
          ? []
          : [...draggingElement.pressures, childEvent.pressure];

        mutateElement(draggingElement, {
          points: [...points, [dx, dy]],
          pressures,
          lastCommittedPoint: [dx, dy],
        });

        this.actionManager.executeAction(actionFinalize);

        return;
      }
      if (isImageElement(draggingElement)) {
        const imageElement = draggingElement;
        try {
          this.initializeImageDimensions(imageElement);
          this.setState(
            {
              selectedElementIds: makeNextSelectedElementIds(
                { [imageElement.id]: true },
                this.state,
              ),
            },
            () => {
              this.actionManager.executeAction(actionFinalize);
            },
          );
        } catch (error: any) {
          console.error(error);
          this.scene.replaceAllElements(
            this.scene
              .getElementsIncludingDeleted()
              .filter((el) => el.id !== imageElement.id),
          );
          this.actionManager.executeAction(actionFinalize);
        }
        return;
      }

      if (isLinearElement(draggingElement)) {
        if (draggingElement!.points.length > 1) {
          this.history.resumeRecording();
        }
        const pointerCoords = viewportCoordsToSceneCoords(
          childEvent,
          this.state,
        );

        if (
          !pointerDownState.drag.hasOccurred &&
          draggingElement &&
          !multiElement
        ) {
          mutateElement(draggingElement, {
            points: [
              ...draggingElement.points,
              [
                pointerCoords.x - draggingElement.x,
                pointerCoords.y - draggingElement.y,
              ],
            ],
          });
          this.setState({
            multiElement: draggingElement,
            editingElement: this.state.draggingElement,
          });
        } else if (pointerDownState.drag.hasOccurred && !multiElement) {
          if (
            isBindingEnabled(this.state) &&
            isBindingElement(draggingElement, false)
          ) {
            maybeBindLinearElement(
              draggingElement,
              this.state,
              this.scene,
              pointerCoords,
            );
          }
          this.setState({ suggestedBindings: [], startBoundElement: null });
          if (!activeTool.locked) {
            resetCursor(this.interactiveCanvas);
            this.setState((prevState) => ({
              draggingElement: null,
              activeTool: updateActiveTool(this.state, {
                type: "selection",
              }),
              selectedElementIds: makeNextSelectedElementIds(
                {
                  ...prevState.selectedElementIds,
                  [draggingElement.id]: true,
                },
                prevState,
              ),
              selectedLinearElement: new LinearElementEditor(
                draggingElement,
                this.scene,
              ),
            }));
          } else {
            this.setState((prevState) => ({
              draggingElement: null,
            }));
          }
        }
        return;
      }

      if (
        activeTool.type !== "selection" &&
        draggingElement &&
        isInvisiblySmallElement(draggingElement)
      ) {
        // remove invisible element which was added in onPointerDown
        this.scene.replaceAllElements(
          this.scene
            .getElementsIncludingDeleted()
            .filter((el) => el.id !== draggingElement.id),
        );
        this.setState({
          draggingElement: null,
        });
        return;
      }

      if (draggingElement) {
        if (pointerDownState.drag.hasOccurred) {
          const sceneCoords = viewportCoordsToSceneCoords(
            childEvent,
            this.state,
          );

          // when editing the points of a linear element, we check if the
          // linear element still is in the frame afterwards
          // if not, the linear element will be removed from its frame (if any)
          if (
            this.state.selectedLinearElement &&
            this.state.selectedLinearElement.isDragging
          ) {
            const linearElement = this.scene.getElement(
              this.state.selectedLinearElement.elementId,
            );

            if (linearElement?.frameId) {
              const frame = getContainingFrame(linearElement);

              if (frame && linearElement) {
                if (!elementOverlapsWithFrame(linearElement, frame)) {
                  // remove the linear element from all groups
                  // before removing it from the frame as well
                  mutateElement(linearElement, {
                    groupIds: [],
                  });

                  this.scene.replaceAllElements(
                    removeElementsFromFrame(
                      this.scene.getElementsIncludingDeleted(),
                      [linearElement],
                      this.state,
                    ),
                  );
                }
              }
            }
          } else {
            // update the relationships between selected elements and frames
            const topLayerFrame =
              this.getTopLayerFrameAtSceneCoords(sceneCoords);

            const selectedElements = this.scene.getSelectedElements(this.state);
            let nextElements = this.scene.getElementsIncludingDeleted();

            const updateGroupIdsAfterEditingGroup = (
              elements: ExcalidrawElement[],
            ) => {
              if (elements.length > 0) {
                for (const element of elements) {
                  const index = element.groupIds.indexOf(
                    this.state.editingGroupId!,
                  );

                  mutateElement(
                    element,
                    {
                      groupIds: element.groupIds.slice(0, index),
                    },
                    false,
                  );
                }

                nextElements.forEach((element) => {
                  if (
                    element.groupIds.length &&
                    getElementsInGroup(
                      nextElements,
                      element.groupIds[element.groupIds.length - 1],
                    ).length < 2
                  ) {
                    mutateElement(
                      element,
                      {
                        groupIds: [],
                      },
                      false,
                    );
                  }
                });

                this.setState({
                  editingGroupId: null,
                });
              }
            };

            if (
              topLayerFrame &&
              !this.state.selectedElementIds[topLayerFrame.id]
            ) {
              const elementsToAdd = selectedElements.filter(
                (element) =>
                  element.frameId !== topLayerFrame.id &&
                  isElementInFrame(element, nextElements, this.state),
              );

              if (this.state.editingGroupId) {
                updateGroupIdsAfterEditingGroup(elementsToAdd);
              }

              nextElements = addElementsToFrame(
                nextElements,
                elementsToAdd,
                topLayerFrame,
              );
            } else if (!topLayerFrame) {
              if (this.state.editingGroupId) {
                const elementsToRemove = selectedElements.filter(
                  (element) =>
                    element.frameId &&
                    !isElementInFrame(element, nextElements, this.state),
                );

                updateGroupIdsAfterEditingGroup(elementsToRemove);
              }
            }

            nextElements = updateFrameMembershipOfSelectedElements(
              nextElements,
              this.state,
              this,
            );

            this.scene.replaceAllElements(nextElements);
          }
        }

        if (draggingElement.type === "frame") {
          const elementsInsideFrame = getElementsInNewFrame(
            this.scene.getElementsIncludingDeleted(),
            draggingElement,
          );

          this.scene.replaceAllElements(
            addElementsToFrame(
              this.scene.getElementsIncludingDeleted(),
              elementsInsideFrame,
              draggingElement,
            ),
          );
        }

        mutateElement(
          draggingElement,
          getNormalizedDimensions(draggingElement),
        );
      }

      if (resizingElement) {
        this.history.resumeRecording();
      }

      if (resizingElement && isInvisiblySmallElement(resizingElement)) {
        this.scene.replaceAllElements(
          this.scene
            .getElementsIncludingDeleted()
            .filter((el) => el.id !== resizingElement.id),
        );
      }

      // handle frame membership for resizing frames and/or selected elements
      if (pointerDownState.resize.isResizing) {
        let nextElements = updateFrameMembershipOfSelectedElements(
          this.scene.getElementsIncludingDeleted(),
          this.state,
          this,
        );

        const selectedFrames = this.scene
          .getSelectedElements(this.state)
          .filter(
            (element) => element.type === "frame",
          ) as ExcalidrawFrameElement[];

        for (const frame of selectedFrames) {
          nextElements = replaceAllElementsInFrame(
            nextElements,
            getElementsInResizingFrame(
              this.scene.getElementsIncludingDeleted(),
              frame,
              this.state,
            ),
            frame,
            this.state,
          );
        }

        this.scene.replaceAllElements(nextElements);
      }

      // Code below handles selection when element(s) weren't
      // drag or added to selection on pointer down phase.
      const hitElement = pointerDownState.hit.element;
      if (
        this.state.selectedLinearElement?.elementId !== hitElement?.id &&
        isLinearElement(hitElement)
      ) {
        const selectedELements = this.scene.getSelectedElements(this.state);
        // set selectedLinearElement when no other element selected except
        // the one we've hit
        if (selectedELements.length === 1) {
          this.setState({
            selectedLinearElement: new LinearElementEditor(
              hitElement,
              this.scene,
            ),
          });
        }
      }
      if (isEraserActive(this.state)) {
        const draggedDistance = distance2d(
          this.lastPointerDownEvent!.clientX,
          this.lastPointerDownEvent!.clientY,
          this.lastPointerUpEvent!.clientX,
          this.lastPointerUpEvent!.clientY,
        );

        if (draggedDistance === 0) {
          const scenePointer = viewportCoordsToSceneCoords(
            {
              clientX: this.lastPointerUpEvent!.clientX,
              clientY: this.lastPointerUpEvent!.clientY,
            },
            this.state,
          );
          const hitElements = this.getElementsAtPosition(
            scenePointer.x,
            scenePointer.y,
          );
          hitElements.forEach(
            (hitElement) =>
              (pointerDownState.elementIdsToErase[hitElement.id] = {
                erase: true,
                opacity: hitElement.opacity,
              }),
          );
        }
        this.eraseElements(pointerDownState);
        return;
      } else if (Object.keys(pointerDownState.elementIdsToErase).length) {
        this.restoreReadyToEraseElements(pointerDownState);
      }

      if (
        hitElement &&
        !pointerDownState.drag.hasOccurred &&
        !pointerDownState.hit.wasAddedToSelection &&
        // if we're editing a line, pointerup shouldn't switch selection if
        // box selected
        (!this.state.editingLinearElement ||
          !pointerDownState.boxSelection.hasOccurred)
      ) {
        // when inside line editor, shift selects points instead
        if (childEvent.shiftKey && !this.state.editingLinearElement) {
          if (this.state.selectedElementIds[hitElement.id]) {
            if (isSelectedViaGroup(this.state, hitElement)) {
              this.setState((_prevState) => {
                const nextSelectedElementIds = {
                  ..._prevState.selectedElementIds,
                };

                // We want to unselect all groups hitElement is part of
                // as well as all elements that are part of the groups
                // hitElement is part of
                for (const groupedElement of hitElement.groupIds.flatMap(
                  (groupId) =>
                    getElementsInGroup(
                      this.scene.getNonDeletedElements(),
                      groupId,
                    ),
                )) {
                  delete nextSelectedElementIds[groupedElement.id];
                }

                return {
                  selectedGroupIds: {
                    ..._prevState.selectedElementIds,
                    ...hitElement.groupIds
                      .map((gId) => ({ [gId]: false }))
                      .reduce((prev, acc) => ({ ...prev, ...acc }), {}),
                  },
                  selectedElementIds: makeNextSelectedElementIds(
                    nextSelectedElementIds,
                    _prevState,
                  ),
                };
              });
              // if not gragging a linear element point (outside editor)
            } else if (!this.state.selectedLinearElement?.isDragging) {
              // remove element from selection while
              // keeping prev elements selected

              this.setState((prevState) => {
                const newSelectedElementIds = {
                  ...prevState.selectedElementIds,
                };
                delete newSelectedElementIds[hitElement!.id];
                const newSelectedElements = getSelectedElements(
                  this.scene.getNonDeletedElements(),
                  { selectedElementIds: newSelectedElementIds },
                );

                return {
                  ...selectGroupsForSelectedElements(
                    {
                      editingGroupId: prevState.editingGroupId,
                      selectedElementIds: newSelectedElementIds,
                    },
                    this.scene.getNonDeletedElements(),
                    prevState,
                    this,
                  ),
                  // set selectedLinearElement only if thats the only element selected
                  selectedLinearElement:
                    newSelectedElements.length === 1 &&
                    isLinearElement(newSelectedElements[0])
                      ? new LinearElementEditor(
                          newSelectedElements[0],
                          this.scene,
                        )
                      : prevState.selectedLinearElement,
                };
              });
            }
          } else if (
            hitElement.frameId &&
            this.state.selectedElementIds[hitElement.frameId]
          ) {
            // when hitElement is part of a selected frame, deselect the frame
            // to avoid frame and containing elements selected simultaneously
            this.setState((prevState) => {
              const nextSelectedElementIds: {
                [id: string]: true;
              } = {
                ...prevState.selectedElementIds,
                [hitElement.id]: true,
              };
              // deselect the frame
              delete nextSelectedElementIds[hitElement.frameId!];

              // deselect groups containing the frame
              (this.scene.getElement(hitElement.frameId!)?.groupIds ?? [])
                .flatMap((gid) =>
                  getElementsInGroup(this.scene.getNonDeletedElements(), gid),
                )
                .forEach((element) => {
                  delete nextSelectedElementIds[element.id];
                });

              return {
                ...selectGroupsForSelectedElements(
                  {
                    editingGroupId: prevState.editingGroupId,
                    selectedElementIds: nextSelectedElementIds,
                  },
                  this.scene.getNonDeletedElements(),
                  prevState,
                  this,
                ),
                showHyperlinkPopup:
                  hitElement.link || isEmbeddableElement(hitElement)
                    ? "info"
                    : false,
              };
            });
          } else {
            // add element to selection while keeping prev elements selected
            this.setState((_prevState) => ({
              selectedElementIds: makeNextSelectedElementIds(
                {
                  ..._prevState.selectedElementIds,
                  [hitElement!.id]: true,
                },
                _prevState,
              ),
            }));
          }
        } else {
          this.setState((prevState) => ({
            ...selectGroupsForSelectedElements(
              {
                editingGroupId: prevState.editingGroupId,
                selectedElementIds: { [hitElement.id]: true },
              },
              this.scene.getNonDeletedElements(),
              prevState,
              this,
            ),
            selectedLinearElement:
              isLinearElement(hitElement) &&
              // Don't set `selectedLinearElement` if its same as the hitElement, this is mainly to prevent resetting the `hoverPointIndex` to -1.
              // Future we should update the API to take care of setting the correct `hoverPointIndex` when initialized
              prevState.selectedLinearElement?.elementId !== hitElement.id
                ? new LinearElementEditor(hitElement, this.scene)
                : prevState.selectedLinearElement,
          }));
        }
      }

      if (
        !pointerDownState.drag.hasOccurred &&
        !this.state.isResizing &&
        ((hitElement &&
          isHittingElementBoundingBoxWithoutHittingElement(
            hitElement,
            this.state,
            this.frameNameBoundsCache,
            pointerDownState.origin.x,
            pointerDownState.origin.y,
          )) ||
          (!hitElement &&
            pointerDownState.hit.hasHitCommonBoundingBoxOfSelectedElements))
      ) {
        if (this.state.editingLinearElement) {
          this.setState({ editingLinearElement: null });
        } else {
          // Deselect selected elements
          this.setState({
            selectedElementIds: makeNextSelectedElementIds({}, this.state),
            selectedGroupIds: {},
            editingGroupId: null,
            activeEmbeddable: null,
          });
        }
        return;
      }

      if (
        !activeTool.locked &&
        activeTool.type !== "freedraw" &&
        draggingElement &&
        draggingElement.type !== "selection"
      ) {
        this.setState((prevState) => ({
          selectedElementIds: makeNextSelectedElementIds(
            {
              ...prevState.selectedElementIds,
              [draggingElement.id]: true,
            },
            prevState,
          ),
          showHyperlinkPopup:
            isEmbeddableElement(draggingElement) && !draggingElement.link
              ? "editor"
              : prevState.showHyperlinkPopup,
        }));
      }

      if (
        activeTool.type !== "selection" ||
        isSomeElementSelected(this.scene.getNonDeletedElements(), this.state)
      ) {
        this.history.resumeRecording();
      }

      if (pointerDownState.drag.hasOccurred || isResizing || isRotating) {
        (isBindingEnabled(this.state)
          ? bindOrUnbindSelectedElements
          : unbindLinearElements)(this.scene.getSelectedElements(this.state));
      }

      if (activeTool.type === "laser") {
        this.laserPathManager.endPath();
        return;
      }

      if (!activeTool.locked && activeTool.type !== "freedraw") {
        resetCursor(this.interactiveCanvas);
        this.setState({
          draggingElement: null,
          suggestedBindings: [],
          activeTool: updateActiveTool(this.state, { type: "selection" }),
        });
      } else {
        this.setState({
          draggingElement: null,
          suggestedBindings: [],
        });
      }

      if (
        hitElement &&
        this.lastPointerUpEvent &&
        this.lastPointerDownEvent &&
        this.lastPointerUpEvent.timeStamp -
          this.lastPointerDownEvent.timeStamp <
          300 &&
        gesture.pointers.size <= 1 &&
        isEmbeddableElement(hitElement) &&
        this.isEmbeddableCenter(
          hitElement,
          this.lastPointerUpEvent,
          pointerDownState.origin.x,
          pointerDownState.origin.y,
        )
      ) {
        this.handleEmbeddableCenterClick(hitElement);
      }
    });
  }

  private restoreReadyToEraseElements = (
    pointerDownState: PointerDownState,
  ) => {
    const elements = this.scene.getElementsIncludingDeleted().map((ele) => {
      if (
        pointerDownState.elementIdsToErase[ele.id] &&
        pointerDownState.elementIdsToErase[ele.id].erase
      ) {
        return newElementWith(ele, {
          opacity: pointerDownState.elementIdsToErase[ele.id].opacity,
        });
      } else if (
        isBoundToContainer(ele) &&
        pointerDownState.elementIdsToErase[ele.containerId] &&
        pointerDownState.elementIdsToErase[ele.containerId].erase
      ) {
        return newElementWith(ele, {
          opacity: pointerDownState.elementIdsToErase[ele.containerId].opacity,
        });
      } else if (
        ele.frameId &&
        pointerDownState.elementIdsToErase[ele.frameId] &&
        pointerDownState.elementIdsToErase[ele.frameId].erase
      ) {
        return newElementWith(ele, {
          opacity: pointerDownState.elementIdsToErase[ele.frameId].opacity,
        });
      }
      return ele;
    });

    this.scene.replaceAllElements(elements);
  };

  private eraseElements = (pointerDownState: PointerDownState) => {
    const elements = this.scene.getElementsIncludingDeleted().map((ele) => {
      if (
        pointerDownState.elementIdsToErase[ele.id] &&
        pointerDownState.elementIdsToErase[ele.id].erase
      ) {
        return newElementWith(ele, { isDeleted: true });
      } else if (
        isBoundToContainer(ele) &&
        pointerDownState.elementIdsToErase[ele.containerId] &&
        pointerDownState.elementIdsToErase[ele.containerId].erase
      ) {
        return newElementWith(ele, { isDeleted: true });
      } else if (
        ele.frameId &&
        pointerDownState.elementIdsToErase[ele.frameId] &&
        pointerDownState.elementIdsToErase[ele.frameId].erase
      ) {
        return newElementWith(ele, { isDeleted: true });
      }
      return ele;
    });

    this.history.resumeRecording();
    this.scene.replaceAllElements(elements);
  };

  private initializeImage = async ({
    imageFile,
    imageElement: _imageElement,
    showCursorImagePreview = false,
  }: {
    imageFile: File;
    imageElement: ExcalidrawImageElement;
    showCursorImagePreview?: boolean;
  }) => {
    // at this point this should be guaranteed image file, but we do this check
    // to satisfy TS down the line
    if (!isSupportedImageFile(imageFile)) {
      throw new Error(t("errors.unsupportedFileType"));
    }
    const mimeType = imageFile.type;

    setCursor(this.interactiveCanvas, "wait");

    if (mimeType === MIME_TYPES.svg) {
      try {
        imageFile = SVGStringToFile(
          await normalizeSVG(await imageFile.text()),
          imageFile.name,
        );
      } catch (error: any) {
        console.warn(error);
        throw new Error(t("errors.svgImageInsertError"));
      }
    }

    // generate image id (by default the file digest) before any
    // resizing/compression takes place to keep it more portable
    const fileId = await ((this.props.generateIdForFile?.(
      imageFile,
    ) as Promise<FileId>) || generateIdFromFile(imageFile));

    if (!fileId) {
      console.warn(
        "Couldn't generate file id or the supplied `generateIdForFile` didn't resolve to one.",
      );
      throw new Error(t("errors.imageInsertError"));
    }

    const existingFileData = this.files[fileId];
    if (!existingFileData?.dataURL) {
      try {
        imageFile = await resizeImageFile(imageFile, {
          maxWidthOrHeight: DEFAULT_MAX_IMAGE_WIDTH_OR_HEIGHT,
        });
      } catch (error: any) {
        console.error("error trying to resing image file on insertion", error);
      }

      if (imageFile.size > MAX_ALLOWED_FILE_BYTES) {
        throw new Error(
          t("errors.fileTooBig", {
            maxSize: `${Math.trunc(MAX_ALLOWED_FILE_BYTES / 1024 / 1024)}MB`,
          }),
        );
      }
    }

    if (showCursorImagePreview) {
      const dataURL = this.files[fileId]?.dataURL;
      // optimization so that we don't unnecessarily resize the original
      // full-size file for cursor preview
      // (it's much faster to convert the resized dataURL to File)
      const resizedFile = dataURL && dataURLToFile(dataURL);

      this.setImagePreviewCursor(resizedFile || imageFile);
    }

    const dataURL =
      this.files[fileId]?.dataURL || (await getDataURL(imageFile));

    const imageElement = mutateElement(
      _imageElement,
      {
        fileId,
      },
      false,
    ) as NonDeleted<InitializedExcalidrawImageElement>;

    return new Promise<NonDeleted<InitializedExcalidrawImageElement>>(
      async (resolve, reject) => {
        try {
          this.files = {
            ...this.files,
            [fileId]: {
              mimeType,
              id: fileId,
              dataURL,
              created: Date.now(),
              lastRetrieved: Date.now(),
            },
          };
          const cachedImageData = this.imageCache.get(fileId);
          if (!cachedImageData) {
            this.addNewImagesToImageCache();
            await this.updateImageCache([imageElement]);
          }
          if (cachedImageData?.image instanceof Promise) {
            await cachedImageData.image;
          }
          if (
            this.state.pendingImageElementId !== imageElement.id &&
            this.state.draggingElement?.id !== imageElement.id
          ) {
            this.initializeImageDimensions(imageElement, true);
          }
          resolve(imageElement);
        } catch (error: any) {
          console.error(error);
          reject(new Error(t("errors.imageInsertError")));
        } finally {
          if (!showCursorImagePreview) {
            resetCursor(this.interactiveCanvas);
          }
        }
      },
    );
  };

  /**
   * inserts image into elements array and rerenders
   */
  private insertImageElement = async (
    imageElement: ExcalidrawImageElement,
    imageFile: File,
    showCursorImagePreview?: boolean,
  ) => {
    // we should be handling all cases upstream, but in case we forget to handle
    // a future case, let's throw here
    if (!this.isToolSupported("image")) {
      this.setState({ errorMessage: t("errors.imageToolNotSupported") });
      return;
    }

    this.scene.addNewElement(imageElement);

    try {
      return await this.initializeImage({
        imageFile,
        imageElement,
        showCursorImagePreview,
      });
    } catch (error: any) {
      mutateElement(imageElement, {
        isDeleted: true,
      });
      this.actionManager.executeAction(actionFinalize);
      this.setState({
        errorMessage: error.message || t("errors.imageInsertError"),
      });
      return null;
    }
  };

  private setImagePreviewCursor = async (imageFile: File) => {
    // mustn't be larger than 128 px
    // https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Basic_User_Interface/Using_URL_values_for_the_cursor_property
    const cursorImageSizePx = 96;

    const imagePreview = await resizeImageFile(imageFile, {
      maxWidthOrHeight: cursorImageSizePx,
    });

    let previewDataURL = await getDataURL(imagePreview);

    // SVG cannot be resized via `resizeImageFile` so we resize by rendering to
    // a small canvas
    if (imageFile.type === MIME_TYPES.svg) {
      const img = await loadHTMLImageElement(previewDataURL);

      let height = Math.min(img.height, cursorImageSizePx);
      let width = height * (img.width / img.height);

      if (width > cursorImageSizePx) {
        width = cursorImageSizePx;
        height = width * (img.height / img.width);
      }

      const canvas = document.createElement("canvas");
      canvas.height = height;
      canvas.width = width;
      const context = canvas.getContext("2d")!;

      context.drawImage(img, 0, 0, width, height);

      previewDataURL = canvas.toDataURL(MIME_TYPES.svg) as DataURL;
    }

    if (this.state.pendingImageElementId) {
      setCursor(this.interactiveCanvas, `url(${previewDataURL}) 4 4, auto`);
    }
  };

  private onImageAction = async ({
    insertOnCanvasDirectly,
  }: {
    insertOnCanvasDirectly: boolean;
  }) => {
    try {
      const clientX = this.state.width / 2 + this.state.offsetLeft;
      const clientY = this.state.height / 2 + this.state.offsetTop;

      const { x, y } = viewportCoordsToSceneCoords(
        { clientX, clientY },
        this.state,
      );

      const imageFile = await fileOpen({
        description: "Image",
        extensions: Object.keys(
          IMAGE_MIME_TYPES,
        ) as (keyof typeof IMAGE_MIME_TYPES)[],
      });

      const imageElement = this.createImageElement({
        sceneX: x,
        sceneY: y,
        addToFrameUnderCursor: false,
      });

      if (insertOnCanvasDirectly) {
        this.insertImageElement(imageElement, imageFile);
        this.initializeImageDimensions(imageElement);
        this.setState(
          {
            selectedElementIds: makeNextSelectedElementIds(
              { [imageElement.id]: true },
              this.state,
            ),
          },
          () => {
            this.actionManager.executeAction(actionFinalize);
          },
        );
      } else {
        this.setState(
          {
            pendingImageElementId: imageElement.id,
          },
          () => {
            this.insertImageElement(
              imageElement,
              imageFile,
              /* showCursorImagePreview */ true,
            );
          },
        );
      }
    } catch (error: any) {
      if (error.name !== "AbortError") {
        console.error(error);
      } else {
        console.warn(error);
      }
      this.setState(
        {
          pendingImageElementId: null,
          editingElement: null,
          activeTool: updateActiveTool(this.state, { type: "selection" }),
        },
        () => {
          this.actionManager.executeAction(actionFinalize);
        },
      );
    }
  };

  private initializeImageDimensions = (
    imageElement: ExcalidrawImageElement,
    forceNaturalSize = false,
  ) => {
    const image =
      isInitializedImageElement(imageElement) &&
      this.imageCache.get(imageElement.fileId)?.image;

    if (!image || image instanceof Promise) {
      if (
        imageElement.width < DRAGGING_THRESHOLD / this.state.zoom.value &&
        imageElement.height < DRAGGING_THRESHOLD / this.state.zoom.value
      ) {
        const placeholderSize = 100 / this.state.zoom.value;
        mutateElement(imageElement, {
          x: imageElement.x - placeholderSize / 2,
          y: imageElement.y - placeholderSize / 2,
          width: placeholderSize,
          height: placeholderSize,
        });
      }

      return;
    }

    if (
      forceNaturalSize ||
      // if user-created bounding box is below threshold, assume the
      // intention was to click instead of drag, and use the image's
      // intrinsic size
      (imageElement.width < DRAGGING_THRESHOLD / this.state.zoom.value &&
        imageElement.height < DRAGGING_THRESHOLD / this.state.zoom.value)
    ) {
      const minHeight = Math.max(this.state.height - 120, 160);
      // max 65% of canvas height, clamped to <300px, vh - 120px>
      const maxHeight = Math.min(
        minHeight,
        Math.floor(this.state.height * 0.5) / this.state.zoom.value,
      );

      const height = Math.min(image.naturalHeight, maxHeight);
      const width = height * (image.naturalWidth / image.naturalHeight);

      // add current imageElement width/height to account for previous centering
      // of the placeholder image
      const x = imageElement.x + imageElement.width / 2 - width / 2;
      const y = imageElement.y + imageElement.height / 2 - height / 2;

      mutateElement(imageElement, { x, y, width, height });
    }
  };

  /** updates image cache, refreshing updated elements and/or setting status
      to error for images that fail during <img> element creation */
  private updateImageCache = async (
    elements: readonly InitializedExcalidrawImageElement[],
    files = this.files,
  ) => {
    const { updatedFiles, erroredFiles } = await _updateImageCache({
      imageCache: this.imageCache,
      fileIds: elements.map((element) => element.fileId),
      files,
    });
    if (updatedFiles.size || erroredFiles.size) {
      for (const element of elements) {
        if (updatedFiles.has(element.fileId)) {
          ShapeCache.delete(element);
        }
      }
    }
    if (erroredFiles.size) {
      this.scene.replaceAllElements(
        this.scene.getElementsIncludingDeleted().map((element) => {
          if (
            isInitializedImageElement(element) &&
            erroredFiles.has(element.fileId)
          ) {
            return newElementWith(element, {
              status: "error",
            });
          }
          return element;
        }),
      );
    }

    return { updatedFiles, erroredFiles };
  };

  /** adds new images to imageCache and re-renders if needed */
  private addNewImagesToImageCache = async (
    imageElements: InitializedExcalidrawImageElement[] = getInitializedImageElements(
      this.scene.getNonDeletedElements(),
    ),
    files: BinaryFiles = this.files,
  ) => {
    const uncachedImageElements = imageElements.filter(
      (element) => !element.isDeleted && !this.imageCache.has(element.fileId),
    );

    if (uncachedImageElements.length) {
      const { updatedFiles } = await this.updateImageCache(
        uncachedImageElements,
        files,
      );
      if (updatedFiles.size) {
        this.scene.informMutation();
      }
    }
  };

  /** generally you should use `addNewImagesToImageCache()` directly if you need
   *  to render new images. This is just a failsafe  */
  private scheduleImageRefresh = throttle(() => {
    this.addNewImagesToImageCache();
  }, IMAGE_RENDER_TIMEOUT);

  private updateBindingEnabledOnPointerMove = (
    event: React.PointerEvent<HTMLElement>,
  ) => {
    const shouldEnableBinding = shouldEnableBindingForPointerEvent(event);
    if (this.state.isBindingEnabled !== shouldEnableBinding) {
      this.setState({ isBindingEnabled: shouldEnableBinding });
    }
  };

  private maybeSuggestBindingAtCursor = (pointerCoords: {
    x: number;
    y: number;
  }): void => {
    const hoveredBindableElement = getHoveredElementForBinding(
      pointerCoords,
      this.scene,
    );
    this.setState({
      suggestedBindings:
        hoveredBindableElement != null ? [hoveredBindableElement] : [],
    });
  };

  private maybeSuggestBindingsForLinearElementAtCoords = (
    linearElement: NonDeleted<ExcalidrawLinearElement>,
    /** scene coords */
    pointerCoords: {
      x: number;
      y: number;
    }[],
    // During line creation the start binding hasn't been written yet
    // into `linearElement`
    oppositeBindingBoundElement?: ExcalidrawBindableElement | null,
  ): void => {
    if (!pointerCoords.length) {
      return;
    }

    const suggestedBindings = pointerCoords.reduce(
      (acc: NonDeleted<ExcalidrawBindableElement>[], coords) => {
        const hoveredBindableElement = getHoveredElementForBinding(
          coords,
          this.scene,
        );
        if (
          hoveredBindableElement != null &&
          !isLinearElementSimpleAndAlreadyBound(
            linearElement,
            oppositeBindingBoundElement?.id,
            hoveredBindableElement,
          )
        ) {
          acc.push(hoveredBindableElement);
        }
        return acc;
      },
      [],
    );

    this.setState({ suggestedBindings });
  };

  private maybeSuggestBindingForAll(
    selectedElements: NonDeleted<ExcalidrawElement>[],
  ): void {
    if (selectedElements.length > 50) {
      return;
    }
    const suggestedBindings = getEligibleElementsForBinding(selectedElements);
    this.setState({ suggestedBindings });
  }

  private clearSelection(hitElement: ExcalidrawElement | null): void {
    this.setState((prevState) => ({
      selectedElementIds: makeNextSelectedElementIds({}, prevState),
      activeEmbeddable: null,
      selectedGroupIds: {},
      // Continue editing the same group if the user selected a different
      // element from it
      editingGroupId:
        prevState.editingGroupId &&
        hitElement != null &&
        isElementInGroup(hitElement, prevState.editingGroupId)
          ? prevState.editingGroupId
          : null,
    }));
    this.setState({
      selectedElementIds: makeNextSelectedElementIds({}, this.state),
      activeEmbeddable: null,
      previousSelectedElementIds: this.state.selectedElementIds,
    });
  }

  private handleInteractiveCanvasRef = (canvas: HTMLCanvasElement | null) => {
    // canvas is null when unmounting
    if (canvas !== null) {
      this.interactiveCanvas = canvas;

      // -----------------------------------------------------------------------
      // NOTE wheel, touchstart, touchend events must be registered outside
      // of react because react binds them them passively (so we can't prevent
      // default on them)
      this.interactiveCanvas.addEventListener(EVENT.WHEEL, this.handleWheel);
      this.interactiveCanvas.addEventListener(
        EVENT.TOUCH_START,
        this.onTouchStart,
      );
      this.interactiveCanvas.addEventListener(EVENT.TOUCH_END, this.onTouchEnd);
      // -----------------------------------------------------------------------
    } else {
      this.interactiveCanvas?.removeEventListener(
        EVENT.WHEEL,
        this.handleWheel,
      );
      this.interactiveCanvas?.removeEventListener(
        EVENT.TOUCH_START,
        this.onTouchStart,
      );
      this.interactiveCanvas?.removeEventListener(
        EVENT.TOUCH_END,
        this.onTouchEnd,
      );
    }
  };

  private handleAppOnDrop = async (event: React.DragEvent<HTMLDivElement>) => {
    // must be retrieved first, in the same frame
    const { file, fileHandle } = await getFileFromEvent(event);
    const { x: sceneX, y: sceneY } = viewportCoordsToSceneCoords(
      event,
      this.state,
    );

    try {
      // if image tool not supported, don't show an error here and let it fall
      // through so we still support importing scene data from images. If no
      // scene data encoded, we'll show an error then
      if (isSupportedImageFile(file) && this.isToolSupported("image")) {
        // first attempt to decode scene from the image if it's embedded
        // ---------------------------------------------------------------------

        if (file?.type === MIME_TYPES.png || file?.type === MIME_TYPES.svg) {
          try {
            const scene = await loadFromBlob(
              file,
              this.state,
              this.scene.getElementsIncludingDeleted(),
              fileHandle,
            );
            this.syncActionResult({
              ...scene,
              appState: {
                ...(scene.appState || this.state),
                isLoading: false,
              },
              replaceFiles: true,
              commitToHistory: true,
            });
            return;
          } catch (error: any) {
            if (error.name !== "EncodingError") {
              throw error;
            }
          }
        }

        // if no scene is embedded or we fail for whatever reason, fall back
        // to importing as regular image
        // ---------------------------------------------------------------------

        const imageElement = this.createImageElement({ sceneX, sceneY });
        this.insertImageElement(imageElement, file);
        this.initializeImageDimensions(imageElement);
        this.setState({
          selectedElementIds: makeNextSelectedElementIds(
            { [imageElement.id]: true },
            this.state,
          ),
        });

        return;
      }
    } catch (error: any) {
      return this.setState({
        isLoading: false,
        errorMessage: error.message,
      });
    }

    const libraryJSON = event.dataTransfer.getData(MIME_TYPES.excalidrawlib);
    if (libraryJSON && typeof libraryJSON === "string") {
      try {
        const libraryItems = parseLibraryJSON(libraryJSON);
        this.addElementsFromPasteOrLibrary({
          elements: distributeLibraryItemsOnSquareGrid(libraryItems),
          position: event,
          files: null,
        });
      } catch (error: any) {
        this.setState({ errorMessage: error.message });
      }
      return;
    }

    if (file) {
      // atetmpt to parse an excalidraw/excalidrawlib file
      await this.loadFileToCanvas(file, fileHandle);
    }

    if (event.dataTransfer?.types?.includes("text/plain")) {
      const text = event.dataTransfer?.getData("text");
      if (
        text &&
        embeddableURLValidator(text, this.props.validateEmbeddable) &&
        (/^(http|https):\/\/[^\s/$.?#].[^\s]*$/.test(text) ||
          getEmbedLink(text)?.type === "video")
      ) {
        const embeddable = this.insertEmbeddableElement({
          sceneX,
          sceneY,
          link: normalizeLink(text),
        });
        if (embeddable) {
          this.setState({ selectedElementIds: { [embeddable.id]: true } });
        }
      }
    }
  };

  loadFileToCanvas = async (
    file: File,
    fileHandle: FileSystemHandle | null,
  ) => {
    file = await normalizeFile(file);
    try {
      const ret = await loadSceneOrLibraryFromBlob(
        file,
        this.state,
        this.scene.getElementsIncludingDeleted(),
        fileHandle,
      );
      if (ret.type === MIME_TYPES.excalidraw) {
        this.setState({ isLoading: true });
        this.syncActionResult({
          ...ret.data,
          appState: {
            ...(ret.data.appState || this.state),
            isLoading: false,
          },
          replaceFiles: true,
          commitToHistory: true,
        });
      } else if (ret.type === MIME_TYPES.excalidrawlib) {
        await this.library
          .updateLibrary({
            libraryItems: file,
            merge: true,
            openLibraryMenu: true,
          })
          .catch((error) => {
            console.error(error);
            this.setState({ errorMessage: t("errors.importLibraryError") });
          });
      }
    } catch (error: any) {
      if (
        error instanceof ImageSceneDataError &&
        error.code === "IMAGE_NOT_CONTAINS_SCENE_DATA" &&
        !this.isToolSupported("image")
      ) {
        this.setState({
          isLoading: false,
          errorMessage: t("errors.imageToolNotSupported"),
        });
        return;
      }
      this.setState({ isLoading: false, errorMessage: error.message });
    }
  };

  private handleCanvasContextMenu = (
    event: React.MouseEvent<HTMLElement | HTMLCanvasElement>,
  ) => {
    event.preventDefault();

    if (
      (("pointerType" in event.nativeEvent &&
        event.nativeEvent.pointerType === "touch") ||
        ("pointerType" in event.nativeEvent &&
          event.nativeEvent.pointerType === "pen" &&
          // always allow if user uses a pen secondary button
          event.button !== POINTER_BUTTON.SECONDARY)) &&
      this.state.activeTool.type !== "selection"
    ) {
      return;
    }

    const { x, y } = viewportCoordsToSceneCoords(event, this.state);
    const element = this.getElementAtPosition(x, y, {
      preferSelected: true,
      includeLockedElements: true,
    });

    const selectedElements = this.scene.getSelectedElements(this.state);
    const isHittignCommonBoundBox =
      this.isHittingCommonBoundingBoxOfSelectedElements(
        { x, y },
        selectedElements,
      );

    const type = element || isHittignCommonBoundBox ? "element" : "canvas";

    const container = this.excalidrawContainerRef.current!;
    const { top: offsetTop, left: offsetLeft } =
      container.getBoundingClientRect();
    const left = event.clientX - offsetLeft;
    const top = event.clientY - offsetTop;

    trackEvent("contextMenu", "openContextMenu", type);

    this.setState(
      {
        ...(element && !this.state.selectedElementIds[element.id]
          ? {
              ...this.state,
              ...selectGroupsForSelectedElements(
                {
                  editingGroupId: this.state.editingGroupId,
                  selectedElementIds: { [element.id]: true },
                },
                this.scene.getNonDeletedElements(),
                this.state,
                this,
              ),
              selectedLinearElement: isLinearElement(element)
                ? new LinearElementEditor(element, this.scene)
                : null,
            }
          : this.state),
        showHyperlinkPopup: false,
      },
      () => {
        this.setState({
          contextMenu: { top, left, items: this.getContextMenuItems(type) },
        });
      },
    );
  };

  private maybeDragNewGenericElement = (
    pointerDownState: PointerDownState,
    event: MouseEvent | KeyboardEvent,
  ): void => {
    const draggingElement = this.state.draggingElement;
    const pointerCoords = pointerDownState.lastCoords;
    if (!draggingElement) {
      return;
    }
    if (
      draggingElement.type === "selection" &&
      this.state.activeTool.type !== "eraser"
    ) {
      dragNewElement(
        draggingElement,
        this.state.activeTool.type,
        pointerDownState.origin.x,
        pointerDownState.origin.y,
        pointerCoords.x,
        pointerCoords.y,
        distance(pointerDownState.origin.x, pointerCoords.x),
        distance(pointerDownState.origin.y, pointerCoords.y),
        shouldMaintainAspectRatio(event),
        shouldResizeFromCenter(event),
      );
    } else {
      let [gridX, gridY] = getGridPoint(
        pointerCoords.x,
        pointerCoords.y,
        event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
      );

      const image =
        isInitializedImageElement(draggingElement) &&
        this.imageCache.get(draggingElement.fileId)?.image;
      const aspectRatio =
        image && !(image instanceof Promise)
          ? image.width / image.height
          : null;

      this.maybeCacheReferenceSnapPoints(event, [draggingElement]);

      const { snapOffset, snapLines } = snapNewElement(
        draggingElement,
        this.state,
        event,
        {
          x:
            pointerDownState.originInGrid.x +
            (this.state.originSnapOffset?.x ?? 0),
          y:
            pointerDownState.originInGrid.y +
            (this.state.originSnapOffset?.y ?? 0),
        },
        {
          x: gridX - pointerDownState.originInGrid.x,
          y: gridY - pointerDownState.originInGrid.y,
        },
      );

      gridX += snapOffset.x;
      gridY += snapOffset.y;

      this.setState({
        snapLines,
      });

      dragNewElement(
        draggingElement,
        this.state.activeTool.type,
        pointerDownState.originInGrid.x,
        pointerDownState.originInGrid.y,
        gridX,
        gridY,
        distance(pointerDownState.originInGrid.x, gridX),
        distance(pointerDownState.originInGrid.y, gridY),
        isImageElement(draggingElement)
          ? !shouldMaintainAspectRatio(event)
          : shouldMaintainAspectRatio(event),
        shouldResizeFromCenter(event),
        aspectRatio,
        this.state.originSnapOffset,
      );

      this.maybeSuggestBindingForAll([draggingElement]);

      // highlight elements that are to be added to frames on frames creation
      if (this.state.activeTool.type === "frame") {
        this.setState({
          elementsToHighlight: getElementsInResizingFrame(
            this.scene.getNonDeletedElements(),
            draggingElement as ExcalidrawFrameElement,
            this.state,
          ),
        });
      }
    }
  };

  private maybeHandleResize = (
    pointerDownState: PointerDownState,
    event: MouseEvent | KeyboardEvent,
  ): boolean => {
    const selectedElements = this.scene.getSelectedElements(this.state);
    const selectedFrames = selectedElements.filter(
      (element) => element.type === "frame",
    ) as ExcalidrawFrameElement[];

    const transformHandleType = pointerDownState.resize.handleType;

    if (selectedFrames.length > 0 && transformHandleType === "rotation") {
      return false;
    }

    this.setState({
      // TODO: rename this state field to "isScaling" to distinguish
      // it from the generic "isResizing" which includes scaling and
      // rotating
      isResizing: transformHandleType && transformHandleType !== "rotation",
      isRotating: transformHandleType === "rotation",
      activeEmbeddable: null,
    });
    const pointerCoords = pointerDownState.lastCoords;
    let [resizeX, resizeY] = getGridPoint(
      pointerCoords.x - pointerDownState.resize.offset.x,
      pointerCoords.y - pointerDownState.resize.offset.y,
      event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
    );

    const frameElementsOffsetsMap = new Map<
      string,
      {
        x: number;
        y: number;
      }
    >();

    selectedFrames.forEach((frame) => {
      const elementsInFrame = getFrameChildren(
        this.scene.getNonDeletedElements(),
        frame.id,
      );

      elementsInFrame.forEach((element) => {
        frameElementsOffsetsMap.set(frame.id + element.id, {
          x: element.x - frame.x,
          y: element.y - frame.y,
        });
      });
    });

    // check needed for avoiding flickering when a key gets pressed
    // during dragging
    if (!this.state.selectedElementsAreBeingDragged) {
      const [gridX, gridY] = getGridPoint(
        pointerCoords.x,
        pointerCoords.y,
        event[KEYS.CTRL_OR_CMD] ? null : this.state.gridSize,
      );

      const dragOffset = {
        x: gridX - pointerDownState.originInGrid.x,
        y: gridY - pointerDownState.originInGrid.y,
      };

      const originalElements = [...pointerDownState.originalElements.values()];

      this.maybeCacheReferenceSnapPoints(event, selectedElements);

      const { snapOffset, snapLines } = snapResizingElements(
        selectedElements,
        getSelectedElements(originalElements, this.state),
        this.state,
        event,
        dragOffset,
        transformHandleType,
      );

      resizeX += snapOffset.x;
      resizeY += snapOffset.y;

      this.setState({
        snapLines,
      });
    }

    if (
      transformElements(
        pointerDownState,
        transformHandleType,
        selectedElements,
        pointerDownState.resize.arrowDirection,
        shouldRotateWithDiscreteAngle(event),
        shouldResizeFromCenter(event),
        selectedElements.length === 1 && isImageElement(selectedElements[0])
          ? !shouldMaintainAspectRatio(event)
          : shouldMaintainAspectRatio(event),
        resizeX,
        resizeY,
        pointerDownState.resize.center.x,
        pointerDownState.resize.center.y,
        this.state,
      )
    ) {
      this.maybeSuggestBindingForAll(selectedElements);

      const elementsToHighlight = new Set<ExcalidrawElement>();
      selectedFrames.forEach((frame) => {
        const elementsInFrame = getFrameChildren(
          this.scene.getNonDeletedElements(),
          frame.id,
        );

        // keep elements' positions relative to their frames on frames resizing
        if (transformHandleType) {
          if (transformHandleType.includes("w")) {
            elementsInFrame.forEach((element) => {
              mutateElement(element, {
                x:
                  frame.x +
                  (frameElementsOffsetsMap.get(frame.id + element.id)?.x || 0),
                y:
                  frame.y +
                  (frameElementsOffsetsMap.get(frame.id + element.id)?.y || 0),
              });
            });
          }
          if (transformHandleType.includes("n")) {
            elementsInFrame.forEach((element) => {
              mutateElement(element, {
                x:
                  frame.x +
                  (frameElementsOffsetsMap.get(frame.id + element.id)?.x || 0),
                y:
                  frame.y +
                  (frameElementsOffsetsMap.get(frame.id + element.id)?.y || 0),
              });
            });
          }
        }

        getElementsInResizingFrame(
          this.scene.getNonDeletedElements(),
          frame,
          this.state,
        ).forEach((element) => elementsToHighlight.add(element));
      });

      this.setState({
        elementsToHighlight: [...elementsToHighlight],
      });

      return true;
    }
    return false;
  };

  private getContextMenuItems = (
    type: "canvas" | "element",
  ): ContextMenuItems => {
    const options: ContextMenuItems = [];

    options.push(actionCopyAsPng, actionCopyAsSvg);

    // canvas contextMenu
    // -------------------------------------------------------------------------

    if (type === "canvas") {
      if (this.state.viewModeEnabled) {
        return [
          ...options,
          actionToggleGridMode,
          actionToggleZenMode,
          actionToggleViewMode,
          actionToggleStats,
        ];
      }

      return [
        actionPaste,
        CONTEXT_MENU_SEPARATOR,
        actionCopyAsPng,
        actionCopyAsSvg,
        copyText,
        CONTEXT_MENU_SEPARATOR,
        actionSelectAll,
        actionUnlockAllElements,
        CONTEXT_MENU_SEPARATOR,
        actionToggleGridMode,
        actionToggleObjectsSnapMode,
        actionToggleZenMode,
        actionToggleViewMode,
        actionToggleStats,
      ];
    }

    // element contextMenu
    // -------------------------------------------------------------------------

    options.push(copyText);

    if (this.state.viewModeEnabled) {
      return [actionCopy, ...options];
    }

    return [
      actionCut,
      actionCopy,
      actionPaste,
      actionSelectAllElementsInFrame,
      actionRemoveAllElementsFromFrame,
      CONTEXT_MENU_SEPARATOR,
      ...options,
      CONTEXT_MENU_SEPARATOR,
      actionCopyStyles,
      actionPasteStyles,
      CONTEXT_MENU_SEPARATOR,
      actionGroup,
      actionUnbindText,
      actionBindText,
      actionWrapTextInContainer,
      actionUngroup,
      CONTEXT_MENU_SEPARATOR,
      actionAddToLibrary,
      CONTEXT_MENU_SEPARATOR,
      actionSendBackward,
      actionBringForward,
      actionSendToBack,
      actionBringToFront,
      CONTEXT_MENU_SEPARATOR,
      actionFlipHorizontal,
      actionFlipVertical,
      CONTEXT_MENU_SEPARATOR,
      actionToggleLinearEditor,
      actionLink,
      actionDuplicateSelection,
      actionToggleElementLock,
      CONTEXT_MENU_SEPARATOR,
      actionDeleteSelected,
    ];
  };

  private handleWheel = withBatchedUpdates(
    (
      event: WheelEvent | React.WheelEvent<HTMLDivElement | HTMLCanvasElement>,
    ) => {
      event.preventDefault();
      if (isPanning) {
        return;
      }

      const { deltaX, deltaY } = event;
      // note that event.ctrlKey is necessary to handle pinch zooming
      if (event.metaKey || event.ctrlKey) {
        const sign = Math.sign(deltaY);
        const MAX_STEP = ZOOM_STEP * 100;
        const absDelta = Math.abs(deltaY);
        let delta = deltaY;
        if (absDelta > MAX_STEP) {
          delta = MAX_STEP * sign;
        }

        let newZoom = this.state.zoom.value - delta / 100;
        // increase zoom steps the more zoomed-in we are (applies to >100% only)
        newZoom +=
          Math.log10(Math.max(1, this.state.zoom.value)) *
          -sign *
          // reduced amplification for small deltas (small movements on a trackpad)
          Math.min(1, absDelta / 20);

        this.translateCanvas((state) => ({
          ...getStateForZoom(
            {
              viewportX: this.lastViewportPosition.x,
              viewportY: this.lastViewportPosition.y,
              nextZoom: getNormalizedZoom(newZoom),
            },
            state,
          ),
          shouldCacheIgnoreZoom: true,
        }));
        this.resetShouldCacheIgnoreZoomDebounced();
        return;
      }

      // scroll horizontally when shift pressed
      if (event.shiftKey) {
        this.translateCanvas(({ zoom, scrollX }) => ({
          // on Mac, shift+wheel tends to result in deltaX
          scrollX: scrollX - (deltaY || deltaX) / zoom.value,
        }));
        return;
      }

      this.translateCanvas(({ zoom, scrollX, scrollY }) => ({
        scrollX: scrollX - deltaX / zoom.value,
        scrollY: scrollY - deltaY / zoom.value,
      }));
    },
  );

  private getTextWysiwygSnappedToCenterPosition(
    x: number,
    y: number,
    appState: AppState,
    container?: ExcalidrawTextContainer | null,
  ) {
    if (container) {
      let elementCenterX = container.x + container.width / 2;
      let elementCenterY = container.y + container.height / 2;

      const elementCenter = getContainerCenter(container, appState);
      if (elementCenter) {
        elementCenterX = elementCenter.x;
        elementCenterY = elementCenter.y;
      }
      const distanceToCenter = Math.hypot(
        x - elementCenterX,
        y - elementCenterY,
      );
      const isSnappedToCenter =
        distanceToCenter < TEXT_TO_CENTER_SNAP_THRESHOLD;
      if (isSnappedToCenter) {
        const { x: viewportX, y: viewportY } = sceneCoordsToViewportCoords(
          { sceneX: elementCenterX, sceneY: elementCenterY },
          appState,
        );
        return { viewportX, viewportY, elementCenterX, elementCenterY };
      }
    }
  }

  private savePointer = (x: number, y: number, button: "up" | "down") => {
    if (!x || !y) {
      return;
    }
    const { x: sceneX, y: sceneY } = viewportCoordsToSceneCoords(
      { clientX: x, clientY: y },
      this.state,
    );

    if (isNaN(sceneX) || isNaN(sceneY)) {
      // sometimes the pointer goes off screen
    }

    const pointer: CollaboratorPointer = {
      x: sceneX,
      y: sceneY,
      tool: this.state.activeTool.type === "laser" ? "laser" : "pointer",
    };

    this.props.onPointerUpdate?.({
      pointer,
      button,
      pointersMap: gesture.pointers,
    });
  };

  private resetShouldCacheIgnoreZoomDebounced = debounce(() => {
    if (!this.unmounted) {
      this.setState({ shouldCacheIgnoreZoom: false });
    }
  }, 300);

  private updateDOMRect = (cb?: () => void) => {
    if (this.excalidrawContainerRef?.current) {
      const excalidrawContainer = this.excalidrawContainerRef.current;
      const {
        width,
        height,
        left: offsetLeft,
        top: offsetTop,
      } = excalidrawContainer.getBoundingClientRect();
      const {
        width: currentWidth,
        height: currentHeight,
        offsetTop: currentOffsetTop,
        offsetLeft: currentOffsetLeft,
      } = this.state;

      if (
        width === currentWidth &&
        height === currentHeight &&
        offsetLeft === currentOffsetLeft &&
        offsetTop === currentOffsetTop
      ) {
        if (cb) {
          cb();
        }
        return;
      }

      this.setState(
        {
          width,
          height,
          offsetLeft,
          offsetTop,
        },
        () => {
          cb && cb();
        },
      );
    }
  };

  public refresh = () => {
    this.setState({ ...this.getCanvasOffsets() });
  };

  private getCanvasOffsets(): Pick<AppState, "offsetTop" | "offsetLeft"> {
    if (this.excalidrawContainerRef?.current) {
      const excalidrawContainer = this.excalidrawContainerRef.current;
      const { left, top } = excalidrawContainer.getBoundingClientRect();
      return {
        offsetLeft: left,
        offsetTop: top,
      };
    }
    return {
      offsetLeft: 0,
      offsetTop: 0,
    };
  }

  private async updateLanguage() {
    const currentLang =
      languages.find((lang) => lang.code === this.props.langCode) ||
      defaultLang;
    await setLanguage(currentLang);
    this.setAppState({});
  }
}

// -----------------------------------------------------------------------------
// TEST HOOKS
// -----------------------------------------------------------------------------

declare global {
  interface Window {
    h: {
      elements: readonly ExcalidrawElement[];
      state: AppState;
      setState: React.Component<any, AppState>["setState"];
      app: InstanceType<typeof App>;
      history: History;
    };
  }
}

if (import.meta.env.MODE === ENV.TEST || import.meta.env.DEV) {
  window.h = window.h || ({} as Window["h"]);

  Object.defineProperties(window.h, {
    elements: {
      configurable: true,
      get() {
        return this.app?.scene.getElementsIncludingDeleted();
      },
      set(elements: ExcalidrawElement[]) {
        return this.app?.scene.replaceAllElements(elements);
      },
    },
  });
}

export default App;