feat(modal): clicking handle advances to the next breakpoint

angular/src/directives/overlays/modal.ts

@@ -63,6 +63,7 @@ export declare interface IonModal extends Components.IonModal {
     'enterAnimation',
     'event',
     'handle',
+    'handleBehavior',
     'initialBreakpoint',
     'isOpen',
     'keyboardClose',
@@ -93,6 +94,7 @@ export declare interface IonModal extends Components.IonModal {
     'enterAnimation',
     'event',
     'handle',
+    'handleBehavior',
     'initialBreakpoint',
     'isOpen',
     'keyboardClose',

core/api.txt

@@ -773,6 +773,7 @@ ion-modal,prop,breakpoints,number[] | undefined,undefined,false,false
 ion-modal,prop,canDismiss,(() => Promise<boolean>) | boolean | undefined,undefined,false,false
 ion-modal,prop,enterAnimation,((baseEl: any, opts?: any) => Animation) | undefined,undefined,false,false
 ion-modal,prop,handle,boolean | undefined,undefined,false,false
+ion-modal,prop,handleBehavior,"cycle" | "none" | undefined,'none',false,false
 ion-modal,prop,htmlAttributes,undefined | { [key: string]: any; },undefined,false,false
 ion-modal,prop,initialBreakpoint,number | undefined,undefined,false,false
 ion-modal,prop,isOpen,boolean,false,false,false

core/src/components.d.ts

@@ -5,7 +5,7 @@
  * It contains typing information for all components that exist in this project.
  */
 import { HTMLStencilElement, JSXBase } from "@stencil/core/internal";
-import { AccordionGroupChangeEventDetail, ActionSheetAttributes, ActionSheetButton, AlertButton, AlertInput, AnimationBuilder, AutocompleteTypes, BreadcrumbCollapsedClickEventDetail, CheckboxChangeEventDetail, Color, ComponentProps, ComponentRef, DatetimeChangeEventDetail, DomRenderFn, FooterHeightFn, FrameworkDelegate, HeaderFn, HeaderHeightFn, InputChangeEventDetail, ItemHeightFn, ItemRenderFn, ItemReorderEventDetail, LoadingAttributes, MenuChangeEventDetail, ModalAttributes, ModalBreakpointChangeEventDetail, NavComponent, NavComponentWithProps, NavOptions, OverlayEventDetail, PickerAttributes, PickerButton, PickerColumn, PopoverAttributes, PopoverSize, PositionAlign, PositionReference, PositionSide, RadioGroupChangeEventDetail, RangeChangeEventDetail, RangeKnobMoveEndEventDetail, RangeKnobMoveStartEventDetail, RangeValue, RefresherEventDetail, RouteID, RouterDirection, RouterEventDetail, RouterOutletOptions, RouteWrite, ScrollBaseDetail, ScrollDetail, SearchbarChangeEventDetail, SegmentButtonLayout, SegmentChangeEventDetail, SelectChangeEventDetail, SelectInterface, SelectPopoverOption, Side, SpinnerTypes, StyleEventDetail, SwipeGestureHandler, TabBarChangedEventDetail, TabButtonClickEventDetail, TabButtonLayout, TextareaChangeEventDetail, TextFieldTypes, ToastButton, ToggleChangeEventDetail, TransitionDoneFn, TransitionInstruction, TriggerAction, ViewController } from "./interface";
+import { AccordionGroupChangeEventDetail, ActionSheetAttributes, ActionSheetButton, AlertButton, AlertInput, AnimationBuilder, AutocompleteTypes, BreadcrumbCollapsedClickEventDetail, CheckboxChangeEventDetail, Color, ComponentProps, ComponentRef, DatetimeChangeEventDetail, DomRenderFn, FooterHeightFn, FrameworkDelegate, HeaderFn, HeaderHeightFn, InputChangeEventDetail, ItemHeightFn, ItemRenderFn, ItemReorderEventDetail, LoadingAttributes, MenuChangeEventDetail, ModalAttributes, ModalBreakpointChangeEventDetail, ModalHandleBehavior, NavComponent, NavComponentWithProps, NavOptions, OverlayEventDetail, PickerAttributes, PickerButton, PickerColumn, PopoverAttributes, PopoverSize, PositionAlign, PositionReference, PositionSide, RadioGroupChangeEventDetail, RangeChangeEventDetail, RangeKnobMoveEndEventDetail, RangeKnobMoveStartEventDetail, RangeValue, RefresherEventDetail, RouteID, RouterDirection, RouterEventDetail, RouterOutletOptions, RouteWrite, ScrollBaseDetail, ScrollDetail, SearchbarChangeEventDetail, SegmentButtonLayout, SegmentChangeEventDetail, SelectChangeEventDetail, SelectInterface, SelectPopoverOption, Side, SpinnerTypes, StyleEventDetail, SwipeGestureHandler, TabBarChangedEventDetail, TabButtonClickEventDetail, TabButtonLayout, TextareaChangeEventDetail, TextFieldTypes, ToastButton, ToggleChangeEventDetail, TransitionDoneFn, TransitionInstruction, TriggerAction, ViewController } from "./interface";
 import { IonicSafeString } from "./utils/sanitization";
 import { AlertAttributes } from "./components/alert/alert-interface";
 import { CounterFormatter } from "./components/item/item-interface";
@@ -1558,6 +1558,10 @@ export namespace Components {
           * The horizontal line that displays at the top of a sheet modal. It is `true` by default when setting the `breakpoints` and `initialBreakpoint` properties.
          */
         "handle"?: boolean;
+        /**
+          * The interaction behavior for the sheet modal when the handle is pressed.  Defaults to `"none"`, which  means the modal will not change size or position when the handle is pressed. Set to `"cycle"` to let the modal cycle between available breakpoints when pressed.  Handle behavior is unavailable when the `handle` property is set to `false` or when the `breakpoints` property is not set (using a fullscreen or card modal).
+         */
+        "handleBehavior"?: ModalHandleBehavior;
         "hasController": boolean;
         /**
           * Additional attributes to pass to the modal.
@@ -5483,6 +5487,10 @@ declare namespace LocalJSX {
           * The horizontal line that displays at the top of a sheet modal. It is `true` by default when setting the `breakpoints` and `initialBreakpoint` properties.
          */
         "handle"?: boolean;
+        /**
+          * The interaction behavior for the sheet modal when the handle is pressed.  Defaults to `"none"`, which  means the modal will not change size or position when the handle is pressed. Set to `"cycle"` to let the modal cycle between available breakpoints when pressed.  Handle behavior is unavailable when the `handle` property is set to `false` or when the `breakpoints` property is not set (using a fullscreen or card modal).
+         */
+        "handleBehavior"?: ModalHandleBehavior;
         "hasController"?: boolean;
         /**
           * Additional attributes to pass to the modal.

core/src/components/modal/gestures/sheet.ts

@@ -294,66 +294,72 @@ export const createSheetGesture = (
      */
     gesture.enable(false);
 
-    animation
-      .onFinish(
-        () => {
-          if (shouldRemainOpen) {
-            /**
-             * Once the snapping animation completes,
-             * we need to reset the animation to go
-             * from 0 to 1 so users can swipe in any direction.
-             * We then set the animation offset to the current
-             * breakpoint so that it starts at the snapped position.
-             */
-            if (wrapperAnimation && backdropAnimation) {
-              raf(() => {
-                wrapperAnimation.keyframes([...SheetDefaults.WRAPPER_KEYFRAMES]);
-                backdropAnimation.keyframes([...SheetDefaults.BACKDROP_KEYFRAMES]);
-                animation.progressStart(true, 1 - snapToBreakpoint);
-                currentBreakpoint = snapToBreakpoint;
-                onBreakpointChange(currentBreakpoint);
-
-                /**
-                 * If the sheet is fully expanded, we can safely
-                 * enable scrolling again.
-                 */
-                if (contentEl && currentBreakpoint === breakpoints[breakpoints.length - 1]) {
-                  contentEl.scrollY = true;
-                }
-
-                /**
-                 * Backdrop should become enabled
-                 * after the backdropBreakpoint value
-                 */
-                const shouldEnableBackdrop = currentBreakpoint > backdropBreakpoint;
-                if (shouldEnableBackdrop) {
-                  enableBackdrop();
-                } else {
-                  disableBackdrop();
-                }
-
-                gesture.enable(true);
-              });
-            } else {
-              gesture.enable(true);
-            }
-          }
-
-          /**
-           * This must be a one time callback
-           * otherwise a new callback will
-           * be added every time onEnd runs.
-           */
-        },
-        { oneTimeCallback: true }
-      )
-      .progressEnd(1, 0, 500);
-
     if (shouldPreventDismiss) {
       handleCanDismiss(baseEl, animation);
     } else if (!shouldRemainOpen) {
       onDismiss();
     }
+
+    return new Promise<void>((resolve) => {
+      animation
+        .onFinish(
+          () => {
+            if (shouldRemainOpen) {
+              /**
+               * Once the snapping animation completes,
+               * we need to reset the animation to go
+               * from 0 to 1 so users can swipe in any direction.
+               * We then set the animation offset to the current
+               * breakpoint so that it starts at the snapped position.
+               */
+              if (wrapperAnimation && backdropAnimation) {
+                raf(() => {
+                  wrapperAnimation.keyframes([...SheetDefaults.WRAPPER_KEYFRAMES]);
+                  backdropAnimation.keyframes([...SheetDefaults.BACKDROP_KEYFRAMES]);
+                  animation.progressStart(true, 1 - snapToBreakpoint);
+                  currentBreakpoint = snapToBreakpoint;
+                  onBreakpointChange(currentBreakpoint);
+
+                  /**
+                   * If the sheet is fully expanded, we can safely
+                   * enable scrolling again.
+                   */
+                  if (contentEl && currentBreakpoint === breakpoints[breakpoints.length - 1]) {
+                    contentEl.scrollY = true;
+                  }
+
+                  /**
+                   * Backdrop should become enabled
+                   * after the backdropBreakpoint value
+                   */
+                  const shouldEnableBackdrop = currentBreakpoint > backdropBreakpoint;
+                  if (shouldEnableBackdrop) {
+                    enableBackdrop();
+                  } else {
+                    disableBackdrop();
+                  }
+
+                  gesture.enable(true);
+                  resolve();
+                });
+              } else {
+                gesture.enable(true);
+                resolve();
+              }
+            } else {
+              resolve();
+            }
+
+            /**
+             * This must be a one time callback
+             * otherwise a new callback will
+             * be added every time onEnd runs.
+             */
+          },
+          { oneTimeCallback: true }
+        )
+        .progressEnd(1, 0, 500);
+    });
   };
 
   const gesture = createGesture({

core/src/components/modal/modal-interface.ts

@@ -48,3 +48,8 @@ export interface ModalCustomEvent extends CustomEvent {
  * @deprecated - Use { [key: string]: any } directly instead.
  */
 export type ModalAttributes = { [key: string]: any };
+
+/**
+ * The behavior setting for modals when the handle is pressed.
+ */
+export type ModalHandleBehavior = 'none' | 'cycle';

core/src/components/modal/modal.scss

@@ -50,7 +50,8 @@
   contain: strict;
 }
 
-.modal-wrapper, ion-backdrop {
+.modal-wrapper,
+ion-backdrop {
   pointer-events: auto;
 }
 
@@ -124,9 +125,30 @@
    */
   transform: translateZ(0);
 
+  border: 0;
+
   background: var(--ion-color-step-350, #c0c0be);
 
+  cursor: pointer;
+
   z-index: 11;
+
+  &::before {
+    /**
+     * Adds a 4px tap area to the perimeter
+     * of the handle.
+     */
+    @include padding(4px, 4px, 4px, 4px);
+
+    position: absolute;
+
+    width: 36px;
+    height: 5px;
+
+    transform: translate(-50%, -50%);
+
+    content: "";
+  }
 }
 
 /**

core/src/components/modal/modal.tsx

@@ -12,6 +12,7 @@ import type {
   Gesture,
   ModalAttributes,
   ModalBreakpointChangeEventDetail,
+  ModalHandleBehavior,
   OverlayEventDetail,
   OverlayInterface,
 } from '../../interface';
@@ -56,14 +57,15 @@ export class Modal implements ComponentInterface, OverlayInterface {
   private modalId?: string;
   private coreDelegate: FrameworkDelegate = CoreDelegate();
   private currentTransition?: Promise<any>;
+  private sheetTransition?: Promise<any>;
   private destroyTriggerInteraction?: () => void;
   private isSheetModal = false;
   private currentBreakpoint?: number;
   private wrapperEl?: HTMLElement;
   private backdropEl?: HTMLIonBackdropElement;
   private sortedBreakpoints?: number[];
   private keyboardOpenCallback?: () => void;
-  private moveSheetToBreakpoint?: (options: MoveSheetToBreakpointOptions) => void;
+  private moveSheetToBreakpoint?: (options: MoveSheetToBreakpointOptions) => Promise<void>;
 
   private inline = false;
   private workingDelegate?: FrameworkDelegate;
@@ -140,6 +142,17 @@ export class Modal implements ComponentInterface, OverlayInterface {
    */
   @Prop() handle?: boolean;
 
+  /**
+   * The interaction behavior for the sheet modal when the handle is pressed.
+   *
+   * Defaults to `"none"`, which  means the modal will not change size or position when the handle is pressed.
+   * Set to `"cycle"` to let the modal cycle between available breakpoints when pressed.
+   *
+   * Handle behavior is unavailable when the `handle` property is set to `false` or
+   * when the `breakpoints` property is not set (using a fullscreen or card modal).
+   */
+  @Prop() handleBehavior?: ModalHandleBehavior = 'none';
+
   /**
    * The component to display inside of the modal.
    * @internal
@@ -758,11 +771,13 @@ export class Modal implements ComponentInterface, OverlayInterface {
     }
 
     if (moveSheetToBreakpoint) {
-      moveSheetToBreakpoint({
+      this.sheetTransition = moveSheetToBreakpoint({
         breakpoint,
         breakpointOffset: 1 - currentBreakpoint!,
         canDismiss: canDismiss !== undefined && canDismiss !== true && breakpoints![0] === 0,
       });
+      await this.sheetTransition;
+      this.sheetTransition = undefined;
     }
   }
 
@@ -774,7 +789,55 @@ export class Modal implements ComponentInterface, OverlayInterface {
     return this.currentBreakpoint;
   }
 
+  private async moveToNextBreakpoint() {
+    const { breakpoints, currentBreakpoint } = this;
+
+    if (!breakpoints || currentBreakpoint == null) {
+      /**
+       * If the modal does not have breakpoints and/or the current
+       * breakpoint is not set, we can't move to the next breakpoint.
+       */
+      return false;
+    }
+
+    const allowedBreakpoints = breakpoints.filter((b) => b !== 0);
+    const currentBreakpointIndex = allowedBreakpoints.indexOf(currentBreakpoint);
+    const nextBreakpointIndex = (currentBreakpointIndex + 1) % allowedBreakpoints.length;
+    const nextBreakpoint = allowedBreakpoints[nextBreakpointIndex];
+
+    /**
+     * Sets the current breakpoint to the next available breakpoint.
+     * If the current breakpoint is the last breakpoint, we set the current
+     * breakpoint to the first non-zero breakpoint to avoid dismissing the sheet.
+     */
+    await this.setCurrentBreakpoint(nextBreakpoint);
+    return true;
+  }
+
+  private onHandleClick = () => {
+    const { sheetTransition, handleBehavior } = this;
+    if (handleBehavior !== 'cycle' || sheetTransition !== undefined) {
+      /**
+       * The sheet modal should not advance to the next breakpoint
+       * if the handle behavior is not `cycle` or if the handle
+       * is clicked while the sheet is moving to a breakpoint.
+       */
+      return;
+    }
+    this.moveToNextBreakpoint();
+  };
+
   private onBackdropTap = () => {
+    const { sheetTransition } = this;
+    if (sheetTransition !== undefined) {
+      /**
+       * When the handle is double clicked at the largest breakpoint,
+       * it will start to move to the first breakpoint. While transitioning,
+       * the backdrop will often receive the second click. We prevent the
+       * backdrop from dismissing the modal while moving between breakpoints.
+       */
+      return;
+    }
     this.dismiss(undefined, BACKDROP);
   };
 
@@ -792,12 +855,13 @@ export class Modal implements ComponentInterface, OverlayInterface {
   };
 
   render() {
-    const { handle, isSheetModal, presentingElement, htmlAttributes } = this;
+    const { handle, isSheetModal, presentingElement, htmlAttributes, handleBehavior } = this;
 
     const showHandle = handle !== false && isSheetModal;
     const mode = getIonMode(this);
     const { modalId } = this;
     const isCardModal = presentingElement !== undefined && mode === 'ios';
+    const isHandleCycle = handleBehavior === 'cycle';
 
     return (
       <Host
@@ -833,7 +897,16 @@ export class Modal implements ComponentInterface, OverlayInterface {
         {mode === 'ios' && <div class="modal-shadow"></div>}
 
         <div role="dialog" class="modal-wrapper ion-overlay-wrapper" part="content" ref={(el) => (this.wrapperEl = el)}>
-          {showHandle && <div class="modal-handle" part="handle"></div>}
+          {showHandle && (
+            <button
+              class="modal-handle"
+              // Prevents the handle from receiving keyboard focus when it does not cycle
+              tabIndex={!isHandleCycle ? -1 : 0}
+              aria-label="Activate to adjust the size of the dialog overlaying the screen"
+              onClick={isHandleCycle ? this.onHandleClick : undefined}
+              part="handle"
+            ></button>
+          )}
           <slot></slot>
         </div>
       </Host>

core/src/components/modal/test/sheet/index.html

@@ -115,6 +115,14 @@
           <ion-button id="custom-height-modal" onclick="presentModal({ cssClass: 'custom-height' })"
             >Present Sheet Modal (Custom Height)</ion-button
           >
+
+          <ion-button
+            id="handle-behavior-cycle-modal"
+            onclick="presentModal({ handleBehavior: 'cycle', initialBreakpoint: 0.25, breakpoints: [0, 0.25, 0.5, 0.75, 1] })"
+          >
+            Present Sheet Modal (HandleBehavior: Cycle)</ion-button
+          >
+
           <ion-button id="custom-handle-modal" onclick="presentModal({ cssClass: 'custom-handle' })"
             >Present Sheet Modal (Custom Handle)</ion-button
           >