Reintroduce highlighting annotations on hover

app/assets/javascripts/components/annotations/annotation_marker.ts

@@ -1,12 +1,12 @@
 import { customElement, property } from "lit/decorators.js";
 import { html, LitElement, TemplateResult } from "lit";
 import {
-    AnnotationData,
-    annotationState,
+    Annotation,
     compareAnnotationOrders,
     isUserAnnotation
 } from "state/Annotations";
-import { MachineAnnotationData } from "state/MachineAnnotations";
+import { MachineAnnotation } from "state/MachineAnnotations";
+import { StateController } from "state/state_system/StateController";
 /**
  * A marker that styles the slotted content based on the relevant annotations.
  * It applies a background color to user annotations and a wavy underline to machine annotations.
@@ -18,7 +18,9 @@ import { MachineAnnotationData } from "state/MachineAnnotations";
 @customElement("d-annotation-marker")
 export class AnnotationMarker extends LitElement {
     @property({ type: Array })
-    annotations: AnnotationData[];
+    annotations: Annotation[];
+
+    state = new StateController(this);
 
     static colors = {
         "error": "var(--error-color, red)",
@@ -30,30 +32,48 @@ export class AnnotationMarker extends LitElement {
         "question-intense": "var(--question-intense-color, orange)",
     };
 
-    static getStyle(annotation: AnnotationData): string {
+    static getStyle(annotation: Annotation): string {
         if (["error", "warning", "info"].includes(annotation.type)) {
             // shorthand notation does not work in safari
             return `
                 text-decoration-line: underline;
                 text-decoration-color: ${AnnotationMarker.colors[annotation.type]};
-                text-decoration-thickness: 1px;
+                text-decoration-thickness: ${annotation.isHovered ? 2 : 1}px;
                 text-decoration-style: wavy;
                 text-decoration-skip-ink: none;
             `;
         } else {
+            const key = annotation.isHovered ? `${annotation.type}-intense` : annotation.type;
             return `
-                background: ${AnnotationMarker.colors[annotation.type]};
+                background: ${AnnotationMarker.colors[key]};
             `;
         }
     }
 
-    get sortedAnnotations(): AnnotationData[] {
-        return this.annotations.sort( compareAnnotationOrders );
+    /**
+     * Returns the annotations sorted in order of importance.
+     * Hovered annotations are prioritized over non-hovered annotations.
+     * Otherwise the default order is used, defined in `compareAnnotationOrders`.
+     *
+     * Goal is to always show the style of the most important annotation.
+     */
+    get sortedAnnotations(): Annotation[] {
+        return this.annotations.sort( (a, b) => {
+            if (a.isHovered && !b.isHovered) {
+                return -1;
+            }
+
+            if (b.isHovered && !a.isHovered) {
+                return 1;
+            }
+
+            return compareAnnotationOrders(a, b);
+        });
     }
 
     get machineAnnotationMarkerSVG(): TemplateResult | undefined {
-        const firstMachineAnnotation = this.sortedAnnotations.find(a => !isUserAnnotation(a)) as MachineAnnotationData | undefined;
-        const size = 14;
+        const firstMachineAnnotation = this.sortedAnnotations.find(a => !isUserAnnotation(a)) as MachineAnnotation | undefined;
+        const size = firstMachineAnnotation?.isHovered ? 20 : 14;
         return firstMachineAnnotation && html`<svg style="position: absolute; top: ${16 - size/2}px; left: -${size/2}px" width="${size}" height="${size}" viewBox="0 0 24 24">
             <path fill="${AnnotationMarker.colors[firstMachineAnnotation.type]}" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6l-6 6l1.41 1.41Z"/>
         </svg>`;

app/assets/javascripts/components/annotations/annotation_tooltip.ts

@@ -1,7 +1,7 @@
 import { customElement, property } from "lit/decorators.js";
 import { render, html, LitElement, TemplateResult, css } from "lit";
 import tippy, { Instance as Tippy, createSingleton } from "tippy.js";
-import { AnnotationData, annotationState, compareAnnotationOrders, isUserAnnotation } from "state/Annotations";
+import { Annotation, annotationState, compareAnnotationOrders, isUserAnnotation } from "state/Annotations";
 import { StateController } from "state/state_system/StateController";
 import { createDelayer } from "util.js";
 
@@ -16,7 +16,7 @@ const setInstancesDelayer = createDelayer();
 @customElement("d-annotation-tooltip")
 export class AnnotationTooltip extends LitElement {
     @property({ type: Array })
-    annotations: AnnotationData[];
+    annotations: Annotation[];
 
     static styles = css`:host { position: relative; }`;
 
@@ -61,7 +61,7 @@ export class AnnotationTooltip extends LitElement {
     }
 
     // Annotations that are not displayed inline should show up as tooltips.
-    get hiddenAnnotations(): AnnotationData[] {
+    get hiddenAnnotations(): Annotation[] {
         return this.annotations.filter(a => !annotationState.isVisible(a)).sort(compareAnnotationOrders);
     }
 

app/assets/javascripts/components/annotations/annotations_cell.ts

@@ -4,7 +4,7 @@ import { html, TemplateResult } from "lit";
 import { UserAnnotationFormData, userAnnotationState } from "state/UserAnnotations";
 import { annotationState, compareAnnotationOrders } from "state/Annotations";
 import { submissionState } from "state/Submissions";
-import { MachineAnnotationData, machineAnnotationState } from "state/MachineAnnotations";
+import { MachineAnnotation, machineAnnotationState } from "state/MachineAnnotations";
 import "components/annotations/machine_annotation";
 import "components/annotations/user_annotation";
 import "components/annotations/annotation_form";
@@ -33,7 +33,7 @@ export class AnnotationsCell extends ShadowlessLitElement {
 
     annotationFormRef: Ref<AnnotationForm> = createRef();
 
-    get machineAnnotations(): MachineAnnotationData[] {
+    get machineAnnotations(): MachineAnnotation[] {
         return machineAnnotationState.byLine.get(this.row) || [];
     }
 

app/assets/javascripts/components/annotations/hidden_annotations_dot.ts

@@ -1,8 +1,8 @@
 import { ShadowlessLitElement } from "components/meta/shadowless_lit_element";
 import { customElement, property } from "lit/decorators.js";
 import { html, TemplateResult } from "lit";
-import { MachineAnnotationData, machineAnnotationState } from "state/MachineAnnotations";
-import { UserAnnotationData, userAnnotationState } from "state/UserAnnotations";
+import { MachineAnnotation, machineAnnotationState } from "state/MachineAnnotations";
+import { UserAnnotation, userAnnotationState } from "state/UserAnnotations";
 import { i18nMixin } from "components/meta/i18n_mixin";
 import { PropertyValues } from "@lit/reactive-element/development/reactive-element";
 import { initTooltips } from "util.js";
@@ -20,15 +20,15 @@ export class HiddenAnnotationsDot extends i18nMixin(ShadowlessLitElement) {
     @property({ type: Number })
     row: number;
 
-    get machineAnnotations(): MachineAnnotationData[] {
+    get machineAnnotations(): MachineAnnotation[] {
         return machineAnnotationState.byLine.get(this.row) || [];
     }
 
-    get userAnnotations(): UserAnnotationData[] {
+    get userAnnotations(): UserAnnotation[] {
         return userAnnotationState.rootIdsByLine.get(this.row)?.map(id => userAnnotationState.byId.get(id)) || [];
     }
 
-    get hiddenAnnotations(): (MachineAnnotationData | UserAnnotationData)[] {
+    get hiddenAnnotations(): (MachineAnnotation | UserAnnotation)[] {
         return [...this.machineAnnotations, ...this.userAnnotations].filter(a => !annotationState.isVisible(a));
     }
 

app/assets/javascripts/components/annotations/line_of_code.ts

@@ -1,9 +1,9 @@
 import { ShadowlessLitElement } from "components/meta/shadowless_lit_element";
 import { customElement, property } from "lit/decorators.js";
 import { html, TemplateResult } from "lit";
-import { MachineAnnotationData, machineAnnotationState } from "state/MachineAnnotations";
-import { UserAnnotationData, userAnnotationState } from "state/UserAnnotations";
-import { AnnotationData, compareAnnotationOrders } from "state/Annotations";
+import { MachineAnnotation, machineAnnotationState } from "state/MachineAnnotations";
+import { UserAnnotation, userAnnotationState } from "state/UserAnnotations";
+import { Annotation, compareAnnotationOrders } from "state/Annotations";
 import { submissionState } from "state/Submissions";
 import "components/annotations/annotation_marker";
 import "components/annotations/annotation_tooltip";
@@ -13,7 +13,7 @@ import { unsafeHTML } from "lit/directives/unsafe-html.js";
 declare type range = {
     start: number;
     length: number;
-    annotations: AnnotationData[];
+    annotations: Annotation[];
 };
 
 function numberArrayEquals(a: number[], b: number[]): boolean {
@@ -47,15 +47,15 @@ export class LineOfCode extends ShadowlessLitElement {
         return this.code.length;
     }
 
-    get machineAnnotationsToMark(): MachineAnnotationData[] {
+    get machineAnnotationsToMark(): MachineAnnotation[] {
         return machineAnnotationState.byMarkedLine.get(this.row) || [];
     }
 
-    get userAnnotationsToMark(): UserAnnotationData[] {
+    get userAnnotationsToMark(): UserAnnotation[] {
         return userAnnotationState.rootIdsByMarkedLine.get(this.row)?.map(i => userAnnotationState.byId.get(i)) || [];
     }
 
-    get fullLineAnnotations(): UserAnnotationData[] {
+    get fullLineAnnotations(): UserAnnotation[] {
         return this.userAnnotationsToMark
             .filter(a => !a.column && !a.columns)
             .sort(compareAnnotationOrders);
@@ -67,7 +67,7 @@ export class LineOfCode extends ShadowlessLitElement {
      * In that case, the range will be the part of the line that is covered by the annotation.
      * @param annotation The annotation to calculate the range for.
      */
-    getRangeFromAnnotation(annotation: AnnotationData, index: number): { start: number, length: number, index: number } {
+    getRangeFromAnnotation(annotation: Annotation, index: number): { start: number, length: number, index: number } {
         const isMachineAnnotation = ["error", "warning", "info"].includes(annotation.type);
         const rowsLength = annotation.rows ?? 1;
         let lastRow = annotation.row ? annotation.row + rowsLength : 0;
@@ -131,7 +131,7 @@ export class LineOfCode extends ShadowlessLitElement {
     }
 
     get ranges(): range[] {
-        const toMark: AnnotationData[] = [...this.machineAnnotationsToMark, ...this.userAnnotationsToMark];
+        const toMark: Annotation[] = [...this.machineAnnotationsToMark, ...this.userAnnotationsToMark];
         // We use indexes to simplify the equality check in mergeRanges
         const ranges = toMark.map((annotation, index) => this.getRangeFromAnnotation(annotation, index));
         const mergedRanges = this.mergeRanges(ranges);

app/assets/javascripts/components/annotations/machine_annotation.ts

@@ -1,21 +1,20 @@
 import { html, TemplateResult } from "lit";
 import { customElement, property } from "lit/decorators.js";
 import { ShadowlessLitElement } from "components/meta/shadowless_lit_element";
-import { MachineAnnotationData } from "state/MachineAnnotations";
-import { annotationState } from "state/Annotations";
+import { MachineAnnotation } from "state/MachineAnnotations";
 
 
 /**
  * This component represents a machine annotation.
  *
  * @element d-machine-annotation
  *
- * @prop {MachineAnnotationData} data - The machine annotation data.
+ * @prop {MachineAnnotation} data - The machine annotation data.
  */
 @customElement("d-machine-annotation")
-export class MachineAnnotation extends ShadowlessLitElement {
+export class MachineAnnotationComponent extends ShadowlessLitElement {
     @property({ type: Object })
-    data: MachineAnnotationData;
+    data: MachineAnnotation;
 
     protected get hasNotice(): boolean {
         return this.data.externalUrl !== null && this.data.externalUrl !== undefined;
@@ -30,7 +29,9 @@ export class MachineAnnotation extends ShadowlessLitElement {
 
     render(): TemplateResult {
         return html`
-            <div class="annotation machine-annotation ${this.data.type}">
+            <div class="annotation machine-annotation ${this.data.type}"
+                 @mouseenter="${() => this.data.isHovered = true}"
+                 @mouseleave="${() => this.data.isHovered = false}">
                 <div class="annotation-header">
                     <span class="annotation-meta">
                         ${I18n.t(`js.annotation.type.${this.data.type}`)}

app/assets/javascripts/components/annotations/thread.ts

@@ -1,8 +1,7 @@
 import { ShadowlessLitElement } from "components/meta/shadowless_lit_element";
 import { customElement, property } from "lit/decorators.js";
 import {
-
-    UserAnnotationData,
+    UserAnnotation,
     UserAnnotationFormData, userAnnotationState
 } from "state/UserAnnotations";
 import { html, TemplateResult } from "lit";
@@ -31,11 +30,11 @@ export class Thread extends i18nMixin(ShadowlessLitElement) {
 
     annotationFormRef: Ref<AnnotationForm> = createRef();
 
-    get data(): UserAnnotationData {
+    get data(): UserAnnotation {
         return userAnnotationState.byId.get(this.rootId);
     }
 
-    get openQuestions(): UserAnnotationData[] | undefined {
+    get openQuestions(): UserAnnotation[] | undefined {
         return [this.data, ...this.data.responses]
             .filter(response => response.question_state !== undefined && response.question_state !== "answered");
     }
@@ -87,7 +86,9 @@ export class Thread extends i18nMixin(ShadowlessLitElement) {
 
     render(): TemplateResult {
         return this.data ? html`
-            <div class="thread ${annotationState.isVisible(this.data) ? "" : "hidden"}">
+            <div class="thread ${annotationState.isVisible(this.data) ? "" : "hidden"}"
+                 @mouseenter="${() => this.data.isHovered = true}"
+                 @mouseleave="${() => this.data.isHovered = false}">
                 <d-user-annotation .data=${this.data}></d-user-annotation>
                 ${this.data.responses.map(response => html`
                     <d-user-annotation .data=${response}></d-user-annotation>

app/assets/javascripts/components/annotations/user_annotation.ts

@@ -2,7 +2,7 @@ import { html, PropertyValues, TemplateResult } from "lit";
 import { customElement, property } from "lit/decorators.js";
 import { unsafeHTML } from "lit/directives/unsafe-html.js";
 import { ShadowlessLitElement } from "components/meta/shadowless_lit_element";
-import { UserAnnotationData, userAnnotationState } from "state/UserAnnotations";
+import { UserAnnotation, userAnnotationState } from "state/UserAnnotations";
 import { i18nMixin } from "components/meta/i18n_mixin";
 import { AnnotationForm } from "components/annotations/annotation_form";
 import { createRef, Ref, ref } from "lit/directives/ref.js";
@@ -18,12 +18,12 @@ import { annotationState } from "state/Annotations";
  *
  * @element d-user-annotation
  *
- * @prop {UserAnnotationData} data - the data of the annotation
+ * @prop {UserAnnotation} data - the annotation
  */
 @customElement("d-user-annotation")
-export class UserAnnotation extends i18nMixin(ShadowlessLitElement) {
+export class UserAnnotationComponent extends i18nMixin(ShadowlessLitElement) {
     @property({ type: Object })
-    data: UserAnnotationData;
+    data: UserAnnotation;
 
     @property({ state: true })
     editing = false;
@@ -175,7 +175,9 @@ export class UserAnnotation extends i18nMixin(ShadowlessLitElement) {
 
     render(): TemplateResult {
         return html`
-            <div class="annotation ${this.data.type == "annotation" ? "user" : "question"}">
+            <div class="annotation ${this.data.type === "annotation" ? "user" : "question"}"
+                 @mouseenter="${() => this.data.isHovered = true}"
+                 @mouseleave="${() => this.data.isHovered = false}">
                 <div class="annotation-header">
                     <span class="annotation-meta">
                         ${this.header}

app/assets/javascripts/state/Annotations.ts

@@ -1,10 +1,10 @@
-import { MachineAnnotationData } from "state/MachineAnnotations";
-import { AnnotationType, UserAnnotationData } from "state/UserAnnotations";
+import { MachineAnnotation } from "state/MachineAnnotations";
+import { AnnotationType, UserAnnotation } from "state/UserAnnotations";
 import { State } from "state/state_system/State";
 import { stateProperty } from "state/state_system/StateProperty";
 
 export type AnnotationVisibilityOptions = "all" | "important" | "none";
-export type AnnotationData = MachineAnnotationData | UserAnnotationData;
+export type Annotation = MachineAnnotation | UserAnnotation;
 
 const annotationOrder: Record<AnnotationType, number> = {
     annotation: 0,
@@ -14,19 +14,19 @@ const annotationOrder: Record<AnnotationType, number> = {
     info: 4,
 };
 
-export function compareAnnotationOrders(a: AnnotationData, b: AnnotationData): number {
+export function compareAnnotationOrders(a: Annotation, b: Annotation): number {
     return annotationOrder[a.type] - annotationOrder[b.type];
 }
 
-export function isUserAnnotation(annotation: AnnotationData): annotation is UserAnnotationData {
+export function isUserAnnotation(annotation: Annotation): annotation is UserAnnotation {
     return annotation.type === "annotation" || annotation.type === "question";
 }
 
 class AnnotationState extends State {
     @stateProperty visibility: AnnotationVisibilityOptions = "all";
     @stateProperty isQuestionMode = false;
 
-    isVisible(annotation: AnnotationData): boolean {
+    isVisible(annotation: Annotation): boolean {
         if (this.visibility === "none") {
             return false;
         }

app/assets/javascripts/state/MachineAnnotations.ts

@@ -2,6 +2,7 @@ import { AnnotationType } from "state/UserAnnotations";
 import { State } from "state/state_system/State";
 import { stateProperty } from "state/state_system/StateProperty";
 import { StateMap } from "state/state_system/StateMap";
+import { createStateFromInterface } from "state/state_system/CreateStateFromInterface";
 
 export interface MachineAnnotationData {
     type: AnnotationType;
@@ -13,16 +14,21 @@ export interface MachineAnnotationData {
     columns?: number;
 }
 
+export class MachineAnnotation extends createStateFromInterface<MachineAnnotationData>() {
+    @stateProperty public isHovered = false;
+}
+
 class MachineAnnotationState extends State {
-    @stateProperty public byLine = new StateMap<number, MachineAnnotationData[]>();
-    @stateProperty public byMarkedLine = new StateMap<number, MachineAnnotationData[]>();
+    @stateProperty public byLine = new StateMap<number, MachineAnnotation[]>();
+    @stateProperty public byMarkedLine = new StateMap<number, MachineAnnotation[]>();
     @stateProperty public count = 0;
 
     public setMachineAnnotations(annotations: MachineAnnotationData[]): void {
         this.count = annotations.length;
         this.byLine.clear();
         this.byMarkedLine.clear();
-        for (const annotation of annotations) {
+        for (const data of annotations) {
+            const annotation = new MachineAnnotation(data);
             const markedLength = annotation.rows ?? 1;
             const line = annotation.row ? annotation.row + markedLength : 1;
             if (this.byLine.has(line)) {