[Editor] Add a way to highlight text in using the keyboard (bug 1877426)

src/display/editor/annotation_editor_layer.js

@@ -679,15 +679,36 @@ class AnnotationEditorLayer {
 
   /**
    * SelectionChange callback.
-   * @param {Event} _event
+   * @param {Event} event
    */
-  selectionStart(_event) {
-    this.#textLayer?.div.addEventListener(
+  selectionStart(event) {
+    if (
+      !this.#textLayer ||
+      event.target.parentElement.closest(".textLayer") !== this.#textLayer.div
+    ) {
+      return;
+    }
+
+    if (this.#uiManager.isShiftKeyDown) {
+      const keyup = () => {
+        if (this.#uiManager.isShiftKeyDown) {
+          return;
+        }
+
+        window.removeEventListener("keyup", keyup);
+        window.removeEventListener("blur", keyup);
+        this.pointerUpAfterSelection({});
+      };
+      window.addEventListener("keyup", keyup);
+      window.addEventListener("blur", keyup);
+    } else {
+      this.#textLayer.div.addEventListener(
         "pointerup",
         this.#boundPointerUpAfterSelection,
         { once: true }
       );
     }
+  }
 
   /**
    * Called when the user releases the mouse button after having selected

src/display/editor/tools.js

@@ -581,6 +581,8 @@ class AnnotationEditorUIManager {
 
   #boundKeydown = this.keydown.bind(this);
 
+  #boundKeyup = this.keyup.bind(this);
+
   #boundOnEditingAction = this.onEditingAction.bind(this);
 
   #boundOnPageChanging = this.onPageChanging.bind(this);
@@ -765,6 +767,7 @@ class AnnotationEditorUIManager {
       realScale: PixelsPerInch.PDF_TO_CSS_UNITS,
       rotation: 0,
     };
+    this.isShiftKeyDown = false;
   }
 
   destroy() {
@@ -915,6 +918,7 @@ class AnnotationEditorUIManager {
   }
 
   blur() {
+    this.isShiftKeyDown = false;
     if (!this.hasSelection) {
       return;
     }
@@ -952,10 +956,12 @@ class AnnotationEditorUIManager {
     // The keyboard events are caught at the container level in order to be able
     // to execute some callbacks even if the current page doesn't have focus.
     window.addEventListener("keydown", this.#boundKeydown);
+    window.addEventListener("keyup", this.#boundKeyup);
   }
 
   #removeKeyboardManager() {
     window.removeEventListener("keydown", this.#boundKeydown);
+    window.removeEventListener("keyup", this.#boundKeyup);
   }
 
   #addCopyPasteListeners() {
@@ -1084,11 +1090,24 @@ class AnnotationEditorUIManager {
    * @param {KeyboardEvent} event
    */
   keydown(event) {
+    if (!this.isShiftKeyDown && event.key === "Shift") {
+      this.isShiftKeyDown = true;
+    }
     if (!this.isEditorHandlingKeyboard) {
       AnnotationEditorUIManager._keyboardManager.exec(this, event);
     }
   }
 
+  /**
+   * Keyup callback.
+   * @param {KeyboardEvent} event
+   */
+  keyup(event) {
+    if (this.isShiftKeyDown && event.key === "Shift") {
+      this.isShiftKeyDown = false;
+    }
+  }
+
   /**
    * Execute an action for a given name.
    * For example, the user can click on the "Undo" entry in the context menu

test/integration/highlight_editor_spec.mjs

@@ -681,4 +681,64 @@ describe("Highlight Editor", () => {
       );
     });
   });
+
+  describe("Highlight with the keyboard", () => {
+    let pages;
+
+    beforeAll(async () => {
+      pages = await loadAndWait("tracemonkey.pdf", ".annotationEditorLayer");
+    });
+
+    afterAll(async () => {
+      await closePages(pages);
+    });
+
+    it("must check that some text has been highlighted", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await page.click("#editorHighlight");
+          await page.waitForSelector(".annotationEditorLayer.highlightEditing");
+          const sel = getEditorSelector(0);
+
+          const spanRect = await page.evaluate(() => {
+            const span = document.querySelector(
+              `.page[data-page-number="1"] > .textLayer > span`
+            );
+            const { x, y, width, height } = span.getBoundingClientRect();
+            return { x, y, width, height };
+          });
+          await page.keyboard.down("Shift");
+          await page.mouse.click(
+            spanRect.x + 1,
+            spanRect.y + spanRect.height / 2,
+            { count: 2 }
+          );
+          for (let i = 0; i < 6; i++) {
+            await page.keyboard.press("ArrowRight");
+          }
+          await page.keyboard.press("ArrowDown");
+          await page.keyboard.press("ArrowDown");
+          await page.keyboard.up("Shift");
+
+          const [w, h] = await page.evaluate(s => {
+            const {
+              style: { width, height },
+            } = document.querySelector(s);
+            return [parseFloat(width), parseFloat(height)];
+          }, sel);
+
+          // w & h are the width and height of the highlight in percent.
+          // We expect the highlight to be around 73% wide and 9% high.
+          // We allow a 2% margin of error because of the font used in the text
+          // layer we can't be sure of the dimensions.
+          expect(Math.abs(w - 73) <= 2)
+            .withContext(`In ${browserName}`)
+            .toBe(true);
+          expect(Math.abs(h - 9) <= 2)
+            .withContext(`In ${browserName}`)
+            .toBe(true);
+        })
+      );
+    });
+  });
 });