[Editor] Add the possibility to paste an image from the clipboard (bug 1848317)

src/display/editor/annotation_editor_layer.js

@@ -464,6 +464,31 @@ class AnnotationEditorLayer {
     return null;
   }
 
+  /**
+   * Paste some content into a new editor.
+   * @param {number} mode
+   * @param {Object} params
+   */
+  pasteEditor(mode, params) {
+    this.#uiManager.updateToolbar(mode);
+    this.#uiManager.updateMode(mode);
+
+    const { offsetX, offsetY } = this.#getCenterPoint();
+    const id = this.getNextId();
+    const editor = this.#createNewEditor({
+      parent: this,
+      id,
+      x: offsetX,
+      y: offsetY,
+      uiManager: this.#uiManager,
+      isCentered: true,
+      ...params,
+    });
+    if (editor) {
+      this.add(editor);
+    }
+  }
+
   /**
    * Create a new editor
    * @param {Object} data
@@ -504,10 +529,7 @@ class AnnotationEditorLayer {
     return editor;
   }
 
-  /**
-   * Create and add a new editor.
-   */
-  addNewEditor() {
+  #getCenterPoint() {
     const { x, y, width, height } = this.div.getBoundingClientRect();
     const tlX = Math.max(0, x);
     const tlY = Math.max(0, y);
@@ -520,11 +542,15 @@ class AnnotationEditorLayer {
         ? [centerX, centerY]
         : [centerY, centerX];
 
+    return { offsetX, offsetY };
+  }
+
+  /**
+   * Create and add a new editor.
+   */
+  addNewEditor() {
     this.#createAndAddNewEditor(
-      {
-        offsetX,
-        offsetY,
-      },
+      this.#getCenterPoint(),
       /* isCentered = */ true
     );
   }

src/display/editor/editor.js

@@ -140,6 +140,26 @@ class AnnotationEditor {
     return [];
   }
 
+  /**
+   * Check if this kind of editor is able to handle the given mime type for
+   * pasting.
+   * @param {string} mime
+   * @returns {boolean}
+   */
+  static isHandlingMimeForPasting(_mime) {
+    return false;
+  }
+
+  /**
+   * Extract the data from the clipboard item and delegate the creation of the
+   * editor to the parent.
+   * @param {DataTransferItem} item
+   * @param {AnnotationEditorLayer} parent
+   */
+  static paste(item, parent) {
+    unreachable("Not implemented");
+  }
+
   /**
    * Get the properties to update in the UI for this editor.
    * @returns {Array}

src/display/editor/stamp.js

@@ -30,6 +30,8 @@ class StampEditor extends AnnotationEditor {
 
   #bitmapUrl = null;
 
+  #bitmapFile = null;
+
   #canvas = null;
 
   #observer = null;
@@ -45,6 +47,7 @@ class StampEditor extends AnnotationEditor {
   constructor(params) {
     super({ ...params, name: "stampEditor" });
     this.#bitmapUrl = params.bitmapUrl;
+    this.#bitmapFile = params.bitmapFile;
   }
 
   static get supportedTypes() {
@@ -64,10 +67,26 @@ class StampEditor extends AnnotationEditor {
     return shadow(
       this,
       "supportedTypes",
-      types.map(type => `image/${type}`).join(",")
+      types.map(type => `image/${type}`)
     );
   }
 
+  static get supportedTypesStr() {
+    return shadow(this, "supportedTypesStr", this.supportedTypes.join(","));
+  }
+
+  /** @inheritdoc */
+  static isHandlingMimeForPasting(mime) {
+    return this.supportedTypes.includes(mime);
+  }
+
+  /** @inheritdoc */
+  static paste(item, parent) {
+    parent.pasteEditor(AnnotationEditorType.STAMP, {
+      bitmapFile: item.getAsFile(),
+    });
+  }
+
   #getBitmapDone() {
     this._uiManager.enableWaiting(false);
     if (this.#canvas) {
@@ -115,6 +134,29 @@ class StampEditor extends AnnotationEditor {
       return;
     }
 
+    if (this.#bitmapFile) {
+      const file = this.#bitmapFile;
+      this.#bitmapFile = null;
+      this._uiManager.enableWaiting(true);
+      this.#bitmapPromise = this._uiManager.imageManager
+        .getFromFile(file)
+        .then(data => {
+          this.#bitmapPromise = null;
+          if (!data) {
+            this.remove();
+            return;
+          }
+          ({
+            bitmap: this.#bitmap,
+            id: this.#bitmapId,
+            isSvg: this.#isSvg,
+          } = data);
+          this.#createCanvas();
+        })
+        .finally(() => this.#getBitmapDone());
+      return;
+    }
+
     const input = document.createElement("input");
     if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")) {
       input.hidden = true;
@@ -122,7 +164,7 @@ class StampEditor extends AnnotationEditor {
       document.body.append(input);
     }
     input.type = "file";
-    input.accept = StampEditor.supportedTypes;
+    input.accept = StampEditor.supportedTypesStr;
     this.#bitmapPromise = new Promise(resolve => {
       input.addEventListener("change", async () => {
         this.#bitmapPromise = null;

src/display/editor/tools.js

@@ -919,8 +919,17 @@ class AnnotationEditorUIManager {
    */
   paste(event) {
     event.preventDefault();
+    const { clipboardData } = event;
+    for (const item of clipboardData.items) {
+      for (const editorType of this.#editorTypes) {
+        if (editorType.isHandlingMimeForPasting(item.type)) {
+          editorType.paste(item, this.currentLayer);
+          return;
+        }
+      }
+    }
 
-    let data = event.clipboardData.getData("application/pdfjs");
+    let data = clipboardData.getData("application/pdfjs");
     if (!data) {
       return;
     }
@@ -1099,6 +1108,9 @@ class AnnotationEditorUIManager {
    * @param {string|null} editId
    */
   updateMode(mode, editId = null) {
+    if (this.#mode === mode) {
+      return;
+    }
     this.#mode = mode;
     if (mode === AnnotationEditorType.NONE) {
       this.setEditingState(false);