[Editor] Dispatch an event when some global states are changing

- this way the context menu in Firefox can take into account what we
  have in the clipboard, if an editor is selected, ...
- when the user will click on a context menu item, an action will be
  triggered, hence this patch adds what is required to handle it;
- some tests will be added in the Firefox' patch.

web/app.js

@@ -186,6 +186,10 @@ class DefaultExternalServices {
   static get isInAutomation() {
     return shadow(this, "isInAutomation", false);
   }
+
+  static updateEditorStates(data) {
+    throw new Error("Not implemented: updateEditorStates");
+  }
 }
 
 const PDFViewerApplication = {
@@ -1954,6 +1958,12 @@ const PDFViewerApplication = {
       eventBus._on("fileinputchange", webViewerFileInputChange);
       eventBus._on("openfile", webViewerOpenFile);
     }
+    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
+      eventBus._on(
+        "annotationeditorstateschanged",
+        webViewerAnnotationEditorStatesChanged
+      );
+    }
   },
 
   bindWindowEvents() {
@@ -3076,6 +3086,10 @@ function beforeUnload(evt) {
   return false;
 }
 
+function webViewerAnnotationEditorStatesChanged(data) {
+  PDFViewerApplication.externalServices.updateEditorStates(data);
+}
+
 /* Abstract factory for the print service. */
 const PDFPrintServiceFactory = {
   instance: {

web/base_viewer.js

@@ -640,6 +640,10 @@ class BaseViewer {
       if (this._scriptingManager) {
         this._scriptingManager.setDocument(null);
       }
+      if (this.#annotationEditorUIManager) {
+        this.#annotationEditorUIManager.destroy();
+        this.#annotationEditorUIManager = null;
+      }
     }
 
     this.pdfDocument = pdfDocument;
@@ -899,7 +903,6 @@ class BaseViewer {
   }
 
   _resetView() {
-    this.#annotationEditorUIManager = null;
     this._pages = [];
     this._currentPageNumber = 1;
     this._currentScale = UNKNOWN_SCALE;

web/firefoxcom.js

@@ -271,6 +271,20 @@ class MozL10n {
   window.addEventListener("save", handleEvent);
 })();
 
+(function listenEditingEvent() {
+  const handleEvent = function ({ detail }) {
+    if (!PDFViewerApplication.initialized) {
+      return;
+    }
+    PDFViewerApplication.eventBus.dispatch("editingaction", {
+      source: window,
+      name: detail.name,
+    });
+  };
+
+  window.addEventListener("editingaction", handleEvent);
+})();
+
 class FirefoxComDataRangeTransport extends PDFDataRangeTransport {
   requestDataRange(begin, end) {
     FirefoxCom.request("requestDataRange", { begin, end });
@@ -384,6 +398,10 @@ class FirefoxExternalServices extends DefaultExternalServices {
     return new FirefoxPreferences();
   }
 
+  static updateEditorStates(data) {
+    FirefoxCom.request("updateEditorStates", data);
+  }
+
   static createL10n(options) {
     const mozL10n = document.mozL10n;
     // TODO refactor mozL10n.setExternalLocalizerServices