[Editor] Add a new dialog for alt-text settings (bug 1909604)

This patch adds a new entry in the secondary menu in order to open a dialog to let the user:
 - disables the alt-text generation thanks to a ML model;
 - deletes the alt-text model downloaded in Firefox;
 - disabled the new alt-text flow.

web/app.js

@@ -59,12 +59,15 @@ import {
 import { AppOptions, OptionKind } from "./app_options.js";
 import { EventBus, FirefoxEventBus } from "./event_utils.js";
 import { ExternalServices, initCom, MLManager } from "web-external_services";
+import {
+  ImageAltTextSettings,
+  NewAltTextManager,
+} from "web-new_alt_text_manager";
 import { LinkTarget, PDFLinkService } from "./pdf_link_service.js";
 import { AltTextManager } from "web-alt_text_manager";
 import { AnnotationEditorParams } from "web-annotation_editor_params";
 import { CaretBrowsingMode } from "./caret_browsing.js";
 import { DownloadManager } from "web-download_manager";
-import { NewAltTextManager } from "web-new_alt_text_manager";
 import { OverlayManager } from "./overlay_manager.js";
 import { PasswordPrompt } from "./password_prompt.js";
 import { PDFAttachmentViewer } from "web-pdf_attachment_viewer";
@@ -151,6 +154,8 @@ const PDFViewerApplication = {
   l10n: null,
   /** @type {AnnotationEditorParams} */
   annotationEditorParams: null,
+  /** @type {ImageAltTextSettings} */
+  imageAltTextSettings: null,
   isInitialViewSet: false,
   isViewerEmbedded: window.parent !== window,
   url: "",
@@ -211,6 +216,9 @@ const PDFViewerApplication = {
           this.mlManager =
             MLManager.getFakeMLManager?.({
               enableGuessAltText: AppOptions.get("enableGuessAltText"),
+              enableAltTextModelDownload: AppOptions.get(
+                "enableAltTextModelDownload"
+              ),
             }) || null;
         }
       }
@@ -218,6 +226,9 @@ const PDFViewerApplication = {
       // We want to load the image-to-text AI engine as soon as possible.
       this.mlManager = new MLManager({
         enableGuessAltText: AppOptions.get("enableGuessAltText"),
+        enableAltTextModelDownload: AppOptions.get(
+          "enableAltTextModelDownload"
+        ),
         altTextLearnMoreUrl: AppOptions.get("altTextLearnMoreUrl"),
       });
     }
@@ -390,12 +401,12 @@ const PDFViewerApplication = {
         externalServices,
         AppOptions.get("isInAutomation")
       );
-      if (this.mlManager) {
-        this.mlManager.eventBus = eventBus;
-      }
     } else {
       eventBus = new EventBus();
     }
+    if (this.mlManager) {
+      this.mlManager.eventBus = eventBus;
+    }
     this.eventBus = eventBus;
 
     this.overlayManager = new OverlayManager();
@@ -445,7 +456,11 @@ const PDFViewerApplication = {
     let altTextManager;
     if (AppOptions.get("enableUpdatedAddImage")) {
       altTextManager = appConfig.newAltTextDialog
-        ? new NewAltTextManager(appConfig.newAltTextDialog, this.overlayManager)
+        ? new NewAltTextManager(
+            appConfig.newAltTextDialog,
+            this.overlayManager,
+            eventBus
+          )
         : null;
     } else {
       altTextManager = appConfig.altTextDialog
@@ -479,6 +494,9 @@ const PDFViewerApplication = {
         "enableHighlightFloatingButton"
       ),
       enableUpdatedAddImage: AppOptions.get("enableUpdatedAddImage"),
+      enableNewAltTextWhenAddingImage: AppOptions.get(
+        "enableNewAltTextWhenAddingImage"
+      ),
       imageResourcesPath: AppOptions.get("imageResourcesPath"),
       enablePrintAutoRotate: AppOptions.get("enablePrintAutoRotate"),
       maxCanvasPixels: AppOptions.get("maxCanvasPixels"),
@@ -539,6 +557,15 @@ const PDFViewerApplication = {
       }
     }
 
+    if (appConfig.secondaryToolbar?.imageAltTextSettingsButton) {
+      this.imageAltTextSettings = new ImageAltTextSettings(
+        appConfig.altTextSettingsDialog,
+        this.overlayManager,
+        eventBus,
+        this.mlManager
+      );
+    }
+
     if (appConfig.documentProperties) {
       this.pdfDocumentProperties = new PDFDocumentProperties(
         appConfig.documentProperties,
@@ -579,6 +606,15 @@ const PDFViewerApplication = {
     }
 
     if (appConfig.secondaryToolbar) {
+      if (AppOptions.get("enableAltText")) {
+        appConfig.secondaryToolbar.imageAltTextSettingsButton?.classList.remove(
+          "hidden"
+        );
+        appConfig.secondaryToolbar.imageAltTextSettingsSeparator?.classList.remove(
+          "hidden"
+        );
+      }
+
       this.secondaryToolbar = new SecondaryToolbar(
         appConfig.secondaryToolbar,
         eventBus
@@ -1914,6 +1950,9 @@ const PDFViewerApplication = {
     eventBus._on("scrollmodechanged", webViewerScrollModeChanged, { signal });
     eventBus._on("switchspreadmode", webViewerSwitchSpreadMode, { signal });
     eventBus._on("spreadmodechanged", webViewerSpreadModeChanged, { signal });
+    eventBus._on("imagealttextsettings", webViewerImageAltTextSettings, {
+      signal,
+    });
     eventBus._on("documentproperties", webViewerDocumentProperties, { signal });
     eventBus._on("findfromurlhash", webViewerFindFromUrlHash, { signal });
     eventBus._on("updatefindmatchescount", webViewerUpdateFindMatchesCount, {
@@ -1934,6 +1973,11 @@ const PDFViewerApplication = {
         { signal }
       );
       eventBus._on("reporttelemetry", webViewerReportTelemetry, { signal });
+    }
+    if (
+      typeof PDFJSDev === "undefined" ||
+      PDFJSDev.test("TESTING || MOZCENTRAL")
+    ) {
       eventBus._on("setpreference", webViewerSetPreference, { signal });
     }
   },
@@ -2470,6 +2514,15 @@ function webViewerDocumentProperties() {
   PDFViewerApplication.pdfDocumentProperties?.open();
 }
 
+function webViewerImageAltTextSettings() {
+  PDFViewerApplication.imageAltTextSettings?.open({
+    enableGuessAltText: AppOptions.get("enableGuessAltText"),
+    enableNewAltTextWhenAddingImage: AppOptions.get(
+      "enableNewAltTextWhenAddingImage"
+    ),
+  });
+}
+
 function webViewerFindFromUrlHash(evt) {
   PDFViewerApplication.eventBus.dispatch("find", {
     source: evt.source,