async _initializeViewerComponents()

in web/app.js [392:717]
292 lines of code
43 McCabe index (conditional complexity)

  async _initializeViewerComponents() {
    const { appConfig, externalServices, l10n, mlManager } = this;
    const abortSignal = this._globalAbortController.signal;

    const eventBus =
      typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")
        ? new FirefoxEventBus(
            AppOptions.get("allowedGlobalEvents"),
            externalServices,
            AppOptions.get("isInAutomation")
          )
        : new EventBus();
    this.eventBus = AppOptions.eventBus = eventBus;
    mlManager?.setEventBus(eventBus, abortSignal);

    const overlayManager = (this.overlayManager = new OverlayManager());

    const renderingQueue = (this.pdfRenderingQueue = new PDFRenderingQueue());
    renderingQueue.onIdle = this._cleanup.bind(this);

    const linkService = (this.pdfLinkService = new PDFLinkService({
      eventBus,
      externalLinkTarget: AppOptions.get("externalLinkTarget"),
      externalLinkRel: AppOptions.get("externalLinkRel"),
      ignoreDestinationZoom: AppOptions.get("ignoreDestinationZoom"),
    }));

    const downloadManager = (this.downloadManager = new DownloadManager());

    const findController = (this.findController = new PDFFindController({
      linkService,
      eventBus,
      updateMatchesCountOnProgress:
        typeof PDFJSDev === "undefined"
          ? !window.isGECKOVIEW
          : !PDFJSDev.test("GECKOVIEW"),
    }));

    const pdfScriptingManager = (this.pdfScriptingManager =
      new PDFScriptingManager({
        eventBus,
        externalServices,
        docProperties: this._scriptingDocProperties.bind(this),
      }));

    const container = appConfig.mainContainer,
      viewer = appConfig.viewerContainer;
    const annotationEditorMode = AppOptions.get("annotationEditorMode");
    const pageColors =
      AppOptions.get("forcePageColors") ||
      window.matchMedia("(forced-colors: active)").matches
        ? {
            background: AppOptions.get("pageColorsBackground"),
            foreground: AppOptions.get("pageColorsForeground"),
          }
        : null;

    let altTextManager;
    if (AppOptions.get("enableUpdatedAddImage")) {
      altTextManager = appConfig.newAltTextDialog
        ? new NewAltTextManager(
            appConfig.newAltTextDialog,
            overlayManager,
            eventBus
          )
        : null;
    } else {
      altTextManager = appConfig.altTextDialog
        ? new AltTextManager(
            appConfig.altTextDialog,
            container,
            overlayManager,
            eventBus
          )
        : null;
    }

    if (appConfig.editorUndoBar) {
      this.editorUndoBar = new EditorUndoBar(appConfig.editorUndoBar, eventBus);
    }

    const signatureManager =
      AppOptions.get("enableSignatureEditor") && appConfig.addSignatureDialog
        ? new SignatureManager(
            appConfig.addSignatureDialog,
            appConfig.editSignatureDialog,
            appConfig.annotationEditorParams?.editorSignatureAddSignature ||
              null,
            overlayManager,
            l10n,
            externalServices.createSignatureStorage(eventBus, abortSignal),
            eventBus
          )
        : null;

    const enableHWA = AppOptions.get("enableHWA"),
      maxCanvasPixels = AppOptions.get("maxCanvasPixels"),
      maxCanvasDim = AppOptions.get("maxCanvasDim"),
      capCanvasAreaFactor = AppOptions.get("capCanvasAreaFactor");
    const pdfViewer = (this.pdfViewer = new PDFViewer({
      container,
      viewer,
      eventBus,
      renderingQueue,
      linkService,
      downloadManager,
      altTextManager,
      signatureManager,
      editorUndoBar: this.editorUndoBar,
      findController,
      scriptingManager:
        AppOptions.get("enableScripting") && pdfScriptingManager,
      l10n,
      textLayerMode: AppOptions.get("textLayerMode"),
      annotationMode: AppOptions.get("annotationMode"),
      annotationEditorMode,
      annotationEditorHighlightColors: AppOptions.get("highlightEditorColors"),
      enableHighlightFloatingButton: AppOptions.get(
        "enableHighlightFloatingButton"
      ),
      enableUpdatedAddImage: AppOptions.get("enableUpdatedAddImage"),
      enableNewAltTextWhenAddingImage: AppOptions.get(
        "enableNewAltTextWhenAddingImage"
      ),
      imageResourcesPath: AppOptions.get("imageResourcesPath"),
      enablePrintAutoRotate: AppOptions.get("enablePrintAutoRotate"),
      maxCanvasPixels,
      maxCanvasDim,
      capCanvasAreaFactor,
      enableDetailCanvas: AppOptions.get("enableDetailCanvas"),
      enablePermissions: AppOptions.get("enablePermissions"),
      pageColors,
      mlManager,
      abortSignal,
      enableHWA,
      supportsPinchToZoom: this.supportsPinchToZoom,
      enableAutoLinking: AppOptions.get("enableAutoLinking"),
      minDurationToUpdateCanvas: AppOptions.get("minDurationToUpdateCanvas"),
    }));

    renderingQueue.setViewer(pdfViewer);
    linkService.setViewer(pdfViewer);
    pdfScriptingManager.setViewer(pdfViewer);

    if (appConfig.sidebar?.thumbnailView) {
      this.pdfThumbnailViewer = new PDFThumbnailViewer({
        container: appConfig.sidebar.thumbnailView,
        eventBus,
        renderingQueue,
        linkService,
        maxCanvasPixels,
        maxCanvasDim,
        pageColors,
        abortSignal,
        enableHWA,
      });
      renderingQueue.setThumbnailViewer(this.pdfThumbnailViewer);
    }

    // The browsing history is only enabled when the viewer is standalone,
    // i.e. not when it is embedded in a web page.
    if (!this.isViewerEmbedded && !AppOptions.get("disableHistory")) {
      this.pdfHistory = new PDFHistory({
        linkService,
        eventBus,
      });
      linkService.setHistory(this.pdfHistory);
    }

    if (!this.supportsIntegratedFind && appConfig.findBar) {
      this.findBar = new PDFFindBar(
        appConfig.findBar,
        appConfig.principalContainer,
        eventBus
      );
    }

    if (appConfig.annotationEditorParams) {
      if (annotationEditorMode !== AnnotationEditorType.DISABLE) {
        const editorSignatureButton = appConfig.toolbar?.editorSignatureButton;
        if (editorSignatureButton && AppOptions.get("enableSignatureEditor")) {
          editorSignatureButton.parentElement.hidden = false;
        }
        this.annotationEditorParams = new AnnotationEditorParams(
          appConfig.annotationEditorParams,
          eventBus
        );
      } else {
        for (const id of ["editorModeButtons", "editorModeSeparator"]) {
          document.getElementById(id)?.classList.add("hidden");
        }
      }
    }

    if (mlManager && appConfig.secondaryToolbar?.imageAltTextSettingsButton) {
      this.imageAltTextSettings = new ImageAltTextSettings(
        appConfig.altTextSettingsDialog,
        overlayManager,
        eventBus,
        mlManager
      );
    }

    if (appConfig.documentProperties) {
      this.pdfDocumentProperties = new PDFDocumentProperties(
        appConfig.documentProperties,
        overlayManager,
        eventBus,
        l10n,
        /* fileNameLookup = */ () => this._docFilename
      );
    }

    // NOTE: The cursor-tools are unlikely to be helpful/useful in GeckoView,
    // in particular the `HandTool` which basically simulates touch scrolling.
    if (appConfig.secondaryToolbar?.cursorHandToolButton) {
      this.pdfCursorTools = new PDFCursorTools({
        container,
        eventBus,
        cursorToolOnLoad: AppOptions.get("cursorToolOnLoad"),
      });
    }

    if (appConfig.toolbar) {
      if (
        typeof PDFJSDev === "undefined"
          ? window.isGECKOVIEW
          : PDFJSDev.test("GECKOVIEW")
      ) {
        const nimbusData = JSON.parse(
          AppOptions.get("nimbusDataStr") || "null"
        );
        this.toolbar = new Toolbar(appConfig.toolbar, eventBus, nimbusData);
      } else {
        this.toolbar = new Toolbar(
          appConfig.toolbar,
          eventBus,
          AppOptions.get("toolbarDensity")
        );
      }
    }

    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
      );
    }

    if (
      this.supportsFullscreen &&
      appConfig.secondaryToolbar?.presentationModeButton
    ) {
      this.pdfPresentationMode = new PDFPresentationMode({
        container,
        pdfViewer,
        eventBus,
      });
    }

    if (appConfig.passwordOverlay) {
      this.passwordPrompt = new PasswordPrompt(
        appConfig.passwordOverlay,
        overlayManager,
        this.isViewerEmbedded
      );
    }

    if (appConfig.sidebar?.outlineView) {
      this.pdfOutlineViewer = new PDFOutlineViewer({
        container: appConfig.sidebar.outlineView,
        eventBus,
        l10n,
        linkService,
        downloadManager,
      });
    }

    if (appConfig.sidebar?.attachmentsView) {
      this.pdfAttachmentViewer = new PDFAttachmentViewer({
        container: appConfig.sidebar.attachmentsView,
        eventBus,
        l10n,
        downloadManager,
      });
    }

    if (appConfig.sidebar?.layersView) {
      this.pdfLayerViewer = new PDFLayerViewer({
        container: appConfig.sidebar.layersView,
        eventBus,
        l10n,
      });
    }

    if (appConfig.sidebar) {
      this.pdfSidebar = new PDFSidebar({
        elements: appConfig.sidebar,
        eventBus,
        l10n,
      });
      this.pdfSidebar.onToggled = this.forceRendering.bind(this);
      this.pdfSidebar.onUpdateThumbnails = () => {
        // Use the rendered pages to set the corresponding thumbnail images.
        for (const pageView of pdfViewer.getCachedPageViews()) {
          if (pageView.renderingState === RenderingStates.FINISHED) {
            this.pdfThumbnailViewer
              .getThumbnail(pageView.id - 1)
              ?.setImage(pageView);
          }
        }
        this.pdfThumbnailViewer.scrollThumbnailIntoView(
          pdfViewer.currentPageNumber
        );
      };
    }
  },