Moves mozPrintCallback specific code to firefox_printservice.js

web/app.js

@@ -143,7 +143,7 @@ var PDFViewerApplication = {
   appConfig: null,
   pdfDocument: null,
   pdfLoadingTask: null,
-  printing: false,
+  printService: null,
   /** @type {PDFViewer} */
   pdfViewer: null,
   /** @type {PDFThumbnailViewer} */
@@ -428,11 +428,12 @@ var PDFViewerApplication = {
     return this.pdfViewer.currentPageNumber;
   },
 
-  get supportsPrinting() {
-    var canvas = document.createElement('canvas');
-    var value = 'mozPrintCallback' in canvas;
+  get printing() {
+    return !!this.printService;
+  },
 
-    return pdfjsLib.shadow(this, 'supportsPrinting', value);
+  get supportsPrinting() {
+    return PDFPrintServiceFactory.instance.supportsPrinting;
   },
 
   get supportsFullscreen() {
@@ -1106,59 +1107,23 @@ var PDFViewerApplication = {
       return;
     }
 
-    var alertNotReady = false;
-    var i, ii;
-    if (!this.pdfDocument || !this.pagesCount) {
-      alertNotReady = true;
-    } else {
-      for (i = 0, ii = this.pagesCount; i < ii; ++i) {
-        if (!this.pdfViewer.getPageView(i).pdfPage) {
-          alertNotReady = true;
-          break;
-        }
-      }
-    }
-    if (alertNotReady) {
+    // The beforePrint is a sync method and we need to know layout before
+    // returning from this method. Ensure that we can get sizes of the pages.
+    if (!this.pdfViewer.pageViewsReady) {
       var notReadyMessage = mozL10n.get('printing_not_ready', null,
           'Warning: The PDF is not fully loaded for printing.');
       window.alert(notReadyMessage);
       return;
     }
 
-    this.printing = true;
+    var pagesOverview = this.pdfViewer.getPagesOverview();
+    var printContainer = this.appConfig.printContainer;
+    var printService = PDFPrintServiceFactory.instance.createPrintService(
+      this.pdfDocument, pagesOverview, printContainer);
+    this.printService = printService;
     this.forceRendering();
 
-    var printContainer = this.appConfig.printContainer;
-    var body = document.querySelector('body');
-    body.setAttribute('data-mozPrintCallback', true);
-
-    if (!this.hasEqualPageSizes) {
-      console.warn('Not all pages have the same size. The printed result ' +
-          'may be incorrect!');
-    }
-
-    // Insert a @page + size rule to make sure that the page size is correctly
-    // set. Note that we assume that all pages have the same size, because
-    // variable-size pages are not supported yet (at least in Chrome & Firefox).
-    // TODO(robwu): Use named pages when size calculation bugs get resolved
-    // (e.g. https://crbug.com/355116) AND when support for named pages is
-    // added (http://www.w3.org/TR/css3-page/#using-named-pages).
-    // In browsers where @page + size is not supported (such as Firefox,
-    // https://bugzil.la/851441), the next stylesheet will be ignored and the
-    // user has to select the correct paper size in the UI if wanted.
-    this.pageStyleSheet = document.createElement('style');
-    var pageSize = this.pdfViewer.getPageView(0).pdfPage.getViewport(1);
-    this.pageStyleSheet.textContent =
-      // "size:<width> <height>" is what we need. But also add "A4" because
-      // Firefox incorrectly reports support for the other value.
-      '@supports ((size:A4) and (size:1pt 1pt)) {' +
-      '@page { size: ' + pageSize.width + 'pt ' + pageSize.height + 'pt;}' +
-      '}';
-    body.appendChild(this.pageStyleSheet);
-
-    for (i = 0, ii = this.pagesCount; i < ii; ++i) {
-      this.pdfViewer.getPageView(i).beforePrint(printContainer);
-    }
+    printService.layout();
 
 //#if !PRODUCTION
     if (true) {
@@ -1186,17 +1151,10 @@ var PDFViewerApplication = {
   },
 
   afterPrint: function pdfViewSetupAfterPrint() {
-    var div = this.appConfig.printContainer;
-    while (div.hasChildNodes()) {
-      div.removeChild(div.lastChild);
+    if (this.printService) {
+      this.printService.destroy();
+      this.printService = null;
     }
-
-    if (this.pageStyleSheet && this.pageStyleSheet.parentNode) {
-      this.pageStyleSheet.parentNode.removeChild(this.pageStyleSheet);
-      this.pageStyleSheet = null;
-    }
-
-    this.printing = false;
     this.forceRendering();
   },
 
@@ -2330,6 +2288,17 @@ window.addEventListener('afterprint', function afterPrint(evt) {
   });
 })();
 
+/* Abstract factory for the print service. */
+var PDFPrintServiceFactory = {
+  instance: {
+    supportsPrinting: false,
+    createPrintService: function () {
+      throw new Error('Not implemented: createPrintService');
+    }
+  }
+};
+
 exports.PDFViewerApplication = PDFViewerApplication;
 exports.DefaultExernalServices = DefaultExernalServices;
+exports.PDFPrintServiceFactory = PDFPrintServiceFactory;
 }));