Print Preview: Handling pending print to pdf requests.

chrome/browser/resources/print_preview/print_preview_animations.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Counter used to give webkit animations unique names.
 var animationCounter = 0;
 
 function addAnimation(code) {
   var name = 'anim' + animationCounter;
   animationCounter++;
@@ skipping 60 matching lines @@
 /**
  * Removes the <style> element corrsponding to |animationName| from the DOM.
  * @param {string} animationName The name of the animation to be removed.
  */
 function fadeInOutCleanup(animationName) {
   animEl = document.getElementById(animationName);
   if (animEl)
     animEl.parentNode.removeChild(animEl);
 }
 
-function showLoadingAnimation() {
-  $('dancing-dots-text').classList.remove('hidden');
+/**
+ * Displays |message| followed by three dancing dots animation.
+ */
+function showCustomMessage(message) {
+  $('custom-message-with-dots').innerHTML = message +
+      $('dancing-dots-text').innerHTML;
+  $('custom-message-with-dots').hidden = false;
   var pdfViewer = $('pdf-viewer');
   if (pdfViewer)
     pdfViewer.classList.add('invisible');
   $('overlay-layer').classList.remove('invisible');
 }
 
-function hideLoadingAnimation() {
+/**
+ * Displays the "Preview loading..." animation.
+ */
+function showLoadingAnimation() {
+  showCustomMessage(localStrings.getString('loading'));
+}
+
+/**
+ * Hides the |overlay-layer| and any messages currently displayed.
+ */
+function hideOverlayLayer() {
+  if (hasPendingPrintDocumentRequest)
+    return;
+
   var overlayLayer = $('overlay-layer');
   overlayLayer.addEventListener('webkitTransitionEnd', loadingAnimationCleanup);
   var pdfViewer = $('pdf-viewer');
   if (pdfViewer)
     pdfViewer.classList.remove('invisible');
   overlayLayer.classList.add('invisible');
 }
 
 function loadingAnimationCleanup() {
-  $('dancing-dots-text').classList.add('hidden');
+  $('custom-message-with-dots').hidden = true;
   $('overlay-layer').removeEventListener('webkitTransitionEnd',
                                          loadingAnimationCleanup);
 }