Refactor the options passed to |PresentationMode.initialize| and clean-up some code in viewer.js and presentation_mode.js

This patch:
 - Passes in a reference to the current PDFThumbnailViewer, which is used to ensure that the current thumbnail becomes visible when exiting PresentationMode.

 - Changes the way that the event listeners for the contextmenu items are defined, to avoid passing in a reference to the SecondaryToolbar.

 - Ensures that |supportsFullscreen| always returns a boolean.
   Currently `supportsFullscreen` will, when the browser supports the fullscreen API, return e.g. `function mozRequestFullScreen()` instead of `true`.

 - Simplifies the |click| handler code when PresentationMode is active.
   This code has been obsolete ever since PR 2919 landed.

 - Removes hack used to workaround a bug in WebKit browsers, which caused |mousemove| events to be fired when the cursor changed.
   This was fixed close to a year ago, see http://code.google.com/p/chromium/issues/detail?id=103041.

web/presentation_mode.js

@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals scrollIntoView, PDFViewerApplication */
+/* globals PDFViewerApplication */
 
 'use strict';
 
@@ -27,41 +27,26 @@ var PresentationMode = {
   active: false,
   args: null,
   contextMenuOpen: false,
-//#if (GENERIC || CHROME)
-  prevCoords: { x: null, y: null },
-//#endif
   mouseScrollTimeStamp: 0,
   mouseScrollDelta: 0,
 
   initialize: function presentationModeInitialize(options) {
     this.initialized = true;
     this.container = options.container;
-    this.secondaryToolbar = options.secondaryToolbar;
+    this.pdfThumbnailViewer = options.pdfThumbnailViewer || null;
+    var contextMenuItems = options.contextMenuItems || null;
 
     this.viewer = this.container.firstElementChild;
 
-    this.firstPage = options.firstPage;
-    this.lastPage = options.lastPage;
-    this.pageRotateCw = options.pageRotateCw;
-    this.pageRotateCcw = options.pageRotateCcw;
-
-    this.firstPage.addEventListener('click', function() {
-      this.contextMenuOpen = false;
-      this.secondaryToolbar.firstPageClick();
-    }.bind(this));
-    this.lastPage.addEventListener('click', function() {
-      this.contextMenuOpen = false;
-      this.secondaryToolbar.lastPageClick();
-    }.bind(this));
-
-    this.pageRotateCw.addEventListener('click', function() {
-      this.contextMenuOpen = false;
-      this.secondaryToolbar.pageRotateCwClick();
-    }.bind(this));
-    this.pageRotateCcw.addEventListener('click', function() {
-      this.contextMenuOpen = false;
-      this.secondaryToolbar.pageRotateCcwClick();
-    }.bind(this));
+    if (contextMenuItems) {
+      for (var i = 0, ii = contextMenuItems.length; i < ii; i++) {
+        var item = contextMenuItems[i];
+        item.element.addEventListener('click', function (handler) {
+          this.contextMenuOpen = false;
+          handler();
+        }.bind(this, item.handler));
+      }
+    }
   },
 
   get isFullscreen() {
@@ -186,9 +171,11 @@ var PresentationMode = {
     this.container.removeAttribute('contextmenu');
     this.contextMenuOpen = false;
 
-    // Ensure that the thumbnail of the current page is visible
-    // when exiting presentation mode.
-    scrollIntoView(document.getElementById('thumbnailContainer' + page));
+    if (this.pdfThumbnailViewer) {
+      // Ensure that the thumbnail of the current page is visible
+      // when exiting presentation mode.
+      this.pdfThumbnailViewer.ensureThumbnailVisible(page);
+    }
   },
 
   showControls: function presentationModeShowControls() {
@@ -213,19 +200,6 @@ var PresentationMode = {
   },
 
   mouseMove: function presentationModeMouseMove(evt) {
-//#if (GENERIC || CHROME)
-    // Workaround for a bug in WebKit browsers that causes the 'mousemove' event
-    // to be fired when the cursor is changed. For details, see:
-    // http://code.google.com/p/chromium/issues/detail?id=103041.
-
-    var currCoords = { x: evt.clientX, y: evt.clientY };
-    var prevCoords = PresentationMode.prevCoords;
-    PresentationMode.prevCoords = currCoords;
-
-    if (currCoords.x === prevCoords.x && currCoords.y === prevCoords.y) {
-      return;
-    }
-//#endif
     PresentationMode.showControls();
   },
 

web/viewer.js

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 /* globals PDFJS, PDFBug, FirefoxCom, Stats, Cache, ProgressBar,
-           DownloadManager, getFileName, scrollIntoView, getPDFFileNameFromURL,
+           DownloadManager, getFileName, getPDFFileNameFromURL,
            PDFHistory, Preferences, SidebarView, ViewHistory, Stats,
            PDFThumbnailViewer, URL, noContextMenuHandler, SecondaryToolbar,
            PasswordPrompt, PresentationMode, HandTool, Promise,
@@ -188,13 +188,20 @@ var PDFViewerApplication = {
     });
 
     if (this.supportsFullscreen) {
+      var toolbar = SecondaryToolbar;
       PresentationMode.initialize({
         container: container,
-        secondaryToolbar: SecondaryToolbar,
-        firstPage: document.getElementById('contextFirstPage'),
-        lastPage: document.getElementById('contextLastPage'),
-        pageRotateCw: document.getElementById('contextPageRotateCw'),
-        pageRotateCcw: document.getElementById('contextPageRotateCcw')
+        pdfThumbnailViewer: this.pdfThumbnailViewer,
+        contextMenuItems: [
+          { element: document.getElementById('contextFirstPage'),
+            handler: toolbar.firstPageClick.bind(toolbar) },
+          { element: document.getElementById('contextLastPage'),
+            handler: toolbar.lastPageClick.bind(toolbar) },
+          { element: document.getElementById('contextPageRotateCw'),
+            handler: toolbar.pageRotateCwClick.bind(toolbar) },
+          { element: document.getElementById('contextPageRotateCcw'),
+            handler: toolbar.pageRotateCcwClick.bind(toolbar) }
+        ]
       });
     }
 
@@ -317,8 +324,8 @@ var PDFViewerApplication = {
 
   get supportsFullscreen() {
     var doc = document.documentElement;
-    var support = doc.requestFullscreen || doc.mozRequestFullScreen ||
-                  doc.webkitRequestFullScreen || doc.msRequestFullscreen;
+    var support = !!(doc.requestFullscreen || doc.mozRequestFullScreen ||
+                     doc.webkitRequestFullScreen || doc.msRequestFullscreen);
 
     if (document.fullscreenEnabled === false ||
         document.mozFullScreenEnabled === false ||
@@ -1936,15 +1943,9 @@ window.addEventListener('DOMMouseScroll', handleMouseWheel);
 window.addEventListener('mousewheel', handleMouseWheel);
 
 window.addEventListener('click', function click(evt) {
-  if (!PDFViewerApplication.pdfViewer.isInPresentationMode) {
-    if (SecondaryToolbar.opened &&
-        PDFViewerApplication.pdfViewer.containsElement(evt.target)) {
-      SecondaryToolbar.close();
-    }
-  } else if (evt.button === 0) {
-    // Necessary since preventDefault() in 'mousedown' won't stop
-    // the event propagation in all circumstances in presentation mode.
-    evt.preventDefault();
+  if (SecondaryToolbar.opened &&
+      PDFViewerApplication.pdfViewer.containsElement(evt.target)) {
+    SecondaryToolbar.close();
   }
 }, false);