Moves thumbs logic into PDFThumbnailViewer.

web/thumbnail_view.js

@@ -14,16 +14,18 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals PDFView, mozL10n, RenderingStates */
+/* globals mozL10n, RenderingStates, THUMBNAIL_SCROLL_MARGIN,
+           watchScroll, getVisibleElements, scrollIntoView */
 
 'use strict';
 
-var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
+var ThumbnailView = function thumbnailView(container, id, defaultViewport,
+                                           linkService, renderingQueue) {
   var anchor = document.createElement('a');
-  anchor.href = PDFView.getAnchorUrl('#page=' + id);
+  anchor.href = linkService.getAnchorUrl('#page=' + id);
   anchor.title = mozL10n.get('thumb_page_title', {page: id}, 'Page {{page}}');
   anchor.onclick = function stopNavigation() {
-    PDFView.page = id;
+    linkService.page = id;
     return false;
   };
 
@@ -62,6 +64,7 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
 
   this.hasImage = false;
   this.renderingState = RenderingStates.INITIAL;
+  this.renderingQueue = renderingQueue;
 
   this.setPdfPage = function thumbnailViewSetPdfPage(pdfPage) {
     this.pdfPage = pdfPage;
@@ -125,7 +128,7 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
 
   this.draw = function thumbnailViewDraw(callback) {
     if (!this.pdfPage) {
-      var promise = PDFView.getPage(this.id);
+      var promise = this.renderingQueue.getPage(this.id);
       promise.then(function(pdfPage) {
         this.setPdfPage(pdfPage);
         this.draw(callback);
@@ -150,7 +153,7 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
       canvasContext: ctx,
       viewport: drawViewport,
       continueCallback: function(cont) {
-        if (PDFView.highestPriorityPage !== 'thumbnail' + self.id) {
+        if (self.renderingQueue.highestPriorityPage !== 'thumbnail' + self.id) {
           self.renderingState = RenderingStates.PAUSED;
           self.resume = function() {
             self.renderingState = RenderingStates.RUNNING;
@@ -187,7 +190,7 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
 
   this.setImage = function thumbnailViewSetImage(img) {
     if (!this.pdfPage) {
-      var promise = PDFView.getPage(this.id);
+      var promise = this.renderingQueue.getPage(this.id);
       promise.then(function(pdfPage) {
         this.setPdfPage(pdfPage);
         this.setImage(img);
@@ -232,3 +235,95 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
 };
 
 ThumbnailView.tempImageCache = null;
+
+var PDFThumbnailViewer = (function pdfThumbnailViewer() {
+  function PDFThumbnailViewer(options) {
+    this.container = options.container;
+    this.renderingQueue = options.renderingQueue;
+    this.linkService = options.linkService;
+
+    this.scroll = watchScroll(this.container, this.scrollUpdated.bind(this));
+    this.thumbnails = [];
+    this.currentPage = -1;
+  }
+
+  PDFThumbnailViewer.prototype = {
+    scrollUpdated: function PDFThumbnailViewer_scrollUpdated() {
+      this.renderingQueue.renderHighestPriority();
+    },
+
+    getVisibleThumbs: function PDFThumbnailViewer_getVisibleThumbs() {
+      return getVisibleElements(this.container, this.thumbnails);
+    },
+
+    updatePage: function (page) {
+      var selected = document.querySelector('.thumbnail.selected');
+      if (selected) {
+        selected.classList.remove('selected');
+      }
+      var thumbnail = document.getElementById('thumbnailContainer' + page);
+      thumbnail.classList.add('selected');
+      var visibleThumbs = this.getVisibleThumbs();
+      var numVisibleThumbs = visibleThumbs.views.length;
+
+      // If the thumbnail isn't currently visible, scroll it into view.
+      if (numVisibleThumbs > 0) {
+        var first = visibleThumbs.first.id;
+        // Account for only one thumbnail being visible.
+        var last = (numVisibleThumbs > 1 ? visibleThumbs.last.id : first);
+        if (page <= first || page >= last) {
+          scrollIntoView(thumbnail, { top: THUMBNAIL_SCROLL_MARGIN });
+        }
+      }
+      this.currentPage = page;
+    },
+
+    updateRotation: function (pageRotation) {
+      for (var i = 0, l = this.thumbnails.length; i < l; i++) {
+        var thumb = this.thumbnails[i];
+        thumb.update(pageRotation);
+      }
+    },
+
+    cleanup: function PDFThumbnailViewer_cleanup() {
+      ThumbnailView.tempImageCache = null;
+    },
+
+    removeAllThumbnails: function PDFThumbnailViewer_cleanup() {
+      var thumbsView = this.container;
+      while (thumbsView.hasChildNodes()) {
+        thumbsView.removeChild(thumbsView.lastChild);
+      }
+      this.thumbnails = [];
+    },
+
+    addThumbnail: function PDFThumbnailViewer_addThumbnail(pageNum, viewport,
+                                                           linkService) {
+      var thumbnail = new ThumbnailView(this.container, pageNum, viewport,
+                                        this.linkService, this.renderingQueue);
+      this.thumbnails.push(thumbnail);
+      return thumbnail;
+    },
+
+    ensureThumbnailVisible:
+        function PDFThumbnailViewer_ensureThumbnailVisible(page) {
+      // Ensure that the thumbnail of the current page is visible
+      // when switching from another view.
+      scrollIntoView(document.getElementById('thumbnailContainer' + page));
+    },
+
+    forceRendering: function () {
+      var visibleThumbs = this.getVisibleThumbs();
+      var thumbView = this.renderingQueue.getHighestPriority(visibleThumbs,
+                                                             this.thumbnails,
+                                                             this.scroll.down);
+      if (thumbView) {
+        this.renderingQueue.renderView(thumbView, 'thumbnail');
+        return true;
+      }
+      return false;
+    }
+  };
+
+  return PDFThumbnailViewer;
+})();

web/viewer.js

@@ -17,7 +17,7 @@
 /* globals PDFJS, PDFBug, FirefoxCom, Stats, Cache, ProgressBar,
            DownloadManager, getFileName, scrollIntoView, getPDFFileNameFromURL,
            PDFHistory, Preferences, SidebarView, ViewHistory, PageView,
-           ThumbnailView, URL, noContextMenuHandler, SecondaryToolbar,
+           PDFThumbnailViewer, URL, noContextMenuHandler, SecondaryToolbar,
            PasswordPrompt, PresentationMode, HandTool, Promise,
            DocumentProperties, DocumentOutlineView, DocumentAttachmentsView,
            OverlayManager, PDFFindController, PDFFindBar, getVisibleElements,
@@ -108,19 +108,17 @@ var currentPageNumber = 1;
 
 var PDFView = {
   pages: [],
-  thumbnails: [],
   currentScale: UNKNOWN_SCALE,
   currentScaleValue: null,
   initialBookmark: document.location.hash.substring(1),
   container: null,
-  thumbnailContainer: null,
   initialized: false,
   fellback: false,
   pdfDocument: null,
   sidebarOpen: false,
   printing: false,
   pageViewScroll: null,
-  thumbnailViewScroll: null,
+  pdfThumbnailViewer: null,
   pageRotation: 0,
   mouseScrollTimeStamp: 0,
   mouseScrollDelta: 0,
@@ -137,12 +135,12 @@ var PDFView = {
     var container = this.container = document.getElementById('viewerContainer');
     this.pageViewScroll = watchScroll(container, updateViewarea);
 
-    var thumbnailContainer = this.thumbnailContainer =
-                             document.getElementById('thumbnailView');
-    this.thumbnailViewScroll = watchScroll(thumbnailContainer, function () {
-      this.renderHighestPriority();
-    }.bind(this));
-
+    var thumbnailContainer = document.getElementById('thumbnailView');
+    this.pdfThumbnailViewer = new PDFThumbnailViewer({
+      container: thumbnailContainer,
+      renderingQueue: this,
+      linkService: this
+    });
 
     Preferences.initialize();
 
@@ -591,10 +589,7 @@ var PDFView = {
     this.pdfDocument.destroy();
     this.pdfDocument = null;
 
-    var thumbsView = document.getElementById('thumbnailView');
-    while (thumbsView.hasChildNodes()) {
-      thumbsView.removeChild(thumbsView.lastChild);
-    }
+    this.pdfThumbnailViewer.removeAllThumbnails();
 
     var container = document.getElementById('viewer');
     while (container.hasChildNodes()) {
@@ -953,7 +948,6 @@ var PDFView = {
 
     var pages = this.pages = [];
     var pagesRefMap = this.pagesRefMap = {};
-    var thumbnails = this.thumbnails = [];
 
     var resolvePagesPromise;
     var pagesPromise = new Promise(function (resolve) {
@@ -963,7 +957,7 @@ var PDFView = {
 
     var firstPagePromise = pdfDocument.getPage(1);
     var container = document.getElementById('viewer');
-    var thumbsView = document.getElementById('thumbnailView');
+    var thumbsViewer = this.pdfThumbnailViewer;
 
     // Fetch a single page so we can get a viewport that will be the default
     // viewport for all pages
@@ -974,11 +968,9 @@ var PDFView = {
         var pageView = new PageView(container, pageNum, scale,
                                     self.navigateTo.bind(self),
                                     viewportClone);
-        var thumbnailView = new ThumbnailView(thumbsView, pageNum,
-                                              viewportClone);
+        var thumbnailView = thumbsViewer.addThumbnail(pageNum, viewportClone);
         bindOnAfterDraw(pageView, thumbnailView);
         pages.push(pageView);
-        thumbnails.push(thumbnailView);
       }
 
       // Fetch all the pages since the viewport is needed before printing
@@ -1239,12 +1231,7 @@ var PDFView = {
     }
     // No pages needed rendering so check thumbnails.
     if (this.sidebarOpen) {
-      var visibleThumbs = this.getVisibleThumbs();
-      var thumbView = this.getHighestPriority(visibleThumbs,
-                                              this.thumbnails,
-                                              this.thumbnailViewScroll.down);
-      if (thumbView) {
-        this.renderView(thumbView, 'thumbnail');
+      if (this.pdfThumbnailViewer.forceRendering()) {
         return;
       }
     }
@@ -1268,7 +1255,7 @@ var PDFView = {
     }
     this.pdfDocument.cleanup();
 
-    ThumbnailView.tempImageCache = null;
+    this.pdfThumbnailViewer.cleanup();
   },
 
   getHighestPriority: function pdfViewGetHighestPriority(visible, views,
@@ -1424,10 +1411,7 @@ var PDFView = {
         PDFView.renderHighestPriority();
 
         if (wasAnotherViewVisible) {
-          // Ensure that the thumbnail of the current page is visible
-          // when switching from another view.
-          scrollIntoView(document.getElementById('thumbnailContainer' +
-                                                 this.page));
+          this.pdfThumbnailViewer.ensureThumbnailVisible(this.page);
         }
         break;
 
@@ -1472,10 +1456,6 @@ var PDFView = {
     }
   },
 
-  getVisibleThumbs: function pdfViewGetVisibleThumbs() {
-    return getVisibleElements(this.thumbnailContainer, this.thumbnails);
-  },
-
   // Helper function to parse query string (e.g. ?param1=value&parm2=...).
   parseQueryString: function pdfViewParseQueryString(query) {
     var parts = query.split('&');
@@ -1552,10 +1532,7 @@ var PDFView = {
       page.update(page.scale, this.pageRotation);
     }
 
-    for (i = 0, l = this.thumbnails.length; i < l; i++) {
-      var thumb = this.thumbnails[i];
-      thumb.update(this.pageRotation);
-    }
+    this.pdfThumbnailViewer.updateRotation(this.pageRotation);
 
     this.setScale(this.currentScaleValue, true, true);
 
@@ -2131,24 +2108,7 @@ window.addEventListener('pagechange', function pagechange(evt) {
   var page = evt.pageNumber;
   if (PDFView.previousPageNumber !== page) {
     document.getElementById('pageNumber').value = page;
-    var selected = document.querySelector('.thumbnail.selected');
-    if (selected) {
-      selected.classList.remove('selected');
-    }
-    var thumbnail = document.getElementById('thumbnailContainer' + page);
-    thumbnail.classList.add('selected');
-    var visibleThumbs = PDFView.getVisibleThumbs();
-    var numVisibleThumbs = visibleThumbs.views.length;
-
-    // If the thumbnail isn't currently visible, scroll it into view.
-    if (numVisibleThumbs > 0) {
-      var first = visibleThumbs.first.id;
-      // Account for only one thumbnail being visible.
-      var last = (numVisibleThumbs > 1 ? visibleThumbs.last.id : first);
-      if (page <= first || page >= last) {
-        scrollIntoView(thumbnail, { top: THUMBNAIL_SCROLL_MARGIN });
-      }
-    }
+    PDFView.pdfThumbnailViewer.updatePage(page);
   }
   var numPages = PDFView.pages.length;