Refactors PDFHistory.

extensions/b2g/viewer.js

@@ -30,6 +30,8 @@ var MAX_SCALE = 10.0;
 var PDFViewerApplication = {
   pdfDocument: null,
   pdfViewer: null,
+  pdfHistory: null,
+  pdfLinkService: null,
   loading: true,
   updateScaleControls: false,
 
@@ -44,6 +46,8 @@ var PDFViewerApplication = {
       // Document loaded, specifying document for the viewer.
       this.pdfDocument = pdfDocument;
       this.pdfViewer.setDocument(pdfDocument);
+      this.pdfLinkService.setDocument(pdfDocument);
+      this.pdfHistory.initialize(pdfDocument.fingerprint);
     }.bind(this));
   },
 
@@ -103,11 +107,21 @@ var PDFViewerApplication = {
   },
 
   initUI: function pdfViewInitUI() {
+    var linkService = new PDFJS.PDFLinkService();
+    this.pdfLinkService = linkService;
+
     var container = document.getElementById('viewerContainer');
     var pdfViewer = new PDFJS.PDFViewer({
-      container: container
+      container: container,
+      linkService: linkService
     });
     this.pdfViewer = pdfViewer;
+    linkService.setViewer(pdfViewer);
+
+    this.pdfHistory = new PDFJS.PDFHistory({
+      linkService: linkService
+    });
+    linkService.setHistory(this.pdfHistory);
 
     container.addEventListener('pagesinit', function () {
       // we can use pdfViewer now, e.g. let's change default scale.

web/interfaces.js

@@ -59,6 +59,17 @@ IPDFLinkService.prototype = {
   cachePageRef: function (pageNum, pageRef) {},
 };
 
+/**
+ * @interface
+ */
+function IPDFHistory() {}
+IPDFHistory.prototype = {
+  forward: function () {},
+  back: function () {},
+  push: function (params) {},
+  updateNextHashParam: function (hash) {},
+};
+
 /**
  * @interface
  */