Bug 1338094 - [Mortar] Support keyboard copy. f=lchang, r=evelyn

MozReview-Commit-ID: KvLR3Ajio1n

--HG--
extra : rebase_source : 3eb74758d258e928f6ed25284ecf69d8bef462c4

browser/extensions/mortar/host/pdf/chrome/js/viewport.js

@@ -4,6 +4,8 @@
 
 'use strict';
 
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
 class Viewport {
   constructor() {
     this._viewerContainer = document.getElementById('viewerContainer');
@@ -39,6 +41,7 @@ class Viewport {
     this.onPasswordRequest = null;
 
     this._viewportController.addEventListener('scroll', this);
+    this._viewportController.addEventListener('copy', this);
     window.addEventListener('resize', this);
   }
 
@@ -475,6 +478,15 @@ class Viewport {
     }
   }
 
+  _copyToClipboard(text) {
+    if (!text) {
+      return;
+    }
+    const gClipboardHelper = Cc["@mozilla.org/widget/clipboardhelper;1"]
+                                .getService(Ci.nsIClipboardHelper);
+    gClipboardHelper.copyString(text);
+  }
+
   verifyPassword(password) {
     this._doAction({
       type: 'getPasswordComplete',
@@ -495,6 +507,12 @@ class Viewport {
           this._refresh();
         }
         break;
+      case 'copy':
+        this._doAction({
+          type: 'getSelectedText'
+        })
+        evt.preventDefault();
+        break;
     }
   }
 
@@ -608,6 +626,11 @@ class Viewport {
       case 'getPassword':
         this.onPasswordRequest && this.onPasswordRequest();
         break;
+      case 'getSelectedTextReply':
+        // For now this message is used only by text copy so we handle just
+        // that case.
+        this._copyToClipboard(message.selectedText);
+        break;
     }
   }
 }