src/chrome/common/extensions/docs/examples/api/tabs/zoom/background.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview In this extension, the background page demonstrates how to
   7  *               listen for zoom change events.
   8 */
   9
  10 function zoomChangeListener(zoomChangeInfo) {
  11   var settings_str = "mode:" + zoomChangeInfo.zoomSettings.mode +
  12       ", scope:" + zoomChangeInfo.zoomSettings.scope;
  13
  14   console.log('[ZoomDemoExtension] zoomChangeListener(tab=' +
  15               zoomChangeInfo.tabId + ', new=' +
  16               zoomChangeInfo.newZoomFactor + ', old=' +
  17               zoomChangeInfo.oldZoomFactor + ', ' +
  18               settings_str + ')');
  19 }
  20
  21 chrome.tabs.onZoomChange.addListener(zoomChangeListener);