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      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);
     22