chrome/renderer/resources/extensions/experimental.offscreenTabs_custom_bindings.js

   1 // Copyright (c) 2012 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 // Custom binding for the experimental offscreenTabs API.
   6
   7 var binding = require('binding').Binding.create('experimental.offscreenTabs');
   8
   9 binding.registerCustomHook(
  10     'experimental.offscreenTabs', function(api) {
  11   var apiFunctions = api.apiFunctions;
  12
  13   function maybeCopy(src, prop, dest) {
  14     if (src[prop] !== undefined)
  15       dest[prop] = src[prop];
  16   };
  17
  18   function keyboardEventFilter(e) {
  19     var result = {
  20       type: e.type,
  21       ctrlKey: e.ctrlKey,
  22       shiftKey: e.shiftKey,
  23       altKey: e.altKey,
  24       metaKey: e.metaKey,
  25     };
  26     maybeCopy(e, 'keyCode', result);
  27     maybeCopy(e, 'charCode', result);
  28     return result;
  29   };
  30
  31   function mouseEventFilter(e) {
  32     var result = {
  33       type: e.type,
  34       ctrlKey: e.ctrlKey,
  35       shiftKey: e.shiftKey,
  36       altKey: e.altKey,
  37       metaKey: e.metaKey,
  38       button: e.button,
  39     };
  40     maybeCopy(e, 'wheelDeltaX', result);
  41     maybeCopy(e, 'wheelDeltaY', result);
  42     return result;
  43   };
  44
  45   // We are making a copy of |arr|, but applying |func| to index 1.
  46   function validate(arr, func) {
  47     var newArr = [];
  48     for (var i = 0; i < arr.length; i++) {
  49       $Array.push(newArr,
  50                   i == 1 && typeof(arr) == 'object' ? func(arr[i]) : arr[i]);
  51     }
  52     return newArr;
  53   }
  54
  55   apiFunctions.setUpdateArgumentsPreValidate(
  56       'sendKeyboardEvent',
  57       function() { return validate(arguments, keyboardEventFilter); });
  58   apiFunctions.setUpdateArgumentsPreValidate(
  59       'sendMouseEvent',
  60       function() { return validate(arguments, mouseEventFilter); });
  61 });
  62
  63 exports.binding = binding.generate();