src/chrome/renderer/resources/extensions/desktop_capture_custom_bindings.js

   1 // Copyright 2013 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 desktopCapture API.
   6
   7 var binding = require('binding').Binding.create('desktopCapture');
   8 var sendRequest = require('sendRequest').sendRequest;
   9 var idGenerator = requireNative('id_generator');
  10
  11 binding.registerCustomHook(function(bindingsAPI) {
  12   var apiFunctions = bindingsAPI.apiFunctions;
  13
  14   var pendingRequests = {};
  15
  16   function onRequestResult(id, result) {
  17     if (id in pendingRequests) {
  18       var callback = pendingRequests[id];
  19       delete pendingRequests[id];
  20       callback(result);
  21     }
  22   }
  23
  24   apiFunctions.setHandleRequest('chooseDesktopMedia',
  25                                 function(sources, target_tab, callback) {
  26     // |target_tab| is an optional parameter.
  27     if (callback === undefined) {
  28       callback = target_tab;
  29       target_tab = undefined;
  30     }
  31     var id = idGenerator.GetNextId();
  32     pendingRequests[id] = callback;
  33     sendRequest(this.name,
  34                 [id, sources, target_tab, onRequestResult.bind(null, id)],
  35                 this.definition.parameters, {});
  36     return id;
  37   });
  38
  39   apiFunctions.setHandleRequest('cancelChooseDesktopMedia', function(id) {
  40     if (id in pendingRequests) {
  41       delete pendingRequests[id];
  42       sendRequest(this.name, [id], this.definition.parameters, {});
  43     }
  44   });
  45 });
  46
  47 exports.binding = binding.generate();