extensions/renderer/resources/unload_event.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 // Special unload event. We don't use the DOM unload because that slows down
   6 // tab shutdown. On the other hand, onUnload might not always fire, since
   7 // Chrome will terminate renderers on shutdown (SuddenTermination).
   8
   9 // Implement a primitive subset of the Event interface as needed, since if this
  10 // was to use the real event object there would be a circular dependency.
  11 var listeners = [];
  12
  13 exports.addListener = function(listener) {
  14   $Array.push(listeners, listener);
  15 };
  16
  17 exports.removeListener = function(listener) {
  18   for (var i = 0; i < listeners.length; ++i) {
  19     if (listeners[i] == listener) {
  20       $Array.splice(listeners, i, 1);
  21       return;
  22     }
  23   }
  24 };
  25
  26 exports.wasDispatched = false;
  27
  28 // dispatch() is called from C++.
  29 exports.dispatch = function() {
  30   exports.wasDispatched = true;
  31   for (var i = 0; i < listeners.length; ++i)
  32     listeners[i]();
  33 };