Show MessageWindow from the background page

remoting/webapp/background/message_window_manager.js

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+'use strict';
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+/**
+ * Namespace for window manager functions.
+ * @type {Object}
+ */
+remoting.MessageWindowManager = {};
+
+/**
+ * Mapping from window id to corresponding MessageWindow.
+ *
+ * @type {Object.<number, remoting.MessageWindow>}
+ * @private
+ */
+remoting.MessageWindowManager.messageWindows_ = {};
+
+/**
+ * The next window id to auto-assign.
+ * @type {number}
+ * @private
+ */
+remoting.MessageWindowManager.nextId_ = 1;
+
+/**
+ * @param {remoting.MessageWindow} window The window to associate
+ *     with the window id.
+ * @return {number} The window id.
+ */
+remoting.MessageWindowManager.addMessageWindow = function(window) {
+  var id = ++remoting.MessageWindowManager.nextId_;
+  remoting.MessageWindowManager.messageWindows_[id] = window;
+  return id;
+};
+
+/**
+ * @param {number} id The window id.
+ * @return {remoting.MessageWindow}
+ */
+remoting.MessageWindowManager.getMessageWindow = function(id) {
+  return remoting.MessageWindowManager.messageWindows_[id];
+};
+
+/**
+ * @param {number} id The window id to delete.
+ */
+remoting.MessageWindowManager.deleteMessageWindow = function(id) {
+  delete remoting.MessageWindowManager.messageWindows_[id];
+};
+
+/**
+ * Close all of the registered MessageWindows
+ */
+remoting.MessageWindowManager.closeAllMessageWindows = function() {
+  /** @type {Array.<remoting.MessageWindow>} */
+  var windows = [];
+  // Make a list of the windows to close.
+  // We don't delete the window directly in this loop because close() can
+  // call deleteMessageWindow which will update messageWindows_.
+  for (var win_id in remoting.MessageWindowManager.messageWindows_) {
+    /** @type {remoting.MessageWindow} */
+    var win = remoting.MessageWindowManager.getMessageWindow(
+        /** @type {number} */(win_id));
+    base.debug.assert(win != null);
+    windows.push(win);
+  }
+  for (var i = 0; i < windows.length; i++) {
+    /** @type {remoting.MessageWindow} */(windows[i]).close();
+  }
+};
+
+/**
+ * Dispatch a message box result to the appropriate callback.
+ *
+ * @param {Event} event
+ * @private
+ */
+remoting.MessageWindowManager.onMessage_ = function(event) {
+  if (typeof(event.data) != 'object') {
+    return;
+  }
+
+  if (event.data['command'] == 'messageWindowResult') {
+    var id = /** @type {number} */ (event.data['id']);
+    var result = /** @type {number} */ (event.data['result']);
+
+    if (typeof(id) != 'number' || typeof(result) != 'number') {
+      console.log('Poorly formatted id or result');
+      return;
+    }
+
+    var messageWindow = remoting.MessageWindowManager.getMessageWindow(id);
+    if (!messageWindow) {
+      console.log('Ignoring unknown message window id:', id);
+      return;
+    }
+
+    messageWindow.handleResult(result);
+    messageWindow.close();
+  }
+};
+
+
+window.addEventListener('message', remoting.MessageWindowManager.onMessage_,
+                        false);