[Chromoting] Create core Application interface for CRD.

remoting/webapp/base/js/application.js

Index: remoting/webapp/base/js/application.js
diff --git a/remoting/webapp/base/js/application.js b/remoting/webapp/base/js/application.js
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+// 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.
+
+/**
+ * @fileoverview
+ * Interface abstracting the Application functionality.
+ */
+
+'use strict';
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+/**
+ * @constructor
+ */
+remoting.Application = function() {
+  /**
+   * @type {remoting.Application.Delegate}
+   * @private
+   */
+  this.delegate_ = null;
+
+  /**
+   * @type {remoting.SessionConnector}
+   * @private
+   */
+  this.session_connector_ = null;
+};
+
+/**
+ * @param {remoting.Application.Delegate} appDelegate The delegate that
+ *    contains the app-specific functionality.
+ */
+remoting.Application.prototype.setDelegate = function(appDelegate) {
+  this.delegate_ = appDelegate;
+};
+
+/**
+ * Initialize the application and register all event handlers. After this
+ * is called, the app is running and waiting for user events.
+ *
+ * @return {void} Nothing.
+ */
+remoting.Application.prototype.init = function() {
+  this.delegate_.init();
+};
+
+/**
+ * Called when a new session has been connected.
+ *
+ * @param {remoting.ClientSession} clientSession
+ * @return {void} Nothing.
+ */
+remoting.Application.prototype.onConnected = function(clientSession) {
+  // TODO(garykac): Make clientSession a member var of Application.
+  remoting.clientSession = clientSession;
+  remoting.clientSession.addEventListener('stateChanged', onClientStateChange_);
+
+  remoting.clipboard.startSession();
+  updateStatistics_();
+  remoting.hangoutSessionEvents.raiseEvent(
+      remoting.hangoutSessionEvents.sessionStateChanged,
+      remoting.ClientSession.State.CONNECTED
+  );
+
+  this.delegate_.onConnected(clientSession);
+};
+
+/**
+ * Called when the current session has been disconnected.
+ *
+ * @return {void} Nothing.
+ */
+remoting.Application.prototype.onDisconnected = function() {
+  this.delegate_.onDisconnected();
+};
+
+/**
+ * Called when the current session has reached the point where the host has
+ * started streaming video frames to the client.
+ *
+ * @return {void} Nothing.
+ */
+remoting.Application.prototype.onVideoStreamingStarted = function() {
+  this.delegate_.onVideoStreamingStarted();
+};
+
+/**
+ * Called when an extension message needs to be handled.
+ *
+ * @param {string} type The type of the extension message.
+ * @param {string} data The payload of the extension message.
+ * @return {boolean} Return true if the extension message was recognized.
+ */
+remoting.Application.prototype.onExtensionMessage = function(type, data) {
+  return this.delegate_.onExtensionMessage(type, data);
+};
+
+/**
+ * Called when an error needs to be displayed to the user.
+ *
+ * @param {remoting.Error} errorTag The error to be localized and displayed.
+ * @return {void} Nothing.
+ */
+remoting.Application.prototype.onError = function(errorTag) {
+  this.delegate_.onError(errorTag);
+};
+
+/**
+ * @return {remoting.SessionConnector} A session connector, creating a new one
+ *     if necessary.
+ */
+remoting.Application.prototype.getSessionConnector = function() {
+  // TODO(garykac): Check if this can be initialized in the ctor.
+  if (!this.session_connector_) {
+    this.session_connector_ = remoting.SessionConnector.factory.createConnector(
+        document.getElementById('video-container'),
+        this.onConnected.bind(this),
+        this.onError.bind(this),
+        this.onExtensionMessage.bind(this));
+  }
+  return this.session_connector_;
+};
+
+
+/**
+ * @interface
+ */
+remoting.Application.Delegate = function() {};
+
+/**
+ * Initialize the application and register all event handlers. After this
+ * is called, the app is running and waiting for user events.
+ *
+ * @return {void} Nothing.
+ */
+remoting.Application.Delegate.prototype.init = function() {};
+
+/**
+ * Called when a new session has been connected.
+ *
+ * @param {remoting.ClientSession} clientSession
+ * @return {void} Nothing.
+ */
+remoting.Application.Delegate.prototype.onConnected = function(clientSession) {
+};
+
+/**
+ * Called when the current session has been disconnected.
+ *
+ * @return {void} Nothing.
+ */
+remoting.Application.Delegate.prototype.onDisconnected = function() {};
+
+/**
+ * Called when the current session has reached the point where the host has
+ * started streaming video frames to the client.
+ *
+ * @return {void} Nothing.
+ */
+remoting.Application.Delegate.prototype.onVideoStreamingStarted = function() {};
+
+/**
+ * Called when an extension message needs to be handled.
+ *
+ * @param {string} type The type of the extension message.
+ * @param {string} data The payload of the extension message.
+ * @return {boolean} Return true if the extension message was recognized.
+ */
+remoting.Application.Delegate.prototype.onExtensionMessage = function(
+    type, data) {};
+
+/**
+ * Called when an error needs to be displayed to the user.
+ *
+ * @param {remoting.Error} errorTag The error to be localized and displayed.
+ * @return {void} Nothing.
+ */
+remoting.Application.Delegate.prototype.onError = function(errorTag) {};
+
+
+/** @type {remoting.Application} */
+remoting.app = null;