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// Copyright (c) 2011 The Native Client 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 The tumbler Application object. This object instantiates a
* Trackball object and connects it to the element named |tumbler_content|.
* It also conditionally embeds a debuggable module or a release module into
* the |tumbler_content| element.
*/
// Requires tumbler
// Requires tumbler.Dragger
// Requires tumbler.Trackball
/**
* Constructor for the Application class. Use the run() method to populate
* the object with controllers and wire up the events.
* @constructor
*/
tumbler.Application = function() {
/**
* The native module for the application. This refers to the module loaded
* via the <embed> tag.
* @type {Element}
* @private
*/
this.module_ = null;
/**
* The trackball object.
* @type {tumbler.Trackball}
* @private
*/
this.trackball_ = null;
/**
* The mouse-drag event object.
* @type {tumbler.Dragger}
* @private
*/
this.dragger_ = null;
/**
* The function objects that get attached as event handlers. These are
* cached so that they can be removed when they are no longer needed.
* @type {function}
* @private
*/
this.boundModuleDidLoad_ = null;
}
/**
* The ids used for elements in the DOM. The Tumlber Application expects these
* elements to exist.
* @enum {string}
* @private
*/
tumbler.Application.DomIds_ = {
MODULE: 'tumbler', // The <embed> element representing the NaCl module
VIEW: 'tumbler_view' // The <div> containing the NaCl element.
}
/**
* Called by the module loading function once the module has been loaded.
* @param {?Element} nativeModule The instance of the native module.
*/
tumbler.Application.prototype.moduleDidLoad = function() {
this.module_ = document.getElementById(tumbler.Application.DomIds_.MODULE);
// Unbind the load function.
this.boundModuleDidLoad_ = null;
/**
* Set the camera orientation property on the NaCl module.
* @param {Array.<number>} orientation A 4-element array representing the
* camera orientation as a quaternion.
*/
this.module_.setCameraOrientation = function(orientation) {
var methodString = 'setCameraOrientation ' +
'orientation:' +
JSON.stringify(orientation);
this.postMessage(methodString);
}
this.trackball_ = new tumbler.Trackball();
this.dragger_ = new tumbler.Dragger(this.module_);
this.dragger_.addDragListener(this.trackball_);
}
/**
* Asserts that cond is true; issues an alert and throws an Error otherwise.
* @param {bool} cond The condition.
* @param {String} message The error message issued if cond is false.
*/
tumbler.Application.prototype.assert = function(cond, message) {
if (!cond) {
message = "Assertion failed: " + message;
alert(message);
throw new Error(message);
}
}
/**
* The run() method starts and 'runs' the application. The trackball object
* is allocated and all the events get wired up.
* @param {?String} opt_contentDivName The id of a DOM element in which to
* embed the Native Client module. If unspecified, defaults to
* VIEW. The DOM element must exist.
*/
tumbler.Application.prototype.run = function(opt_contentDivName) {
contentDivName = opt_contentDivName || tumbler.Application.DomIds_.VIEW;
var contentDiv = document.getElementById(contentDivName);
this.assert(contentDiv, "Missing DOM element '" + contentDivName + "'");
// Note that the <EMBED> element is wrapped inside a <DIV>, which has a 'load'
// event listener attached. This method is used instead of attaching the
// 'load' event listener directly to the <EMBED> element to ensure that the
// listener is active before the NaCl module 'load' event fires.
this.boundModuleDidLoad_ = this.moduleDidLoad.bind(this);
contentDiv.addEventListener('load', this.boundModuleDidLoad_, true);
// Load the published .nexe. This includes the 'nacl' attribute which
// shows how to load multi-architecture modules. Each entry in the "nexes"
// object in the .nmf manifest file is a key-value pair: the key is the
// runtime ('x86-32', 'x86-64', etc.); the value is a URL for the desired
// NaCl module. To load the debug versions of your .nexes, set the 'nacl'
// attribute to the _dbg.nmf version of the manifest file.
contentDiv.innerHTML = '<embed id="'
+ tumbler.Application.DomIds_.MODULE + '" '
+ 'src=tumbler.nmf '
+ 'type="application/x-nacl" '
+ 'width="480" height="480" />'
}
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