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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Phaser Source: loader/Loader.js</title>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link type="text/css" rel="stylesheet" href="styles/sunlight.default.css">
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<h1 class="page-title">Source: loader/Loader.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/* jshint wsh:true */
/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2014 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* Phaser loader constructor.
* The Loader handles loading all external content such as Images, Sounds, Texture Atlases and data files.
* It uses a combination of Image() loading and xhr and provides progress and completion callbacks.
* @class Phaser.Loader
* @classdesc The Loader handles loading all external content such as Images, Sounds, Texture Atlases and data files.
* It uses a combination of Image() loading and xhr and provides progress and completion callbacks.
* @constructor
* @param {Phaser.Game} game - A reference to the currently running game.
*/
Phaser.Loader = function (game) {
/**
* @property {Phaser.Game} game - Local reference to game.
*/
this.game = game;
/**
* @property {array} _fileList - Contains all the assets file infos.
* @private
*/
this._fileList = [];
/**
* @property {number} _fileIndex - The index of the current file being loaded.
* @private
*/
this._fileIndex = 0;
/**
* @property {number} _progressChunk - Indicates the size of 1 file in terms of a percentage out of 100.
* @private
* @default
*/
this._progressChunk = 0;
/**
* @property {XMLHttpRequest} - An XMLHttpRequest object used for loading text and audio data.
* @private
*/
this._xhr = new XMLHttpRequest();
/**
* @property {boolean} isLoading - True if the Loader is in the process of loading the queue.
* @default
*/
this.isLoading = false;
/**
* @property {boolean} hasLoaded - True if all assets in the queue have finished loading.
* @default
*/
this.hasLoaded = false;
/**
* @property {number} progress - The rounded load progress percentage value (from 0 to 100)
* @default
*/
this.progress = 0;
/**
* @property {number} progressFloat - The non-rounded load progress value (from 0.0 to 100.0)
* @default
*/
this.progressFloat = 0;
/**
* You can optionally link a sprite to the preloader.
* If you do so the Sprites width or height will be cropped based on the percentage loaded.
* @property {Phaser.Sprite|Phaser.Image} preloadSprite
* @default
*/
this.preloadSprite = null;
/**
* @property {boolean|string} crossOrigin - The crossOrigin value applied to loaded images. Very often this needs to be set to 'anonymous'.
* @default
*/
this.crossOrigin = false;
/**
* If you want to append a URL before the path of any asset you can set this here.
* Useful if you need to allow an asset url to be configured outside of the game code.
* MUST have / on the end of it!
* @property {string} baseURL
* @default
*/
this.baseURL = '';
/**
* @property {Phaser.Signal} onFileComplete - Event signal.
*/
this.onFileComplete = new Phaser.Signal();
/**
* @property {Phaser.Signal} onFileError - Event signal.
*/
this.onFileError = new Phaser.Signal();
/**
* @property {Phaser.Signal} onLoadStart - Event signal.
*/
this.onLoadStart = new Phaser.Signal();
/**
* @property {Phaser.Signal} onLoadComplete - Event signal.
*/
this.onLoadComplete = new Phaser.Signal();
};
/**
* @constant
* @type {number}
*/
Phaser.Loader.TEXTURE_ATLAS_JSON_ARRAY = 0;
/**
* @constant
* @type {number}
*/
Phaser.Loader.TEXTURE_ATLAS_JSON_HASH = 1;
/**
* @constant
* @type {number}
*/
Phaser.Loader.TEXTURE_ATLAS_XML_STARLING = 2;
/**
* @constant
* @type {number}
*/
Phaser.Loader.PHYSICS_LIME_CORONA_JSON = 3;
/**
* @constant
* @type {number}
*/
Phaser.Loader.PHYSICS_PHASER_JSON = 4;
Phaser.Loader.prototype = {
/**
* You can set a Sprite to be a "preload" sprite by passing it to this method.
* A "preload" sprite will have its width or height crop adjusted based on the percentage of the loader in real-time.
* This allows you to easily make loading bars for games. Note that Sprite.visible = true will be set when calling this.
*
* @method Phaser.Loader#setPreloadSprite
* @param {Phaser.Sprite|Phaser.Image} sprite - The sprite or image that will be cropped during the load.
* @param {number} [direction=0] - A value of zero means the sprite will be cropped horizontally, a value of 1 means its will be cropped vertically.
*/
setPreloadSprite: function (sprite, direction) {
direction = direction || 0;
this.preloadSprite = { sprite: sprite, direction: direction, width: sprite.width, height: sprite.height, rect: null };
if (direction === 0)
{
// Horizontal rect
this.preloadSprite.rect = new Phaser.Rectangle(0, 0, 1, sprite.height);
}
else
{
// Vertical rect
this.preloadSprite.rect = new Phaser.Rectangle(0, 0, sprite.width, 1);
}
sprite.crop(this.preloadSprite.rect);
sprite.visible = true;
},
/**
* Check whether asset exists with a specific key.
*
* @method Phaser.Loader#checkKeyExists
* @param {string} type - The type asset you want to check.
* @param {string} key - Key of the asset you want to check.
* @return {boolean} Return true if exists, otherwise return false.
*/
checkKeyExists: function (type, key) {
if (this._fileList.length > 0)
{
for (var i = 0; i < this._fileList.length; i++)
{
if (this._fileList[i].type === type && this._fileList[i].key === key)
{
return true;
}
}
}
return false;
},
/**
* Gets the fileList index for the given key.
*
* @method Phaser.Loader#getAssetIndex
* @param {string} type - The type asset you want to check.
* @param {string} key - Key of the asset you want to check.
* @return {number} The index of this key in the filelist, or -1 if not found.
*/
getAssetIndex: function (type, key) {
if (this._fileList.length > 0)
{
for (var i = 0; i < this._fileList.length; i++)
{
if (this._fileList[i].type === type && this._fileList[i].key === key)
{
return i;
}
}
}
return -1;
},
/**
* Gets the asset that is queued for load.
*
* @method Phaser.Loader#getAsset
* @param {string} type - The type asset you want to check.
* @param {string} key - Key of the asset you want to check.
* @return {any} Returns an object if found that has 2 properties: index and file. Otherwise false.
*/
getAsset: function (type, key) {
if (this._fileList.length > 0)
{
for (var i = 0; i < this._fileList.length; i++)
{
if (this._fileList[i].type === type && this._fileList[i].key === key)
{
return { index: i, file: this._fileList[i] };
}
}
}
return false;
},
/**
* Reset loader, this will remove the load queue.
*
* @method Phaser.Loader#reset
*/
reset: function () {
this.preloadSprite = null;
this.isLoading = false;
this._fileList.length = 0;
this._fileIndex = 0;
},
/**
* Internal function that adds a new entry to the file list. Do not call directly.
*
* @method Phaser.Loader#addToFileList
* @param {string} type - The type of resource to add to the list (image, audio, xml, etc).
* @param {string} key - The unique Cache ID key of this resource.
* @param {string} url - The URL the asset will be loaded from.
* @param {object} properties - Any additional properties needed to load the file.
* @protected
*/
addToFileList: function (type, key, url, properties) {
var entry = {
type: type,
key: key,
url: url,
data: null,
error: false,
loaded: false
};
if (typeof properties !== "undefined")
{
for (var prop in properties)
{
entry[prop] = properties[prop];
}
}
if (this.checkKeyExists(type, key) === false)
{
this._fileList.push(entry);
}
},
/**
* Internal function that replaces an existing entry in the file list with a new one. Do not call directly.
*
* @method Phaser.Loader#replaceInFileList
* @param {string} type - The type of resource to add to the list (image, audio, xml, etc).
* @param {string} key - The unique Cache ID key of this resource.
* @param {string} url - The URL the asset will be loaded from.
* @param {object} properties - Any additional properties needed to load the file.
* @protected
*/
replaceInFileList: function (type, key, url, properties) {
var entry = {
type: type,
key: key,
url: url,
data: null,
error: false,
loaded: false
};
if (typeof properties !== "undefined")
{
for (var prop in properties)
{
entry[prop] = properties[prop];
}
}
var index = this.getAssetIndex(type, key);
if (index === -1)
{
this._fileList.push(entry);
}
else
{
this._fileList[index] = entry;
}
},
/**
* Add an image to the Loader.
*
* @method Phaser.Loader#image
* @param {string} key - Unique asset key of this image file.
* @param {string} url - URL of image file.
* @param {boolean} [overwrite=false] - If an unloaded file with a matching key already exists in the queue, this entry will overwrite it.
* @return {Phaser.Loader} This Loader instance.
*/
image: function (key, url, overwrite) {
if (typeof overwrite === "undefined") { overwrite = false; }
if (overwrite)
{
this.replaceInFileList('image', key, url);
}
else
{
this.addToFileList('image', key, url);
}
return this;
},
/**
* Add a text file to the Loader.
*
* @method Phaser.Loader#text
* @param {string} key - Unique asset key of the text file.
* @param {string} url - URL of the text file.
* @param {boolean} [overwrite=false] - If an unloaded file with a matching key already exists in the queue, this entry will overwrite it.
* @return {Phaser.Loader} This Loader instance.
*/
text: function (key, url, overwrite) {
if (typeof overwrite === "undefined") { overwrite = false; }
if (overwrite)
{
this.replaceInFileList('text', key, url);
}
else
{
this.addToFileList('text', key, url);
}
return this;
},
/**
* Add a json file to the Loader.
*
* @method Phaser.Loader#json
* @param {string} key - Unique asset key of the json file.
* @param {string} url - URL of the json file.
* @param {boolean} [overwrite=false] - If an unloaded file with a matching key already exists in the queue, this entry will overwrite it.
* @return {Phaser.Loader} This Loader instance.
*/
json: function (key, url, overwrite) {
if (typeof overwrite === "undefined") { overwrite = false; }
if (overwrite)
{
this.replaceInFileList('json', key, url);
}
else
{
this.addToFileList('json', key, url);
}
return this;
},
/**
* Add a JavaScript file to the Loader. Once loaded the JavaScript file will be automatically turned into a script tag (and executed), so be careful what you load!
* You can also specify a callback. This will be executed as soon as the script tag has been created.
*
* @method Phaser.Loader#script
* @param {string} key - Unique asset key of the script file.
* @param {string} url - URL of the JavaScript file.
* @param {function} [callback] - Optional callback that will be called after the script tag has loaded, so you can perform additional processing.
* @param {function} [callbackContext] - The context under which the callback will be applied. If not specified it will use the callback itself as the context.
* @return {Phaser.Loader} This Loader instance.
*/
script: function (key, url, callback, callbackContext) {
if (typeof callback === 'undefined') { callback = false; }
if (callback !== false && typeof callbackContext === 'undefined') { callbackContext = callback; }
this.addToFileList('script', key, url, { callback: callback, callbackContext: callbackContext });
return this;
},
/**
* Add a binary file to the Loader. It will be loaded via xhr with a responseType of "arraybuffer". You can specify an optional callback to process the file after load.
* When the callback is called it will be passed 2 parameters: the key of the file and the file data.
* WARNING: If you specify a callback, the file data will be set to whatever your callback returns. So always return the data object, even if you didn't modify it.
*
* @method Phaser.Loader#binary
* @param {string} key - Unique asset key of the binary file.
* @param {string} url - URL of the binary file.
* @param {function} [callback] - Optional callback that will be passed the file after loading, so you can perform additional processing on it.
* @param {function} [callbackContext] - The context under which the callback will be applied. If not specified it will use the callback itself as the context.
* @return {Phaser.Loader} This Loader instance.
*/
binary: function (key, url, callback, callbackContext) {
if (typeof callback === 'undefined') { callback = false; }
if (callback !== false && typeof callbackContext === 'undefined') { callbackContext = callback; }
this.addToFileList('binary', key, url, { callback: callback, callbackContext: callbackContext });
return this;
},
/**
* Add a new sprite sheet to the loader.
*
* @method Phaser.Loader#spritesheet
* @param {string} key - Unique asset key of the sheet file.
* @param {string} url - URL of the sheet file.
* @param {number} frameWidth - Width of each single frame.
* @param {number} frameHeight - Height of each single frame.
* @param {number} [frameMax=-1] - How many frames in this sprite sheet. If not specified it will divide the whole image into frames.
* @param {number} [margin=0] - If the frames have been drawn with a margin, specify the amount here.
* @param {number} [spacing=0] - If the frames have been drawn with spacing between them, specify the amount here.