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src_pixi_loaders_AssetLoader.js.html
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<h1 class="file-heading">File: src/pixi/loaders/AssetLoader.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* A Class that loads a bunch of images / sprite sheet / bitmap font files. Once the
* assets have been loaded they are added to the PIXI Texture cache and can be accessed
* easily through PIXI.Texture.fromImage() and PIXI.Sprite.fromImage()
* When all items have been loaded this class will dispatch a 'onLoaded' event
* As each individual item is loaded this class will dispatch a 'onProgress' event
*
* @class AssetLoader
* @constructor
* @uses EventTarget
* @param assetURLs {Array<String>} An array of image/sprite sheet urls that you would like loaded
* supported. Supported image formats include 'jpeg', 'jpg', 'png', 'gif'. Supported
* sprite sheet data formats only include 'JSON' at this time. Supported bitmap font
* data formats include 'xml' and 'fnt'.
* @param crossorigin {Boolean} Whether requests should be treated as crossorigin
*/
PIXI.AssetLoader = function(assetURLs, crossorigin)
{
/**
* The array of asset URLs that are going to be loaded
*
* @property assetURLs
* @type Array<String>
*/
this.assetURLs = assetURLs;
/**
* Whether the requests should be treated as cross origin
*
* @property crossorigin
* @type Boolean
*/
this.crossorigin = crossorigin;
/**
* Maps file extension to loader types
*
* @property loadersByType
* @type Object
*/
this.loadersByType = {
'jpg': PIXI.ImageLoader,
'jpeg': PIXI.ImageLoader,
'png': PIXI.ImageLoader,
'gif': PIXI.ImageLoader,
'webp': PIXI.ImageLoader,
'json': PIXI.JsonLoader,
'atlas': PIXI.AtlasLoader,
'anim': PIXI.SpineLoader,
'xml': PIXI.BitmapFontLoader,
'fnt': PIXI.BitmapFontLoader
};
};
PIXI.EventTarget.mixin(PIXI.AssetLoader.prototype);
/**
* Fired when an item has loaded
* @event onProgress
*/
/**
* Fired when all the assets have loaded
* @event onComplete
*/
// constructor
PIXI.AssetLoader.prototype.constructor = PIXI.AssetLoader;
/**
* Given a filename, returns its extension.
*
* @method _getDataType
* @param str {String} the name of the asset
*/
PIXI.AssetLoader.prototype._getDataType = function(str)
{
var test = 'data:';
//starts with 'data:'
var start = str.slice(0, test.length).toLowerCase();
if (start === test) {
var data = str.slice(test.length);
var sepIdx = data.indexOf(',');
if (sepIdx === -1) //malformed data URI scheme
return null;
//e.g. 'image/gif;base64' => 'image/gif'
var info = data.slice(0, sepIdx).split(';')[0];
//We might need to handle some special cases here...
//standardize text/plain to 'txt' file extension
if (!info || info.toLowerCase() === 'text/plain')
return 'txt';
//User specified mime type, try splitting it by '/'
return info.split('/').pop().toLowerCase();
}
return null;
};
/**
* Starts loading the assets sequentially
*
* @method load
*/
PIXI.AssetLoader.prototype.load = function()
{
var scope = this;
function onLoad(evt) {
scope.onAssetLoaded(evt.data.content);
}
this.loadCount = this.assetURLs.length;
for (var i=0; i < this.assetURLs.length; i++)
{
var fileName = this.assetURLs[i];
//first see if we have a data URI scheme..
var fileType = this._getDataType(fileName);
//if not, assume it's a file URI
if (!fileType)
fileType = fileName.split('?').shift().split('.').pop().toLowerCase();
var Constructor = this.loadersByType[fileType];
if(!Constructor)
throw new Error(fileType + ' is an unsupported file type');
var loader = new Constructor(fileName, this.crossorigin);
loader.on('loaded', onLoad);
loader.load();
}
};
/**
* Invoked after each file is loaded
*
* @method onAssetLoaded
* @private
*/
PIXI.AssetLoader.prototype.onAssetLoaded = function(loader)
{
this.loadCount--;
this.emit('onProgress', { content: this, loader: loader });
if (this.onProgress) this.onProgress(loader);
if (!this.loadCount)
{
this.emit('onComplete', { content: this });
if(this.onComplete) this.onComplete();
}
};
</pre>
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