phaser/docs/Loader.js.html at bf32590cfe38d0231abfaf76ed7ef2bbdd3719c2 · ITCSsDeveloper/phaser · GitHub

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<!DOCTYPE html>

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<head>
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	<title>Phaser Source: loader/Loader.js</title>

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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 &lt;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.
    * @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 = 3;

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 &lt; 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 &lt; 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 &lt; 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.
    * @return {Phaser.Loader} This Loader instance.
    */
    spritesheet: function (key, url, frameWidth, frameHeight, frameMax, margin, spacing) {

        if (typeof frameMax === "undefined") { frameMax = -1; }
        if (typeof margin === "undefined") { margin = 0; }
        if (typeof spacing === "undefined") { spacing = 0; }

        this.addToFileList('spritesheet', key, url, { frameWidth: frameWidth, frameHeight: frameHeight, frameMax: frameMax, margin: margin, spacing: spacing });

        return this;

    },