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<!DOCTYPE html>
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<title>Phaser Source: core/ArrayList.js</title>
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<h1 class="page-title">Source: core/ArrayList.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2014 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* A set data structure. Allows items to add themselves to and remove themselves from the set. Items can only exist once in the set.
*
* @class Phaser.ArrayList
* @constructor
*/
Phaser.ArrayList = function () {
/**
* @property {number} total - Number of objects in the list.
* @default
*/
this.total = 0;
/**
* @property {number} position - Current cursor position.
* @default
*/
this.position = 0;
/**
* @property {array} list - The list.
*/
this.list = [];
};
Phaser.ArrayList.prototype = {
/**
* Adds a new element to this list. The item can only exist in the list once.
*
* @method Phaser.ArrayList#add
* @param {object} child - The element to add to this list. Can be a Phaser.Sprite or any other object you need to quickly iterate through.
* @return {object} The child that was added.
*/
add: function (child) {
if (!this.exists(child))
{
this.list.push(child);
this.total++;
}
return child;
},
/**
* Gets the index of the child in the list, or -1 if it isn't in the list.
*
* @method Phaser.ArrayList#getIndex
* @param {object} child - The element to get the list index for.
* @return {number} The index of the child or -1 if not found.
*/
getIndex: function (child) {
return this.list.indexOf(child);
},
/**
* Checks for the child within this list.
*
* @method Phaser.ArrayList#exists
* @param {object} child - The element to get the list index for.
* @return {boolean} True if the child is found in the list, otherwise false.
*/
exists: function (child) {
return (this.list.indexOf(child) > -1);
},
/**
* Resets the list length and drops all items in the list.
*
* @method Phaser.ArrayList#reset
*/
reset: function () {
this.list.length = 0;
this.total = 0;
},
/**
* Removes the given element from this list if it exists.
*
* @method Phaser.ArrayList#remove
* @param {object} child - The child to be removed from the list.
* @return {object} child - The child that was removed.
*/
remove: function (child) {
var idx = this.list.indexOf(child);
if (idx > -1)
{
this.list.splice(idx, 1);
this.total--;
return child;
}
},
/**
* Calls a function on all members of this list, using the member as the context for the callback.
* The function must exist on the member.
*
* @method Phaser.ArrayList#callAll
* @param {function} callback - The function to call.
* @param {...*} parameter - Additional parameters that will be passed to the callback.
*/
callAll: function (callback) {
var args = Array.prototype.splice.call(arguments, 1);
var i = this.list.length;
while (i--)
{
if (this.list[i] && this.list[i][callback])
{
this.list[i][callback].apply(this.list[i], args);
}
}
}
};
/**
* Resets the cursor to the first item in the list and returns it.
*
* @name Phaser.ArrayList#first
* @property {object} first - The first item in the list.
*/
Object.defineProperty(Phaser.ArrayList.prototype, "first", {
get: function () {
this.position = 0;
if (this.total > 0)
{
return this.list[0];
}
else
{
return null;
}
}
});
/**
* Gets the next item in the list and returns it, advancing the cursor.
*
* @name Phaser.ArrayList#next
* @property {object} next - Advanced the cursor and return.
*/
Object.defineProperty(Phaser.ArrayList.prototype, "next", {
get: function () {
if (this.position < this.total)
{
this.position++;
return this.list[this.position];
}
else
{
return null;
}
}
});
Phaser.ArrayList.prototype.constructor = Phaser.ArrayList;
</pre>
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