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ProcessQueue.js
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192 lines (162 loc) · 3.8 KB
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/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2018 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
var Class = require('../utils/Class');
/**
* @classdesc
* [description]
*
* @class ProcessQueue
* @memberOf Phaser.Structs
* @constructor
* @since 3.0.0
*/
var ProcessQueue = new Class({
initialize:
function ProcessQueue ()
{
/**
* [description]
*
* @name Phaser.Structs.ProcessQueue#_pending
* @type {array}
* @private
* @default []
* @since 3.0.0
*/
this._pending = [];
/**
* [description]
*
* @name Phaser.Structs.ProcessQueue#_active
* @type {array}
* @private
* @default []
* @since 3.0.0
*/
this._active = [];
/**
* [description]
*
* @name Phaser.Structs.ProcessQueue#_destroy
* @type {array}
* @private
* @default []
* @since 3.0.0
*/
this._destroy = [];
/**
* [description]
*
* @name Phaser.Structs.ProcessQueue#_toProcess
* @type {integer}
* @private
* @default 0
* @since 3.0.0
*/
this._toProcess = 0;
},
/**
* [description]
*
* @method Phaser.Structs.ProcessQueue#add
* @since 3.0.0
*
* @param {any} item - [description]
*
* @return {Phaser.Structs.ProcessQueue} This Process Queue object.
*/
add: function (item)
{
this._pending.push(item);
this._toProcess++;
return this;
},
/**
* [description]
*
* @method Phaser.Structs.ProcessQueue#remove
* @since 3.0.0
*
* @param {any} item - [description]
*
* @return {Phaser.Structs.ProcessQueue} This Process Queue object.
*/
remove: function (item)
{
this._destroy.push(item);
this._toProcess++;
return this;
},
/**
* [description]
*
* @method Phaser.Structs.ProcessQueue#update
* @since 3.0.0
*
* @return {array} [description]
*/
update: function ()
{
if (this._toProcess === 0)
{
// Quick bail
return this._active;
}
var list = this._destroy;
var active = this._active;
var i;
var item;
// Clear the 'destroy' list
for (i = 0; i < list.length; i++)
{
item = list[i];
// Remove from the 'active' array
var idx = active.indexOf(item);
if (idx !== -1)
{
active.splice(idx, 1);
}
}
list.length = 0;
// Process the pending addition list
// This stops callbacks and out of sync events from populating the active array mid-way during an update
list = this._pending;
for (i = 0; i < list.length; i++)
{
item = list[i];
this._active.push(item);
}
list.length = 0;
this._toProcess = 0;
// The owner of this queue can now safely do whatever it needs to with the active list
return this._active;
},
/**
* [description]
*
* @method Phaser.Structs.ProcessQueue#getActive
* @since 3.0.0
*
* @return {array} [description]
*/
getActive: function ()
{
return this._active;
},
/**
* [description]
*
* @method Phaser.Structs.ProcessQueue#destroy
* @since 3.0.0
*/
destroy: function ()
{
this._pending = [];
this._active = [];
this._destroy = [];
}
});
module.exports = ProcessQueue;