var Class = require('../utils/Class'); 
var ProcessQueue = require('../structs/ProcessQueue'); 
var PluginCache = require('../plugins/PluginCache'); 
var SceneEvents = require('../scene/events'); 
var UpdateList = new Class({ 
Extends: ProcessQueue,
initialize: function UpdateList(scene){ 
ProcessQueue.call(this); 
this.checkQueue = true ; 
this.scene = scene; 
this.systems = scene.sys; 
scene.sys.events.once(SceneEvents.BOOT, this.boot, this); 
scene.sys.events.on(SceneEvents.START, this.start, this); 
} 
,
boot: function (){ 
this.systems.events.once(SceneEvents.DESTROY, this.destroy, this); 
} 
,
start: function (){ 
var eventEmitter = this.systems.events; 
eventEmitter.on(SceneEvents.PRE_UPDATE, this.update, this); 
eventEmitter.on(SceneEvents.UPDATE, this.sceneUpdate, this); 
eventEmitter.once(SceneEvents.SHUTDOWN, this.shutdown, this); 
} 
,
sceneUpdate: function (time, delta){ 
var list = this._active; 
var length = _AN_Read_length('length', list); 
for (var i = 0; 
i < length; i++ ){ 
var gameObject = list[i]; 
if (gameObject.active) { 
gameObject.preUpdate.call(gameObject, time, delta); 
} 
} 
} 
,
shutdown: function (){ 
var i = _AN_Read_length('length', this._active); 
while (i-- ){ 
this._active[i].destroy(true ); 
} 
i = _AN_Read_length('length', this._pending); 
while (i-- ){ 
this._pending[i].destroy(true ); 
} 
i = _AN_Read_length('length', this._destroy); 
while (i-- ){ 
this._destroy[i].destroy(true ); 
} 
this._toProcess = 0; 
this._pending = [] ; 
this._active = [] ; 
this._destroy = [] ; 
this.removeAllListeners(); 
var eventEmitter = this.systems.events; 
eventEmitter.off(SceneEvents.PRE_UPDATE, this.preUpdate, this); 
eventEmitter.off(SceneEvents.UPDATE, this.sceneUpdate, this); 
eventEmitter.off(SceneEvents.SHUTDOWN, this.shutdown, this); 
} 
,
destroy: function (){ 
this.shutdown(); 
this.systems.events.off(SceneEvents.START, this.start, this); 
this.scene = null ; 
this.systems = null ; 
} 
}
); 
PluginCache.register('UpdateList', UpdateList, 'updateList'); 
module.exports = UpdateList;