【发布时间】：2011-04-09 10:12:19
【问题描述】：
我想向滑块的父级添加一个侦听器，该滑块从非 gui 类 EventDispatcherManager 接收事件。所以我试图获取应该返回主类的滑块的父级，但它不起作用。如何获取实例化另一个（这里是滑块类）的对象（这里是主类）？
package {
import fl.controls.Slider;
import fl.events.SliderEvent;
import flash.events.*;
internal class EventDispatcherManager extends EventDispatcher
{
public function EventDispatcherManager(slider:IEventDispatcher)
{
slider.addEventListener(SliderEvent.CHANGE, onSliderChange);
// 1119: Access of possibly undefined property parent through a reference with static type flash.events:IEventDispatcher.
slider.parent.addEventListener(CustomEvent.CUSTOM_EVENT_TYPE, onCustomEventType);
this.addEventListener(CustomEvent.CUSTOM_EVENT_TYPE, onCustomEventType);
}// end function
private function onSliderChange(e:SliderEvent):void
{
this.dispatchEvent(new CustomEvent(CustomEvent.CUSTOM_EVENT_TYPE, e.value));
}// end function
private function onCustomEventType(e:CustomEvent):void
{
trace(e.value);
}// end function
}// end function
}
package
{
import flash.display.Sprite;
import flash.events.Event;
public class main extends Sprite
{
private var _sliderSprite:SliderSprite;
private var _eventDispatcherManager:EventDispatcherManager;
public function main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}// end function
private function init(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
_sliderSprite = new SliderSprite();
_sliderSprite.x = (stage.stageWidth / 2);
_sliderSprite.y = (stage.stageHeight / 2);
addChild(_sliderSprite);
}// end function
private function onCustomEventType(e:CustomEvent):void
{
trace("hello");
}// end function
}// end class
}// end package
package {
import flash.display.Sprite;
import flash.events.IEventDispatcher;
import fl.controls.Slider;
public class SliderSprite extends Sprite
{
private var _slider:Slider;
private var _eventDispatcherManager:EventDispatcherManager;
public function SliderSprite()
{
init();
}// end function
private function init():void
{
_slider = new Slider();
addChild(_slider);
_eventDispatcherManager = new EventDispatcherManager(IEventDispatcher(_slider));
}// end function
}// end class
}
package {
import flash.events.Event;
internal class CustomEvent extends Event {
public static const CUSTOM_EVENT_TYPE:String = "customEventType";
private var _value:Number;
public function get value():Number
{
return _value;
}// end function
public function CustomEvent(type:String,
value:Number,
bubbles:Boolean = false,
cancelable:Boolean = false)
{
_value = value;
super(type, bubbles, cancelable);
}// end function
override public function clone():Event
{
return new CustomEvent(type, value, bubbles, cancelable);
}// end function
}// end class
}
更新：现在我确实转换为 DisplayObject 并使用 .parent.parent ，因为滑块在另一个类 sliderSprite 中，但现在我得到了 null！那么是不是用 Flash 就不可能得到 Instance Creator 呢？
package {
import flash.display.*;
import fl.controls.Slider;
import fl.events.SliderEvent;
import flash.events.*;
internal class EventDispatcherManager extends EventDispatcher
{
public function EventDispatcherManager(slider:IEventDispatcher)
{
slider.addEventListener(SliderEvent.CHANGE, onSliderChange);
// 1119: Access of possibly undefined property parent through a reference with static type flash.events:IEventDispatcher.
(slider as DisplayObject).parent.addEventListener(CustomEvent.CUSTOM_EVENT_TYPE, onCustomEventType);
trace((slider as DisplayObject).parent.parent);
this.addEventListener(CustomEvent.CUSTOM_EVENT_TYPE, onCustomEventType);
}// end function
private function onSliderChange(e:SliderEvent):void
{
this.dispatchEvent(new CustomEvent(CustomEvent.CUSTOM_EVENT_TYPE, e.value));
}// end function
private function onCustomEventType(e:CustomEvent):void
{
trace(e.value);
}// end function
}// end function
}
【问题讨论】：
-
它也没有被识别，因为它可能还没有出现在舞台上这就是为什么我需要引用 INSTANCE CREATOR。
标签： flash actionscript-3