Question

我在收听从儿童班调度的事件时遇到问题，我不知道为什么？

我必须上课： class 1，witch绘制一个矩形并调度一个自定义事件

包 { import flash.display。; import flash.events。; import flash.text。*;

public class clase1 extends Sprite
{
    private var labelField:TextField;
    public function clase1(label:String = "buttono") {
        // draw the background for the button.
        graphics.beginFill(0x3366CC);
        graphics.drawRect(0, 0, 100, 30);
        // store the label as the button’s name.
        name=label;
        // create a TextField to display the button label.
        labelField = new TextField();
        // ensure clicks are sent from labelField rather than the button.
        labelField.mouseEnabled=false;
        labelField.selectable=false;
        labelField.text=label;
        labelField.x=10;
        labelField.y=10;
        labelField.width=80;
        labelField.height=20;
        addChild(labelField);
        dispatchEvent(new Event("Hello",true));
    }


}

}

第2课，女巫绘制另一个矩形并听取事件

包{ import flash.display。; import flash.events。; import flash.text。*;

public class clase2 extends Sprite {
    private var labelField:TextField;
    public function clase2(label:String = "buttono") {
        // draw the background for the button.
        graphics.beginFill(0xFFFCCC);
        graphics.drawRect(200, 0, 100, 30);
        // store the label as the button’s name.
        name=label;
        // create a TextField to display the button label.
        labelField = new TextField();
        // ensure clicks are sent from labelField rather than the button.
        labelField.mouseEnabled=false;
        labelField.selectable=false;
        labelField.text=label;
        labelField.x=210;
        labelField.y=10;
        labelField.width=80;
        labelField.height=20;
        addChild(labelField);
        addEventListener( "Hello",eventHandler,true);

    }
    function eventHandler( event: Event )
    {
        trace( "event received ");
    }
}

}

在fla上我有

import clase1;

var c1：clase1 = new clase1（）;

import clase2;

var c2：clase2 = new clase2（）;

的addChild（C2）;

c2.addChild（C1）;

，使c1成为c1的父级，但没有出现消息，为什么??

三江源

Answer 1

只需快速浏览一下，看起来c1将在创建c2之前从它的构造函数触发事件并添加事件侦听器。尝试从c1中的其他方法触发事件，然后在调用c2.addChild（c1）后调用该方法。

如果我稍微修改你的代码，我可以看到该事件被解雇

   public function clase1(label:String = "buttono") {
        name=label;
        labelField = new TextField();
        labelField.text=label;
    }

   public function drawRect():void {
      // draw the background for the button.
      graphics.beginFill(0x3366CC);
      graphics.drawRect(0, 0, 100, 30);
      labelField.mouseEnabled=false;
      labelField.selectable=false;
      labelField.x=10;
      labelField.y=10;
      labelField.width=80;
      labelField.height=20;
      addChild(labelField);
  dispatchEvent(new Event("Hello",true));
  }

然后在主应用程序中

public function test():void {
   var c1:clase1 = new clase1();
   var c2:clase2 = new clase2();

   c2.addChild(c1);
   c1.drawRect();
   }

Answer 2

我有一个不同的问题，但我认为它与这个线程一样。因为我的事件监听器没有触发的原因。我知道我的对象正在被创建，因为我可以在输出中看到“listener added”。这是我的代码。

package com.wsh.savage.world {

import com.wsh.savage.world.WorldManager;

import flash.events.Event;
import flash.events.EventDispatcher;

public class WorldState extends EventDispatcher{

    //constants defining worlds state
    private const STATE_STARTING:uint = 0;
    private const STATE_RUNNING:uint = 1;
    private const STATE_PAUSED:uint = 2;
    private const STATE_DESTROYING:uint = 3;

    //an instance of the manager of all world states
    private var m_worldManager:WorldManager;    

    //keeps track of what state the WorldState is in
    private var m_stateStatus:uint;


    /**
     * Constructor starts the state up
     */
    public function WorldState(manager:WorldManager) { 
        //set flag that we are creating a world state
        m_stateStatus = STATE_STARTING;

        m_worldManager = manager;
        this.addEventListener(Event.ENTER_FRAME,enterFrameListener,false,1,true);
        trace('listener added');

        //set the flag that the state is now running
        m_stateStatus = STATE_RUNNING;
    }

    protected function enterFrameListener(event:Event){
        trace('event fired');
        if(m_stateStatus == STATE_RUNNING){
            trace('running');
            m_worldManager.getKeyboardManager().getKeyStatus(40);
        }
    }
}

感谢您的帮助！

EventListener的Flash AS3问题

2 个答案: