Question

I’m having problem with listening to an event dispatched from a child class, and I don’t know why?

I have to classes:
class 1, witch draws a rectangle and dispatches a custom Event

package
{
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));
    }


}

}

class 2, witch draws another rectangle and listens to the event

package {
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 ");
    }
}

}

and on the fla I have

import clase1;

var c1:clase1 = new clase1();

import clase2;

var c2:clase2 = new clase2();

addChild(c2);

c2.addChild(c1);

, making c2 parent of c1, but no message appears, why??

thankyou

Answer 1

Just a quick glance, it looks like c1 is going to fire the event from it’s constructor before c2 is ever created and adds the event listener. Try firing the event from a different method in c1, and you can call that method after you have called c2.addChild(c1).

If I modify your code just a bit, I am able to see the event be fired

   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));
  }

And then in the main application

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

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