Containment Events : Sprite « Development « Flash / Flex / ActionScript

1. Flash / Flex / ActionScript
2. Development
3. Sprite

Containment Events

 

package {
  import flash.display.*;
  import flash.events.*;

  public class Main extends Sprite {
    public function Main() {
      var container:Sprite = new Sprite(  );
      var child:Sprite = new Sprite(  );
      var grandchild:Sprite = new Sprite(  );

      container.addEventListener(Event.ADDED, addedListener);
      container.addEventListener(Event.REMOVED, removedListener);

      container.addChild(child);  
      child.addChild(grandchild);  
      stage.addChild(container);
      child.removeChild(grandchild);
      stage.removeChild(container);
    }

    private function addedListener (e:Event):void {
      if (e.eventPhase != EventPhase.AT_TARGET) {
        trace("container has a new descendant: " + e.target);
      } else {
        trace("container was added to a new parent: "
              + DisplayObject(e.target).parent);
      }
    }

    private function removedListener (e:Event):void {
      if (e.eventPhase != EventPhase.AT_TARGET) {
        trace("a descendant was removed from container: " + e.target);
      } else {
        trace("container was removed from its parent: "
              + DisplayObject(e.target).parent);
      }
    }
  }
}

        

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