Example
package {
import flash.display.Sprite;
import flash.events.Event;
public class Viewport extends Sprite {
/** Constructor */
public function Viewport() {
super();
// Listen for added to stage event
addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
}
/** Added to stage handler */
protected function addedToStageHandler(event:Event):void {
// Remove added to stage event listener
removeEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
// Listen for removed from stage event
addEventListener(Event.REMOVED_FROM_STAGE, removedFromStageHandler);
}
/** Removed from stage handler */
protected function removedFromStageHandler(event:Event):void {
// Remove removed from stage event listener
removeEventListener(Event.REMOVED_FROM_STAGE, removedFromStageHandler);
// Listen for added to stage event
addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
}
/** Dispose */
public function dispose():void {
// Remove added to stage event listener
removeEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
// Remove removed from stage event listener
removeEventListener(Event.REMOVED_FROM_STAGE, removedFromStageHandler);
}
}
}
