question on the scope of the stage object
Hello, all. I am currently working with containers and I have a question about the stage object.
I have 2 files in my program
(1) app.as
(2) stuff.as
Stuff.As is a library of common user interface that I build. I'm trying, in this document, follow these steps:
stuff(){ makeUI(); } makeUI(){ myContainer.setSize(stage.Stagewidth , stage.Stagehight); }
Flash crash when running, saying that there is a reference not valid for a null object.
If main.as is the file of the application, how can I get the stage object to be valid / available inside my stuff.as file?
-Thanks for your time!
Hey dtater,
I met the same problem too in the past. the only way to have access to the stage is to have the class that never work added to the stage by a parent object that is already on scene. If an object has not yet been added to the stage, his stage value will be null.
the best way to work with this set of return must have an event listener defined in your file stuff.as to listen for Event.ADDED event in your stuff() constructor like this:
this.addEventListener(Event.ADDED, onAdded);
and then in your event handler function onAdded:
private function onAdded(e:Event):void{ // this event gets triggered by other objects, so we check to make sure it the right object if (e.target == e.currentTarget) { makeUI(); } }
in this way the makeUI funciton only will be called when it has access to the scene.
Here are more details on the event Event.ADDED:
http://www.Adobe.com/LiveDocs/Flash/9.0/ActionScriptLangRefV3/Flash/events/event.HTML#added
hope that helps. Good luck!
Edit: I also forgot to add that the Event.ADDED event will be called when you addChild (stuff); in your main application.
Tags: BlackBerry Developers
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