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Signals problem

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kakarlus

15 May, 2012 08:05 AM

im getting this error:
ArgumentError: Listener has 0 arguments but it needs at least 1 to match the given value classes.

at org.osflash.signals::Signal/registerListener()
at org.osflash.signals::Signal/add()
at org.robotlegs.base::SignalCommandMap/mapSignal()
at org.robotlegs.base::SignalCommandMap/mapSignalClass()
at lib::MyContext/startup()
at org.robotlegs.mvcs::Context/checkAutoStartup()
at org.robotlegs.mvcs::Context()
at org.robotlegs.mvcs::SignalContext()
at lib::MyContext()
at Main()

i have this on MyContext
public var resizeSignal:Signal = new Signal(StageVO); ... signalCommandMap.mapSignalClass(StageResized, StageResizeCommand); ... contextView.addEventListener(Event.RESIZE, stageResized);

and this listner

`private function stageResized(e:Event):void{

        var stageVO:StageVO = new StageVO();
        stageVO.width = contextView.stage.stageWidth;
        stageVO.height = contextView.stage.stageHeight;
        resizeSignal.dispatch(stageVO);
    }`

any help would be appreciated

thanks,
carlos

1. 2 Posted by matt on 15 May, 2012 09:34 AM

   

   i think you want to map a singleton instance of StageResized before you map the StageResized signal to the StageResizeCommand, and then get that signal to dispatch in your event handler. StageResized should extend Signal with a StageVO argument.

   class StageResized extends Signal
   { function StageResized() {

     super( StageVO );
   

   } }

   then in your context:
   public var resizeSignal : StageResized = new StageResized();
   injector.mapValue( StageResized, resizeSignal );

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2. 3 Posted by kakarlus on 15 May, 2012 10:15 AM

   

   hi matt,

   i updated my Signal library and did what you advised. however my StageResizeCommand is not called :s

   contextView.stage.addEventListener(Event.RESIZE, stageResized);

   `private function stageResized(e:Event):void{

           var stageVO:StageVO = new StageVO();
           stageVO.width = contextView.stage.stageWidth;
           stageVO.height = contextView.stage.stageHeight;
           resizeSignal.dispatch(stageVO);
       }`
   

   thanks,
   carlos

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3. 4 Posted by kakarlus on 15 May, 2012 10:38 AM

   

   heres my SignalCommand class

   `package lib.controller.commands {

   import org.robotlegs.mvcs.SignalCommand;
   import lib.model.vos.StageVO;
   import flash.external.ExternalInterface;
   
   public class StageResizeCommand extends SignalCommand{
   
       [Inject]
       public var stageVO:StageVO;
   
       override public function execute():void{
           ExternalInterface.call("console.log('wakeke stage resize wohoo!')");
       }
   }
   

   }`

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4. Support Staff 5 Posted by Ondina D.F. on 15 May, 2012 01:54 PM

   

   Hi Carlos,

   It seems you want to dispatch your signal from within your context, right?

   -Mappings: //injector.mapSingleton(StageVO);

   injector.mapSingleton(StageResized);

   signalCommandMap.mapSignalClass(StageResized, StageResizeCommand);

   -In your handler method:

   var resizeSignal: StageResized;
   var stageVO:StageVO = new StageVO();
   stageVO.width = contextView.stage.stageWidth;
   stageVO.height = contextView.stage.stageHeight;

   resizeSignal=injector.getInstance(StageResized);

   resizeSignal.dispatch(StageVO);

   This should actually work.
   Try it and let us know whether it solved your problem or not.

   Ondina

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5. 6 Posted by kakarlus on 16 May, 2012 02:42 AM

   

   hi ondina it worked :D thanks very much to matt & u.

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6. 7 Posted by kakarlus on 16 May, 2012 04:30 AM

   

   next problem is how am i going to send that signal from my StageResizeCommand -> ComponentModel -> ComponentMediator -> ComponentView

   if im going to use the eventMap.mapListener in my mediator, its defeating the purpose of me using signals right?

   what should i do in my model to make a signal connection to the mediator and then to the view.

   thanks,
   carlos

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7. Support Staff 8 Posted by Ondina D.F. on 16 May, 2012 08:07 AM

   

   Hey Carlos,

   You’re welcome, and I’m glad our combined efforts have led to a solution :)

   if im going to use the eventMap.mapListener in my mediator, its defeating the purpose of me using signals right?

   Well, what can I say? Of course you can use both, events and signals. You’ll have to decide about that, depending on the size and structure of your application. You can trigger a command by dispatching a signal, and another command by dispatching an event, or trigger a command through signals and let the model dispatch an event, as you said, but it would be kind of confusing, especially in a large application. It’s all a matter of personal preference. There are many discussions about that on this forum. One of them:
   http://knowledge.robotlegs.org/discussions/problems/509-large-numbe...

   what should i do in my model to make a signal connection to the mediator and then to the view.

   You would map your signal in your Context:

   injector.mapSingleton(StageVO);

   injector.mapSingleton(StageResizeSignal);

   You would inject your signal in your model:

   [Inject] public var resizeSignal: StageResizeSignal;

   and when needed you’d dispatch it:
   resizeSignal.dispatch(stageVO);

   In your Mediator:
   [Inject] public var resizeSignal: StageResizeSignal;

   override public function onRegister():void
   {

   resizeSignal.add(onStageResized);
   …

   protected function onStageResized (value: StageVO):void
   {

   view.doSomethingWith(value);
   }

   Does this answer your question?

   Have you looked at examples using signals already?
   Here is a list of demos, examples, tutorials:
   http://knowledge.robotlegs.org/discussions/resources/33-links-to-ro...
   Just in case you didn’t know about this ;)

   If you search for signals you’ll find lots of entries.
   Cheers,
   Ondina

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8. 9 Posted by kakarlus on 16 May, 2012 09:28 AM

   

   ahh so thats how a signal works (didnt do my research). i got really confused what .add() was for, now i know its for adding a listener to the signal.

   really helped me there cheers ondina.

   thanks,
   carlos

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9. Support Staff 10 Posted by Ondina D.F. on 16 May, 2012 09:51 AM

   

   Cool! Have fun with signals :)
   I'm going to mark this issue as resolved. You can reopen the discussion at any time, if need be.
   Ondina

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10. Ondina D.F. closed this discussion on 16 May, 2012 09:51 AM.

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