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One mediator for a Parent listening to many children

antoine.amassih

01 Dec, 2010 01:30 PM via web

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Hi i am very new at robotlegs,

Im trying to create a single mediator for a grid where each square in the grid is a different view and has independant events ( such as click ) attached to them.

there are of the order of 150 squares and it seems unreasonable to have a mediator for each one especially since only one signal can be fired at a time, so i am trying to create a parent grid and a mediator attached to that listening to signals for the children, i am trying not to do this using some central singleton which handles the signals and also i would like to leave it independant of the main context.

Thanks

1. 2 Posted by Abel de Beer on 01 Dec, 2010 03:35 PM

   

   It sounds very logical to create one view/mediator combination for the grid that contains all your 'square views'. Especially if they all fire the same types of events. For example, if all your squares dispatch a SquareEvent.CLICKED event, your grid view could listen for this event and dispatch a framework event (or signal of course) in response.

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2. 3 Posted by antoine.amassih on 01 Dec, 2010 03:52 PM

   

   so how would the Mediator listen for the child event since its mapped to the Parent View.

   mediatorMap.mapView(ParentView, ParentViewMediator);

   Again im new , is it through :

   addContextListener(SquareEvent.CLICKED , handleMessage)

   for example even though the child view is not mapped?

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3. 4 Posted by Abel de Beer on 01 Dec, 2010 05:37 PM

   

   Almost! You should do addViewListener(SquareEvent.CLICKED, square_onClicked);. The event.target property should reference the clicked square.

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4. 5 Posted by antoine.amassih on 01 Dec, 2010 05:45 PM

   

   Will try it out Thanks for the help, Cheers

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5. 6 Posted by antoine.amassih on 05 Dec, 2010 05:40 PM

   

   Abel,

   So i tried what you suggested :

   HexGrid View Contains HexBitmap View

   i dispatch an Event in the HexBitmap View :

   dispatchEvent(new HexEvent(HexEvent.HEX_CLICKED));

   Which works fine then i add this to the context:

   mediatorMap.mapView(HexGrid, HexGridMediator);

   and the mediator :

   `import org.robotlegs.demos.helloflash.controller.HexEvent;

   import org.robotlegs.mvcs.Mediator;
   
   public class HexGridMediator extends Mediator
   {
       [Inject]
       public var view:HexGrid;
   
       public function HexGridMediator()
       {
   
       }
   
       override public function onRegister():void
       {
           addContextListener(HexEvent.HEX_CLICKED, OnSomeHexClicked);
           //eventMap.mapListener(eventDispatcher, HexEvent.HEX_CLICKED, OnSomeHexClicked);
       }
   
       protected function OnSomeHexClicked(e:HexEvent):void
       {
           // Manipulate the view
           trace("This Event Was Received");
       }
   }`
   

   Which for some reason doesnt accept the addViewListener or addContextListener . and of course it doesnt work.

   Suggestions ?

   Thanks

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6. Support Staff 7 Posted by Shaun Smith on 05 Dec, 2010 05:46 PM

   

   Make sure your HexEvent bubbles.

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7. 8 Posted by antoine.amassih on 05 Dec, 2010 06:07 PM

   

   Hey Shaun,

   Thanks but it does isnt it just
   `public function HexEvent(type:String, body:* = null)

       {
           super(type,true,true);
           _body = body;
       }`
   

   it doesnt work, i forgot to mention that im using:

   eventMap.mapListener(eventDispatcher, HexEvent.HEX_CLICKED, OnSomeHexClicked);

   because its not recognizing addViewListener in the mediator.

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8. Support Staff 9 Posted by Shaun Smith on 05 Dec, 2010 06:11 PM

   

   Howdy. You need to override the clone method in your event or it won't bubble properly.

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9. 10 Posted by antoine.amassih on 05 Dec, 2010 06:14 PM

   

   This is the whole Event Class

   ` package org.robotlegs.demos.helloflash.controller
   {

   import flash.events.Event;
   
   public class HexEvent extends Event
   {
       public static const HEX_CLICKED:String = 'HEX_CLICKED';
   
       private var _body:*;
   
       public function HexEvent(type:String, body:* = null)
       {
           super(type,true,true);
           _body = body;
       }
   
       public function get body():*
       {
           return _body;
       }
   
       override public function clone():Event
       {
           return new HexEvent(type, body);
       }
   
   }
   

   }

   `

   its overriden

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10. Support Staff 11 Posted by Shaun Smith on 05 Dec, 2010 06:26 PM

    

    Hi. Looks like you're listening to the shared event dispatcher for those events, which doesn't make much sense: eventMap.mapListener(eventDispatcher, HexEvent.HEX_CLICKED, OnSomeHexClicked);

    Surely you want to be listening to the view?

    eventMap.mapListener(view, HexEvent.HEX_CLICKED, OnSomeHexClicked);

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11. 12 Posted by antoine.amassih on 05 Dec, 2010 06:28 PM

    

    Thanks a bunch for the quick responses, Works

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12. Support Staff 13 Posted by Shaun Smith on 05 Dec, 2010 06:31 PM

    

    It's a pleasure. Glad you're back on track

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13. Shaun Smith closed this discussion on 05 Dec, 2010 06:31 PM.

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