# Refencing and setting

**URL:** <https://forum.kirupa.com/t/refencing-and-setting/317997>\
**Category:** flash\
**Created:** [January 7, 2011, 5:32pm UTC](https://forum.kirupa.com/t/refencing-and-setting/317997 "2011-01-07T17:32:56Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![rimacy](https://avatars.discourse-cdn.com/v4/letter/r/839c29/32.png) [@rimacy](https://forum.kirupa.com/u/rimacy)\
**Post date:** [January 7, 2011, 5:32pm UTC](https://forum.kirupa.com/t/refencing-and-setting/317997/1 "2011-01-07T17:32:56Z")

</div>

Hey All  
I’m practicing MVC design pattern and it involves getting and setting which is where i think the problem may be here are the classes

MVCDocument

```auto
package
{
    import flash.display.Sprite;
    
    
    public class MVCDocument extends Sprite
    {
        public var _model:MVCModel;
        public var _controller:MVCController;
        public var _view:MVCView;
        
        
        public function MVCDocument():void
        {
            _model = new MVCModel();
            _controller = new MVCController(_model);
            _view = new MVCView(_model,_controller);
            addChild(_view);
        }
    }
}

```

[RIGHT]

[LEFT]MVCView

```auto
package 
{
    import flash.display.ShaderInput;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.KeyboardEvent;
    
    /**
     * ...
     *
     */
    public class MVCView extends Sprite
    {
        private var ship:Ship = new Ship;
        
        private var _model:Object;
        private var _controller:Object;
        
        public function MVCView(MVCModel:Object,MVCController:Object):void
        {
            _model = MVCModel;
            _model.addEventListener(Event.CHANGE, changeHandler);
            _controller = MVCController;
            addEventListener(Event.ADDED_TO_STAGE, addedToStage);
        }
        public function addedToStage(evt:Event):void
        {
            ship.x = 100;
            ship.y = 100;
            addChild(ship);
            
            stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
            removeEventListener(Event.ADDED_TO_STAGE,addedToStage)
        }
        public function onKeyDown(evt:KeyboardEvent):void
        {
            _controller.processKeyDownEvent(evt);
        }
        public function changeHandler(evt:Event):void
        {
            ship.rotation = _model._rotationValue;
        }
        
    }
    
}

```

MVCController

```auto

package 
{
    import flash.events.KeyboardEvent;
    import flash.ui.Keyboard;
    
    /**
     * ...
     * 
     */
    public class MVCController 
    {
        private var _model:Object
        
        public function MVCController(MVCModel:Object):void
        {
            _model = MVCModel;
        }
        public function processKeyDownEvent(evt:KeyboardEvent):void
        {
            switch(evt.keyCode)
            {
                case Keyboard.LEFT:
                _model._rotationSpeed -=5;
                trace("roationSetFrom Controller")
                break;
                case Keyboard.RIGHT:
                _model._rotationSpeed += 5;
                trace("roationSetFrom Controller")
                break;
            }
            
        }
    }
    
}

```

MVCModel

```auto
package 
{
    import flash.events.EventDispatcher;
    import flash.events.Event;
    
    /**
     * ...
     * 
     */
    public class MVCModel extends EventDispatcher
    {
        public var _rotationValue:Number;
        public var _rotationSpeed:Number;
        
        public function MVCModel()
        {
            _rotationValue=0;
            trace("rotationValue = " + _rotationValue);
            
        }
        public function update():void
        {
            trace("_rotationValue = "+ _rotationValue);
            //_rotationValue += _rotationSpeed;
             _rotationSpeed += _rotationValue;
            
        }
        public function get rotationValue():Number
        {
            return _rotationValue;
        }
        public function set rotationValue (value:Number)
        {
            _rotationValue = value;
            trace("rotVal Set");
            dispatchEvent(new Event(Event.CHANGE));
            
        }
        
        
        
    }
    
}

```

the last trace i get is the one in the switch statement in the keyboardeventHandler funtion in MVCController

so I’m at a loss:block:  
[/LEFT]  
[/RIGHT]