<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
                       xmlns:s="library://ns.adobe.com/flex/spark" 
                       xmlns:mx="library://ns.adobe.com/flex/mx" width="170" height="218" initialize="init()">
    
    <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.events.ResizeEvent;
            
            import spark.components.Button;
            
            private var label:String = "789/456*123-0C=+";
            private var maxChat:int = 20;
            [Bindable]
            private var _numA:Number;
            [Bindable]
            private var _numB:Number;
            private var _sign:int;
            
            private function init():void
            {
                
                display.editable = false;
                display.setStyle("direction","rtl");
                
                this.addEventListener(KeyboardEvent.KEY_DOWN,keyDown);
                
                for(var i:int=0;i<label.length;i++){
                    var b:Button = new Button();
                    b.label = label.charAt(i);
                    b.width=40;
                    b.height=40;
                    b.addEventListener(MouseEvent.CLICK,input);
                    tg.addElement(b);
                }
            }
            
            private function input(e:MouseEvent):void
            {
                if(isNaN(e.target.label)){
                    control(e.target.label);
                }else{
                    if(display.text.length < maxChat)
                        display.text=="0"?display.text = e.target.label:display.text += e.target.label;
                }
            }
            
            private function control(input:String):void
            {
                if(display.text == "0")
                    return;
                
                if(!_numA)
                    _numA = Number(display.text);
                else
                    _numB = Number(display.text);
                
                switch(input){
                    case "C":
                        break;
                    case "+":
                        break;
                    case "-":
                        break;
                    case "*":
                        break;
                    case "/":
                        break;
                    case "=":
                        break;
                }
                
            }
            
            private function keyDown(e:KeyboardEvent):void
            {
                //捕捉键盘按钮 
            }
            
            

        ]]>
    </fx:Script>

    
    <fx:Declarations>
        
    </fx:Declarations>
    
    <s:TextArea text="0" id="display" x="1" y="1" height="25" width="99%"  />
    <s:TileGroup id="tg" x="1" y="27" horizontalGap="2" verticalGap="2" requestedColumnCount="4"  />
    
</s:WindowedApplication>