AS3 RadioButton ---- 单选框控件

package
{
	import controlsEvents.RadioButtonEvent;
	
	import flash.display.Shape;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.filters.GlowFilter;

	/**
	 * 单选按钮
	 * @author Jave.Lin
	 */
	public class RadioButton extends Sprite
	{
		private var _tf:Label;
		private var _circle:Shape;
		private var _checked:Boolean=false;
		private var _isDowned:Boolean=false;
		
		public function get text():String
		{
			return _tf.text;
		}
		
		public function set text(value:String):void
		{
			if(_tf.text!=value)
			{
				_tf.text=value;
				_tf.y=-5/2;
			}
		}
		
		public function get checked():Boolean
		{
			return _checked;
		}
		
		public function set checked(value:Boolean):void
		{
			if(_checked!=value)
			{
				_checked=value;
				redraw();
				dispatchEvent(new RadioButtonEvent(RadioButtonEvent.ON_CHECKED_CHANGED));
			}
		}
		
		public function RadioButton()
		{
			super();
			initialize();
		}
		
		private function initialize():void
		{
			_tf=new Label();
			_tf.x=10;
			addChild(_tf);
			
			_circle=new Shape();
			addChild(_circle);
			
			if(stage)
			{
				onAddedToStageHandler();
			}
			else
			{
				addEventListener(Event.ADDED_TO_STAGE,onAddedToStageHandler);
			}
			
			redraw();
		}
		
		private function onAddedToStageHandler(e:Event=null):void
		{
			removeEventListener(Event.ADDED_TO_STAGE,onAddedToStageHandler);
			
			addEventListener(Event.REMOVED_FROM_STAGE,onRemovedFromStageHandler);
			
			addEventListener(MouseEvent.MOUSE_OVER,onMouseOverHandler);
			addEventListener(MouseEvent.MOUSE_OUT,onMouseOutHandler);
			addEventListener(MouseEvent.MOUSE_DOWN,onMouseDownHandler);
			addEventListener(MouseEvent.MOUSE_UP,onMouseUpHandler);
			addEventListener(MouseEvent.CLICK,onClickHandler);
		}
		
		private function onClickHandler(e:MouseEvent):void
		{
			checked=!checked;
		}
		
		private function onMouseUpHandler(e:MouseEvent=null):void
		{
			if(_isDowned)
			{
				_isDowned=false;
				this.x-=1;
				this.y-=1;
			}
		}
		
		private function onMouseDownHandler(e:MouseEvent):void
		{
			if(!_isDowned)
			{
				_isDowned=true;
				this.x+=1;
				this.y+=1;
			}
		}
		
		private function onMouseOutHandler(e:MouseEvent):void
		{
			removeEventListener(MouseEvent.MOUSE_OUT,onMouseOutHandler);
			addEventListener(MouseEvent.MOUSE_OVER,onMouseOverHandler);
			
			onMouseUpHandler();
			
			_circle.filters=null;
		}

		private function onMouseOverHandler(e:MouseEvent):void
		{
			removeEventListener(MouseEvent.MOUSE_OVER,onMouseOverHandler);
			addEventListener(MouseEvent.MOUSE_OUT,onMouseOutHandler);
			
			_circle.filters=[new GlowFilter(0x00ff00,1,3,3,3)];
		}
		
		private function onRemovedFromStageHandler(e:Event):void
		{
			removeEventListener(Event.REMOVED_FROM_STAGE,onRemovedFromStageHandler);
			removeEventListener(MouseEvent.MOUSE_OVER,onMouseOverHandler);
			removeEventListener(MouseEvent.MOUSE_OUT,onMouseOutHandler);
			removeEventListener(MouseEvent.MOUSE_DOWN,onMouseDownHandler);
			removeEventListener(MouseEvent.MOUSE_UP,onMouseUpHandler);
			removeEventListener(MouseEvent.CLICK,onClickHandler);
		}
		
		private function redraw():void
		{
			_circle.graphics.clear();
			
			_circle.graphics.lineStyle(1);
			_circle.graphics.moveTo(5+5,0+5);
			
			var perAngle:Number=(Math.PI*2)/180;
			for (var i:int = 0; i < 180; i++) 
			{
				_circle.graphics.lineTo(Math.cos(i*perAngle)*5+5,Math.sin(i*perAngle)*5+5); 
			}
			
//			_circle.graphics.lineTo(5,0);
			
			if(_checked)
			{
				_circle.graphics.beginFill(0x00ff00,0.5);
				_circle.graphics.drawCircle(5,5,4);
				_circle.graphics.endFill();
			}
		}
	}
}

运行效果：

package
{
	import controlsEvents.RadioButtonEvent;
	
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	
	public class ControlsTest extends Sprite
	{
		private var rbt:RadioButton;
		public function ControlsTest()
		{
			rbt=new RadioButton();
			rbt.text="test";
			rbt.x=100;
			rbt.y=100;
			
			addChild(rbt);
			
			rbt.addEventListener(RadioButtonEvent.ON_CHECKED_CHANGED,onCheckedChangedHandler);
		}
		
		private function onCheckedChangedHandler(e:RadioButtonEvent):void
		{
			trace(rbt.checked);
		}
	}
}

补上：事件类：

package controlsEvents
{
	import flash.events.Event;
	
	public class RadioButtonEvent extends Event
	{
		public static const ON_CHECKED_CHANGED:String="ON_CHECKED_CHANGED";
		
		public function RadioButtonEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
		{
			super(type, bubbles, cancelable);
		}
	}
}

图片：