仿照HTML跑马灯(Marquee)

模仿HTML跑马灯(Marquee)
模仿HTML的Marquee组件，组件容器为Group，和flex4中Group使用无区别。
组件代码：

package pizazz.flex4.component{
	import flash.events.MouseEvent;
	import flash.events.TimerEvent;
	import flash.ui.Mouse;
	import flash.utils.Timer;
	import mx.events.EffectEvent;
	import mx.events.FlexEvent;
	import pizazz.flex4.component.skin.marquee.MarqueeSkin;
	import spark.components.SkinnableContainer;
	import spark.effects.Move;
	import spark.effects.easing.Linear;
	import spark.layouts.HorizontalLayout;
	import spark.layouts.VerticalLayout;
	import spark.skins.spark.SkinnableContainerSkin;

	public class Marquee extends SkinnableContainer{
		public static const LEFT:String = "left";
		public static const RIGHT:String = "right";
		public static const UP:String = "up";
		public static const DOWN:String = "down";

		private var _moving:Move;
		private var _direction:String = RIGHT;
		private var _scrolldelay:Number = 0;
		private var _scrollamount:Number = 0;
		private var _loop:Number = 0;
		private var _autoStart:Boolean = true;
		private var _times:Timer;
		private var _running:Boolean = false;
		private var _isPause:Boolean = true;
		/**
		 * 滚动方向设置，可选择left、right、up和down
		 */
		[Inspectable(enumeration="left,right,up,down")]
		public function set direction(value:String):void{
			_direction = value;
		}
		/**
		 * 每轮滚动之间的延迟时间，越大越慢
		 */ 
		public function set scrolldelay(value:Number):void{
			_scrolldelay = value;
		}
		/**
		 * 一次滚动总的时间量，数字越小滚动越慢
		 */ 
		public function set scrollamount(value:Number):void{
			_scrollamount = value;
		}
		/**
		 * 滚动次数
		 */ 
		public function set loop(value:Number):void{
			_loop = value;
		}
		/**
		 * 是否自动开始move
		 */ 
		public function set autoStart(value:Boolean):void{
			_autoStart = value;
		}
		/**
		 * 鼠标滑过是否暂停
		 */
		public function set isPause(value:Boolean):void{
			_isPause = value;
		}

		public function Marquee(){
			super();
			setStyle("skinClass", MarqueeSkin);
			addEventListener(FlexEvent.CREATION_COMPLETE,
				function(event:FlexEvent):void{
					if(_autoStart){
						_times.start();
						_running = true;
					}
				}
			);
		}

		public function start():void{
			if(!_running){
				_times.start();
				_running = true;
			}
		}

		override protected function createChildren():void{
			super.createChildren();
			_moving = new Move(contentGroup);
			_moving.duration = _scrollamount;
			_moving.easer = new Linear();
			_moving.addEventListener(EffectEvent.EFFECT_END,
				function(event:EffectEvent):void{
					_times.start();
				}
			);
			_times = new Timer(_scrolldelay, _loop);
			_times.addEventListener(TimerEvent.TIMER,
				function(event:TimerEvent):void{
					_times.stop();
					play();
				}
			);
		}

		override protected function partAdded(partName:String, 
				instance:Object):void{
			super.partAdded(partName, instance);
			if(instance == contentGroup){
				if(_direction == RIGHT || _direction == LEFT){
					var _horizontal:HorizontalLayout = new HorizontalLayout();
					_horizontal.clipAndEnableScrolling = true;
					contentGroup.layout = _horizontal;
				}else if(_direction == UP || _direction == DOWN){
					var _vertical:VerticalLayout = new VerticalLayout();
					_vertical.clipAndEnableScrolling = true;
					contentGroup.layout = _vertical;
				}
				if(_isPause){
					contentGroup.addEventListener(MouseEvent.ROLL_OVER,
						function(event:MouseEvent):void{
							_moving.pause();
						}
					);
					contentGroup.addEventListener(MouseEvent.ROLL_OUT,
						function(event:MouseEvent):void{
							_moving.resume();
						}
					);
				}
			}
		}

		private function play():void{
			if(_direction == RIGHT){
				_moving.xFrom = -(contentGroup.width + 10);
				_moving.xBy = width + 10;
			}else if(_direction == LEFT){
				_moving.xFrom = width + 10;
				_moving.xBy = -(width + contentGroup.width + 10);
			}else if(_direction == UP){
				_moving.yFrom = height + 10;
				_moving.yBy = -(height + contentGroup.height + 10);
			}else if(_direction == DOWN){
				_moving.yFrom = -(contentGroup.height + 10);
				_moving.yBy = height + contentGroup.width + 10;
			}
			_moving.play();
		}
	}
}

pizazz.flex4.component.skin.marquee.MarqueeSkin.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:Skin xmlns:fx="http://ns.adobe.com/mxml/2009" 
		xmlns:s="library://ns.adobe.com/flex/spark" 
    	xmlns:fb="http://ns.adobe.com/flashbuilder/2009" 
		xmlns:layout="flexlib.scheduling.scheduleClasses.layout.*"
		alpha.disabled="0.5" >
    <fx:Metadata>
		<![CDATA[
			[HostComponent("pizazz.flex4.component.Marquee")]
		]]>
	</fx:Metadata>
    <fx:Script fb:purpose="styling">
        <![CDATA[         
            override protected function updateDisplayList(
					unscaledWidth:Number, unscaledHeight:Number):void{
                // Push backgroundColor and backgroundAlpha directly.
                // Handle undefined backgroundColor by hiding the background object.
                if (isNaN(getStyle("backgroundColor"))){
                    background.visible = false;
                }else{
                    background.visible = true;
                    bgFill.color = getStyle("backgroundColor");
                    bgFill.alpha = getStyle("backgroundAlpha");
                }
                super.updateDisplayList(unscaledWidth, unscaledHeight);
            }
        ]]>        
    </fx:Script>
    <s:states>
        <s:State name="normal" />
        <s:State name="disabled" />
    </s:states>
	<s:layout>
		<s:BasicLayout clipAndEnableScrolling="true" />
	</s:layout>
    <s:Rect id="background" left="0" right="0" top="0" bottom="0">
        <s:fill>
            <s:SolidColor id="bgFill" color="#FFFFFF"/>
        </s:fill>
    </s:Rect>
    <s:Group id="contentGroup" minWidth="0" minHeight="0" />
</s:Skin>

组件执行：

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx"
			   xmlns:component="pizazz.flex4.component.*"
			   minWidth="955" minHeight="600">
	<s:layout>
		<s:VerticalLayout />
	</s:layout>
	<fx:Script>
		<![CDATA[
			private function play():void{
				marquee.start();
			}
		]]>
	</fx:Script>
	<component:Marquee scrollamount="10000" direction="right" width="100%" 
			backgroundColor="0xFFFF00">
		<s:Label text="文字" height="100%" verticalAlign="middle" />
		<mx:LinkButton label="可点击文字" />
	</component:Marquee>
	<component:Marquee id="marquee" direction="up" autoStart="false" 
			isPause="false" scrollamount="12000" width="320" height="320" 
			backgroundColor="0xFFFF00">
		<mx:HBox width="320" horizontalAlign="center">
			<mx:Image source="pizazz/flex4/assets/image/pic_help.png" 
				width="40" height="40" />
			<s:Label width="100" text="这是一张图片的样式" />
		</mx:HBox>
		<s:Label width="100%" textAlign="center" text="--------------------" />
		<s:Button width="100" label="按钮" />
	</component:Marquee>
	<s:Button width="100" label="开始" click="play()" />
</s:Application>

视图：