一个简单的状态栏示例

Flex3未提供状态栏组件，于是自己写了一个简单的状态栏。这个状态栏显示的信息有以下三种：1)文本；2)等待信息；3)进度条。效果如下所示：


下面是我在项目中实际用到的状态栏，主要用于显示系统状态、等待信息、进度、当前用户以及用户登录时间。

<?xml version="1.0" encoding="utf-8"?>
<controls:IBSStatusBar xmlns:mx="http://www.adobe.com/2006/mxml" 
	xmlns:controls="com.ccac.ibs.controls.*" 
	width="100%" height="23" 
	styleName="mainStatusBar">
	
	<mx:Script>
		<![CDATA[
			import com.ccac.ibs.controls.IBSStatusPanelMode;
			
			import flash.events.TimerEvent;
			import flash.utils.Timer;
			
			import mx.events.FlexEvent;
			import mx.formatters.DateFormatter;
			import mx.utils.StringUtil;
			import mx.utils.UIDUtil;
			
			private const STATUSTEXT_TIMEOUT:Number = 3000;
			
			private var timer:Timer = null;
			
			private var defaultText:String = "";
			
			private var lastText:String = "";
			
			private var lastWaitText:String = "";
			
			[ArrayElementType("Object")]
			private var waitings:Array = [];
			
			override protected function createChildren():void
			{
				super.createChildren();
				timer = new Timer(1000, 1);
				timer.addEventListener(TimerEvent.TIMER_COMPLETE, timerCompleteHandler);
				panelConfig = [{percentWidth: 100}, 
						{width: 120}, 
						{width: 180}, 
						{width: 180, textAlign: "center"}];
				clearProgressBar();
			}
			
			public function showStatusText(text:String, timeout:Number = STATUSTEXT_TIMEOUT):void
			{
				if (text == null)
					text = "";
				if (isNaN(timeout))
					timeout = STATUSTEXT_TIMEOUT;
				if (timer)
					timer.stop();
				lastText = text;
				if (timeout <= 0)
				{
					defaultText = text;
				}
				else
				{
					timer.delay = timeout;
					timer.start();
				}
				if (panels(0))
				{
					if (panels(0).mode != IBSStatusPanelMode.TEXT)
						panels(0).mode = IBSStatusPanelMode.TEXT;
					panels(0).label = text;
				}
			}
			
			public function clearStatusText():void
			{
				if (panels(0) && panels(0).mode == IBSStatusPanelMode.TEXT)
				{
					panels(0).label = "";
					lastText = "";
					defaultText = "";
				}
			}
			
			public function showWaiting(text:String):String
			{
				var waitingId:String = UIDUtil.createUID();
				if (text == null)
					text = "";
				waitings.push({"id": waitingId, "text": text});
				lastWaitText = text;
				if (panels(0))
				{
					panels(0).label = text;
					if (panels(0).mode != IBSStatusPanelMode.WAITING)
						panels(0).mode = IBSStatusPanelMode.WAITING;
				}
				return waitingId;
			}
			
			public function clearWaiting(waitingId:String = null):void
			{
				var index:int = -1;
				if (waitingId == null)
					waitings = [];
				for (var i:int = 0; i < waitings.length; i++)
				{
					var waiting:Object = waitings[i];
					if (waiting.id == waitingId)
					{
						index = i;
						waitings.splice(index, 1);
						break;
					}
				}
				if (index == -1 && waitings.length > 0)
					return;
				if (panels(0))
				{
					if (waitings.length > 0)
					{
						if (panels(0).mode != IBSStatusPanelMode.WAITING)
							panels(0).mode = IBSStatusPanelMode.WAITING;
						lastWaitText = waitings[waitings.length - 1].text;
						panels(0).label = waitings[waitings.length - 1].text;
					}
					else
					{
						if (panels(0).mode != IBSStatusPanelMode.TEXT)
							panels(0).mode = IBSStatusPanelMode.TEXT;
						panels(0).label = lastText;
					}
				}
			}
			
			public function showProgressBar(marqueeMode:Boolean = false):void
			{
				if (panels(1))
				{
					panels(1).mode = IBSStatusPanelMode.PROGRESSBAR;
					panels(1).marqueeMode = marqueeMode;
					panels(1).progressValue = 0;
					panels(1).visible = true;
					panels(1).includeInLayout = true;
				}
			}
			
			public function setProgressValue(value:Number):void
			{
				if (panels(1))
					panels(1).progressValue = value;
			}
			
			public function setProgress(loaded:Number, total:Number):void
			{
				if (panels(1))
					panels(1).setProgress(loaded, total);
			}
			
			public function clearProgressBar():void
			{
				if (panels(1))
				{
					panels(1).visible = false;
					panels(1).includeInLayout = false;
					panels(1).mode = IBSStatusPanelMode.TEXT;
				}
			}
			
			public function showCurrentUser(userName:String):void
			{
				clearCurrentUser();
				if (panels(2))
					panels(2).label = "Current User: " + userName;
			}
			
			public function clearCurrentUser():void
			{
				if (panels(2))
					panels(2).label = "";
			}
			
			public function showLoginTime(time:Date):void
			{
				clearLoginTime();
				if (panels(3) && time)
				{
					var formatter:DateFormatter = new DateFormatter();
					formatter.formatString = "YYYY-MM-DD JJ:NN";
					panels(3).label = "Login Time: " + formatter.format(time);
				}
			}
			
			public function clearLoginTime():void
			{
				if (panels(3))
					panels(3).label = "";
			}
			
			private function timerCompleteHandler(event:TimerEvent):void
			{
				if (panels(0) && panels(0).mode == IBSStatusPanelMode.TEXT)
					panels(0).label = defaultText;
				lastText = defaultText;
			}
		]]>
	</mx:Script>
	
</controls:IBSStatusBar>

这里是源程序：
点击下载