flex中的定时器Timer
发布时间：2020-12-15 05:12:15 所属栏目：百科 来源：网络整理
导读：flash.util.Timer类 ? ??? flash.util.Timer类允许通过添加时间事件或延时来调用方法。通过Timer构造器创建实例对象，传递一个毫秒数字作为构造参数作为间隔时间，下面的例子实例化一个Timer对象每个1秒钟发出事件信号：? ??? var ?timer.Timer? = ? new ?Ti
|
flash.util.Timer类?
var
?timer.Timer?
=
?
new
?Timer(
1000
);?
? ??? 一旦创建了Timer实例，下一步必须添加一个事件监听器来处理发出的事件，Timer对象发出一个falsh.event.TimerEvent事件，它是根据设置的间隔时间或延时时间定时发出。下面的代码定义了一个事件监听，调用onTimer()方法作为处理函数：?
timer.addEventListener(TimerEvent.TIMER,?onTimer);?
???? function ?onTimer(event:TimerEvent): void {? ?????????trace( " on?timer " );? ????}? ?
?timer.start();?
?
?
var
?timer:Timer?
=
?
new
?Timer(
1000
,?
5
);?
? new
?Timer(
5000
,?
1
);?
timer.addEventListener(TimerEvent.TIMER,?deferredMethod);? timer.start();? ? ?
<?
xml?version
=
"
1.0
"
?encoding
=
"
utf-8
"
?>
????
< mx:Application?xmlns:mx = " http://www.adobe.com/2006/mxml " ???? ????????layout = " vertical " ???? ????????verticalAlign = " middle " ???? ????????backgroundColor = " white " ???? ????????creationComplete = " init() " ?viewSourceURL = " srcview/index.html " > ???? ?? ???? < mx:Script > ???? ???????? <! [CDATA[???? ????????????import?flash.utils.Timer;???? ????????????import?flash.events.TimerEvent;???? ?? ????????????private?const?MIN_MASK:String? = ? " 00 " ;???? ????????????private?const?SEC_MASK:String? = ? " 00 " ;???? ????????????private?const?MS_MASK:String? = ? " 000 " ;???? ????????????private?const?TIMER_INTERVAL: int ? = ? 10 ;???? ?? ????????????private? var ?baseTimer: int ;???? ?? ????????????private? var ?t:Timer;???? ?? ????????????private? function ?init(): void ?{???? ????????????????t? = ? new ?Timer(TIMER_INTERVAL);???? ????????????????t.addEventListener(TimerEvent.TIMER,?updateTimer);???? ????????????}???? ?? ????????????private? function ?updateTimer(evt:TimerEvent): void ?{???? ???????????????? var ?d:Date? = ? new ?Date(getTimer()? - ?baseTimer);???? ???????????????? var ?min:String? = ?(MIN_MASK? + ?d.minutes).substr( - MIN_MASK.length);???? ???????????????? var ?sec:String? = ?(SEC_MASK? + ?d.seconds).substr( - SEC_MASK.length);???? ???????????????? var ?ms:String? = ?(MS_MASK? + ?d.milliseconds).substr( - MS_MASK.length);???? ????????????????counter.text? = ?String(min? + ? " : " ? + ?sec? + ? " . " ? + ?ms);???? ????????????}???? ?? ????????????private? function ?startTimer(): void ?{???? ????????????????baseTimer? = ?getTimer();???? ????????????????t.start();???? ????????????}???? ?? ????????????private? function ?stopTimer(): void ?{???? ????????????????t.stop();???? ????????????}???? ????????]] > ???? ???? < / mx:Script>???? ?? ???? < mx:ApplicationControlBar?dock = " true " > ???? ???????? < mx:Button?label = " Start?timer " ?click = " startTimer() " ? / >???? ???????? < mx:Button?label = " Stop?timer " ?click = " stopTimer() " ? / >???? ???? < / mx:ApplicationControlBar>??????? ?? ???? < mx:Label?id = " counter " ?fontSize = " 96 " ? / >???? ?? < / mx:Application>??? ? ? 效果图：
Flex中Timer用法一例：上传文件（用时）计时器 ?
<?
xml?version
=
"
1.0
"
?encoding
=
"
utf-8
"
?>
?
< mx:Application?xmlns:mx = " http://www.adobe.com/2006/mxml " ? ????????layout = " vertical " ? ????????verticalAlign = " middle " ? ????????backgroundColor = " white " ? ????????creationComplete = " init(); " > ? ?? ???? < mx:Script > ? ???????? <! [CDATA[? ????????????import?flash.net.FileReference;? ????????????import?flash.net.URLRequestMethod;? ????????????import?mx.controls.Alert;? ????????????import?mx.utils.StringUtil;? ?? ????????????private? var ?fileRef:FileReference;? ????????????private? var ?urlVars:URLVariables;? ????????????private? var ?urlReq:URLRequest;? ????????????private? var ?startTimer:Number;? ????????????private? var ?timer:Timer;? ?? ????????????private? void ?{? ????????????????fileRef? = ? new ?FileReference();? ????????????????fileRef.addEventListener(Event.SELECT,?fileRef_select);? ????????????????fileRef.addEventListener(Event.COMPLETE,?fileRef_complete);? ????????????????fileRef.addEventListener(IOErrorEvent.IO_ERROR,?fileRef_ioError);? ?? ????????????????urlVars? = ? new ?URLVariables();? ????????????????urlVars.userID? = ? 94103 ;? ????????????????urlVars.fpVersion? = ?flash.system.Capabilities.version;? ?? ????????????????urlReq? = ? new ?URLRequest();? ????????????????urlReq.method? = ?URLRequestMethod.POST;? ????????????????urlReq.data? = ?urlVars;? ????????????????urlReq.url? = ? " http://localhost:8300/fileref/uploader.aspx " ;? ?? ????????????????timer? = ? new ?Timer( 100 );? ????????????????timer.addEventListener(TimerEvent.TIMER,?onTimer);? ????????????}? ?? ????????????private? function ?onTimer(evt:TimerEvent): void ?{? ????????????????lbl.text? = ?String(getTimer()? - ?startTimer)? + ? " ?ms " ;? ????????????}? ?? ????????????private? function ?start(): void ?{? ????????????????fileRef.browse();? ????????????}? ?? ????????????private? function ?fileRef_select(evt:Event): void ?{? ????????????????fileRef.upload(urlReq);? ????????????????startTimer? = ?getTimer();? ????????????????timer.start();? ????????????}? ?? ????????????private? function ?fileRef_complete(evt:Event): void ?{? ????????????????Alert.show(evt.toString(),?evt.type);? ????????????????timer.stop();? ????????????}? ?? ????????????private? function ?fileRef_ioError(evt:IOErrorEvent): void ?{? ????????????????Alert.show(evt.text,?evt.type);? ????????????????timer.stop();? ????????????}? ????????]] > ? ???? < / mx:Script>? ?? ???? < mx:Button?label = " upload " ?click = " start(); " ? / >? ???? < mx:Label?id = " lbl " ? / >? ?? < / mx:Application> ? ? 效果图：
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