updateAfterEvent的用处

一般情况下没有API调用可以强制flash player进行渲染，除非，在mouse/keyboard/timer event里面调用event.updateAfterEvent(), 会强制flash player在event处理结束后做一次render.

FLASH：

（狂点击FLASH会触发updateAfterEvent的调用，强制刷新flash舞台）

测试代码:

package {

import flash.display.*;
import flash.events.*;
import flash.utils.*;

public class marshal3 extends MovieClip {
var a:Timer = new Timer(20,0);
public function marshal3() {
this.addEventListener(Event.ENTER_FRAME, enter_frame);

stage.addEventListener(MouseEvent.CLICK, onClick);
a.addEventListener(TimerEvent.TIMER, onTick);
a.start();
}

private function enter_frame(e:*){
trace("enter_frame," + getTimer());
}

public function onClick(e:*) {
trace("onClick," + getTimer());
e.updateAfterEvent();
}
public function onTick(e:*) {
trace("onTick" + getTimer());
mc1.x += 2;
if (mc1.x > 300) {
mc1.x = 2;
}
}
}

fps=1

输出：

enter_frame,2008

onTick2008

onTick2109

onTick2209

onTick2309

onTick2409

onTick2508

onTick2609

onTick2709

onTick2809

onTick2909

enter_frame,3008

onTick3008

onTick3109

onTick3209

onClick,3210

onTick3309

onClick,3385

onTick3409

onTick3508

onClick,3570

onTick3609

onTick3709

onClick,3729

onTick3809

onClick,3898

onTick3909

enter_frame,4008

onTick4008

onClick,4066

结论：

event.updateAfterEvent(), 会强制flash player在event处理结束后做一次render.

但是，并不会提早结束当前帧。FPS继续保持。