目前,我们的一个团队遇到了一个非常奇怪的现象：在操纵MovieClip的z属性并改变舞台质量之后,嵌套MovieClip的一些事件监听器似乎消失了(或者至少不再对正确的事件做出反应).
这个问题也只出现在同时进行,改变舞台质量和操纵zproperty时.
这是一个简单的类,演示了这个问题：
package {
import flash.display.StageScaleMode;
import flash.display.StageAlign;
import flash.display.Graphics;
import flash.display.MovieClip;
import flash.display.StageQuality;
import flash.events.MouseEvent;
public class StageQualityTestDemo extends MovieClip {
private static const OVER_COLOR:uint = 0x13ff37;
private static const OUT_COLOR:uint = 0x000000;
private static const BACK_COLOR:uint = 0xdeadc0de;
private var _qualitySetting:int = 0;
private var _zoom:Number = 0.0;
private var _mainsprite:MovieClip = new MovieClip();
private var _button:MovieClip = new MovieClip();
public function StageQualityTestDemo() {
initDemo();
}
private function initDemo():void {
this.addChild(_mainsprite);
_mainsprite.addChild(_button);
this.stage.addEventListener(MouseEvent.MOUSE_WHEEL,handleMouseWheel);
stage.quality = StageQuality.LOW;
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
drawButtonCircle(OUT_COLOR);
drawMainBackground(BACK_COLOR);
_button.addEventListener(MouseEvent.MOUSE_OVER,handleMouSEOver);
_button.addEventListener(MouseEvent.MOUSE_OUT,handleMouSEOut);
}
private function handleMouSEOver(event:MouseEvent):void {
drawButtonCircle(OVER_COLOR);
}
private function handleMouSEOut(event:MouseEvent):void {
drawButtonCircle(OUT_COLOR);
}
private function drawMainBackground(color:uint):void {
var g:Graphics = _mainsprite.graphics;
g.clear();
g.beginFill(color);
g.drawRect(0,500,500);
g.endFill();
}
private function drawButtonCircle(color:uint):void {
var g:Graphics = _button.graphics;
g.clear();
g.beginFill(color);
g.drawCircle(250,250,50);
g.endFill();
}
private function handleMouseWheel(event:MouseEvent):void {
var motion:Number = event.delta * 5;
_zoom += motion;
_mainsprite.z = _zoom;
if (_zoom < 0 && _qualitySetting != 0 ) {
_qualitySetting = 0;
trace("setting LOW");
stage.quality = StageQuality.LOW;
}
if (_zoom > 100 && _qualitySetting == 0 ) {
_qualitySetting = 1;
trace("setting HIGH");
stage.quality = StageQuality.HIGH;
}
}
}
}
任何人都可以给我一个指针在这里发生了什么？为什么_button上的eventlisteners在缩小时停止工作并且舞台质量为HIGH但在放大并且舞台质量低时再次工作？救命？任何人？
[更新]
基于@Amy Blankenship的建议,我添加了一些跟踪语句.结果是willTrigger()和hasEventListener()都报告为true,但仍未调用处理函数.
代码更改：
[...]
private var _counter:int;
[...]
private function initDemo():void {
this.addChild(_mainsprite);
_mainsprite.addChild(_button);
this.stage.addEventListener(MouseEvent.MOUSE_WHEEL,handleMouseWheel);
this.stage.addEventListener(MouseEvent.MOUSE_MOVE,handleMouseMove);
stage.quality = StageQuality.LOW;
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
drawButtonCircle(OUT_COLOR);
drawMainBackground(BACK_COLOR);
_button.addEventListener(MouseEvent.MOUSE_OVER,handleMouSEOver);
_button.addEventListener(MouseEvent.MOUSE_OUT,handleMouSEOut);
}
private function handleMouseMove(event:MouseEvent):void {
if (_counter++ % 50 == 0) {
trace("_button.willTrigger(MouseEvent.MOUSE_OVER): " + _button.willTrigger(MouseEvent.MOUSE_OVER));
trace("_button.willTrigger(MouseEvent.MOUSE_OUT): " + _button.willTrigger(MouseEvent.MOUSE_OVER));
trace("_button.hasEventListener(MouseEvent.MOUSE_OVER): " + _button.hasEventListener(MouseEvent.MOUSE_OVER));
trace("_button.hasEventListener(MouseEvent.MOUSE_OUT): " + _button.hasEventListener(MouseEvent.MOUSE_OUT));
}
}
private function handleMouSEOver(event:MouseEvent):void {
trace("handleMouSEOver");
drawButtonCircle(OVER_COLOR);
}
private function handleMouSEOut(event:MouseEvent):void {
trace("handleMouSEOut");
drawButtonCircle(OUT_COLOR);
}
[...]
跟踪输出：
_button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true // moving the mouse over and off _button handleMouSEOver handleMouSEOut _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true // zooming out; handler methods no longer called setting HIGH _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true // zooming back in; handler methods called again setting LOW handleMouSEOver handleMouSEOut _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true handleMouSEOver _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true handleMouSEOut _button.willTrigger(MouseEvent.MOUSE_OVER): true _button.willTrigger(MouseEvent.MOUSE_OUT): true _button.hasEventListener(MouseEvent.MOUSE_OVER): true _button.hasEventListener(MouseEvent.MOUSE_OUT): true handleMouSEOver handleMouSEOut
[/更新]