flash - 为什么 EventListeners 在操作 z-property 和更改 stage.quality 后停止工作？

Question

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 属性并更改嵌套 的一些事件监听器的舞台质量之后MovieClips 似乎消失了(或者至少不再对适当的事件使用react)。

问题也仅在执行这两项操作时出现，即更改舞台质量和操纵z属性。

这是一个演示问题的简单类:

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, 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;
        }
    }
}
}

谁能告诉我这里到底发生了什么？为什么 _button 上的事件监听器在缩小且舞台质量为 HIGH 时停止工作，但在放大且舞台质量为 LOW 时再次工作？帮助？有人吗？

---

[更新]

根据@Amy Blankenship 的建议，我添加了更多的 trace 语句。结果是 willTrigger() 和 hasEventListener() 都报告为真，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]

Answer 1

我发现使用 stage.quality = StageQuality.MEDIUM;而不是 HIGH 作品。我知道 flash z 转换实际上是通过将剪辑转换为位图来工作的。并且该位图不是 InteractiveObjects。我认为您发现了 Flash Player 错误。但希望对缩放项目使用中级质量将使您获得“足够好”的质量来完成您的项目。