ActionScript3的。 如何將Embed MovieClip投射到MovieClip？

Question

我有帶有MovieClips的HintMenu.swf庫：

    public class PopupMenuItem extends MovieClip {

    [Embed(source="HintMenu.swf", symbol="ExternalMovie")]
    private var woodButtonClass:Class;

    public var activeItemSkin:MovieClip;

    public function PopupMenuItem(
        activeItemSkin = new woodButtonClass();
    )

但是開始時，我收到以下錯誤：

[Fault] exception, information=TypeError: Error #1034: Type Coercion failed:
cannot convert energy.ui.alts.component.popup::PopupMenuItem_woodButtonClass@a7c0e19 to
flash.display.MovieClip.

以后我需要將其用作MovieClip。 有什么辦法嗎？

Answer 1

as MovieClip 。

activeItemSkin = new woodButtonClass() as MovieClip;

您需要確保woodButtonClass實際上是一個MovieClip 。 如果不是，則activeItemSkin將為null。

Answer 2

實際上，您無法將具有1幀的Embed MovieClip投射到MovieClip。 優化的原因Flash IDE將其轉換為Sprite：

package {
    import flash.display.DisplayObjectContainer;
    import flash.display.MovieClip;
    import flash.display.Sprite;

    [SWF(backgroundColor="0x333333")]
    public class Test_MultipleSwfEmbed extends Sprite{
        [Embed(source="swf/HintMenu.swf", symbol="button1")]
        private var oneFrameMovieClip:Class;

        [Embed(source="swf/HintMenu.swf", symbol="button2")]
        private var twoFramesMovieClip:Class;

        public function Test_MultipleSwfEmbed() {

            //"is MovieClip" = true, when > 1 frame
            traceType(new oneFrameMovieClip()); // false, true, true
            traceType(new twoFramesMovieClip()); // true, true, true
        }

        private function traceType(mc:*):void {
            trace(mc is MovieClip, mc is Sprite, mc is DisplayObjectContainer);
        }
    }
}