Flex锁定页面遮罩【原创】

主要实现功能是锁定父页面，然后给出友好提示

效果图如下：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                layout="absolute"
                verticalScrollPolicy="off"
                horizontalScrollPolicy="off"
                xmlns:Masks="Masks.*">

    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            private function myClickFunction():void
            {
                new MyMasks(canvasTest);
            }
        ]]>
    </mx:Script>

    <mx:Button x="150"
               y="10"
               label="Button"
               click="myClickFunction();"/>

    <mx:Canvas id="canvasTest"
               backgroundColor="#110E0E"
               x="215"
               y="132"
               width="214"
               height="137">
        <mx:Button x="74"
                   y="53"
                   label="Button"
                   click="Alert.show('test');"/>
    </mx:Canvas>
</mx:Application>

package Masks
{
    import flash.display.DisplayObject;
    
    import mx.containers.Canvas;
    import mx.containers.HBox;
    import mx.controls.SWFLoader;
    import mx.controls.Text;

    public class MyMasks extends Canvas
    {
        public function MyMasks(obj:DisplayObject)
        {
            super();
            
            var canvas:Canvas=obj as Canvas;
            var arr:Array = canvas.getChildren();
    
            for(var i:int=0;i<arr.length;i++)
            {
                if(arr[i] is MyMasks)
                {
                    arr[i].visible = !arr[i].visible;
                    return;
                }
            }
            
            this.setStyle("backgroundColor", "#FFFFFF");
            this.setStyle("backgroundAlpha", 0);
            this.width=canvas.width;
            this.height=canvas.height;

            var hbox:HBox=new HBox();
            hbox.setStyle("width", "100%");

            var swfLoader:SWFLoader=new SWFLoader();
            swfLoader.source="../assets/loader.swf";
            swfLoader.autoLoad=true;

            var text:Text=new Text();
            text.setStyle("color", "#ffffff");
            text.text="正在加载...";

            hbox.addChild(swfLoader);
            hbox.addChild(text);
            this.addChild(hbox);
            this.id="mask";
            canvas.addChild(this);
        }
    }
}