讨厌的DragManager

最新推荐文章于 2022-02-25 20:00:37 发布

geniicheng222

最新推荐文章于 2022-02-25 20:00:37 发布

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分类专栏： Flex 文章标签： Flex C C++ C# UP

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本文探讨了在Flex框架下解决拖拽事件被阻止的问题。通过使用MouseMove替代DragManager进行元素拖动，实现了容器内对象的正常交互。

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讨厌的DragManager

在一个容器上覆盖了层，透明png，然后容器里面就接受不到drag的任何事件了。翻看flex框架代码发现是在DragProxy里面做的判断，还是没有对drag忽略的代码。

没辙了，只好用MouseMove来做了：

<?xml version="1.0"?>
<!-- Simple example to demonstrate the ComboBox control. -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:local="*" 
    applicationComplete="applicationCompleteHandler()">
    <mx:Canvas id="ppp" width="440" height="267"  backgroundColor="#FFFFFF"
        blendMode="{BlendMode.LAYER}">
      <mx:Image  source="Creek.jpg" 
        maintainAspectRatio="false"
         mouseEnabled="false" mouseChildren="false" width="100%" height="100%"/>
     <mx:Canvas id="c" width="80%" height="80%"
         horizontalCenter="0" verticalCenter="0" borderStyle="solid" borderThickness="20" 
         borderColor="#33003E" backgroundColor="#E8E8E8"/>
     <local:DragIgnoreImage
         mouseEnabled="false" mouseChildren="false" width="100%" height="100%"/>     
    </mx:Canvas>
    <mx:Image id="p" width="100" height="100" source="Desert Landscape.jpg" mouseDown="imageMouseDownHandler(event)"/>
        <mx:List dragEnabled="true"> 
        <mx:dataProvider>
            <mx:String>AK</mx:String>
            <mx:String>AL</mx:String>
            <mx:String>AR</mx:String>
        </mx:dataProvider>
    </mx:List>
    <mx:Script>
        <![CDATA[
            import mx.core.IFlexDisplayObject;
            import mx.core.DragSource;
            import mx.core.UIComponent;
            import mx.events.DragEvent;
            import mx.managers.DragManager;
            private function applicationCompleteHandler():void {
                stage.addEventListener(MouseEvent.MOUSE_DOWN,stageMousedownhandler);
            }
            
            private function stageMousedownhandler(e:MouseEvent):void {
                stage.addEventListener(MouseEvent.MOUSE_MOVE,stageMouseMovehandler);
                stage.addEventListener(MouseEvent.MOUSE_UP,stageMouseUpHandler);
            }
            
            private function stageMouseMovehandler(e:MouseEvent):void {
                var p:Point = new Point(e.stageX,e.stageY);
                p = c.globalToLocal(p);
                
                if(DragManager.isDragging) {
                    if(c.getBounds(c).containsPoint(p)) {
                        c.setStyle("backgroundColor",0xFFFFF000);
                    }
                    else {
                         c.setStyle("backgroundColor",0xFF00F000);
                    }
                }
            }
            
            private function stageMouseUpHandler(e:MouseEvent):void {
                stage.removeEventListener(MouseEvent.MOUSE_MOVE,stageMouseMovehandler);
                stage.removeEventListener(MouseEvent.MOUSE_UP,stageMouseUpHandler);
            }
            
            private function imageMouseDownHandler(e:MouseEvent):void {
                var dragInitiator:Image=p;
                var ds:DragSource = new DragSource();
                ds.addData(dragInitiator, "img");               
                
                var d:Image = new Image();
                d.width = d.height = 100;
                d.source = p.source;
                DragManager.doDrag(dragInitiator, ds, e,d);
            }
        ]]>
    </mx:Script>
</mx:Application>