DragManager拖拉控制

本文主要是介绍DragManager拖拉控制，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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"?>
<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>