在Flex中，使用VBox堆叠组件时如何获取坐标? [英] In flex, how to get coordinates when using VBox for stacking up components?

问题描述

在flex中，我正在使用VBox& HBox用来堆叠组件.当我尝试获取组件的x，y坐标时，我总是得到0.如果我像mx:VBox x ="120"这样指定坐标，那么我会得到值.

In flex, I am using VBox & HBox to stack components. When I try to get x,y coordinate of a component, I always get 0. If I specify coordinate like mx:VBox x="120", then I get the value.

如何在没有明确说明的情况下获取坐标.

How can I get the coordinate without explicitly stating it.

推荐答案

您可以相对于舞台平移坐标.查看下面的代码:

You can translate the coordinates relatively to the stage. Check out the code below:

var box:VBox = new VBox;
var child:DisplayObject = new DisplayObject;

box.addChild(child);

child.addEventListener(FlexEvent.UPDATE_COMPLETE, updateCompleteHandler);

...

private function updateCompleteHandler(fe:FlexEvent):void{
  // find global coordinates
  var globalCoords:Point = child.localToGlobal(new Point(0,0));

  // coordsInBox is what you are looking for
  var coordsInBox:Point = box.globalToLocal(globalCoords); 
}

关键是要使用localToGlobal作为子组件，然后使用globalToLocal转换全局坐标，以便相对于Box容器表达它们.

The point is to use localToGlobal for the child components and then globalToLocal to translate the global coordinates so that they were expressed relatively to the box container.

请注意，在子对象调用UPDATE_COMPLETE之前，不会处理坐标.

Please notice, that the coordinates won't be processed until UPDATE_COMPLETE is called by the child object.

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