如何根据创建对象的类内的父对象或舞台来引用显示对象的坐标?限制显示对象在AS3中的拖动坐标
本质上,当我从一个自定义类创建一个新的精灵对象并将其添加到显示列表中时,我想在自定义类中包含限制拖动坐标到舞台或舞台的一部分的代码。
//Frame Script
import Swatch;
var test:Sprite = new Swatch();
addChild(test);
___________________
//Custom Class
package
{
import flash.display.Sprite;
import flash.events.MouseEvent;
public class Swatch extends Sprite
{
public function Swatch()
{
init();
}
private function init():void
{
var swatchObject:Sprite = new Sprite();
swatchObject.graphics.beginFill(0x0000FF, 1);
swatchObject.graphics.drawRect(100, 100, 150, 150);
swatchObject.graphics.endFill();
swatchObject.addEventListener(MouseEvent.MOUSE_DOWN, onDrag, false, 0, true);
swatchObject.addEventListener(MouseEvent.MOUSE_UP, onDrop, false, 0, true);
this.addChild(swatchObject);
}
private function onDrag(evt:MouseEvent):void
{
evt.target.startDrag();
//how to limit it's dragability to the Stage?
}
private function onDrop(evt:MouseEvent):void
{
evt.target.stopDrag();
}
}
}
不要忘记听Event.MOUSE_LEAVE事件(附加'onDrop'),以防用户点击对象并让我们离开舞台(虽然也许这是内置于'startDrag ()'功能已经?)。参考:http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/display/Stage.html#event:mouseLeave – Cameron 2010-04-07 16:18:54