AS3中限制显示对象的拖动坐标
如何根据创建对象的类中的父对象或舞台引用显示对象的坐标？
本质上，当我从自定义类创建新的精灵对象并将其添加到显示列表时，我想在自定义类中包含代码，以将拖动坐标限制到舞台或舞台的一部分。
//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();
}
}
}
how can i reference a display object's coordinates according to it's parent object or stage from within the class that creates the object?
essentially when i create a new sprite object from a custom class and add it to the display list, i'd like to include code within the custom class that limits the drag coordinates to the stage, or a section of the stage.
//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();
}
}
}
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评论（1）
对于您想做的事情有一些本机支持。
startDrag()接受一个矩形作为参数，该参数限制可以发生拖动的区域。希望有帮助，
泰勒。
There is some native support for what you want to do.
startDrag()accepts a rectangle as a parameter which restricts the region in which the drag can take place.Hope that helps,
Tyler.