Question

我是AS3的新手，我有一个比舞台（200w）大的正方形（1200w）。现在你可以尽可能地左右拖动它。如何设置限制/边界可以拖动多少平方？那么它不能超出它的最大宽度？

this.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
this.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);

function mouseDownHandler(e:MouseEvent) {
    this.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
}

function mouseMoveHandler(e:MouseEvent) {
    square_mc.x = mouseX;
}

function mouseUpHandler(e:MouseEvent) {
    removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
}

请注意我不想使用startdrag()方法。

Answer 1

根据您的图片，假设mc指的是蓝色框。

var ox:Number = 0;

mc.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);

function mouseDownHandler(e:MouseEvent):void
{
    ox = mc.mouseX;

    stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
    stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
}

function mouseUpHandler(e:MouseEvent):void
{
    stage.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
}

function mouseMoveHandler(e:MouseEvent):void
{
    mc.x = mc.parent.mouseX - ox;

    if(mc.x > 0) mc.x = 0;
    if(mc.x + mc.width < stage.stageWidth) mc.x = stage.stageWidth - mc.width;
}

希望这就是你所追求的。

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