AS3 How to set boundries to Mouse Down drag?

I'm new to AS3 and I have a square(1200w) that's bigger than the stage(200w). Right now you can keep dragging it left and right as far as you possibly can. How can I set a limit/boundry to how much of the square you can drag? So that it can't be dragged beyond it's maximum width?

Here's an image

this.addEventListener(MouseEvent.MOUSE_DO开发者_开发知识库WN, 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);
}

Please note I do not want to use the startdrag() method.

Based on your image, assume that mc refers to the blue box.

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;
}

Hopefully this is what you were after.