Detect Mouse leave stage while dragging in Actionscript 3

Question

Event.MOUSE_LEAVE is great in Actionscript 3, but it doesn\'t seem to fire if the user is holding their left (or right for that matter) mouse button down.

Is there a

Answer 1

here's what I do:

mc.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);

private function onMouseDown(_e:MouseEvent):void
{
    mc2.startDrag(params);

    stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
    stage.addEventListener(Event.MOUSE_LEAVE, onMouseLeave);
    stage.addEventListener(MouseEvent.MOUSE_OUT, onMouseOut);
}

private function onMouseUp(_e:MouseEvent):void
{
    ms2.stopDrag();
}

private function onMouseLeave(_e:Event):void
{
    mc2.stopDrag();
}

private function onMouseOut(_e:MouseEvent):void
{
    if (e.stageX <= 0 || e.stageX >= stage.stageWidth || e.stageY <= 0 || e.stageY >= stage.stageHeight)
    {
        mc2.stopDrag();
    }
}

Answer 2

Here is the right answer. Custom class you pass a DisplayObject to and will drag it till mouse-up or mouse out-of-stage. Customize at will:

package fanlib.gfx
{
    import flash.display.DisplayObject;
    import flash.display.Stage;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.geom.Point;
    import flash.ui.Mouse;

    public class Drag
    {
        private var obj:DisplayObject;
        private var point:Point = new Point();
        private var stg:Stage;

        public function Drag(obj:DisplayObject)
        {
            this.obj = obj;
            stg = Stg.Get();
            stg.addEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
            stg.addEventListener(MouseEvent.MOUSE_UP, stopDrag);
            //stg.addEventListener(Event.MOUSE_LEAVE, stopDrag); // sh*t just won't fire
            point.setTo(stg.mouseX, stg.mouseY);
        }

        private function mouseMove(e:MouseEvent):void {
            if (stg.mouseX <= 0 ||
                stg.mouseY <= 0 ||
                stg.mouseX >= stg.stageWidth ||
                stg.mouseY >= stg.stageHeight) {
                stopDrag();
                return;
            }
            obj.x += stg.mouseX - point.x;
            obj.y += stg.mouseY - point.y;
            point.setTo(stg.mouseX, stg.mouseY);
        }

        public function stopDrag(e:* = null):void {
            stg.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
            stg.removeEventListener(MouseEvent.MOUSE_UP, stopDrag);
            //stg.removeEventListener(Event.MOUSE_LEAVE, stopDrag);
        }
    }

}