Problems replicating drag-and-drop with mouse events

Question

I want to replicate the standard startDrag/stopDrag events with my own routine to alter things a bit, and I run into some kind of event propagation or bubbling problem. Her

Answer 1

Track which target you're concerned about and only listen to events directly from it. So in your mousemove function, check e.target == your object. In this case, the application. You will get stray events bubbling from sub components.

    public static function smoothDrag(pressEvent:MouseEvent, dragTarget:DisplayObject = null, done:Function=null, move:Function = null, parent:DisplayObject = null):void {
        var target:DisplayObject = dragTarget;
        parent = parent || target.parent;
        var eventParent:EventDispatcher = target.stage || parent;

        var moveFunc:Function = move;
        var doneFunc:Function = done;

        var startPoint:Point = MouseHelpers.pointTo(pressEvent.localX, pressEvent.localY, pressEvent.target as DisplayObject, parent);
        startPoint.x -= target.x
        startPoint.y -= target.y;

        var setPosition:Function = function(e:MouseEvent):void 
        {
            e.stopImmediatePropagation();
            var p:Point = MouseHelpers.pointTo(e.localX,e.localY, e.target as DisplayObject, parent);
            target.x = p.x - startPoint.x;
            target.y = p.y - startPoint.y;

            if (moveFunc != null) {
                moveFunc();
            }
        }

        var stopMove:Function = function(e:MouseEvent):void {
            e.stopImmediatePropagation();
            eventParent.removeEventListener(MouseEvent.MOUSE_MOVE, setPosition, true);
            eventParent.removeEventListener(MouseEvent.MOUSE_UP, stopMove, true);
            eventParent.removeEventListener(MouseEvent.ROLL_OVER, EventHelpers.stop, true);
            eventParent.removeEventListener(MouseEvent.MOUSE_OVER, EventHelpers.stop, true);

            if (doneFunc != null) {
                doneFunc(e);
            }
        }
        eventParent.addEventListener(MouseEvent.ROLL_OVER, EventHelpers.stop, true, 0, true);
        eventParent.addEventListener(MouseEvent.MOUSE_OVER, EventHelpers.stop, true, 0, true);
        eventParent.addEventListener(MouseEvent.MOUSE_MOVE, setPosition, true, 0, true);
        eventParent.addEventListener(MouseEvent.MOUSE_UP, stopMove, true, 0, true);
    }


    /**
     *  Translate a point from one object's reference into another. Best used when you have a descendant object x/y and you
     *  want to get that position relative to an ancestor. Uses the localToGlobal/globalToLocal style. 
     **/
    public static function pointTo(fromX:Number, fromY:Number, src:DisplayObject, dest:DisplayObject):Point {
        var p:Point = new Point(fromX, fromY);
        if(src != dest) {
            p = src.localToGlobal(p);
            p = dest.globalToLocal(p);
        }
        return p;
    }