[flexcoders] Puzzling Drag Drop Issues/Bug??

[jmfillman]

This is a little complicated to explain, so please bear with me. Run 
the example AIR app below, drag the button to see what happens, and 
then read on. 

I can't seem to calculate the place where the item was actually 
dropped in the Canvas?
I tried calculate the position in the dragDropHandler based on the 
canvas mouseY + verticalScrollPosition, but the mouseY position value 
oddly gets fixed to the mouse position where the drag started, not 
the current mouseY position.

Is this a bug?


<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"; 
layout="absolute" initialize="initApp();">
        <mx:Script>
                <![CDATA[
                        import mx.controls.Button;
                        
                        import mx.events.DragEvent;
                        import mx.core.DragSource;
                        import mx.managers.DragManager;
                
                        private function initApp():void{
                                maximize();
                                var myButton:Button = new Button;
                                myButton.y = 1355;
                                myButton.x = 60;
                                myButton.label = "Drag Me";
                                myButton.addEventListener
(MouseEvent.MOUSE_MOVE, mouseMoveHandler,false,0,true);
                                myDropCanvas.addChild(myButton);
                                myDropCanvas.verticalScrollPosition = 
1255;
                        }
                        private function mouseMoveHandler
(event:MouseEvent):void {
                                if (event.currentTarget is Button){
                                        var myProxy:Button = 
event.currentTarget as Button
                                        var 
dragInitiator:Button=Button(event.currentTarget);
                                        var ds:DragSource = new 
DragSource();
                                        ds.addData
(dragInitiator,"dragAppt");
                                        DragManager.doDrag
(dragInitiator, ds, event, myProxy, 0, 0,1.0,true);
                                        txtDragMouseY.text = 
myDropCanvas.mouseY.toString();
                                }
                                trace ("Mouse Move Trace: " + 
myDropCanvas.mouseY);
                        }
                        private function dragEnterHandler
(event:DragEvent):void{
                        if (event.dragSource.hasFormat("dragAppt"))
                        {
                            DragManager.acceptDragDrop(Canvas
(event.currentTarget));
                        }
                        }
                        
                        private function dragDropHandler
(event:DragEvent):void{
                        Button(event.dragInitiator).y = Canvas
(event.currentTarget).mouseY; 
                        trace ("Drag Drop Trace: " + 
myDropCanvas.mouseY);                                   
                        }
                ]]>
        </mx:Script>
        <mx:Canvas id="myDropCanvas" top="5" bottom="0" width="100%" 
verticalScrollPolicy="on" dragEnter="dragEnterHandler(event);" 
dragDrop="dragDropHandler(event);" click="trace (stage.mouseY);" 
left="180">
                <mx:VRule left="53" top="16" width="5" height="2875" 
styleName="gridVerticalLines"/>
        </mx:Canvas>
        <mx:Label x="0" y="10" text="Canvas Mouse Y During Drag" 
fontWeight="bold"/>
        <mx:Text left="10" top="36" id="txtDragMouseY"/>
</mx:WindowedApplication>