yuxiangtong / flex-drag-n-drop-lib Goto Github PK

Once DnDManager.doDrag is called from an event triggered by a complicated 
component, it would throw up something like:

x.core::UITextField@###### can not be converted to mx.core.UIComponent

that was because event.target is the precise element user drags, and it may 
not be an UIComponent. I think the solution is change line 74 of 
DnDManager.as:

    _dragInitiator = UIComponent(evt.target);

to:

    _dragInitiator = UIComponent(evt.currentTarget);

What steps will reproduce the problem?
1. place a break point on DnDManager.doDrag()
2. run a debug session
3. perform a drag action

What is the expected output? What do you see instead?

A Run Time Error is thrown from within the
mx.managers.dragClasses::DragProxy.mouseUpHandler where it makes generates
a null pointer reference on the lastMouseEvent property.  I suspect that
the act of debugging causes a mouseLeaveHandler on the stage to trigger
during the processing of the break point, breaking the logic to assign a
value to the lastMouseEvent.

Solutions will probably entail extending the DragProxy class in order to
check for the null value.

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