Why tree DND does not support COPY or INSERT?

The mx:Tree default drag - move only supports the MOVE. For example, you can drag an item from the tree and _move_ to tree B but cannot _add_ that the point b of the tree, unless you extend mx.controls.Tree, override dragDropHandler() and dragCompleteHandler() and, if lucky, write the right logic to calculate the insertion point and insert into the right place in the data structure tree, etc. etc.

Why application developers should do this just to add items from a tree to another?

I managed to do the minimum work to get what I need: drag and copy items from one tree to another. I outweigh tree: dragDropHandler () - If this is a MOVE operation, call great; Otherwise, I copied the MOVE code in Tree.as (less than 50 lines), then eliminated controls if (MOVE); with a little cheating on the namespace, the code simply works!
It is still beyond me why this behavior is not embedded in the Tree.as.

BTW, thanks for the pointer to the new DND doc!

-James

Tags: Flex

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