MouseHover event during drag and drop operations

[Guest]

Hi,

I am writing a classic, "Explorer"-like app in vb.net 2003 (dotnetfx1.1).

I have written code to handle the dragging and dropping of items from a
ListView on the right hand part of the form to a TreeView on the left part of
the form. When the user pauses over a node in the TreeView in the middle of a
drag and drop operation, I'd like the node to automatically expand to reveal
the child nodes, just as you see in many commercial applications. However, I
am unable to create this behaviour because the TreeView control does not fire
the MouseHover event whilst in the middle of a drag and drop operation.

Are there any workarounds to this?

Regards,

James

 

[Stoitcho Goutsev \(100\)]

James,

During drag and drop operations no mouse messages are sent. In this case
windows enters special modal loop and sends special drag&drop notifcations
to the window under the mouse curosor if registered as potential drop
target.

In windows forms instead of expecting mouse events during D&D you need to
process: DragEnter, DragLeave, DragOver and DragDrop events. DragOver is
equivalent to MouseHover.

 

[Guest]

Thanks for this.

How would I simulate a MouseHover event during the DragOver event?

James

 

[Stoitcho Goutsev \(100\)]

Why do you want to simulate it? Just use DragOver.

 

[Guest]

Well, I have a similar issue. For my app, I would like to process keyboard
input and or the mouse wheel during a drop operation. DoDragDrop eats all
mouse and keybouard input. The only thing I can get at is mouse button state
and the esc, ctrl, alt and shift keys which MS views as primarily relevant
for a dragdrop operation.

So... how can I get mouse wheel and keypress events or state from within
DragHover or anywhere else in the few methods available for handling drag
drop?