Question

How to detect if mouse is in "Drag-Mode" ...?

Asked by: hasnpapa

Hello, dear friend!

I'm using Borland C++.

I have a simple form to categorize my MP3s, with a TTreeView in it.

When I drag a file from *outside* my application into my TTreeView, then there are absolutle none events getting fired. In other words, 'ondragover', 'onmousemove' and so on does't work.

Of course I set "DragAcceptFiles(...)" and 'OnDragDrop' works. But I need to know if the mouse drag files *bevore* OnDragDrop is fired, I ned this information just when the mouse enters my application to do some graphical things.

Does anyone know, how to detect if the mouse is in "Drag-Mode" and
hold files when it enters my application?

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Asked On
2009-08-28 at 01:10:19ID24689080
Topics

C / C++ / C# Editors and IDEs

,

C Programming Language

,

C++ Programming Language

Participating Experts
3
Points
500
Comments
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Answers

 

by: pgnatyukPosted on 2009-08-28 at 06:03:48ID: 25207122

Window receives WM_MOUSEMOVE when the mouse cursor is in it.

Here is an info about the mouse input:

http://msdn.microsoft.com/en-us/library/ms645533(VS.85).aspx

I don't know enough this drag and drop topic. Probably, if I'd need it, I'd use WM_MOUSEMOVE.

But, maybe, this info will help you:

 DragDetect: http://msdn.microsoft.com/en-us/library/ms646256(VS.85).aspx

if (DragDetect(hWnd, pointCursorPos) ) do_something();

Here is an article about Drag and Drop: http://www.suodenjoki.dk/us/productions/articles/dragdroptab.htm It looks not bad.

 

by: jkrPosted on 2009-08-28 at 09:58:21ID: 25209554

Why not implementing IDropTarget (http://msdn.microsoft.com/en-us/library/ms679679(VS.85).aspx) and registering that via 'RegisterDrogDrop()' (http://msdn.microsoft.com/en-us/library/ms678405(VS.85).aspx)? You'll then be notified about that via 'IDropTarget::DragEnter()' (http://msdn.microsoft.com/en-us/library/ms680106(VS.85).aspx)

 

by: itsmeandnobodyelsePosted on 2009-08-29 at 05:56:06ID: 25213884

>>>> Window receives WM_MOUSEMOVE when the mouse cursor is in it.
That is true only if mouse was captured. But I would assume it is still captured by the DragDrop operation and only one window can capture the mouse at one time.

Even if you could capture the mouse it is that you would need to get an initial trigger when the mouse was entering the application. As the mouse clicks were done outside they can't be the trigger. I would think the trick is to have your main application window be a DropTarget what probably is what (or similar to) jkr has suggested (I don't know enough from using COM and Borland, though).

Check your main window class if you can make it a drop target (same as the tree window) and if so, try to implement the DragEnter (see jkr's comment above) which seems to be the event you were searching for and should be available for all drag target capable windows.

 

by: hasnpapaPosted on 2009-08-31 at 01:04:19ID: 25221140

Thanks a lot for your kindly suggsetions :-)

I'll check this tomorrow and give you response then, because on mondays are allways a lot of things to do here ...

 

by: hasnpapaPosted on 2009-09-01 at 02:15:38ID: 31621615

Thanks a lot!
I was on the wrong way.

IDroptarget works great now!

:-))

20120131-EE-VQP-002

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