Drag & Drop / C++ Builder.

[zikar]

Hi,

After trying several things, I haven't been able to implement a drag & drop feature in a dialog baseed application, built with C++ Builder. If someone knows how to do this, please give me a tip (or/and a piece of code).

I had no problem when I tried something similar with MFC, but for some reason I can't get it OK with builder.

Thanks

 

[2ffat]

It really shouldn't too hard to impliment. In your OnMouseDown event you need to place a BeginDrag function. You will also need to have a OnDragDrop function and maybe OnDragOver, and Accept or Reject.
James P. Cottingham

I am the Unknown lead by the Unknowing.
I have done so much with so little
for so long that I am now qualified
to do anything with nothing.

 

[zikar]

Hello James,

Thanks for your suggestion.

I tried quite a few things, playing around with :
FormDragDrop, FormDragOver, FormMouseDown, FormMouseUp;
filling those functions with code like :
{
ShowMessage("FormMouseUp called."
}
in order to understand when they were called.

As a result I was able to check when FormMouseDown and FormMouseUp were called;
but FormDragDrop and FormDragOver were appearently never called. I don't really understand why.

But I don't get any thing by putting BeginDrag inside FormMouseDown (matching the OnMouseDown event), except crashing my program.

Well, there is certainly something I don't do right, but I don't know what.
Things would probably look much simpler and easier if I knew how to do it.
So if you happen to find a very basic C++ Builder sample program doing a drag and drop, please let me know.

Bye and thanks.

Michel

Note : Just in case you are interested, I made a simple software as a way for me to learn C++Builder, and I would like to implement a drag and drop feature in it. It is published as a freeware at :

http://www.vector.co.jp/soft/dl/win95/util/s0189531.html

 

[xGrob]

If you're talking about draging & dropping FILES into the application there is a sample program on Borland's site on the CodeCentral page that works:

http://codecentral.borland.com/codecentral/ccweb.exe/prodcat?prodid=2&catid=4

unfortunately you havet os 'sign up' to download it, but at least it's free..