I have a simple mfc project built on a CDialog. I also have a class I call CDroppable that inherits from CStatic with an added OnDropFiles()-function.
What I do is I add a normal CStatic to my dialog, add a control variable, then change the control variable in the .h-file of the dialog to be a CDroppable instead of CStatic (I think this is fairly standard). I also modify the Accept Files behavior to true for the CStatic.
In my opinion this should mean that if I drag a file over the dialog anywhere outside the accepting window I should get the “invalid” icon, and inside the accepting window I should be able to drop it. That is at least how it worked in VS2005.
However now in VS2010 I can’t get it to work. The entire application displays the invalid drag icon. I can set Accept Files on the dialog itself and it will accept files correctly, but I don’t want the entire dialog to accept files, I want CDroppable to accept files.
Is it some obvious thing I have missed to activate? Some setting that needs to be changed?
MFC, making simple things impossible ™
Actually I found what was wrong.
I had a group box around the droppable area to indicate where it was. This was obviously a stupid idea as even though I had set it to transparent which I assumed would be enough, it still was in the way of the droppable area. I had to set it to disabled and after that it magically worked.
Sorry to take your time.