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Dragging and dropping objects

Posted on 2003-10-28
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Last Modified: 2010-04-05
Hello!

I'm quite new to Delphi and I know how things should work in theory because I have been programming with other languages for years. I'm trying to make a simple image browser with one form.

On Form1 I have two Scrollboxes. In the first Scrollbox I would like to put the objects (thumbnail images which are created on run-time).

And then I have a second Scrollbox. The thumbnails which I have in Scrollbox1 are based on the code found at http://www.b-zone.de/zips/thmbnail.zip

The biggest problem I have is that I don't know how to drag a object from Scrollbox1 to Scrollbox2.
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Question by:mazze
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Accepted Solution

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huferry earned 125 total points
ID: 9632848
The theory is:

The source component:
- Set the property DragMode to dmAutomatic
- Use the event OnStartDrag
- Pass your parameter as an TDragObject instance

The target component:
- Use the event OnDragOver, based on the Sender and
  the Source you can decide either to accept or reject it.
- Sender = source component; Source = Drag object
- Use the event OnDragDrop to handle the object dropping.
  Again, you'll get the Sender and the Source
- TDragObject will be automatically destroyed.

happy trying!

regards,
huferry
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Author Comment

by:mazze
ID: 9640111
Thanks! I finally solved the problem even if it took several hours for me to do it.
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