Question

I have applied drag and drop option in SWT tree viewer and it is working quite fine but i want to allow DND to only a particular sub tree type. I did it by suitable check. Now the problem is that those tree node on which i have not applied DND is draggable though they could not be dropped due to my check.
I want to stop them for being draggable too.

Please suggest what could be the problem which i am not able to see.

Answer 1

You can override the method:

public void org.eclipse.swt.dnd.DragSourceAdapter.dragStart(final DragSourceEvent event) {
 if (... some condition) {
    event.doit = false; // this will cancel DnD operation
 }
}