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TreeView Component

Posted on 1998-12-16
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Last Modified: 2009-07-29
I am trying to drag a TTreeNode from one TTreeView component to another using the onDragDrop event. I have set the DragMode to dmAutomatic for both components but at run time when I select a node, it seems to picking up the TTreeView component itself rather than the selected node.

So, as soonas I began dragging, the cursor changes to DragNoDrop preventing the onDragDrop event from occuring.

Have, I missed some vital property setting? I am using the standard code provided in the help for the OnDragDrop event, but I can't get the event to go off.

Lee Berry
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Question by:leeberry2
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williams2 earned 200 total points
ID: 1351341
When you set your Drag mthod to dmAutomatic, you'll have to provide some extra code to make the control accept the drag. This is done by this example:

procedure TForm1.TreeView1DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
begin
  Accept:= True;
end;


You will ofcourse have to to this on both TreeViews, but then it will work allright.

Regards,
Williams

BTW: If you are trying to use drag and drop with files, this will need special handling.. then use the components on www.melander.dk, they provide all the functions you'll need for that.
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