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Delphi 7 :: TListView on ItemSelect mouse drag cursor

Marius0188
Marius0188 asked
on
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Last Modified: 2012-08-14
Dear Friends,

I have a TListView which have several items in.
OnSelectItem event I make calls to a procedure which in return calls 2 other procedures
to run the relevant process for the selected item.

The TListView.DragMode = dmAutomatic.
I do call Application.ProcessMessages where any loops etc occur.
The problem is when selecting an Item and the process are a bit lengthy (not much) then when
releasing the mouse (normal single click) the cursor turns to the drag&drop cursor. Although I did not press and hold the mouse.

When I press and hold the mouse button down for while and then releasing then the problem
do not occur.


Any suggestion on how to solve this?

Thanks!
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Mike LittlewoodEngineer
Commented:
Have you tried just putting a processmessages first in the OnSelectItem to see if it will clear it.

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Author

Commented:
Yes I have done that as well.

And all the calling Procedures as well.


Why does  Delphi's components sometimes seem to be so difficult for a simple
instruction like this? :) (Just feel like mowning today).

Top Expert 2007
Commented:
Just a workaround, but you could try to move the code into the MouseUp event. Something like this:

procedure TForm1.ListView1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
   if ListView1.Selected<>nil then
     if ListView1.GetItemAt(X,Y)=ListView1.Selected then begin

      //Do stuff with ListView1.Selected

     end;
end;

Author

Commented:
Is there not a way I can fix the problem rather?
Dont wish to move my code to OnMouseUp as first option.

Any other suggestion?
You could try changing the drag mode youreslf after your procedure has finished executing

eg

procedure TForm1.ListView1SelectItem(Sender: TObject; Item: TListItem;
  Selected: Boolean);
begin
  ListView1.DragMode := dmManual;
  callsleep;  // your ptocedure here
  ListView1.DragMode := dmAutomatic;
end;
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