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Highlight list box when not focused in Delphi

Posted on 2009-04-14
1
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Last Modified: 2013-11-23
In my Delphi 7 app I have a listbox and buttons to enable the user to move items up or down in the listbox. However, as soon as either button is clicked the highlight in the list box disappears. I would like to keep the highlight and have tried using SendMessge with the LB_SETCARETINDEX message but this does not work. The code is below and I would like to know how to get this to work.

procedure TfrmMain.cmdMoveUpClick(Sender: TObject);

var CurrIndex: integer;

begin

  with lstSelectedImages do

    if ItemIndex > 0 then begin

      CurrIndex:=ItemIndex;

      Items.Move(ItemIndex, (CurrIndex - 1));

      ItemIndex:=CurrIndex-1;

      SendMessage(lstSelectedImages.Handle, LB_SETCARETINDEX, ItemIndex, 0);

    end;

end;

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Question by:galcott1
1 Comment
 
LVL 14

Accepted Solution

by:
SteveBay earned 500 total points
ID: 24144183
Try this. It works well for me.
procedure TForm1.btnMoveUpClick(Sender: TObject);

var Index : Integer;

begin

     if lst1.ItemIndex > 1 then

          begin

          Index := lst1.ItemIndex  -1;

          lst1.Items.Move(lst1.ItemIndex, Index);

          lst1.ItemIndex := Index;

          lst1.Selected[Index] := True;

          lst1.SetFocus

          end;
 

end;
 

procedure TForm1.btnMoveDnClick(Sender: TObject);

var Index : Integer;

begin

     if (lst1.ItemIndex > 0) and (lst1.ItemIndex < lst1.Items.Count -1) then

          begin

          Index := lst1.ItemIndex  +1;

          lst1.Items.Move(lst1.ItemIndex, Index);

          lst1.ItemIndex := Index;

          lst1.Selected[Index] := True;

          lst1.SetFocus

          end;

end;

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