[Lazarus] Colouring StringGrids

Michael Van Canneyt michael at freepascal.org
Tue Jul 15 15:15:49 CEST 2008

On Tue, 15 Jul 2008, Dave Coventry wrote:

> Hi,
> I'm using the following code to (unsuccessfully) colour the fields of
> a row in a tstringgrid if the second column is empty.
>       if StringGrid2.Cells[1,i]='' then
>       begin
>         PriceHeader:=true;
>         StringGrid2.Repaint;
>       end;

This kind of logic should only be used in the PrepareCanvas or DrawCall

> procedure TForm1.StringGrid2DrawCell(Sender: TObject; aCol, aRow: Integer;
>   aRect: TRect; aState: TGridDrawState);
> var oldColour:TColor;
>   oldBrush: TBrush;
> begin

I would insert here

  PriceHeader:=(ACol=1) and (ARow=Something) and (Cells[ACol,Something]='');

And make PriceHeader a local variable.


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