Title: How to colour alternate rows in a DBGrid
The appearance of a DBGrid control may be improved by alternating the colour of each row. The following code colours the odd numbered rows clAqua and the even numbered rows clWhite.
First, you need to set the
DefaultDrawing
property of the grid to FALSE.
Second, you need to code an
ColumnCellDraw
event handler for the grid similar to this:
CODE
procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
DataCol: Integer; Column: TColumn; State: TGridDrawState);
const
RowHeight = 18;
begin
DBGrid1.Canvas.Font.Color := clBlack;
if Odd(rect.top div RowHeight) then
DBGrid1.canvas.Brush.Color := clAqua
else
DBGrid1.Canvas.Brush.Color := clWhite;
DBGrid1.canvas.TextRect(rect,rect.Left,rect.top,table.fields[DataCol].AsString);
end;
Note that this routine assumes that the font size is 8 and that the row height is 18. If you use a different font size then you will need to adjust RowHeight.
Finally, you need to code an
AfterScroll
event handler for the Dataset that provides data to the DBGrid to ensure that the DBGrid is redrawn properly.
CODE
procedure TForm1.TableAfterScroll(DataSet: TDataSet);
begin
DBGrid1.Invalidate;
end;