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Database Programming

How to use multi-colored lines in a grid by svanels
Posted: 8 Sep 02

Sometimes we need to differentiate the records in a table based on a certain condition of a field.

In this example we use the employee table (in dbDemos), and make a division 3 salary groups. Also we will put the cursor in the 3rd column.


Needed: a form, a table or query, dbgrid etc.

1)Set the DefaultDrawing of the DBGrid to false

2)Use the OnDrawColumnCell event and type in:


procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
  DataCol: Integer; Column: TColumn; State: TGridDrawState);
begin
   if Table1.FieldByName('Salary').Value > 35000 then
    DBGrid1.Canvas.Font.Color := clRed
    else
    if Table1.FieldByName('Salary').Value > 25000 then
    DBGrid1.Canvas.Font.Color := clGreen;
    // Draw condition
  DBGrid1.DefaultDrawDataCell(Rect,dbgrid1.Columns[datacol].Field, State);

  Dbgrid1.SelectedIndex := 2;
    // Put cursor in the 3rd column
end;


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