How to auto fit/scale DBGrid's (or other similar) columns widths according to its contents?

Question

I am trying to make a frame with a DBGrid that will serve for more than 10 tables with half of its fields as defaults, and other fields exclusive for each table

Answer 1

What you have to do is to use the grid's canvas to measure the contents of each column and set the column's width accordingly. You can either iterate through the dataset or use the OnColumnDraw-Event to adjust the width on the fly.

Here's a sample (I had to use an offset of 5 pixels)

procedure TForm7.DBGridDrawColumnCell(Sender: TObject; const Rect: TRect;
  DataCol: Integer; Column: TColumn; State: TGridDrawState);
Var
  w : Integer;

begin
  w := 5+DBGrid.Canvas.TextExtent(Column.Field.DisplayText).cx;
  if w>column.Width then Column.Width := w;
end;

procedure TForm7.FormActivate(Sender: TObject);
Var
  i : Integer;

begin
  // Initialize width
  for I := 0 to DBGrid.Columns.Count - 1 do
    DBGrid.Columns[i].Width := 5 + DBGrid.Canvas.TextWidth(DBGrid.Columns[i].title.caption)
end;