GridLineWidth (Delphi)

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Description

The following code uses the bitmaps in an image list component to draw the contents of each cell in a draw grid. This example includes a draw grid on a form. When the application runs and the form is created, the width of the lines on the draw grid changes if the default column width of the grid is over 90 pixels wide. This example requires a populated image list, or can just display an empty grid. Set the drawgrid DefaultColWidth and GridLineWidth statically to values that cause a click on the button to do something.

Code

procedure TForm1.Button1Click(Sender: TObject);
begin
  if DrawGrid1.DefaultColWidth > 90 then
    DrawGrid1.GridLineWidth := 2
  else
    DrawGrid1.GridLineWidth := 1;
end;

procedure TForm1.DrawGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
  Rect: TRect; State: TGridDrawState);
var
  index: Integer;
begin
  index := ARow * DrawGrid1.ColCount + ACol;
  DrawGrid1.Canvas.Brush.Color := clBackground;
  DrawGrid1.Canvas.FillRect(Rect);
  ImageList1.Draw(DrawGrid1.Canvas,Rect.Left,Rect.Top,index, True);
  if (gdFocused in State) then
  begin
    DrawGrid1.Canvas.DrawFocusRect(Rect);
  end;
end;

procedure TForm1.DrawGrid1SelectCell(Sender: TObject; ACol, ARow: Integer;
  var CanSelect: Boolean);
begin
  CanSelect:= True;
end;

Uses

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