DrawGridCol (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. It uses a draw grid with a label above it on a form. When the user clicks a cell in the grid, the location of the cursor is displayed in the label caption. This example requires a populated image list, or can just display an empty grid.

Code

procedure TForm1.DrawGrid1Click(Sender: TObject);
begin
  Label1.Caption := 'From OnClick: The cursor is in column ' +
                     IntToStr(DrawGrid1.Col + 1) + 
                     ', row ' +
                     IntToStr(DrawGrid1.Row + 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);
    Label2.Caption:= 'From OnDrawCell: Cell ' + InttoStr(index) + ' has the focus.';
  end;
end;

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

Uses

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