Move form without border style

Question

how do I move a borderless form? I tried looking on the internet, but nothing. Thanks a lot.

Answer 1

You can drag a form using any contained control, including itself.

Using the following example, you can move a form by clicking on its canvas and dragging. You could do the same with a panel on the form by putting the same code in the panel's MouseDown event, which would let you create your own pseudo caption bar.

procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
const
  SC_DRAGMOVE = $F012;
begin
  if Button = mbLeft then
  begin
    ReleaseCapture;
    Perform(WM_SYSCOMMAND, SC_DRAGMOVE, 0);
  end;
end;

Answer 2

If you mean dragging the window by the mouse, you can override WM_NCHITTEST message handling and return HTCAPTION for the drag region. The below will drag the window within the upper 30 pixels for insance:

type
  TForm1 = class(TForm)
  private
  protected
    procedure WMNCHitTest(var Message: TWMNCHitTest); message WM_NCHITTEST;
  end;

..

procedure TForm1.WMNCHitTest(var Message: TWMNCHitTest);
var
  Pt: TPoint;
begin
  Pt := ScreenToClient(SmallPointToPoint(Message.Pos));
  if Pt.Y < 30 then
    Message.Result := HTCAPTION
  else
    inherited;
end;