Reset a single form to its initial state

Question

I have multiple forms in one project: frmBooking, frmWelcome, frmAdmin. I want to reset frmBooking (i.e., reset it to its initial state, as if it's just created with all the components) by clicking a button. I tried doing the following:

frmBooking.Destroy;
Application.CreateForm(TForm, frmBooking);
frmBooking.Show;

The result, however, is that it just creates a blank form, not resetting the form to its initial state.

What can I do to reset the form?

Answer 1

Based on your initial approach I put together some code.

var
  theOwner: TComponent;
begin
  { make sure that we don't kill ourselves. 
    can be omitted if we are sure it cannot happen. }
  theOwner := Owner;
  while theOwner <> nil do begin
    if theOwner = frmBooking then
      raise Exception.Create('cannot recreate owner form');
    theOwner := theOwner.Owner;
  end;
  
  { find out who must be the owner of the newly created instance }
  theOwner := frmBooking.Owner;
  frmBooking.Free;
  frmBooking := TfrmBooking.Create(theOwner);
  frmBooking.Show;
end;