Hi,

I'm using TTrackBar component. I can change position by moving mouse but how to go to position where mouse is clicked? When I do this, track position is moving only by PageSize value.

Ubuntu 12.04 64bit. GTK2

Regards

The exact behavior of native controls is controlled by the backend library (in this case Gtk), not Lazarus.

You can use a non-native control. Install the package located at lazarus/components/customdrawn and use the control TCDTrackBar and it will go to where you clicked. I think this requires Lazarus 1.1+

Thanks, I will try it

But one thing. Rhythmbox application on linux use gtk trackbar for music track and it can change position on mouse click. Maybe there is some "hack" for this?

Ok, I read that on GTK, middle mouse button is responsible for jump to position. So I am trying to simulate it:

procedure TForm1.TrackBar1Click(Sender: TObject);
begin
  PostMessage(TrackBar1.Handle, LM_MBUTTONDOWN, 0, 0);
  //TrackBar1.Perform(LM_MBUTTONDOWN,0,0);
end;

But it doesn't work. Here is some python solution but I don't understand it: https://mail.gnome.org/archives/gtk-list/2011-November/msg00032.html