RE: How to modify textview default vertical scrollbar position

["Josepo Urrutia" <find_all hotmail com>]

To do what you say I use the following code.

/* *******************************
  textbuffer_puerto_changed
  **************************** */
// Funcion q salta cada vez q se modifica el textbuffer_puerto
void window_principal::textbuffer_puerto_changed()
{

 // Utilizamos esta funcion para poder mover el scroll sobre el textview
 // y no perder el texto cuando hay muchas lineas

 bool scroll = false;
 if (scroll_window.get_vadjustment()->get_value() >= 
(this->scroll_window.get_vadjustment()->get_upper() - 
this->scroll_window.get_vadjustment()->get_page_size() - 1e-12))
   scroll = true;

 if (scroll)
 {
    Glib::RefPtr<Gtk::TextBuffer> buffer = textview_puerto.get_buffer();
   Glib::RefPtr<Gtk::TextBuffer::Mark> pos;
   pos = buffer->create_mark(buffer->end());
   buffer->move_mark(pos, buffer->end());
   textview_puerto.scroll_to_mark(pos, 0.0);
 }

} // Fin de textbuffer_puerto_changed


This function must be connected to the changed signal of the textbuffer :

with gtkmm 2.2
textbuffer_puerto->signal_changed().connect(SigC::slot(*this,&window_principal::textbuffer_puerto_changed));

with gtkmm2.4 or higher
textbuffer_puerto->signal_changed().connect(sigc::mem_fun(*this,&window_principal::textbuffer_puerto_changed));


> From: "Mario Segura" <masegurita gmail com>
> To: gtkmm-list <gtkmm-list gnome org>
> Subject: How to modify textview default vertical scrollbar position
> Date: Sat, 29 Apr 2006 19:01:32 -0400
>
> Hi,
>
> I use a textview widget and I insert text using its buffer. The method I 
> use
> is "insert_at_cursor".
> I will like to modify the position of the vertical scrollbar, because if i
> write several lines (more than the ones the window can display) the 
> vertical
> scrollbar appear but is fixed in the upper position while the text is
> inserted at the button of the buffer, so it isn't displayed.
> The contengency solution I did was to set the value of the vertical
> scrollbar (to the bottom) everytime i write a new line, but i think isn't
> the right way to do it.
>
> Any idea how to fix the vertical scrollbar in the bottom instead of the top
> position?
>
> Thanks,
>
>
>
> ---Code
>
>    string line = "ANYTHING \n";
>    consolabuffer->insert_at_cursor(line);
>
>    //Vertical scrollbar adjustment. Contengency solution  ***********
>    Gtk::Adjustment *ajustev;
>    ajustev = consolaventana.get_vadjustment();
>    ajustev->set_value(ajustev->get_upper());
>
> ---End
>
> --Variables
>        Gtk::TextView consolaview;
>        Glib::RefPtr<Gtk::TextBuffer> consolabuffer;
> --End of variables
>
>
> --
> Mario Segura S.


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