1 
Glib::RefPtr< Gdk::Display > display = Gdk::Display::get_default() ;
if( nullptr == display )
{
    return ;
}

Gdk::Rectangle geo ;
Glib::RefPtr< Gio::ListModel > monitors = display->get_monitors() ;
for( uint8_t pos = 0 ; pos < monitors->get_n_items() ; ++pos )
{
    Glib::RefPtr< ObjectBase > item = monitors->get_object( pos ) ;
    Glib::RefPtr< Gdk::Monitor > monitor = std::dynamic_pointer_cast< Gdk::Monitor >( item ) ;
    if( nullptr == monitor )
    {
        continue ;
    }

    monitor->get_geometry( geo ) ;
    break ;
}



int width , height ;
get_default_size( width , height ) ;

int posX = geo.get_width()  / 2 - width  / 2 ;
int posY = geo.get_height() / 2 - height / 2 ;

This code is to try to move postion, but I dont't know how to move the position of Gtk::Window under gtkmm4.

In GTK 3 , gtkmm 3, move() or set_position(Gtk::WIN_POS_CENTER) is used, but now I don't know how to move the postion.

Improve this question
2
  • Where in this code are you setting the position? Commented Sep 5 at 6:56
  • Not sure, but this post might be of some use. Commented Sep 5 at 10:14
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