c - How to center a dialog window on the main window in GTK? -

i want print small warning messages. achieve that, i'm creating new window , want centered on main window. far i've tried setting parent gtk_widget_set_parent, using gtk_window_popup , gtk_window_toplevel nothing worked.

how center window on main window?

here's code function:

static void pop_warning(char *title, char *text) {     gtkwidget *warning_window;     gtkwidget *box;     gtkwidget *label;     gtkwidget *button;      warning_window = gtk_window_new(gtk_window_toplevel);     gtk_window_set_title(gtk_window(warning_window), title);     g_signal_connect(gtk_window(warning_window), "destroy", g_callback(gtk_widget_destroy), null);     gtk_container_set_border_width(gtk_container(warning_window), 20);     gtk_window_set_resizable(gtk_window(warning_window), false);          //window main window     gtk_widget_set_parent(warning_window, window);     gtk_window_set_position(gtk_window(warning_window), gtk_win_pos_center_on_parent);      box = gtk_box_new(gtk_orientation_vertical, 10);     gtk_container_add(gtk_container(warning_window), box);      label = gtk_label_new(text);     gtk_box_pack_start(gtk_box(box), label, true, false, 0);      button = gtk_button_new_with_label("ok");     g_signal_connect_swapped(button, "clicked", g_callback(gtk_widget_destroy), warning_window);     gtk_box_pack_start(gtk_box(box), button, true, false, 0);      gtk_widget_show_all(warning_window);     } 

gtk_window_set_position(gtk_window(warning_window), gtk_win_pos_center_on_parent); 

only works if first call

gtk_window_set_transient_for(gtkwindow *window, gtkwindow *parent); 

as mentioned explicitly in documentation.

you try use gtk_win_pos_center_always has not above mentioned constrain - @ least not according docs.