Multiple toplevel windows problem

Roccivic · **Joined:** Tue Mar 03, 2009 6:03 pm **Posts:** 15

Hi all,

I'm trying to make a program with 2 toplevel windows. With below code it somewhat works. After I launch the program, if I click on the preferences button it shows me the preferences window, but after I close the latter clicking on the preferences button does not show the preferences window anymore and just returns this error in the terminal:

[code=]Gtk-CRITICAL **: gtk_widget_show_all: assertion `GTK_IS_WIDGET (widget)' failed [/code]

Many thanks for any help in advance,
Rouslan

Code:

/* Create preference window */
   pref_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_window_set_resizable (GTK_WINDOW (pref_window), FALSE);
   gtk_widget_set_size_request (pref_window, 400, 250);


   g_signal_connect (GTK_OBJECT (pref_window), "destroy",
           G_CALLBACK (gtk_widget_destroy), pref_window);

   gtk_window_set_title (GTK_WINDOW (pref_window), "Preferences");
   gtk_container_set_border_width (GTK_CONTAINER (pref_window), 0);

   vbox = gtk_vbox_new (FALSE, 0);
   gtk_container_add (GTK_CONTAINER (pref_window), vbox);


/* Create main window */
   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
   gtk_widget_set_size_request (window, 800, 700);


   g_signal_connect (GTK_OBJECT (window), "destroy",
           G_CALLBACK (gtk_main_quit), NULL);

    gtk_widget_show (window);

   gtk_window_set_title (GTK_WINDOW (window), "Main window");
   gtk_container_set_border_width (GTK_CONTAINER (window), 0);

   hbox = gtk_hbox_new (FALSE, 0);
   gtk_container_add (GTK_CONTAINER (window), hbox);

// here goes the rest of the code

   config_button = gtk_button_new_from_stock (GTK_STOCK_PREFERENCES);
   g_signal_connect (GTK_OBJECT (config_button), "clicked",
              G_CALLBACK (show_prefs), NULL);
   gtk_box_pack_start (GTK_BOX (vbox), config_button, TRUE, TRUE, 5);

The callback:

Code:

void show_prefs() {
   gtk_widget_show_all (pref_window);
}

tadeboro · **Posted:** Tue Mar 10, 2009 9:33 pm

Hello.

The problem you're experiencing is caused by the destruction of the preferences window. When you click close button, preference window is destroyed.

To avoid this problem, replace these two lines:

Code:

   g_signal_connect (GTK_OBJECT (pref_window), "destroy",
             G_CALLBACK (gtk_widget_destroy), pref_window);

with these two:

Code:

   g_signal_connect (GTK_OBJECT (pref_window), "delete-event",
             G_CALLBACK (gtk_widget_hide_on_delete), NULL);

Docs: http://library.gnome.org/devel/gtk/stable/GtkWidget.html#gtk-widget-hide-on-delete

Roccivic · **Joined:** Tue Mar 03, 2009 6:03 pm **Posts:** 15

Many thanks, tadeboro. It worked perfectly :D

Rouslan

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