[four-in-a-row] Disallow multiple windows (nonsense gameplay)

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 86dd19192d576416a437dfcbe15cf7fd0c525d02
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Sep 25 17:52:24 2014 -0500

    Disallow multiple windows (nonsense gameplay)

 src/main.c |   31 ++++++++++++++++---------------
 1 files changed, 16 insertions(+), 15 deletions(-)
---
diff --git a/src/main.c b/src/main.c
index 700830f..495f092 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1088,8 +1088,8 @@ static const GActionEntry app_entries[] = {
   {"about", on_help_about, NULL, NULL, NULL}
 };
 
-static gboolean
-create_app (void)
+static void
+create_app (GApplication *app, gpointer user_data)
 {
   GtkWidget *frame;
   GMenu *app_menu, *section;
@@ -1166,20 +1166,20 @@ create_app (void)
 
   g_simple_action_set_enabled (G_SIMPLE_ACTION (hint_action), FALSE);
   g_simple_action_set_enabled (G_SIMPLE_ACTION (undo_action), FALSE);
-
-  gtk_widget_show_all (window);
-
-  gfx_refresh_pixmaps ();
-  gfx_draw_all ();
-
-  scorebox_update ();       /* update visible player descriptions */
-  prompt_player ();
-
-  game_reset ();
-  return TRUE;
 }
 
-
+static void
+activate (GApplication *app, gpointer user_data)
+{
+  if (!gtk_widget_is_visible (window)) {
+    gtk_widget_show_all (window);
+    gfx_refresh_pixmaps ();
+    gfx_draw_all ();
+    scorebox_update ();       /* update visible player descriptions */
+    prompt_player ();
+    game_reset ();
+  }
+}
 
 int
 main (int argc, char *argv[])
@@ -1195,7 +1195,8 @@ main (int argc, char *argv[])
   textdomain (GETTEXT_PACKAGE);
 
   application = gtk_application_new ("org.gnome.four-in-a-row", 0);
-  g_signal_connect (application, "activate", G_CALLBACK (create_app), NULL);
+  g_signal_connect (application, "startup", G_CALLBACK (create_app), NULL);
+  g_signal_connect (application, "activate", G_CALLBACK (activate), NULL);
 
   context = g_option_context_new (NULL);
   g_option_context_add_group (context, gtk_get_option_group (TRUE));