[gnome-control-center/extensible-shell] shell: Add single instance support

[Thomas Wood <thos src gnome org>]

commit fbb26e2477ede705b87f9da9d6faab4fcf74af00
Author: Thomas Wood <thomas wood intel com>
Date:   Wed Mar 24 16:08:04 2010 +0000

    shell: Add single instance support
    
    Use libunique to add single instance support to the shell to prevent
    multiple instances of the shell being started. If a second instance is
    started it will raise the existing instance and quit.

 shell/control-center.c |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)
---
diff --git a/shell/control-center.c b/shell/control-center.c
index 0c405b9..84dde76 100644
--- a/shell/control-center.c
+++ b/shell/control-center.c
@@ -33,8 +33,15 @@
 #include "cc-shell.h"
 #include "shell-search-renderer.h"
 
+#include <unique/unique.h>
+
 #define W(b,x) GTK_WIDGET (gtk_builder_get_object (b, x))
 
+enum
+{
+  CC_SHELL_RAISE_COMMAND = 1
+};
+
 typedef struct
 {
   GtkBuilder *builder;
@@ -479,16 +486,40 @@ search_entry_clear_cb (GtkEntry *entry)
   gtk_entry_set_text (entry, "");
 }
 
+static UniqueResponse
+message_received (UniqueApp         *app,
+                  gint               command,
+                  UniqueMessageData *message_data,
+                  guint              time_,
+                  GtkWindow         *window)
+{
+  gtk_window_present (window);
+
+  return GTK_RESPONSE_OK;
+}
 
 int
 main (int argc, char **argv)
 {
   ShellData *data;
   GtkWidget *widget;
+  UniqueApp *unique;
 
   g_thread_init (NULL);
   gtk_init (&argc, &argv);
 
+  unique = unique_app_new_with_commands ("org.gnome.ControlCenter",
+                                         NULL,
+                                         "raise",
+                                         CC_SHELL_RAISE_COMMAND,
+                                         NULL);
+
+  if (unique_app_is_running (unique))
+    {
+      unique_app_send_message (unique, 1, NULL);
+      return 0;
+    }
+
   data = g_new0 (ShellData, 1);
 
   data->builder = (GtkBuilder*) cc_shell_new ();
@@ -527,6 +558,10 @@ main (int argc, char **argv)
 
   gtk_widget_show_all (data->window);
 
+  g_signal_connect (unique, "message-received", G_CALLBACK (message_received),
+                    data->window);
+
+
   if (argc == 2)
     {
       GtkTreeIter iter;