[accounts-dialog] Fix "Take a photograph" menu item sensitivity

[Bastien Nocera <hadess src gnome org>]

commit 70fde5e92632148e0ab6e3037d667bb8d80ac8d5
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Jan 21 14:28:01 2010 +0000

    Fix "Take a photograph" menu item sensitivity
    
    Follow whether there are any webcams available before offering
    it to users.

 configure.ac          |    2 +-
 src/um-photo-dialog.c |   53 +++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 50 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c0dcfb5..521fa18 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,7 +38,7 @@ PKG_CHECK_MODULES(DBUS_GLIB, dbus-glib-1)
 PKG_CHECK_MODULES(UNIQUE, unique-1.0)
 PKG_CHECK_MODULES(POLKIT, polkit-gtk-1)
 PKG_CHECK_MODULES(GCONF, gconf-2.0)
-PKG_CHECK_MODULES(CHEESE, cheese-gtk, have_cheese=yes, have_cheese=no)
+PKG_CHECK_MODULES(CHEESE, cheese-gtk > 2.29.6, have_cheese=yes, have_cheese=no)
 
 if test x$have_cheese = xyes ; then
 	AC_DEFINE(HAVE_CHEESE, 1, [Define to 1 to enable cheese webcam support])
diff --git a/src/um-photo-dialog.c b/src/um-photo-dialog.c
index 5161ba8..bd67dd5 100644
--- a/src/um-photo-dialog.c
+++ b/src/um-photo-dialog.c
@@ -31,6 +31,7 @@
 
 #ifdef HAVE_CHEESE
 #include <cheese-avatar-chooser.h>
+#include <cheese-camera-device-monitor.h>
 #endif /* HAVE_CHEESE */
 
 #include "um-photo-dialog.h"
@@ -45,6 +46,12 @@ struct _UmPhotoDialog {
         GtkWidget *popup_button;
         GtkWidget *crop_area;
 
+#ifdef HAVE_CHEESE
+        CheeseCameraDeviceMonitor *monitor;
+        GtkWidget *take_photo_menuitem;
+        guint num_cameras;
+#endif /* HAVE_CHEESE */
+
         GnomeDesktopThumbnailFactory *thumb_factory;
 
         UmUser *user;
@@ -283,6 +290,34 @@ webcam_icon_selected (GtkMenuItem   *menuitem,
                           G_CALLBACK (webcam_response_cb), um);
         gtk_widget_show (window);
 }
+
+static void
+update_photo_menu_status (UmPhotoDialog *um)
+{
+        if (um->num_cameras == 0)
+                gtk_widget_set_sensitive (um->take_photo_menuitem, FALSE);
+        else
+                gtk_widget_set_sensitive (um->take_photo_menuitem, TRUE);
+}
+
+static void
+device_added (CheeseCameraDeviceMonitor *monitor,
+              GObject                   *device,
+              UmPhotoDialog             *um)
+{
+        um->num_cameras++;
+        update_photo_menu_status (um);
+}
+
+static void
+device_removed (CheeseCameraDeviceMonitor *monitor,
+                const char                *id,
+                UmPhotoDialog             *um)
+{
+        um->num_cameras--;
+        update_photo_menu_status (um);
+}
+
 #endif /* HAVE_CHEESE */
 
 static void
@@ -346,12 +381,20 @@ setup_photo_popup (UmPhotoDialog *um)
         gtk_widget_show (menuitem);
 
 #ifdef HAVE_CHEESE
-        menuitem = gtk_menu_item_new_with_label (_("Take a photograph..."));
-        gtk_menu_attach (GTK_MENU (menu), GTK_WIDGET (menuitem),
+        um->take_photo_menuitem = gtk_menu_item_new_with_label (_("Take a photograph..."));
+        gtk_menu_attach (GTK_MENU (menu), GTK_WIDGET (um->take_photo_menuitem),
                          0, ROW_SPAN - 1, 2, 3);
-        g_signal_connect (G_OBJECT (menuitem), "activate",
+        g_signal_connect (G_OBJECT (um->take_photo_menuitem), "activate",
                           G_CALLBACK (webcam_icon_selected), um);
-        gtk_widget_show (menuitem);
+        gtk_widget_set_sensitive (um->take_photo_menuitem, FALSE);
+        gtk_widget_show (um->take_photo_menuitem);
+
+        um->monitor = cheese_camera_device_monitor_new ();
+        g_signal_connect (G_OBJECT (um->monitor), "added",
+                          G_CALLBACK (device_added), um);
+        g_signal_connect (G_OBJECT (um->monitor), "removed",
+                          G_CALLBACK (device_removed), um);
+        cheese_camera_device_monitor_coldplug (um->monitor);
 #endif /* HAVE_CHEESE */
 
         /* Separator */
@@ -496,6 +539,8 @@ um_photo_dialog_free (UmPhotoDialog *um)
 
         if (um->thumb_factory)
                 g_object_unref (um->thumb_factory);
+        if (um->monitor)
+                g_object_unref (um->monitor);
 
         if (um->user)
                 g_object_unref (um->user);