[totem] DVD navigation: Set a flag 'is_menu' whenever there are buttons

[Jan Schmidt <jschmidt src gnome org>]

commit 989331bbe8430e3d7736597e4d827969f5e49fc2
Author: Jan Schmidt <thaytan noraisin net>
Date:   Wed May 13 13:20:25 2009 +0100

    DVD navigation: Set a flag 'is_menu' whenever there are buttons
    
    2009-05-13  Jan Schmidt  <thaytan noraisin net>
    
            * src/backend/bacon-video-widget-gst-0.10.c
            (bvw_do_navigation_query), (bvw_handle_element_message),
            (bacon_video_widget_has_menus):
            * src/backend/bacon-video-widget.h:
    
            Provide a method to know if there are buttons currently
            onscreen.
---
 ChangeLog                                 |   10 +++++
 src/backend/bacon-video-widget-gst-0.10.c |   56 ++++++++++++++++++++++++++++-
 src/backend/bacon-video-widget.h          |    2 +
 3 files changed, 67 insertions(+), 1 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 063bd35..2ed4bd3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2009-05-13  Jan Schmidt  <thaytan noraisin net>
 
+	* src/backend/bacon-video-widget-gst-0.10.c
+	(bvw_do_navigation_query), (bvw_handle_element_message),
+	(bacon_video_widget_has_menus):
+	* src/backend/bacon-video-widget.h:
+
+	Provide a method to know if there are buttons currently
+	onscreen.
+
+2009-05-13  Jan Schmidt  <thaytan noraisin net>
+
 	* src/backend/bacon-video-widget-gst-0.10.c (bvw_element_msg_sync):
 	Avoid a race with xoverlay interface discovery. Because the
 	update_interface implementations function only searches for interfaces
diff --git a/src/backend/bacon-video-widget-gst-0.10.c b/src/backend/bacon-video-widget-gst-0.10.c
index af73ab0..fa3847c 100644
--- a/src/backend/bacon-video-widget-gst-0.10.c
+++ b/src/backend/bacon-video-widget-gst-0.10.c
@@ -186,6 +186,7 @@ struct BaconVideoWidgetPrivate
   gboolean                     fullscreen_mode;
   gboolean                     auto_resize;
   gboolean                     uses_fakesink;
+  gboolean                     is_menu;
   
   gint                         video_width; /* Movie width */
   gint                         video_height; /* Movie height */
@@ -1286,6 +1287,21 @@ bvw_handle_application_message (BaconVideoWidget *bvw, GstMessage *msg)
   }
 }
 
+static gboolean
+bvw_do_navigation_query (BaconVideoWidget * bvw, GstQuery *query)
+{
+  GstNavigation *nav = bvw_get_navigation_iface (bvw);
+  gboolean res;
+
+  if (G_UNLIKELY (nav == NULL || !GST_IS_ELEMENT (nav)))
+    return FALSE;
+
+  res = gst_element_query (GST_ELEMENT_CAST (nav), query);
+  gst_object_unref (GST_OBJECT (nav));
+
+  return res;
+}
+
 static void
 bvw_handle_element_message (BaconVideoWidget *bvw, GstMessage *msg)
 {
@@ -1351,7 +1367,33 @@ bvw_handle_element_message (BaconVideoWidget *bvw, GstMessage *msg)
         }
         gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET(bvw)),
             bvw->priv->cursor);
-        break;
+        goto done;
+      }
+      case GST_NAVIGATION_MESSAGE_COMMANDS_CHANGED: {
+        GstQuery *cmds_q = gst_navigation_query_new_commands();
+        gboolean res = bvw_do_navigation_query (bvw, cmds_q);
+
+        if (res) {
+          gboolean is_menu = FALSE;
+          gint i, n;
+
+          if (gst_navigation_query_parse_commands_length (cmds_q, &n)) {
+            for (i = 0; i < n; i++) {
+              GstNavigationCommand cmd;
+              if (!gst_navigation_query_parse_commands_nth (cmds_q, i, &cmd))
+                break;
+              is_menu |= (cmd == GST_NAVIGATION_COMMAND_ACTIVATE);
+              is_menu |= (cmd == GST_NAVIGATION_COMMAND_LEFT);
+              is_menu |= (cmd == GST_NAVIGATION_COMMAND_RIGHT);
+              is_menu |= (cmd == GST_NAVIGATION_COMMAND_UP);
+              is_menu |= (cmd == GST_NAVIGATION_COMMAND_DOWN);
+            }
+          }
+          bvw->priv->is_menu = is_menu;
+        }
+
+        gst_query_unref (cmds_q);
+        goto done;
       }
       default:
         break;
@@ -4330,6 +4372,18 @@ done:
   return ret;
 }
 
+gboolean
+bacon_video_widget_has_menus (BaconVideoWidget *bvw)
+{
+    g_return_val_if_fail (bvw != NULL, FALSE);
+    g_return_val_if_fail (BACON_IS_VIDEO_WIDGET (bvw), FALSE);
+
+    if (bacon_video_widget_is_playing (bvw) == FALSE)
+        return FALSE;
+
+    return bvw->priv->is_menu;
+}
+
 /**
  * bacon_video_widget_set_video_property:
  * @bvw: a #BaconVideoWidget
diff --git a/src/backend/bacon-video-widget.h b/src/backend/bacon-video-widget.h
index f876ed0..616cfe9 100644
--- a/src/backend/bacon-video-widget.h
+++ b/src/backend/bacon-video-widget.h
@@ -372,6 +372,8 @@ void bacon_video_widget_set_video_property       (BaconVideoWidget *bvw,
 						  BvwVideoProperty type,
 						  int value);
 
+gboolean bacon_video_widget_has_menus            (BaconVideoWidget *bvw);
+
 /* DVD functions */
 /**
  * BvwDVDEvent: