[gnome-desktop] Properly get the workarea for positioning the labels

[Matthias Clasen <matthiasc src gnome org>]

commit b4b3fbe614c245e5e2cc4ca431d0f5310eca6ed1
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Feb 9 22:08:02 2011 -0500

    Properly get the workarea for positioning the labels
    
    This fixes https://bugzilla.gnome.org/show_bug.cgi?id=641996

 libgnome-desktop/gnome-rr-labeler.c |   43 +++++++++++++++++++++++++++++++---
 1 files changed, 39 insertions(+), 4 deletions(-)
---
diff --git a/libgnome-desktop/gnome-rr-labeler.c b/libgnome-desktop/gnome-rr-labeler.c
index a5db10b..b316864 100644
--- a/libgnome-desktop/gnome-rr-labeler.c
+++ b/libgnome-desktop/gnome-rr-labeler.c
@@ -63,6 +63,38 @@ static void gnome_rr_labeler_finalize (GObject *object);
 static void create_label_windows (GnomeRRLabeler *labeler);
 static void setup_from_config (GnomeRRLabeler *labeler);
 
+static int
+get_current_desktop (GdkScreen *screen)
+{
+        Display *display;
+        Window win;
+        Atom current_desktop, type;
+        int format;
+        unsigned long n_items, bytes_after;
+        unsigned char *data_return = NULL;
+        int workspace = 0;
+
+        display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (screen));
+        win = XRootWindow (display, GDK_SCREEN_XNUMBER (screen));
+
+        current_desktop = XInternAtom (display, "_NET_CURRENT_DESKTOP", True);
+
+        XGetWindowProperty (display,
+                            win,
+                            current_desktop,
+                            0, G_MAXLONG,
+                            False, XA_CARDINAL,
+                            &type, &format, &n_items, &bytes_after,
+                            &data_return);
+
+        if (type == XA_CARDINAL && format == 32 && n_items > 0)
+                workspace = (int) data_return[0];
+        if (data_return)
+                XFree (data_return);
+
+        return workspace;
+}
+
 static gboolean
 get_work_area (GnomeRRLabeler *labeler,
 	       GdkRectangle   *rect)
@@ -78,6 +110,7 @@ get_work_area (GnomeRRLabeler *labeler,
 	long           *workareas;
 	int             result;
 	int             disp_screen;
+        int             desktop;
 	Display        *display;
 
 	display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (labeler->priv->screen));
@@ -116,11 +149,13 @@ get_work_area (GnomeRRLabeler *labeler,
 		return FALSE;
 	}
 
+        desktop = get_current_desktop (labeler->priv->screen);
+
 	workareas = (long *) ret_workarea;
-	rect->x = workareas[disp_screen * 4];
-	rect->y = workareas[disp_screen * 4 + 1];
-	rect->width = workareas[disp_screen * 4 + 2];
-	rect->height = workareas[disp_screen * 4 + 3];
+	rect->x = workareas[desktop * 4];
+	rect->y = workareas[desktop * 4 + 1];
+	rect->width = workareas[desktop * 4 + 2];
+	rect->height = workareas[desktop * 4 + 3];
 
 	XFree (ret_workarea);