1 files changed, 108 insertions, 0 deletions
diff --git a/plugins/xsettings/wm-common.c b/plugins/xsettings/wm-common.c
new file mode 100644
index 0000000..ccb9629
--- /dev/null
+++ b/plugins/xsettings/wm-common.c
@@ -0,0 +1,108 @@
+#include <X11/Xatom.h>
+#include <gdk/gdkx.h>
+#include <gdk/gdk.h>
+#include <string.h>
+#include <glib.h>
+#include <glib-object.h>
+#include "wm-common.h"
+
+/* Our WM Window */
+static Window wm_window = None;
+
+static char *
+wm_common_get_window_manager_property (Atom atom)
+{
+  Atom utf8_string, type;
+  int result;
+  char *retval;
+  int format;
+  gulong nitems;
+  gulong bytes_after;
+  gchar *val;
+
+  if (wm_window == None)
+    return NULL;
+
+  utf8_string = gdk_x11_get_xatom_by_name ("UTF8_STRING");
+
+  gdk_error_trap_push ();
+
+  val = NULL;
+  result = XGetWindowProperty (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
+		  	       wm_window,
+			       atom,
+			       0, G_MAXLONG,
+			       False, utf8_string,
+			       &type, &format, &nitems,
+			       &bytes_after, (guchar **) &val);
+
+  if (gdk_error_trap_pop () || result != Success ||
+      type != utf8_string || format != 8 || nitems == 0 ||
+      !g_utf8_validate (val, nitems, NULL))
+    {
+      retval = NULL;
+    }
+  else
+    {
+      retval = g_strndup (val, nitems);
+    }
+
+  if (val)
+    XFree (val);
+
+  return retval;
+}
+
+char*
+wm_common_get_current_window_manager (void)
+{
+  Atom atom = gdk_x11_get_xatom_by_name ("_NET_WM_NAME");
+  char *result;
+
+  result = wm_common_get_window_manager_property (atom);
+  if (result)
+    return result;
+  else
+    return g_strdup (WM_COMMON_UNKNOWN);
+}
+
+static void
+update_wm_window (void)
+{
+  Window *xwindow;
+  Atom type;
+  gint format;
+  gulong nitems;
+  gulong bytes_after;
+
+  XGetWindowProperty (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()), GDK_ROOT_WINDOW (),
+		      gdk_x11_get_xatom_by_name ("_NET_SUPPORTING_WM_CHECK"),
+		      0, G_MAXLONG, False, XA_WINDOW, &type, &format,
+		      &nitems, &bytes_after, (guchar **) &xwindow);
+
+  if (type != XA_WINDOW)
+    {
+      wm_window = None;
+     return;
+    }
+
+  gdk_error_trap_push ();
+  XSelectInput (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()), *xwindow, StructureNotifyMask | PropertyChangeMask);
+  XSync (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()), False);
+
+  if (gdk_error_trap_pop ())
+    {
+       XFree (xwindow);
+       wm_window = None;
+       return;
+    }
+
+    wm_window = *xwindow;
+    XFree (xwindow);
+}
+
+void
+wm_common_update_window ()
+{
+  update_wm_window();
+}