From 0b0e6bc987da4fd88a7854ebb12bde705e92c428 Mon Sep 17 00:00:00 2001
From: Perberos <perberos@gmail.com>
Date: Thu, 1 Dec 2011 21:51:44 -0300
Subject: moving from https://github.com/perberos/mate-desktop-environment

---
 capplets/common/wm-common.c | 184 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 capplets/common/wm-common.c

(limited to 'capplets/common/wm-common.c')

diff --git a/capplets/common/wm-common.c b/capplets/common/wm-common.c
new file mode 100644
index 00000000..31cd503d
--- /dev/null
+++ b/capplets/common/wm-common.c
@@ -0,0 +1,184 @@
+#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"
+
+typedef struct _WMCallbackData
+{
+  GFunc func;
+  gpointer data;
+} WMCallbackData;
+
+/* 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 = XInternAtom (GDK_DISPLAY (), "UTF8_STRING", False);
+
+  gdk_error_trap_push ();
+
+  val = NULL;
+  result = XGetWindowProperty (GDK_DISPLAY (),
+		  	       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 = XInternAtom (GDK_DISPLAY (), "_NET_WM_NAME", False);
+  char *result;
+
+  result = wm_common_get_window_manager_property (atom);
+  if (result)
+    return result;
+  else
+    return g_strdup (WM_COMMON_UNKNOWN);
+}
+
+char**
+wm_common_get_current_keybindings (void)
+{
+  Atom keybindings_atom = XInternAtom (GDK_DISPLAY (), "_MATE_WM_KEYBINDINGS", False);
+  char *keybindings = wm_common_get_window_manager_property (keybindings_atom);
+  char **results;
+
+  if (keybindings)
+    {
+      char **p;
+      results = g_strsplit(keybindings, ",", -1);
+      for (p = results; *p; p++)
+	g_strstrip (*p);
+      g_free (keybindings);
+    }
+  else
+    {
+      Atom wm_atom = XInternAtom (GDK_DISPLAY (), "_NET_WM_NAME", False);
+      char *wm_name = wm_common_get_window_manager_property (wm_atom);
+      char *to_copy[] = { NULL, NULL };
+
+      to_copy[0] = wm_name ? wm_name : WM_COMMON_UNKNOWN;
+
+      results = g_strdupv (to_copy);
+      g_free (wm_name);
+    }
+
+  return results;
+}
+
+static void
+update_wm_window (void)
+{
+  Window *xwindow;
+  Atom type;
+  gint format;
+  gulong nitems;
+  gulong bytes_after;
+
+  XGetWindowProperty (GDK_DISPLAY (), GDK_ROOT_WINDOW (),
+		      XInternAtom (GDK_DISPLAY (), "_NET_SUPPORTING_WM_CHECK", False),
+		      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 (), *xwindow, StructureNotifyMask | PropertyChangeMask);
+  XSync (GDK_DISPLAY (), False);
+
+  if (gdk_error_trap_pop ())
+    {
+       XFree (xwindow);
+       wm_window = None;
+       return;
+    }
+
+    wm_window = *xwindow;
+    XFree (xwindow);
+}
+
+static GdkFilterReturn
+wm_window_event_filter (GdkXEvent *xev,
+			GdkEvent  *event,
+			gpointer   data)
+{
+  WMCallbackData *ncb_data = (WMCallbackData*) data;
+  XEvent *xevent = (XEvent *)xev;
+
+  if ((xevent->type == DestroyNotify &&
+       wm_window != None && xevent->xany.window == wm_window) ||
+      (xevent->type == PropertyNotify &&
+       xevent->xany.window == GDK_ROOT_WINDOW () &&
+       xevent->xproperty.atom == (XInternAtom (GDK_DISPLAY (),  "_NET_SUPPORTING_WM_CHECK", False))) ||
+      (xevent->type == PropertyNotify &&
+       wm_window != None && xevent->xany.window == wm_window &&
+       xevent->xproperty.atom == (XInternAtom (GDK_DISPLAY (), "_NET_WM_NAME", False))))
+    {
+      update_wm_window ();
+      (* ncb_data->func) ((gpointer)wm_common_get_current_window_manager(),
+		   	  ncb_data->data);
+    }
+
+  return GDK_FILTER_CONTINUE;
+}
+
+void
+wm_common_register_window_manager_change (GFunc    func,
+					  gpointer data)
+{
+  WMCallbackData *ncb_data;
+
+  ncb_data = g_new0 (WMCallbackData, 1);
+
+  ncb_data->func = func;
+  ncb_data->data = data;
+
+  gdk_window_add_filter (NULL, wm_window_event_filter, ncb_data);
+
+  update_wm_window ();
+
+  XSelectInput (GDK_DISPLAY (), GDK_ROOT_WINDOW (), PropertyChangeMask);
+  XSync (GDK_DISPLAY (), False);
+}
+
+
-- 
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