c1a2b46553
2007-05-23 Jens Granseuer <jensgr@gmx.net> * wm-common.c: (wm_common_get_current_window_manager): make sure we always return a copy of the window manager name, not a static string (fixes bug #439244) svn path=/trunk/; revision=7650
142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
#include <X11/Xatom.h>
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#include <gdk/gdkx.h>
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#include <gdk/gdk.h>
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#include <string.h>
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#include <glib.h>
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#include <glib-object.h>
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#include "wm-common.h"
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typedef struct _WMCallbackData
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{
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GFunc func;
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gpointer data;
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} WMCallbackData;
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/* Our WM Window */
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static Window wm_window = None;
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char*
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wm_common_get_current_window_manager (void)
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{
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Atom utf8_string, atom, type;
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int result;
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char *retval;
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int format;
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gulong nitems;
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gulong bytes_after;
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guchar *val;
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if (wm_window == None)
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return g_strdup (WM_COMMON_UNKNOWN);
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utf8_string = XInternAtom (GDK_DISPLAY (), "UTF8_STRING", False);
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atom = XInternAtom (GDK_DISPLAY (), "_NET_WM_NAME", False);
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gdk_error_trap_push ();
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val = NULL;
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result = XGetWindowProperty (GDK_DISPLAY (),
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wm_window,
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atom,
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0, G_MAXLONG,
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False, utf8_string,
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&type, &format, &nitems,
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&bytes_after, &val);
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if (gdk_error_trap_pop () || result != Success ||
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type != utf8_string || format != 8 || nitems == 0 ||
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!g_utf8_validate (val, nitems, NULL))
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{
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retval = g_strdup (WM_COMMON_UNKNOWN);
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}
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else
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{
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retval = g_strndup (val, nitems);
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}
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if (val)
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XFree (val);
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return retval;
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}
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static void
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update_wm_window (void)
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{
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Window *xwindow;
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Atom type;
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gint format;
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gulong nitems;
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gulong bytes_after;
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XGetWindowProperty (GDK_DISPLAY (), GDK_ROOT_WINDOW (),
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XInternAtom (GDK_DISPLAY (), "_NET_SUPPORTING_WM_CHECK", False),
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0, G_MAXLONG, False, XA_WINDOW, &type, &format,
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&nitems, &bytes_after, (guchar **) &xwindow);
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if (type != XA_WINDOW)
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{
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wm_window = None;
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return;
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}
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gdk_error_trap_push ();
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XSelectInput (GDK_DISPLAY (), *xwindow, StructureNotifyMask | PropertyChangeMask);
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XSync (GDK_DISPLAY (), False);
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if (gdk_error_trap_pop ())
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{
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XFree (xwindow);
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wm_window = None;
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return;
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}
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wm_window = *xwindow;
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XFree (xwindow);
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}
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static GdkFilterReturn
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wm_window_event_filter (GdkXEvent *xev,
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GdkEvent *event,
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gpointer data)
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{
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WMCallbackData *ncb_data = (WMCallbackData*) data;
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XEvent *xevent = (XEvent *)xev;
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if ((xevent->type == DestroyNotify &&
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wm_window != None && xevent->xany.window == wm_window) ||
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(xevent->type == PropertyNotify &&
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xevent->xany.window == GDK_ROOT_WINDOW () &&
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xevent->xproperty.atom == (XInternAtom (GDK_DISPLAY (), "_NET_SUPPORTING_WM_CHECK", False))) ||
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(xevent->type == PropertyNotify &&
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wm_window != None && xevent->xany.window == wm_window &&
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xevent->xproperty.atom == (XInternAtom (GDK_DISPLAY (), "_NET_WM_NAME", False))))
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{
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update_wm_window ();
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(* ncb_data->func) ((gpointer)wm_common_get_current_window_manager(),
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ncb_data->data);
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}
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return GDK_FILTER_CONTINUE;
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}
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void
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wm_common_register_window_manager_change (GFunc func,
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gpointer data)
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{
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WMCallbackData *ncb_data;
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ncb_data = g_new0 (WMCallbackData, 1);
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ncb_data->func = func;
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ncb_data->data = data;
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gdk_window_add_filter (NULL, wm_window_event_filter, ncb_data);
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update_wm_window ();
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XSelectInput (GDK_DISPLAY (), GDK_ROOT_WINDOW (), PropertyChangeMask);
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XSync (GDK_DISPLAY (), False);
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}
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