Merge pull request #3 from haxar/master

gsd to msd complete rename patch by NiceandGently

1 files changed, 246 insertions, 0 deletions

diff --git a/plugins/common/msd-keygrab.c b/plugins/common/msd-keygrab.c
new file mode 100644
index 0000000..7a16f4e
--- /dev/null
+++ b/plugins/common/msd-keygrab.c
@@ -0,0 +1,246 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2001-2003 Bastien Nocera <[email protected]>
+ * Copyright (C) 2006-2007 William Jon McCann <[email protected]>
+ * Copyright (C) 2008 Jens Granseuer <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include "config.h"
+
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+#ifdef HAVE_X11_EXTENSIONS_XKB_H
+#include <X11/XKBlib.h>
+#include <X11/extensions/XKB.h>
+#include <gdk/gdkkeysyms.h>
+#endif
+
+#include "eggaccelerators.h"
+
+#include "msd-keygrab.h"
+
+/* these are the mods whose combinations are ignored by the keygrabbing code */
+static GdkModifierType msd_ignored_mods = 0;
+
+/* these are the ones we actually use for global keys, we always only check
+ * for these set */
+static GdkModifierType msd_used_mods = 0;
+
+static void
+setup_modifiers (void)
+{
+        if (msd_used_mods == 0 || msd_ignored_mods == 0) {
+                GdkModifierType dynmods;
+
+                /* default modifiers */
+                msd_ignored_mods = \
+                        0x2000 /*Xkb modifier*/ | GDK_LOCK_MASK | GDK_HYPER_MASK;
+		msd_used_mods = \
+                        GDK_SHIFT_MASK | GDK_CONTROL_MASK |\
+                        GDK_MOD1_MASK | GDK_MOD2_MASK | GDK_MOD3_MASK | GDK_MOD4_MASK |\
+                        GDK_MOD5_MASK | GDK_SUPER_MASK | GDK_META_MASK;
+
+                /* NumLock can be assigned to varying keys so we need to
+                 * resolve and ignore it specially */
+                dynmods = 0;
+                egg_keymap_resolve_virtual_modifiers (gdk_keymap_get_default (),
+                                                      EGG_VIRTUAL_NUM_LOCK_MASK,
+                                                      &dynmods);
+
+                msd_ignored_mods |= dynmods;
+                msd_used_mods &= ~dynmods;
+	}
+}
+
+static void
+grab_key_real (guint      keycode,
+               GdkWindow *root,
+               gboolean   grab,
+               int        mask)
+{
+        if (grab) {
+                XGrabKey (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
+                          keycode,
+                          mask,
+                          GDK_WINDOW_XID (root),
+                          True,
+                          GrabModeAsync,
+                          GrabModeAsync);
+        } else {
+                XUngrabKey (GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
+                            keycode,
+                            mask,
+                            GDK_WINDOW_XID (root));
+        }
+}
+
+/* Grab the key. In order to ignore MSD_IGNORED_MODS we need to grab
+ * all combinations of the ignored modifiers and those actually used
+ * for the binding (if any).
+ *
+ * inspired by all_combinations from mate-panel/mate-panel/global-keys.c
+ *
+ * This may generate X errors.  The correct way to use this is like:
+ *
+ *        gdk_error_trap_push ();
+ *
+ *        grab_key_unsafe (key, grab, screens);
+ *
+ *        gdk_flush ();
+ *        if (gdk_error_trap_pop ())
+ *                g_warning ("Grab failed, another application may already have access to key '%u'",
+ *                           key->keycode);
+ *
+ * This is not done in the function itself, to allow doing multiple grab_key
+ * operations with one flush only.
+ */
+#define N_BITS 32
+void
+grab_key_unsafe (Key                 *key,
+                 gboolean             grab,
+                 GSList              *screens)
+{
+        int   indexes[N_BITS]; /* indexes of bits we need to flip */
+        int   i;
+        int   bit;
+        int   bits_set_cnt;
+        int   uppervalue;
+        guint mask;
+
+        setup_modifiers ();
+
+        mask = msd_ignored_mods & ~key->state & GDK_MODIFIER_MASK;
+
+        bit = 0;
+        /* store the indexes of all set bits in mask in the array */
+        for (i = 0; mask; ++i, mask >>= 1) {
+                if (mask & 0x1) {
+                        indexes[bit++] = i;
+                }
+        }
+
+        bits_set_cnt = bit;
+
+        uppervalue = 1 << bits_set_cnt;
+        /* grab all possible modifier combinations for our mask */
+        for (i = 0; i < uppervalue; ++i) {
+                GSList *l;
+                int     j;
+                int     result = 0;
+
+                /* map bits in the counter to those in the mask */
+                for (j = 0; j < bits_set_cnt; ++j) {
+                        if (i & (1 << j)) {
+                                result |= (1 << indexes[j]);
+                        }
+                }
+
+                for (l = screens; l; l = l->next) {
+                        GdkScreen *screen = l->data;
+                        guint *code;
+
+                        for (code = key->keycodes; *code; ++code) {
+                                grab_key_real (*code,
+                                               gdk_screen_get_root_window (screen),
+                                               grab,
+                                               result | key->state);
+                        }
+                }
+        }
+}
+
+static gboolean
+have_xkb (Display *dpy)
+{
+	static int have_xkb = -1;
+
+	if (have_xkb == -1) {
+#ifdef HAVE_X11_EXTENSIONS_XKB_H
+		int opcode, error_base, major, minor, xkb_event_base;
+
+		have_xkb = XkbQueryExtension (dpy,
+					      &opcode,
+					      &xkb_event_base,
+					      &error_base,
+					      &major,
+					      &minor)
+			&& XkbUseExtension (dpy, &major, &minor);
+#else
+		have_xkb = 0;
+#endif
+	}
+
+	return have_xkb;
+}
+
+gboolean
+key_uses_keycode (const Key *key, guint keycode)
+{
+	if (key->keycodes != NULL) {
+		guint *c;
+
+		for (c = key->keycodes; *c; ++c) {
+			if (*c == keycode)
+				return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+gboolean
+match_key (Key *key, XEvent *event)
+{
+	guint keyval;
+	GdkModifierType consumed;
+	gint group;
+
+	if (key == NULL)
+		return FALSE;
+
+	setup_modifiers ();
+
+#ifdef HAVE_X11_EXTENSIONS_XKB_H
+	if (have_xkb (event->xkey.display))
+		group = XkbGroupForCoreState (event->xkey.state);
+	else
+#endif
+		group = (event->xkey.state & GDK_Mode_switch) ? 1 : 0;
+
+	/* Check if we find a keysym that matches our current state */
+	if (gdk_keymap_translate_keyboard_state (NULL, event->xkey.keycode,
+					     event->xkey.state, group,
+					     &keyval, NULL, NULL, &consumed)) {
+		guint lower, upper;
+
+		gdk_keyval_convert_case (keyval, &lower, &upper);
+
+		/* If we are checking against the lower version of the
+		 * keysym, we might need the Shift state for matching,
+		 * so remove it from the consumed modifiers */
+		if (lower == key->keysym)
+			consumed &= ~GDK_SHIFT_MASK;
+
+		return ((lower == key->keysym || upper == key->keysym)
+			&& (event->xkey.state & ~consumed & msd_used_mods) == key->state);
+	}
+
+	/* The key we passed doesn't have a keysym, so try with just the keycode */
+        return (key != NULL
+                && key->state == (event->xkey.state & msd_used_mods)
+                && key_uses_keycode (key, event->xkey.keycode));
+}