Dogcows Code - chaz/openbox/blob - openbox/grab.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    grab.c for the Openbox window manager
   4    Copyright (c) 2003        Ben Jansens
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    See the COPYING file for a copy of the GNU General Public License.
  17 */
  18
  19 #include "grab.h"
  20 #include "openbox.h"
  21 #include "event.h"
  22 #include "xerror.h"
  23 #include "screen.h"
  24
  25 #include <glib.h>
  26 #include <X11/Xlib.h>
  27
  28 #define GRAB_PTR_MASK (ButtonPressMask | ButtonReleaseMask | PointerMotionMask)
  29 #define GRAB_KEY_MASK (KeyPressMask | KeyReleaseMask)
  30
  31 #define MASK_LIST_SIZE 8
  32
  33 /*! A list of all possible combinations of keyboard lock masks */
  34 static unsigned int mask_list[MASK_LIST_SIZE];
  35 static guint kgrabs = 0;
  36 static guint pgrabs = 0;
  37
  38 gboolean grab_on_keyboard()
  39 {
  40     return kgrabs > 0;
  41 }
  42
  43 gboolean grab_on_pointer()
  44 {
  45     return pgrabs > 0;
  46 }
  47
  48 gboolean grab_keyboard(gboolean grab)
  49 {
  50     gboolean ret = FALSE;
  51
  52     if (grab) {
  53         if (kgrabs++ == 0)
  54             ret = XGrabKeyboard(ob_display, RootWindow(ob_display, ob_screen),
  55                                 FALSE, GrabModeAsync, GrabModeAsync,
  56                                 event_lasttime) == Success;
  57         else
  58             ret = TRUE;
  59     } else if (kgrabs > 0) {
  60         if (--kgrabs == 0)
  61             XUngrabKeyboard(ob_display, event_lasttime);
  62         ret = TRUE;
  63     }
  64
  65     return ret;
  66 }
  67
  68 gboolean grab_pointer(gboolean grab, ObCursor cur)
  69 {
  70     gboolean ret = FALSE;
  71
  72     if (grab) {
  73         if (pgrabs++ == 0)
  74             ret = XGrabPointer(ob_display, screen_support_win,
  75                                False, GRAB_PTR_MASK, GrabModeAsync,
  76                                GrabModeAsync, FALSE,
  77                                ob_cursor(cur), event_lasttime) == Success;
  78         else
  79             ret = TRUE;
  80     } else if (pgrabs > 0) {
  81         if (--pgrabs == 0) {
  82             XUngrabPointer(ob_display, event_lasttime);
  83
  84             /* ignore all enter events caused by ungrabbing the pointer */
  85             {
  86                 GSList *saved = NULL, *it;
  87                 XEvent *e;
  88                 guint n = 0;
  89
  90                 XSync(ob_display, FALSE);
  91
  92                 /* count the events */
  93                 while (TRUE) {
  94                     e = g_new(XEvent, 1);
  95                     if (XCheckTypedEvent(ob_display, EnterNotify, e)) {
  96                         saved = g_slist_append(saved, e);
  97                         ++n;
  98                     } else {
  99                         g_free(e);
 100                         break;
 101                     }
 102                 }
 103                 /* put the events back */
 104                 for (it = saved; it; it = g_slist_next(it)) {
 105                     XPutBackEvent(ob_display, it->data);
 106                     g_free(it->data);
 107                 }
 108                 g_slist_free(saved);
 109                 /* ignore the events */
 110                 event_ignore_enter_focus(n);
 111             }
 112         }
 113         ret = TRUE;
 114     }
 115     return ret;
 116 }
 117
 118 gboolean grab_pointer_window(gboolean grab, ObCursor cur, Window win)
 119 {
 120     gboolean ret = FALSE;
 121
 122     if (grab) {
 123         if (pgrabs++ == 0)
 124             ret = XGrabPointer(ob_display, win, False, GRAB_PTR_MASK,
 125                                GrabModeAsync, GrabModeAsync, TRUE,
 126                                ob_cursor(cur),
 127                                event_lasttime) == Success;
 128         else
 129             ret = TRUE;
 130     } else if (pgrabs > 0) {
 131         if (--pgrabs == 0)
 132             XUngrabPointer(ob_display, event_lasttime);
 133         ret = TRUE;
 134     }
 135     return ret;
 136 }
 137
 138 gint grab_server(gboolean grab)
 139 {
 140     static guint sgrabs = 0;
 141     if (grab) {
 142         if (sgrabs++ == 0) {
 143             XGrabServer(ob_display);
 144             XSync(ob_display, FALSE);
 145         }
 146     } else if (sgrabs > 0) {
 147         if (--sgrabs == 0) {
 148             XUngrabServer(ob_display);
 149             XFlush(ob_display);
 150         }
 151     }
 152     return sgrabs;
 153 }
 154
 155 void grab_startup(gboolean reconfig)
 156 {
 157     guint i = 0;
 158
 159     if (reconfig) return;
 160
 161     mask_list[i++] = 0;
 162     mask_list[i++] = LockMask;
 163     mask_list[i++] = NumLockMask;
 164     mask_list[i++] = LockMask | NumLockMask;
 165     mask_list[i++] = ScrollLockMask;
 166     mask_list[i++] = ScrollLockMask | LockMask;
 167     mask_list[i++] = ScrollLockMask | NumLockMask;
 168     mask_list[i++] = ScrollLockMask | LockMask | NumLockMask;
 169     g_assert(i == MASK_LIST_SIZE);
 170 }
 171
 172 void grab_shutdown(gboolean reconfig)
 173 {
 174     if (reconfig) return;
 175
 176     while (grab_keyboard(FALSE));
 177     while (grab_pointer(FALSE, OB_CURSOR_NONE));
 178     while (grab_pointer_window(FALSE, OB_CURSOR_NONE, None));
 179     while (grab_server(FALSE));
 180 }
 181
 182 void grab_button_full(guint button, guint state, Window win, guint mask,
 183                       int pointer_mode, ObCursor cur)
 184 {
 185     guint i;
 186
 187     xerror_set_ignore(TRUE); /* can get BadAccess' from these */
 188     xerror_occured = FALSE;
 189     for (i = 0; i < MASK_LIST_SIZE; ++i)
 190         XGrabButton(ob_display, button, state | mask_list[i], win, FALSE, mask,
 191                     pointer_mode, GrabModeSync, None, ob_cursor(cur));
 192     xerror_set_ignore(FALSE);
 193     if (xerror_occured)
 194         g_warning("failed to grab button %d modifiers %d", button, state);
 195 }
 196
 197 void grab_button(guint button, guint state, Window win, guint mask)
 198 {
 199     grab_button_full(button, state, win, mask, GrabModeAsync, OB_CURSOR_NONE);
 200 }
 201
 202 void ungrab_button(guint button, guint state, Window win)
 203 {
 204     guint i;
 205
 206     for (i = 0; i < MASK_LIST_SIZE; ++i)
 207         XUngrabButton(ob_display, button, state | mask_list[i], win);
 208 }
 209
 210 void grab_key(guint keycode, guint state, Window win, int keyboard_mode)
 211 {
 212     guint i;
 213
 214     xerror_set_ignore(TRUE); /* can get BadAccess' from these */
 215     xerror_occured = FALSE;
 216     for (i = 0; i < MASK_LIST_SIZE; ++i)
 217         XGrabKey(ob_display, keycode, state | mask_list[i], win, FALSE,
 218                  GrabModeAsync, keyboard_mode);
 219     xerror_set_ignore(FALSE);
 220     if (xerror_occured)
 221         g_warning("failed to grab keycode %d modifiers %d", keycode, state);
 222 }
 223
 224 void ungrab_all_keys(Window win)
 225 {
 226     XUngrabKey(ob_display, AnyKey, AnyModifier, win);
 227 }