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) 2006        Mikael Magnusson
   5    Copyright (c) 2003-2007   Dana Jansens
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "grab.h"
  21 #include "openbox.h"
  22 #include "event.h"
  23 #include "screen.h"
  24 #include "debug.h"
  25 #include "obt/display.h"
  26 #include "obt/keyboard.h"
  27
  28 #include <glib.h>
  29 #include <X11/Xlib.h>
  30
  31 #define GRAB_PTR_MASK (ButtonPressMask | ButtonReleaseMask | PointerMotionMask)
  32 #define GRAB_KEY_MASK (KeyPressMask | KeyReleaseMask)
  33
  34 #define MASK_LIST_SIZE 8
  35
  36 /*! A list of all possible combinations of keyboard lock masks */
  37 static guint mask_list[MASK_LIST_SIZE];
  38 static guint kgrabs = 0;
  39 static guint pgrabs = 0;
  40 /*! The time at which the last grab was made */
  41 static Time  grab_time = CurrentTime;
  42 static gint passive_count = 0;
  43 static ObtIC *ic = NULL;
  44
  45 static Time ungrab_time(void)
  46 {
  47     Time t = event_time();
  48     if (grab_time == CurrentTime ||
  49         !(t == CurrentTime || event_time_after(t, grab_time)))
  50         /* When the time moves backward on the server, then we can't use
  51            the grab time because that will be in the future. So instead we
  52            have to use CurrentTime.
  53
  54            "XUngrabPointer does not release the pointer if the specified time
  55            is earlier than the last-pointer-grab time or is later than the
  56            current X server time."
  57         */
  58         t = CurrentTime; /*grab_time;*/
  59     return t;
  60 }
  61
  62 static Window grab_window(void)
  63 {
  64     return screen_support_win;
  65 }
  66
  67 gboolean grab_on_keyboard(void)
  68 {
  69     return kgrabs > 0;
  70 }
  71
  72 gboolean grab_on_pointer(void)
  73 {
  74     return pgrabs > 0;
  75 }
  76
  77 ObtIC *grab_input_context(void)
  78 {
  79     return ic;
  80 }
  81
  82 gboolean grab_keyboard_full(gboolean grab)
  83 {
  84     gboolean ret = FALSE;
  85
  86     if (grab) {
  87         if (kgrabs++ == 0) {
  88             ret = XGrabKeyboard(obt_display, grab_window(),
  89                                 False, GrabModeAsync, GrabModeAsync,
  90                                 event_time()) == Success;
  91             if (!ret)
  92                 --kgrabs;
  93             else {
  94                 passive_count = 0;
  95                 grab_time = event_time();
  96             }
  97         } else
  98             ret = TRUE;
  99     } else if (kgrabs > 0) {
 100         if (--kgrabs == 0) {
 101             XUngrabKeyboard(obt_display, ungrab_time());
 102         }
 103         ret = TRUE;
 104     }
 105
 106     return ret;
 107 }
 108
 109 gboolean grab_pointer_full(gboolean grab, gboolean owner_events,
 110                            gboolean confine, ObCursor cur)
 111 {
 112     gboolean ret = FALSE;
 113
 114     if (grab) {
 115         if (pgrabs++ == 0) {
 116             ret = XGrabPointer(obt_display, grab_window(), owner_events,
 117                                GRAB_PTR_MASK,
 118                                GrabModeAsync, GrabModeAsync,
 119                                (confine ? obt_root(ob_screen) : None),
 120                                ob_cursor(cur), event_time()) == Success;
 121             if (!ret)
 122                 --pgrabs;
 123             else
 124                 grab_time = event_time();
 125         } else
 126             ret = TRUE;
 127     } else if (pgrabs > 0) {
 128         if (--pgrabs == 0) {
 129             XUngrabPointer(obt_display, ungrab_time());
 130         }
 131         ret = TRUE;
 132     }
 133     return ret;
 134 }
 135
 136 gint grab_server(gboolean grab)
 137 {
 138     static guint sgrabs = 0;
 139     if (grab) {
 140         if (sgrabs++ == 0) {
 141             XGrabServer(obt_display);
 142             XSync(obt_display, FALSE);
 143         }
 144     } else if (sgrabs > 0) {
 145         if (--sgrabs == 0) {
 146             XUngrabServer(obt_display);
 147             XFlush(obt_display);
 148         }
 149     }
 150     return sgrabs;
 151 }
 152
 153 void grab_startup(gboolean reconfig)
 154 {
 155     guint i = 0;
 156     guint num, caps, scroll;
 157
 158     num = obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_NUMLOCK);
 159     caps = obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_CAPSLOCK);
 160     scroll = obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_SCROLLLOCK);
 161
 162     mask_list[i++] = 0;
 163     mask_list[i++] = num;
 164     mask_list[i++] = caps;
 165     mask_list[i++] = scroll;
 166     mask_list[i++] = num | caps;
 167     mask_list[i++] = num | scroll;
 168     mask_list[i++] = caps | scroll;
 169     mask_list[i++] = num | caps | scroll;
 170     g_assert(i == MASK_LIST_SIZE);
 171
 172     ic = obt_keyboard_context_new(obt_root(ob_screen), grab_window());
 173 }
 174
 175 void grab_shutdown(gboolean reconfig)
 176 {
 177     obt_keyboard_context_unref(ic);
 178     ic = NULL;
 179
 180     if (reconfig) return;
 181
 182     while (ungrab_keyboard());
 183     while (ungrab_pointer());
 184     while (grab_server(FALSE));
 185 }
 186
 187 void grab_button_full(guint button, guint state, Window win, guint mask,
 188                       gint pointer_mode, ObCursor cur)
 189 {
 190     guint i;
 191
 192     /* can get BadAccess from these */
 193     obt_display_ignore_errors(TRUE);
 194     for (i = 0; i < MASK_LIST_SIZE; ++i)
 195         XGrabButton(obt_display, button, state | mask_list[i], win, False,
 196                     mask, pointer_mode, GrabModeAsync, None, ob_cursor(cur));
 197     obt_display_ignore_errors(FALSE);
 198     if (obt_display_error_occured)
 199         ob_debug("Failed to grab button %d modifiers %d", button, state);
 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(obt_display, button, state | mask_list[i], win);
 208 }
 209
 210 void grab_key(guint keycode, guint state, Window win, gint keyboard_mode)
 211 {
 212     guint i;
 213
 214     /* can get BadAccess' from these */
 215     obt_display_ignore_errors(TRUE);
 216     for (i = 0; i < MASK_LIST_SIZE; ++i)
 217         XGrabKey(obt_display, keycode, state | mask_list[i], win, FALSE,
 218                  GrabModeAsync, keyboard_mode);
 219     obt_display_ignore_errors(FALSE);
 220     if (obt_display_error_occured)
 221         ob_debug("Failed to grab keycode %d modifiers %d", keycode, state);
 222 }
 223
 224 void ungrab_all_keys(Window win)
 225 {
 226     XUngrabKey(obt_display, AnyKey, AnyModifier, win);
 227 }
 228
 229 void grab_key_passive_count(int change)
 230 {
 231     if (grab_on_keyboard()) return;
 232     passive_count += change;
 233     if (passive_count < 0) passive_count = 0;
 234 }
 235
 236 void ungrab_passive_key(void)
 237 {
 238     /*ob_debug("ungrabbing %d passive grabs\n", passive_count);*/
 239     if (passive_count) {
 240         /* kill our passive grab */
 241         XUngrabKeyboard(obt_display, event_time());
 242         passive_count = 0;
 243     }
 244 }