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) 2006        Mikael Magnusson
   5    Copyright (c) 2003        Ben 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 "xerror.h"
  24 #include "screen.h"
  25
  26 #include <glib.h>
  27 #include <X11/Xlib.h>
  28
  29 #define GRAB_PTR_MASK (ButtonPressMask | ButtonReleaseMask | PointerMotionMask)
  30 #define GRAB_KEY_MASK (KeyPressMask | KeyReleaseMask)
  31
  32 #define MASK_LIST_SIZE 8
  33
  34 /*! A list of all possible combinations of keyboard lock masks */
  35 static guint mask_list[MASK_LIST_SIZE];
  36 static guint kgrabs = 0;
  37 static guint pgrabs = 0;
  38 /*! The time at which the last grab was made */
  39 static Time  grab_time = CurrentTime;
  40
  41 static Time ungrab_time()
  42 {
  43     Time t = event_curtime;
  44     if (!(t == CurrentTime || event_time_after(t, grab_time)))
  45         /* When the time moves backward on the server, then we can't use
  46            the grab time because that will be in the future. So instead we
  47            have to use CurrentTime.
  48
  49            "XUngrabPointer does not release the pointer if the specified time
  50            is earlier than the last-pointer-grab time or is later than the
  51            current X server time."
  52         */
  53         t = CurrentTime; /*grab_time;*/
  54     return t;
  55 }
  56
  57 gboolean grab_on_keyboard()
  58 {
  59     return kgrabs > 0;
  60 }
  61
  62 gboolean grab_on_pointer()
  63 {
  64     return pgrabs > 0;
  65 }
  66
  67 gboolean grab_keyboard(gboolean grab)
  68 {
  69     gboolean ret = FALSE;
  70
  71     if (grab) {
  72         if (kgrabs++ == 0) {
  73             ret = XGrabKeyboard(ob_display, RootWindow(ob_display, ob_screen),
  74                                 False, GrabModeAsync, GrabModeAsync,
  75                                 event_curtime) == Success;
  76             if (!ret)
  77                 --kgrabs;
  78             else
  79                 grab_time = event_curtime;
  80         } else
  81             ret = TRUE;
  82     } else if (kgrabs > 0) {
  83         if (--kgrabs == 0) {
  84             XUngrabKeyboard(ob_display, ungrab_time());
  85         }
  86         ret = TRUE;
  87     }
  88
  89     return ret;
  90 }
  91
  92 gboolean grab_pointer(gboolean grab, gboolean owner_events, ObCursor cur)
  93 {
  94     gboolean ret = FALSE;
  95
  96     if (grab) {
  97         if (pgrabs++ == 0) {
  98             ret = XGrabPointer(ob_display, screen_support_win, owner_events,
  99                                GRAB_PTR_MASK,
 100                                GrabModeAsync, GrabModeAsync, None,
 101                                ob_cursor(cur), event_curtime) == Success;
 102             if (!ret)
 103                 --pgrabs;
 104             else
 105                 grab_time = event_curtime;
 106         } else
 107             ret = TRUE;
 108     } else if (pgrabs > 0) {
 109         if (--pgrabs == 0) {
 110             XUngrabPointer(ob_display, ungrab_time());
 111         }
 112         ret = TRUE;
 113     }
 114     return ret;
 115 }
 116
 117 gboolean grab_pointer_window(gboolean grab, gboolean owner_events,
 118                              ObCursor cur, Window win)
 119 {
 120     gboolean ret = FALSE;
 121
 122     if (grab) {
 123         if (pgrabs++ == 0) {
 124             ret = XGrabPointer(ob_display, win, owner_events,
 125                                GRAB_PTR_MASK,
 126                                GrabModeAsync, GrabModeAsync, None,
 127                                ob_cursor(cur),
 128                                event_curtime) == Success;
 129             if (!ret)
 130                 --pgrabs;
 131             else
 132                 grab_time = event_curtime;
 133         } else
 134             ret = TRUE;
 135     } else if (pgrabs > 0) {
 136         if (--pgrabs == 0) {
 137             XUngrabPointer(ob_display, ungrab_time());
 138         }
 139         ret = TRUE;
 140     }
 141     return ret;
 142 }
 143
 144 gint grab_server(gboolean grab)
 145 {
 146     static guint sgrabs = 0;
 147     if (grab) {
 148         if (sgrabs++ == 0) {
 149             XGrabServer(ob_display);
 150             XSync(ob_display, FALSE);
 151         }
 152     } else if (sgrabs > 0) {
 153         if (--sgrabs == 0) {
 154             XUngrabServer(ob_display);
 155             XFlush(ob_display);
 156         }
 157     }
 158     return sgrabs;
 159 }
 160
 161 void grab_startup(gboolean reconfig)
 162 {
 163     guint i = 0;
 164
 165     if (reconfig) return;
 166
 167     mask_list[i++] = 0;
 168     mask_list[i++] = LockMask;
 169     mask_list[i++] = NumLockMask;
 170     mask_list[i++] = LockMask | NumLockMask;
 171     mask_list[i++] = ScrollLockMask;
 172     mask_list[i++] = ScrollLockMask | LockMask;
 173     mask_list[i++] = ScrollLockMask | NumLockMask;
 174     mask_list[i++] = ScrollLockMask | LockMask | NumLockMask;
 175     g_assert(i == MASK_LIST_SIZE);
 176 }
 177
 178 void grab_shutdown(gboolean reconfig)
 179 {
 180     if (reconfig) return;
 181
 182     while (grab_keyboard(FALSE));
 183     while (grab_pointer(FALSE, FALSE, OB_CURSOR_NONE));
 184     while (grab_pointer_window(FALSE, FALSE, OB_CURSOR_NONE, None));
 185     while (grab_server(FALSE));
 186 }
 187
 188 void grab_button_full(guint button, guint state, Window win, guint mask,
 189                       gint pointer_mode, ObCursor cur)
 190 {
 191     guint i;
 192
 193     xerror_set_ignore(TRUE); /* can get BadAccess' from these */
 194     xerror_occured = FALSE;
 195     for (i = 0; i < MASK_LIST_SIZE; ++i)
 196         XGrabButton(ob_display, button, state | mask_list[i], win, FALSE, mask,
 197                     pointer_mode, GrabModeSync, None, ob_cursor(cur));
 198     xerror_set_ignore(FALSE);
 199     if (xerror_occured)
 200         g_warning("failed to grab button %d modifiers %d", button, state);
 201 }
 202
 203 void grab_button(guint button, guint state, Window win, guint mask)
 204 {
 205     grab_button_full(button, state, win, mask, GrabModeAsync, OB_CURSOR_NONE);
 206 }
 207
 208 void ungrab_button(guint button, guint state, Window win)
 209 {
 210     guint i;
 211
 212     for (i = 0; i < MASK_LIST_SIZE; ++i)
 213         XUngrabButton(ob_display, button, state | mask_list[i], win);
 214 }
 215
 216 void grab_key(guint keycode, guint state, Window win, gint keyboard_mode)
 217 {
 218     guint i;
 219
 220     xerror_set_ignore(TRUE); /* can get BadAccess' from these */
 221     xerror_occured = FALSE;
 222     for (i = 0; i < MASK_LIST_SIZE; ++i)
 223         XGrabKey(ob_display, keycode, state | mask_list[i], win, FALSE,
 224                  GrabModeAsync, keyboard_mode);
 225     xerror_set_ignore(FALSE);
 226     if (xerror_occured)
 227         g_warning("failed to grab keycode %d modifiers %d", keycode, state);
 228 }
 229
 230 void ungrab_all_keys(Window win)
 231 {
 232     XUngrabKey(ob_display, AnyKey, AnyModifier, win);
 233 }