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 gint grab_server(gboolean grab)
 118 {
 119     static guint sgrabs = 0;
 120     if (grab) {
 121         if (sgrabs++ == 0) {
 122             XGrabServer(ob_display);
 123             XSync(ob_display, FALSE);
 124         }
 125     } else if (sgrabs > 0) {
 126         if (--sgrabs == 0) {
 127             XUngrabServer(ob_display);
 128             XFlush(ob_display);
 129         }
 130     }
 131     return sgrabs;
 132 }
 133
 134 void grab_startup(gboolean reconfig)
 135 {
 136     guint i = 0;
 137
 138     if (reconfig) return;
 139
 140     mask_list[i++] = 0;
 141     mask_list[i++] = LockMask;
 142     mask_list[i++] = NumLockMask;
 143     mask_list[i++] = LockMask | NumLockMask;
 144     mask_list[i++] = ScrollLockMask;
 145     mask_list[i++] = ScrollLockMask | LockMask;
 146     mask_list[i++] = ScrollLockMask | NumLockMask;
 147     mask_list[i++] = ScrollLockMask | LockMask | NumLockMask;
 148     g_assert(i == MASK_LIST_SIZE);
 149 }
 150
 151 void grab_shutdown(gboolean reconfig)
 152 {
 153     if (reconfig) return;
 154
 155     while (grab_keyboard(FALSE));
 156     while (grab_pointer(FALSE, FALSE, OB_CURSOR_NONE));
 157     while (grab_server(FALSE));
 158 }
 159
 160 void grab_button_full(guint button, guint state, Window win, guint mask,
 161                       gint pointer_mode, ObCursor cur)
 162 {
 163     guint i;
 164
 165     xerror_set_ignore(TRUE); /* can get BadAccess' from these */
 166     xerror_occured = FALSE;
 167     for (i = 0; i < MASK_LIST_SIZE; ++i)
 168         XGrabButton(ob_display, button, state | mask_list[i], win, FALSE, mask,
 169                     pointer_mode, GrabModeSync, None, ob_cursor(cur));
 170     xerror_set_ignore(FALSE);
 171     if (xerror_occured)
 172         g_warning("failed to grab button %d modifiers %d", button, state);
 173 }
 174
 175 void grab_button(guint button, guint state, Window win, guint mask)
 176 {
 177     grab_button_full(button, state, win, mask, GrabModeAsync, OB_CURSOR_NONE);
 178 }
 179
 180 void ungrab_button(guint button, guint state, Window win)
 181 {
 182     guint i;
 183
 184     for (i = 0; i < MASK_LIST_SIZE; ++i)
 185         XUngrabButton(ob_display, button, state | mask_list[i], win);
 186 }
 187
 188 void grab_key(guint keycode, guint state, Window win, gint keyboard_mode)
 189 {
 190     guint i;
 191
 192     xerror_set_ignore(TRUE); /* can get BadAccess' from these */
 193     xerror_occured = FALSE;
 194     for (i = 0; i < MASK_LIST_SIZE; ++i)
 195         XGrabKey(ob_display, keycode, state | mask_list[i], win, FALSE,
 196                  GrabModeAsync, keyboard_mode);
 197     xerror_set_ignore(FALSE);
 198     if (xerror_occured)
 199         g_warning("failed to grab keycode %d modifiers %d", keycode, state);
 200 }
 201
 202 void ungrab_all_keys(Window win)
 203 {
 204     XUngrabKey(ob_display, AnyKey, AnyModifier, win);
 205 }