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) 2003-2007   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 "modkeys.h"
  22 #include "openbox.h"
  23 #include "event.h"
  24 #include "xerror.h"
  25 #include "screen.h"
  26 #include "debug.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
  43 static Time ungrab_time()
  44 {
  45     Time t = event_curtime;
  46     if (grab_time == CurrentTime ||
  47         !(t == CurrentTime || event_time_after(t, grab_time)))
  48         /* When the time moves backward on the server, then we can't use
  49            the grab time because that will be in the future. So instead we
  50            have to use CurrentTime.
  51
  52            "XUngrabPointer does not release the pointer if the specified time
  53            is earlier than the last-pointer-grab time or is later than the
  54            current X server time."
  55         */
  56         t = CurrentTime; /*grab_time;*/
  57     return t;
  58 }
  59
  60 gboolean grab_on_keyboard()
  61 {
  62     return kgrabs > 0;
  63 }
  64
  65 gboolean grab_on_pointer()
  66 {
  67     return pgrabs > 0;
  68 }
  69
  70 gboolean grab_keyboard_full(gboolean grab)
  71 {
  72     gboolean ret = FALSE;
  73
  74     if (grab) {
  75         if (kgrabs++ == 0) {
  76             ret = XGrabKeyboard(ob_display, RootWindow(ob_display, ob_screen),
  77                                 False, GrabModeAsync, GrabModeAsync,
  78                                 event_curtime) == Success;
  79             if (!ret)
  80                 --kgrabs;
  81             else
  82                 grab_time = event_curtime;
  83         } else
  84             ret = TRUE;
  85     } else if (kgrabs > 0) {
  86         if (--kgrabs == 0) {
  87             XUngrabKeyboard(ob_display, ungrab_time());
  88         }
  89         ret = TRUE;
  90     }
  91
  92     return ret;
  93 }
  94
  95 gboolean grab_pointer_full(gboolean grab, gboolean owner_events,
  96                            gboolean confine, ObCursor cur)
  97 {
  98     gboolean ret = FALSE;
  99
 100     if (grab) {
 101         if (pgrabs++ == 0) {
 102             ret = XGrabPointer(ob_display, screen_support_win, owner_events,
 103                                GRAB_PTR_MASK,
 104                                GrabModeAsync, GrabModeAsync,
 105                                (confine ? RootWindow(ob_display, ob_screen) :
 106                                 None),
 107                                ob_cursor(cur), event_curtime) == Success;
 108             if (!ret)
 109                 --pgrabs;
 110             else
 111                 grab_time = event_curtime;
 112         } else
 113             ret = TRUE;
 114     } else if (pgrabs > 0) {
 115         if (--pgrabs == 0) {
 116             XUngrabPointer(ob_display, ungrab_time());
 117         }
 118         ret = TRUE;
 119     }
 120     return ret;
 121 }
 122
 123 gint grab_server(gboolean grab)
 124 {
 125     static guint sgrabs = 0;
 126     if (grab) {
 127         if (sgrabs++ == 0) {
 128             XGrabServer(ob_display);
 129             XSync(ob_display, FALSE);
 130         }
 131     } else if (sgrabs > 0) {
 132         if (--sgrabs == 0) {
 133             XUngrabServer(ob_display);
 134             XFlush(ob_display);
 135         }
 136     }
 137     return sgrabs;
 138 }
 139
 140 void grab_startup(gboolean reconfig)
 141 {
 142     guint i = 0;
 143     guint num, caps, scroll;
 144
 145     num = modkeys_key_to_mask(OB_MODKEY_KEY_NUMLOCK);
 146     caps = modkeys_key_to_mask(OB_MODKEY_KEY_CAPSLOCK);
 147     scroll = modkeys_key_to_mask(OB_MODKEY_KEY_SCROLLLOCK);
 148
 149     mask_list[i++] = 0;
 150     mask_list[i++] = num;
 151     mask_list[i++] = caps;
 152     mask_list[i++] = scroll;
 153     mask_list[i++] = num | caps;
 154     mask_list[i++] = num | scroll;
 155     mask_list[i++] = caps | scroll;
 156     mask_list[i++] = num | caps | scroll;
 157     g_assert(i == MASK_LIST_SIZE);
 158 }
 159
 160 void grab_shutdown(gboolean reconfig)
 161 {
 162     if (reconfig) return;
 163
 164     while (ungrab_keyboard());
 165     while (ungrab_pointer());
 166     while (grab_server(FALSE));
 167 }
 168
 169 void grab_button_full(guint button, guint state, Window win, guint mask,
 170                       gint pointer_mode, ObCursor cur)
 171 {
 172     guint i;
 173
 174     xerror_set_ignore(TRUE); /* can get BadAccess from these */
 175     xerror_occured = FALSE;
 176     for (i = 0; i < MASK_LIST_SIZE; ++i)
 177         XGrabButton(ob_display, button, state | mask_list[i], win, False, mask,
 178                     pointer_mode, GrabModeAsync, None, ob_cursor(cur));
 179     xerror_set_ignore(FALSE);
 180     if (xerror_occured)
 181         ob_debug("Failed to grab button %d modifiers %d", button, state);
 182 }
 183
 184 void ungrab_button(guint button, guint state, Window win)
 185 {
 186     guint i;
 187
 188     for (i = 0; i < MASK_LIST_SIZE; ++i)
 189         XUngrabButton(ob_display, button, state | mask_list[i], win);
 190 }
 191
 192 void grab_key(guint keycode, guint state, Window win, gint keyboard_mode)
 193 {
 194     guint i;
 195
 196     xerror_set_ignore(TRUE); /* can get BadAccess' from these */
 197     xerror_occured = FALSE;
 198     for (i = 0; i < MASK_LIST_SIZE; ++i)
 199         XGrabKey(ob_display, keycode, state | mask_list[i], win, FALSE,
 200                  GrabModeAsync, keyboard_mode);
 201     xerror_set_ignore(FALSE);
 202     if (xerror_occured)
 203         ob_debug("Failed to grab keycode %d modifiers %d", keycode, state);
 204 }
 205
 206 void ungrab_all_keys(Window win)
 207 {
 208     XUngrabKey(ob_display, AnyKey, AnyModifier, win);
 209 }