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 (!(t == CurrentTime || event_time_after(t, grab_time)))
  47         /* When the time moves backward on the server, then we can't use
  48            the grab time because that will be in the future. So instead we
  49            have to use CurrentTime.
  50
  51            "XUngrabPointer does not release the pointer if the specified time
  52            is earlier than the last-pointer-grab time or is later than the
  53            current X server time."
  54         */
  55         t = CurrentTime; /*grab_time;*/
  56     return t;
  57 }
  58
  59 gboolean grab_on_keyboard()
  60 {
  61     return kgrabs > 0;
  62 }
  63
  64 gboolean grab_on_pointer()
  65 {
  66     return pgrabs > 0;
  67 }
  68
  69 gboolean grab_keyboard(gboolean grab)
  70 {
  71     gboolean ret = FALSE;
  72
  73     if (grab) {
  74         if (kgrabs++ == 0) {
  75             ret = XGrabKeyboard(ob_display, RootWindow(ob_display, ob_screen),
  76                                 False, GrabModeAsync, GrabModeAsync,
  77                                 event_curtime) == Success;
  78             if (!ret)
  79                 --kgrabs;
  80             else
  81                 grab_time = event_curtime;
  82         } else
  83             ret = TRUE;
  84     } else if (kgrabs > 0) {
  85         if (--kgrabs == 0) {
  86             XUngrabKeyboard(ob_display, ungrab_time());
  87         }
  88         ret = TRUE;
  89     }
  90
  91     return ret;
  92 }
  93
  94 gboolean grab_pointer(gboolean grab, gboolean owner_events, ObCursor cur)
  95 {
  96     gboolean ret = FALSE;
  97
  98     if (grab) {
  99         if (pgrabs++ == 0) {
 100             ret = XGrabPointer(ob_display, screen_support_win, owner_events,
 101                                GRAB_PTR_MASK,
 102                                GrabModeAsync, GrabModeAsync, None,
 103                                ob_cursor(cur), event_curtime) == Success;
 104             if (!ret)
 105                 --pgrabs;
 106             else
 107                 grab_time = event_curtime;
 108         } else
 109             ret = TRUE;
 110     } else if (pgrabs > 0) {
 111         if (--pgrabs == 0) {
 112             XUngrabPointer(ob_display, ungrab_time());
 113         }
 114         ret = TRUE;
 115     }
 116     return ret;
 117 }
 118
 119 gint grab_server(gboolean grab)
 120 {
 121     static guint sgrabs = 0;
 122     if (grab) {
 123         if (sgrabs++ == 0) {
 124             XGrabServer(ob_display);
 125             XSync(ob_display, FALSE);
 126         }
 127     } else if (sgrabs > 0) {
 128         if (--sgrabs == 0) {
 129             XUngrabServer(ob_display);
 130             XFlush(ob_display);
 131         }
 132     }
 133     return sgrabs;
 134 }
 135
 136 void grab_startup(gboolean reconfig)
 137 {
 138     guint i = 0;
 139     guint num, caps, scroll;
 140
 141     num = modkeys_key_to_mask(OB_MODKEY_KEY_NUMLOCK);
 142     caps = modkeys_key_to_mask(OB_MODKEY_KEY_CAPSLOCK);
 143     scroll = modkeys_key_to_mask(OB_MODKEY_KEY_SCROLLLOCK);
 144
 145     mask_list[i++] = 0;
 146     mask_list[i++] = num;
 147     mask_list[i++] = caps;
 148     mask_list[i++] = scroll;
 149     mask_list[i++] = num | caps;
 150     mask_list[i++] = num | scroll;
 151     mask_list[i++] = caps | scroll;
 152     mask_list[i++] = num | caps | scroll;
 153     g_assert(i == MASK_LIST_SIZE);
 154 }
 155
 156 void grab_shutdown(gboolean reconfig)
 157 {
 158     if (reconfig) return;
 159
 160     while (grab_keyboard(FALSE));
 161     while (grab_pointer(FALSE, FALSE, OB_CURSOR_NONE));
 162     while (grab_server(FALSE));
 163 }
 164
 165 void grab_button_full(guint button, guint state, Window win, guint mask,
 166                       gint pointer_mode, ObCursor cur)
 167 {
 168     guint i;
 169
 170     xerror_set_ignore(TRUE); /* can get BadAccess from these */
 171     xerror_occured = FALSE;
 172     for (i = 0; i < MASK_LIST_SIZE; ++i)
 173         XGrabButton(ob_display, button, state | mask_list[i], win, False, mask,
 174                     pointer_mode, GrabModeAsync, None, ob_cursor(cur));
 175     xerror_set_ignore(FALSE);
 176     if (xerror_occured)
 177         ob_debug("Failed to grab button %d modifiers %d", button, state);
 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         ob_debug("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 }