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(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(gboolean grab, gboolean owner_events, ObCursor cur)
  96 {
  97     gboolean ret = FALSE;
  98
  99     if (grab) {
 100         if (pgrabs++ == 0) {
 101             ret = XGrabPointer(ob_display, screen_support_win, owner_events,
 102                                GRAB_PTR_MASK,
 103                                GrabModeAsync, GrabModeAsync, None,
 104                                ob_cursor(cur), event_curtime) == Success;
 105             if (!ret)
 106                 --pgrabs;
 107             else
 108                 grab_time = event_curtime;
 109         } else
 110             ret = TRUE;
 111     } else if (pgrabs > 0) {
 112         if (--pgrabs == 0) {
 113             XUngrabPointer(ob_display, ungrab_time());
 114         }
 115         ret = TRUE;
 116     }
 117     return ret;
 118 }
 119
 120 gint grab_server(gboolean grab)
 121 {
 122     static guint sgrabs = 0;
 123     if (grab) {
 124         if (sgrabs++ == 0) {
 125             XGrabServer(ob_display);
 126             XSync(ob_display, FALSE);
 127         }
 128     } else if (sgrabs > 0) {
 129         if (--sgrabs == 0) {
 130             XUngrabServer(ob_display);
 131             XFlush(ob_display);
 132         }
 133     }
 134     return sgrabs;
 135 }
 136
 137 void grab_startup(gboolean reconfig)
 138 {
 139     guint i = 0;
 140     guint num, caps, scroll;
 141
 142     num = modkeys_key_to_mask(OB_MODKEY_KEY_NUMLOCK);
 143     caps = modkeys_key_to_mask(OB_MODKEY_KEY_CAPSLOCK);
 144     scroll = modkeys_key_to_mask(OB_MODKEY_KEY_SCROLLLOCK);
 145
 146     mask_list[i++] = 0;
 147     mask_list[i++] = num;
 148     mask_list[i++] = caps;
 149     mask_list[i++] = scroll;
 150     mask_list[i++] = num | caps;
 151     mask_list[i++] = num | scroll;
 152     mask_list[i++] = caps | scroll;
 153     mask_list[i++] = num | caps | scroll;
 154     g_assert(i == MASK_LIST_SIZE);
 155 }
 156
 157 void grab_shutdown(gboolean reconfig)
 158 {
 159     if (reconfig) return;
 160
 161     while (grab_keyboard(FALSE));
 162     while (grab_pointer(FALSE, FALSE, OB_CURSOR_NONE));
 163     while (grab_server(FALSE));
 164 }
 165
 166 void grab_button_full(guint button, guint state, Window win, guint mask,
 167                       gint pointer_mode, ObCursor cur)
 168 {
 169     guint i;
 170
 171     xerror_set_ignore(TRUE); /* can get BadAccess from these */
 172     xerror_occured = FALSE;
 173     for (i = 0; i < MASK_LIST_SIZE; ++i)
 174         XGrabButton(ob_display, button, state | mask_list[i], win, False, mask,
 175                     pointer_mode, GrabModeAsync, None, ob_cursor(cur));
 176     xerror_set_ignore(FALSE);
 177     if (xerror_occured)
 178         ob_debug("Failed to grab button %d modifiers %d", button, state);
 179 }
 180
 181 void ungrab_button(guint button, guint state, Window win)
 182 {
 183     guint i;
 184
 185     for (i = 0; i < MASK_LIST_SIZE; ++i)
 186         XUngrabButton(ob_display, button, state | mask_list[i], win);
 187 }
 188
 189 void grab_key(guint keycode, guint state, Window win, gint keyboard_mode)
 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         XGrabKey(ob_display, keycode, state | mask_list[i], win, FALSE,
 197                  GrabModeAsync, keyboard_mode);
 198     xerror_set_ignore(FALSE);
 199     if (xerror_occured)
 200         ob_debug("Failed to grab keycode %d modifiers %d", keycode, state);
 201 }
 202
 203 void ungrab_all_keys(Window win)
 204 {
 205     XUngrabKey(ob_display, AnyKey, AnyModifier, win);
 206 }