Dogcows Code - chaz/openbox/blob - otk/display.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #ifdef HAVE_CONFIG_H
   4 # include "../config.h"
   5 #endif
   6
   7 #include "display.hh"
   8 #include "screeninfo.hh"
   9 #include "gccache.hh"
  10 #include "util.hh"
  11
  12 extern "C" {
  13 #include <X11/keysym.h>
  14
  15 #ifdef    XKB
  16 #include <X11/XKBlib.h>
  17 #endif // XKB
  18
  19 #ifdef    SHAPE
  20 #include <X11/extensions/shape.h>
  21 #endif // SHAPE
  22
  23 #ifdef    XINERAMA
  24 #include <X11/extensions/Xinerama.h>
  25 #endif // XINERAMA
  26
  27 #ifdef    HAVE_STDIO_H
  28 #  include <stdio.h>
  29 #endif // HAVE_STDIO_H
  30
  31 #ifdef    HAVE_SIGNAL_H
  32 #  include <signal.h>
  33 #endif // HAVE_SIGNAL_H
  34
  35 #ifdef    HAVE_FCNTL_H
  36 #  include <fcntl.h>
  37 #endif // HAVE_FCNTL_H
  38
  39 #ifdef    HAVE_UNISTD_H
  40 #  include <sys/types.h>
  41 #  include <unistd.h>
  42 #endif // HAVE_UNISTD_H
  43
  44 #include "gettext.h"
  45 #define _(str) gettext(str)
  46 }
  47
  48 namespace otk {
  49
  50
  51 Display *display = (Display*) 0;
  52
  53 static int xerrorHandler(::Display *d, XErrorEvent *e)
  54 {
  55 #ifdef DEBUG
  56   char errtxt[128];
  57
  58   //if (e->error_code != BadWindow)
  59   {
  60     XGetErrorText(d, e->error_code, errtxt, 128);
  61     printf("X Error: %s\n", errtxt);
  62     if (e->error_code != BadWindow)
  63       abort();
  64   }
  65 #else
  66   (void)d;
  67   (void)e;
  68 #endif
  69
  70   return false;
  71 }
  72
  73
  74 Display::Display()
  75   : _display(0),
  76     _xkb(false),
  77     _xkb_event_basep(0),
  78     _shape(false),
  79     _shape_event_basep(0),
  80     _xinerama(false),
  81     _xinerama_event_basep(0),
  82     _mask_list(),
  83     _num_lock_mask(0),
  84     _scroll_lock_mask(0),
  85     _grab_count(0),
  86     _screenInfoList(),
  87     _gccache((GCCache*) 0)
  88 {
  89   int junk;
  90   (void)junk;
  91
  92   // Open the X display
  93   if (!(_display = XOpenDisplay(NULL))) {
  94     printf(_("Unable to open connection to the X server. Please set the \n\
  95 DISPLAY environment variable approriately.\n\n"));
  96     ::exit(1);
  97   }
  98   if (fcntl(ConnectionNumber(_display), F_SETFD, 1) == -1) {
  99     printf(_("Couldn't mark display connection as close-on-exec.\n\n"));
 100     ::exit(1);
 101   }
 102   if (!XSupportsLocale())
 103     printf(_("X server does not support locale.\n"));
 104   if (!XSetLocaleModifiers(""))
 105     printf(_("Cannot set locale modifiers for the X server.\n"));
 106
 107   // set our error handler for X errors
 108   XSetErrorHandler(xerrorHandler);
 109
 110   // set the DISPLAY environment variable for any lauched children, to the
 111   // display we're using, so they open in the right place.
 112   putenv(std::string("DISPLAY=") + DisplayString(_display));
 113
 114   // find the availability of X extensions we like to use
 115 #ifdef XKB
 116   _xkb = XkbQueryExtension(_display, &junk, &_xkb_event_basep, &junk, NULL,
 117                            NULL);
 118 #endif
 119
 120 #ifdef SHAPE
 121   _shape = XShapeQueryExtension(_display, &_shape_event_basep, &junk);
 122 #endif
 123
 124 #ifdef XINERAMA
 125   _xinerama = XineramaQueryExtension(_display, &_xinerama_event_basep, &junk);
 126 #endif // XINERAMA
 127
 128   // get lock masks that are defined by the display (not constant)
 129   XModifierKeymap *modmap;
 130
 131   modmap = XGetModifierMapping(_display);
 132   if (modmap && modmap->max_keypermod > 0) {
 133     const int mask_table[] = {
 134       ShiftMask, LockMask, ControlMask, Mod1Mask,
 135       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 136     };
 137     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 138       modmap->max_keypermod;
 139     // get the values of the keyboard lock modifiers
 140     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 141     // since it doesn't need to be.
 142     const KeyCode num_lock = XKeysymToKeycode(_display, XK_Num_Lock);
 143     const KeyCode scroll_lock = XKeysymToKeycode(_display, XK_Scroll_Lock);
 144
 145     for (size_t cnt = 0; cnt < size; ++cnt) {
 146       if (! modmap->modifiermap[cnt]) continue;
 147
 148       if (num_lock == modmap->modifiermap[cnt])
 149         _num_lock_mask = mask_table[cnt / modmap->max_keypermod];
 150       if (scroll_lock == modmap->modifiermap[cnt])
 151         _scroll_lock_mask = mask_table[cnt / modmap->max_keypermod];
 152     }
 153   }
 154
 155   if (modmap) XFreeModifiermap(modmap);
 156
 157   _mask_list[0] = 0;
 158   _mask_list[1] = LockMask;
 159   _mask_list[2] = _num_lock_mask;
 160   _mask_list[3] = LockMask | _num_lock_mask;
 161   _mask_list[4] = _scroll_lock_mask;
 162   _mask_list[5] = _scroll_lock_mask | LockMask;
 163   _mask_list[6] = _scroll_lock_mask | _num_lock_mask;
 164   _mask_list[7] = _scroll_lock_mask | LockMask | _num_lock_mask;
 165
 166   // Get information on all the screens which are available.
 167   _screenInfoList.reserve(ScreenCount(_display));
 168   for (int i = 0; i < ScreenCount(_display); ++i)
 169     _screenInfoList.push_back(ScreenInfo(i));
 170
 171   _gccache = new GCCache(_screenInfoList.size());
 172 }
 173
 174
 175 Display::~Display()
 176 {
 177   delete _gccache;
 178   while (_grab_count > 0)
 179     ungrab();
 180   XCloseDisplay(_display);
 181 }
 182
 183
 184 const ScreenInfo* Display::screenInfo(int snum)
 185 {
 186   assert(snum >= 0);
 187   assert(snum < static_cast<int>(_screenInfoList.size()));
 188   return &_screenInfoList[snum];
 189 }
 190
 191
 192 const ScreenInfo* Display::findScreen(Window root)
 193 {
 194   ScreenInfoList::iterator it, end = _screenInfoList.end();
 195   for (it = _screenInfoList.begin(); it != end; ++it)
 196     if (it->rootWindow() == root)
 197       return &(*it);
 198   return 0;
 199 }
 200
 201
 202 void Display::grab()
 203 {
 204   if (_grab_count == 0)
 205     XGrabServer(_display);
 206   _grab_count++;
 207 }
 208
 209
 210 void Display::ungrab()
 211 {
 212   if (_grab_count == 0) return;
 213   _grab_count--;
 214   if (_grab_count == 0)
 215     XUngrabServer(_display);
 216 }
 217
 218
 219
 220
 221
 222
 223
 224 /*
 225  * Grabs a button, but also grabs the button in every possible combination
 226  * with the keyboard lock keys, so that they do not cancel out the event.
 227
 228  * if allow_scroll_lock is true then only the top half of the lock mask
 229  * table is used and scroll lock is ignored.  This value defaults to false.
 230  */
 231 void Display::grabButton(unsigned int button, unsigned int modifiers,
 232                          Window grab_window, bool owner_events,
 233                          unsigned int event_mask, int pointer_mode,
 234                          int keyboard_mode, Window confine_to,
 235                          Cursor cursor, bool allow_scroll_lock) const
 236 {
 237   unsigned int length = (allow_scroll_lock) ? 8 / 2:
 238                                               8;
 239   for (size_t cnt = 0; cnt < length; ++cnt)
 240     XGrabButton(_display, button, modifiers | _mask_list[cnt],
 241                 grab_window, owner_events, event_mask, pointer_mode,
 242                 keyboard_mode, confine_to, cursor);
 243 }
 244
 245
 246 /*
 247  * Releases the grab on a button, and ungrabs all possible combinations of the
 248  * keyboard lock keys.
 249  */
 250 void Display::ungrabButton(unsigned int button, unsigned int modifiers,
 251                            Window grab_window) const
 252 {
 253   for (size_t cnt = 0; cnt < 8; ++cnt)
 254     XUngrabButton(_display, button, modifiers | _mask_list[cnt],
 255                   grab_window);
 256 }
 257
 258 void Display::grabKey(unsigned int keycode, unsigned int modifiers,
 259                         Window grab_window, bool owner_events,
 260                         int pointer_mode, int keyboard_mode,
 261                         bool allow_scroll_lock) const
 262 {
 263   unsigned int length = (allow_scroll_lock) ? 8 / 2:
 264                                               8;
 265   for (size_t cnt = 0; cnt < length; ++cnt)
 266     XGrabKey(_display, keycode, modifiers | _mask_list[cnt],
 267                 grab_window, owner_events, pointer_mode, keyboard_mode);
 268 }
 269
 270 void Display::ungrabKey(unsigned int keycode, unsigned int modifiers,
 271                           Window grab_window) const
 272 {
 273   for (size_t cnt = 0; cnt < 8; ++cnt)
 274     XUngrabKey(_display, keycode, modifiers | _mask_list[cnt],
 275                grab_window);
 276 }
 277
 278 }