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   display = this;
  93
  94   // Open the X display
  95   if (!(_display = XOpenDisplay(NULL))) {
  96     printf(_("Unable to open connection to the X server. Please set the \n\
  97 DISPLAY environment variable approriately.\n\n"));
  98     ::exit(1);
  99   }
 100   if (fcntl(ConnectionNumber(_display), F_SETFD, 1) == -1) {
 101     printf(_("Couldn't mark display connection as close-on-exec.\n\n"));
 102     ::exit(1);
 103   }
 104   if (!XSupportsLocale())
 105     printf(_("X server does not support locale.\n"));
 106   if (!XSetLocaleModifiers(""))
 107     printf(_("Cannot set locale modifiers for the X server.\n"));
 108
 109   // set our error handler for X errors
 110   XSetErrorHandler(xerrorHandler);
 111
 112   // set the DISPLAY environment variable for any lauched children, to the
 113   // display we're using, so they open in the right place.
 114   putenv(std::string("DISPLAY=") + DisplayString(_display));
 115
 116   // find the availability of X extensions we like to use
 117 #ifdef XKB
 118   _xkb = XkbQueryExtension(_display, &junk, &_xkb_event_basep, &junk, NULL,
 119                            NULL);
 120 #endif
 121
 122 #ifdef SHAPE
 123   _shape = XShapeQueryExtension(_display, &_shape_event_basep, &junk);
 124 #endif
 125
 126 #ifdef XINERAMA
 127   _xinerama = XineramaQueryExtension(_display, &_xinerama_event_basep, &junk);
 128 #endif // XINERAMA
 129
 130   // get lock masks that are defined by the display (not constant)
 131   XModifierKeymap *modmap;
 132
 133   modmap = XGetModifierMapping(_display);
 134   if (modmap && modmap->max_keypermod > 0) {
 135     const int mask_table[] = {
 136       ShiftMask, LockMask, ControlMask, Mod1Mask,
 137       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 138     };
 139     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 140       modmap->max_keypermod;
 141     // get the values of the keyboard lock modifiers
 142     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 143     // since it doesn't need to be.
 144     const KeyCode num_lock = XKeysymToKeycode(_display, XK_Num_Lock);
 145     const KeyCode scroll_lock = XKeysymToKeycode(_display, XK_Scroll_Lock);
 146
 147     for (size_t cnt = 0; cnt < size; ++cnt) {
 148       if (! modmap->modifiermap[cnt]) continue;
 149
 150       if (num_lock == modmap->modifiermap[cnt])
 151         _num_lock_mask = mask_table[cnt / modmap->max_keypermod];
 152       if (scroll_lock == modmap->modifiermap[cnt])
 153         _scroll_lock_mask = mask_table[cnt / modmap->max_keypermod];
 154     }
 155   }
 156
 157   if (modmap) XFreeModifiermap(modmap);
 158
 159   _mask_list[0] = 0;
 160   _mask_list[1] = LockMask;
 161   _mask_list[2] = _num_lock_mask;
 162   _mask_list[3] = LockMask | _num_lock_mask;
 163   _mask_list[4] = _scroll_lock_mask;
 164   _mask_list[5] = _scroll_lock_mask | LockMask;
 165   _mask_list[6] = _scroll_lock_mask | _num_lock_mask;
 166   _mask_list[7] = _scroll_lock_mask | LockMask | _num_lock_mask;
 167
 168   // Get information on all the screens which are available.
 169   _screenInfoList.reserve(ScreenCount(_display));
 170   for (int i = 0; i < ScreenCount(_display); ++i)
 171     _screenInfoList.push_back(ScreenInfo(i));
 172
 173   _gccache = new GCCache(_screenInfoList.size());
 174 }
 175
 176
 177 Display::~Display()
 178 {
 179   delete _gccache;
 180   while (_grab_count > 0)
 181     ungrab();
 182   XCloseDisplay(_display);
 183 }
 184
 185
 186 const ScreenInfo* Display::screenInfo(int snum)
 187 {
 188   assert(snum >= 0);
 189   assert(snum < static_cast<int>(_screenInfoList.size()));
 190   return &_screenInfoList[snum];
 191 }
 192
 193
 194 const ScreenInfo* Display::findScreen(Window root)
 195 {
 196   ScreenInfoList::iterator it, end = _screenInfoList.end();
 197   for (it = _screenInfoList.begin(); it != end; ++it)
 198     if (it->rootWindow() == root)
 199       return &(*it);
 200   return 0;
 201 }
 202
 203
 204 void Display::grab()
 205 {
 206   if (_grab_count == 0)
 207     XGrabServer(_display);
 208   _grab_count++;
 209 }
 210
 211
 212 void Display::ungrab()
 213 {
 214   if (_grab_count == 0) return;
 215   _grab_count--;
 216   if (_grab_count == 0)
 217     XUngrabServer(_display);
 218 }
 219
 220
 221
 222
 223
 224
 225
 226 /*
 227  * Grabs a button, but also grabs the button in every possible combination
 228  * with the keyboard lock keys, so that they do not cancel out the event.
 229
 230  * if allow_scroll_lock is true then only the top half of the lock mask
 231  * table is used and scroll lock is ignored.  This value defaults to false.
 232  */
 233 void Display::grabButton(unsigned int button, unsigned int modifiers,
 234                          Window grab_window, bool owner_events,
 235                          unsigned int event_mask, int pointer_mode,
 236                          int keyboard_mode, Window confine_to,
 237                          Cursor cursor, bool allow_scroll_lock) const
 238 {
 239   unsigned int length = (allow_scroll_lock) ? 8 / 2:
 240                                               8;
 241   for (size_t cnt = 0; cnt < length; ++cnt)
 242     XGrabButton(_display, button, modifiers | _mask_list[cnt],
 243                 grab_window, owner_events, event_mask, pointer_mode,
 244                 keyboard_mode, confine_to, cursor);
 245 }
 246
 247
 248 /*
 249  * Releases the grab on a button, and ungrabs all possible combinations of the
 250  * keyboard lock keys.
 251  */
 252 void Display::ungrabButton(unsigned int button, unsigned int modifiers,
 253                            Window grab_window) const
 254 {
 255   for (size_t cnt = 0; cnt < 8; ++cnt)
 256     XUngrabButton(_display, button, modifiers | _mask_list[cnt],
 257                   grab_window);
 258 }
 259
 260 void Display::grabKey(unsigned int keycode, unsigned int modifiers,
 261                         Window grab_window, bool owner_events,
 262                         int pointer_mode, int keyboard_mode,
 263                         bool allow_scroll_lock) const
 264 {
 265   unsigned int length = (allow_scroll_lock) ? 8 / 2:
 266                                               8;
 267   for (size_t cnt = 0; cnt < length; ++cnt)
 268     XGrabKey(_display, keycode, modifiers | _mask_list[cnt],
 269                 grab_window, owner_events, pointer_mode, keyboard_mode);
 270 }
 271
 272 void Display::ungrabKey(unsigned int keycode, unsigned int modifiers,
 273                           Window grab_window) const
 274 {
 275   for (size_t cnt = 0; cnt < 8; ++cnt)
 276     XUngrabKey(_display, keycode, modifiers | _mask_list[cnt],
 277                grab_window);
 278 }
 279
 280 }