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

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #include "config.h"
   4
   5 #include "display.hh"
   6 #include "util.hh"
   7
   8 extern "C" {
   9 #include <X11/keysym.h>
  10
  11 #ifdef    XKB
  12 #include <X11/XKBlib.h>
  13 #endif // XKB
  14
  15 #ifdef    SHAPE
  16 #include <X11/extensions/shape.h>
  17 #endif // SHAPE
  18
  19 #ifdef    XINERAMA
  20 #include <X11/extensions/Xinerama.h>
  21 #endif // XINERAMA
  22
  23 #ifdef    HAVE_SIGNAL_H
  24 #  include <signal.h>
  25 #endif // HAVE_SIGNAL_H
  26
  27 #ifdef    HAVE_FCNTL_H
  28 #  include <fcntl.h>
  29 #endif // HAVE_FCNTL_H
  30
  31 #ifdef    HAVE_UNISTD_H
  32 #  include <sys/types.h>
  33 #  include <unistd.h>
  34 #endif // HAVE_UNISTD_H
  35
  36 #include "../src/gettext.h"
  37 #define _(str) gettext(str)
  38 }
  39
  40 #include <cstdio>
  41
  42 namespace otk {
  43
  44
  45 Display *display = (Display*) 0;
  46
  47 static int xerrorHandler(::Display *d, XErrorEvent *e)
  48 {
  49   if (!display->ignoreErrors()) {
  50 #ifdef DEBUG
  51     char errtxt[128];
  52
  53     //if (e->error_code != BadWindow)
  54     {
  55       XGetErrorText(d, e->error_code, errtxt, 127);
  56       printf("X Error: %s\n", errtxt);
  57       if (e->error_code != BadWindow)
  58         abort();
  59     }
  60 #else
  61     (void)d;
  62     (void)e;
  63 #endif
  64   }
  65   return false;
  66 }
  67
  68
  69 Display::Display(::Display *d)
  70   : _display(d),
  71     _xkb(false),
  72     _xkb_event_basep(0),
  73     _shape(false),
  74     _shape_event_basep(0),
  75     _xinerama(false),
  76     _xinerama_event_basep(0),
  77     _mask_list(),
  78     _num_lock_mask(0),
  79     _scroll_lock_mask(0),
  80     _grab_count(0)
  81 {
  82   int junk;
  83   (void)junk;
  84
  85   assert(_display);
  86
  87   display = this;
  88
  89   if (fcntl(ConnectionNumber(_display), F_SETFD, 1) == -1) {
  90     printf(_("Couldn't mark display connection as close-on-exec.\n\n"));
  91     ::exit(1);
  92   }
  93   if (!XSupportsLocale())
  94     printf(_("X server does not support locale.\n"));
  95   if (!XSetLocaleModifiers(""))
  96     printf(_("Cannot set locale modifiers for the X server.\n"));
  97
  98   // set our error handler for X errors
  99   XSetErrorHandler(xerrorHandler);
 100
 101   // set the DISPLAY environment variable for any lauched children, to the
 102   // display we're using, so they open in the right place.
 103   putenv(std::string("DISPLAY=") + DisplayString(_display));
 104
 105   // find the availability of X extensions we like to use
 106 #ifdef XKB
 107   _xkb = XkbQueryExtension(_display, &junk, &_xkb_event_basep, &junk, NULL,
 108                            NULL);
 109 #endif
 110
 111 #ifdef SHAPE
 112   _shape = XShapeQueryExtension(_display, &_shape_event_basep, &junk);
 113 #endif
 114
 115 #ifdef XINERAMA
 116   _xinerama = XineramaQueryExtension(_display, &_xinerama_event_basep, &junk);
 117 #endif // XINERAMA
 118
 119   // get lock masks that are defined by the display (not constant)
 120   _modmap = XGetModifierMapping(_display);
 121   assert(_modmap);
 122   if (_modmap && _modmap->max_keypermod > 0) {
 123     const int mask_table[] = {
 124       ShiftMask, LockMask, ControlMask, Mod1Mask,
 125       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 126     };
 127     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 128       _modmap->max_keypermod;
 129     // get the values of the keyboard lock modifiers
 130     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 131     // since it doesn't need to be.
 132     const KeyCode num_lock = XKeysymToKeycode(_display, XK_Num_Lock);
 133     const KeyCode scroll_lock = XKeysymToKeycode(_display, XK_Scroll_Lock);
 134
 135     for (size_t cnt = 0; cnt < size; ++cnt) {
 136       if (! _modmap->modifiermap[cnt]) continue;
 137
 138       if (num_lock == _modmap->modifiermap[cnt])
 139         _num_lock_mask = mask_table[cnt / _modmap->max_keypermod];
 140       if (scroll_lock == _modmap->modifiermap[cnt])
 141         _scroll_lock_mask = mask_table[cnt / _modmap->max_keypermod];
 142     }
 143   }
 144
 145   _mask_list[0] = 0;
 146   _mask_list[1] = LockMask;
 147   _mask_list[2] = _num_lock_mask;
 148   _mask_list[3] = LockMask | _num_lock_mask;
 149   _mask_list[4] = _scroll_lock_mask;
 150   _mask_list[5] = _scroll_lock_mask | LockMask;
 151   _mask_list[6] = _scroll_lock_mask | _num_lock_mask;
 152   _mask_list[7] = _scroll_lock_mask | LockMask | _num_lock_mask;
 153
 154   /*
 155     If the default depth is at least 8 we will use that,
 156     otherwise we try to find the largest TrueColor visual.
 157     Preference is given to 24 bit over larger depths if 24 bit is an option.
 158   */
 159
 160   int screen = DefaultScreen(_display);
 161   _depth = DefaultDepth(_display, screen);
 162   _visual = DefaultVisual(_display, screen);
 163   _colormap = DefaultColormap(_display, screen);
 164
 165   if (_depth < 8) {
 166     // search for a TrueColor Visual... if we can't find one...
 167     // we will use the default visual for the screen
 168     XVisualInfo vinfo_template, *vinfo_return;
 169     int vinfo_nitems;
 170     int best = -1;
 171
 172     vinfo_template.screen = screen;
 173     vinfo_template.c_class = TrueColor;
 174
 175     vinfo_return = XGetVisualInfo(_display,
 176                                   VisualScreenMask | VisualClassMask,
 177                                   &vinfo_template, &vinfo_nitems);
 178     if (vinfo_return) {
 179       int max_depth = 1;
 180       for (int i = 0; i < vinfo_nitems; ++i) {
 181         if (vinfo_return[i].depth > max_depth) {
 182           if (max_depth == 24 && vinfo_return[i].depth > 24)
 183             break;          // prefer 24 bit over 32
 184           max_depth = vinfo_return[i].depth;
 185           best = i;
 186         }
 187       }
 188       if (max_depth < _depth) best = -1;
 189     }
 190
 191     if (best != -1) {
 192       _depth = vinfo_return[best].depth;
 193       _visual = vinfo_return[best].visual;
 194       _colormap = XCreateColormap(_display, RootWindow(_display, screen),
 195                                   _visual, AllocNone);
 196     }
 197
 198     XFree(vinfo_return);
 199   }
 200 }
 201
 202
 203 Display::~Display()
 204 {
 205   while (_grab_count > 0)
 206     ungrab();
 207
 208   XFreeModifiermap(_modmap);
 209
 210   XCloseDisplay(_display);
 211 }
 212
 213
 214 void Display::setIgnoreErrors(bool t)
 215 {
 216   // sync up so that anything already sent is/isn't ignored!
 217   XSync(_display, false);
 218   _ignore_errors = t;
 219 }
 220
 221 void Display::grab()
 222 {
 223   if (_grab_count == 0) {
 224     XGrabServer(_display);
 225     XSync(_display, false); // make sure it kicks in
 226   }
 227   _grab_count++;
 228 }
 229
 230
 231 void Display::ungrab()
 232 {
 233   if (_grab_count == 0) return;
 234   _grab_count--;
 235   if (_grab_count == 0) {
 236     XUngrabServer(_display);
 237     XFlush(_display); // ungrab as soon as possible
 238   }
 239 }
 240
 241
 242
 243
 244
 245
 246
 247 /*
 248  * Grabs a button, but also grabs the button in every possible combination
 249  * with the keyboard lock keys, so that they do not cancel out the event.
 250
 251  * if allow_scroll_lock is true then only the top half of the lock mask
 252  * table is used and scroll lock is ignored.  This value defaults to false.
 253  */
 254 void Display::grabButton(unsigned int button, unsigned int modifiers,
 255                          Window grab_window, bool owner_events,
 256                          unsigned int event_mask, int pointer_mode,
 257                          int keyboard_mode, Window confine_to,
 258                          Cursor cursor, bool allow_scroll_lock) const
 259 {
 260   unsigned int length = (allow_scroll_lock) ? 8 / 2:
 261                                               8;
 262   for (size_t cnt = 0; cnt < length; ++cnt)
 263     XGrabButton(_display, button, modifiers | _mask_list[cnt],
 264                 grab_window, owner_events, event_mask, pointer_mode,
 265                 keyboard_mode, confine_to, cursor);
 266 }
 267
 268
 269 /*
 270  * Releases the grab on a button, and ungrabs all possible combinations of the
 271  * keyboard lock keys.
 272  */
 273 void Display::ungrabButton(unsigned int button, unsigned int modifiers,
 274                            Window grab_window) const
 275 {
 276   for (size_t cnt = 0; cnt < 8; ++cnt)
 277     XUngrabButton(_display, button, modifiers | _mask_list[cnt],
 278                   grab_window);
 279 }
 280
 281 void Display::grabKey(unsigned int keycode, unsigned int modifiers,
 282                         Window grab_window, bool owner_events,
 283                         int pointer_mode, int keyboard_mode,
 284                         bool allow_scroll_lock) const
 285 {
 286   unsigned int length = (allow_scroll_lock) ? 8 / 2:
 287                                               8;
 288   for (size_t cnt = 0; cnt < length; ++cnt)
 289     XGrabKey(_display, keycode, modifiers | _mask_list[cnt],
 290                 grab_window, owner_events, pointer_mode, keyboard_mode);
 291 }
 292
 293 void Display::ungrabKey(unsigned int keycode, unsigned int modifiers,
 294                           Window grab_window) const
 295 {
 296   for (size_t cnt = 0; cnt < 8; ++cnt)
 297     XUngrabKey(_display, keycode, modifiers | _mask_list[cnt],
 298                grab_window);
 299 }
 300
 301 void Display::ungrabAllKeys(Window grab_window) const
 302 {
 303   XUngrabKey(_display, AnyKey, AnyModifier, grab_window);
 304 }
 305
 306 }