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