obt/keyboard.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    obt/keyboard.c for the Openbox window manager
   4    Copyright (c) 2007        Dana Jansens
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    See the COPYING file for a copy of the GNU General Public License.
  17 */
  18
  19 #include "obt/display.h"
  20 #include "obt/keyboard.h"
  21
  22 #include <X11/Xlib.h>
  23 #include <X11/keysym.h>
  24
  25 struct _ObtIC
  26 {
  27     guint ref;
  28     XIC xic;
  29     Window client;
  30     Window focus;
  31 };
  32
  33 /* These masks are constants and the modifier keys are bound to them as
  34    anyone sees fit:
  35         ShiftMask (1<<0), LockMask (1<<1), ControlMask (1<<2), Mod1Mask (1<<3),
  36         Mod2Mask (1<<4), Mod3Mask (1<<5), Mod4Mask (1<<6), Mod5Mask (1<<7)
  37 */
  38 #define NUM_MASKS 8
  39 #define ALL_MASKS 0xff /* an or'ing of all 8 keyboard masks */
  40
  41 /* Get the bitflag for the n'th modifier mask */
  42 #define nth_mask(n) (1 << n)
  43
  44 static void set_modkey_mask(guchar mask, KeySym sym);
  45 static void xim_init(void);
  46 void obt_keyboard_shutdown();
  47 void obt_keyboard_context_renew(ObtIC *ic);
  48
  49 static XModifierKeymap *modmap;
  50 static KeySym *keymap;
  51 static gint min_keycode, max_keycode, keysyms_per_keycode;
  52 /*! This is a bitmask of the different masks for each modifier key */
  53 static guchar modkeys_keys[OBT_KEYBOARD_NUM_MODKEYS];
  54
  55 static gboolean alt_l = FALSE;
  56 static gboolean meta_l = FALSE;
  57 static gboolean super_l = FALSE;
  58 static gboolean hyper_l = FALSE;
  59
  60 static gboolean started = FALSE;
  61
  62 static XIM xim = NULL;
  63 static XIMStyle xim_style = 0;
  64 static GSList *xic_all = NULL;
  65
  66 void obt_keyboard_reload(void)
  67 {
  68     gint i, j, k;
  69
  70     if (started) obt_keyboard_shutdown(); /* free stuff */
  71     started = TRUE;
  72
  73     xim_init();
  74
  75     /* reset the keys to not be bound to any masks */
  76     for (i = 0; i < OBT_KEYBOARD_NUM_MODKEYS; ++i)
  77         modkeys_keys[i] = 0;
  78
  79     modmap = XGetModifierMapping(obt_display);
  80     /* note: modmap->max_keypermod can be 0 when there is no valid key layout
  81        available */
  82
  83     XDisplayKeycodes(obt_display, &min_keycode, &max_keycode);
  84     keymap = XGetKeyboardMapping(obt_display, min_keycode,
  85                                  max_keycode - min_keycode + 1,
  86                                  &keysyms_per_keycode);
  87
  88     alt_l = meta_l = super_l = hyper_l = FALSE;
  89
  90     /* go through each of the modifier masks (eg ShiftMask, CapsMask...) */
  91     for (i = 0; i < NUM_MASKS; ++i) {
  92         /* go through each keycode that is bound to the mask */
  93         for (j = 0; j < modmap->max_keypermod; ++j) {
  94             KeySym sym;
  95             /* get a keycode that is bound to the mask (i) */
  96             KeyCode keycode = modmap->modifiermap[i*modmap->max_keypermod + j];
  97             if (keycode) {
  98                 /* go through each keysym bound to the given keycode */
  99                 for (k = 0; k < keysyms_per_keycode; ++k) {
 100                     sym = keymap[(keycode-min_keycode) * keysyms_per_keycode +
 101                                  k];
 102                     if (sym != NoSymbol) {
 103                         /* bind the key to the mask (e.g. Alt_L => Mod1Mask) */
 104                         set_modkey_mask(nth_mask(i), sym);
 105                     }
 106                 }
 107             }
 108         }
 109     }
 110
 111     /* CapsLock, Shift, and Control are special and hard-coded */
 112     modkeys_keys[OBT_KEYBOARD_MODKEY_CAPSLOCK] = LockMask;
 113     modkeys_keys[OBT_KEYBOARD_MODKEY_SHIFT] = ShiftMask;
 114     modkeys_keys[OBT_KEYBOARD_MODKEY_CONTROL] = ControlMask;
 115 }
 116
 117 void obt_keyboard_shutdown(void)
 118 {
 119     GSList *it;
 120
 121     XFreeModifiermap(modmap);
 122     modmap = NULL;
 123     XFree(keymap);
 124     keymap = NULL;
 125     for (it = xic_all; it; it = g_slist_next(it)) {
 126         ObtIC* ic = it->data;
 127         if (ic->xic) {
 128             XDestroyIC(ic->xic);
 129             ic->xic = NULL;
 130         }
 131     }
 132     if (xim) XCloseIM(xim);
 133     xim = NULL;
 134     xim_style = 0;
 135     started = FALSE;
 136 }
 137
 138 void xim_init(void)
 139 {
 140     GSList *it;
 141     gchar *aname, *aclass;
 142
 143     aname = g_strdup(g_get_prgname());
 144     if (!aname) aname = g_strdup("obt");
 145
 146     aclass = g_strdup(aname);
 147     if (g_ascii_islower(aclass[0]))
 148         aclass[0] = g_ascii_toupper(aclass[0]);
 149
 150     xim = XOpenIM(obt_display, NULL, aname, aclass);
 151
 152     if (!xim)
 153         g_message("Failed to open an Input Method");
 154     else {
 155         XIMStyles *xim_styles = NULL;
 156         char *r;
 157
 158         /* get the input method styles */
 159         r = XGetIMValues(xim, XNQueryInputStyle, &xim_styles, NULL);
 160         if (r || !xim_styles)
 161             g_message("Input Method does not support any styles");
 162         if (xim_styles) {
 163             int i;
 164
 165             /* find a style that doesnt need preedit or status */
 166             for (i = 0; i < xim_styles->count_styles; ++i) {
 167                 if (xim_styles->supported_styles[i] ==
 168                     (XIMPreeditNothing | XIMStatusNothing))
 169                 {
 170                     xim_style = xim_styles->supported_styles[i];
 171                     break;
 172                 }
 173             }
 174             XFree(xim_styles);
 175         }
 176
 177         if (!xim_style) {
 178             g_message("Input Method does not support a usable style");
 179
 180             XCloseIM(xim);
 181             xim = NULL;
 182         }
 183     }
 184
 185     /* any existing contexts need to be recreated for the new input method */
 186     for (it = xic_all; it; it = g_slist_next(it))
 187         obt_keyboard_context_renew(it->data);
 188
 189     g_free(aclass);
 190     g_free(aname);
 191 }
 192
 193 guint obt_keyboard_keyevent_to_modmask(XEvent *e)
 194 {
 195     gint i, masknum;
 196
 197     g_return_val_if_fail(e->type == KeyPress || e->type == KeyRelease,
 198                          OBT_KEYBOARD_MODKEY_NONE);
 199
 200     for (masknum = 0; masknum < NUM_MASKS; ++masknum)
 201         for (i = 0; i < modmap->max_keypermod; ++i) {
 202             KeyCode c = modmap->modifiermap[masknum*modmap->max_keypermod + i];
 203             if (c == e->xkey.keycode)
 204                 return 1<<masknum;
 205         }
 206     return 0;
 207 }
 208
 209 guint obt_keyboard_only_modmasks(guint mask)
 210 {
 211     mask &= ALL_MASKS;
 212     /* strip off these lock keys. they shouldn't affect key bindings */
 213     mask &= ~LockMask; /* use the LockMask, not what capslock is bound to,
 214                           because you could bind it to something else and it
 215                           should work as that modifier then. i think capslock
 216                           is weird in xkb. */
 217     mask &= ~obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_NUMLOCK);
 218     mask &= ~obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_SCROLLLOCK);
 219     return mask;
 220 }
 221
 222 guint obt_keyboard_modkey_to_modmask(ObtModkeysKey key)
 223 {
 224     return modkeys_keys[key];
 225 }
 226
 227 static void set_modkey_mask(guchar mask, KeySym sym)
 228 {
 229     /* find what key this is, and bind it to the mask */
 230
 231     if (sym == XK_Num_Lock)
 232         modkeys_keys[OBT_KEYBOARD_MODKEY_NUMLOCK] |= mask;
 233     else if (sym == XK_Scroll_Lock)
 234         modkeys_keys[OBT_KEYBOARD_MODKEY_SCROLLLOCK] |= mask;
 235
 236     else if (sym == XK_Super_L && super_l)
 237         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] |= mask;
 238     else if (sym == XK_Super_L && !super_l)
 239         /* left takes precident over right, so erase any masks the right
 240            key may have set */
 241         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] = mask, super_l = TRUE;
 242     else if (sym == XK_Super_R && !super_l)
 243         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] |= mask;
 244
 245     else if (sym == XK_Hyper_L && hyper_l)
 246         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] |= mask;
 247     else if (sym == XK_Hyper_L && !hyper_l)
 248         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] = mask, hyper_l = TRUE;
 249     else if (sym == XK_Hyper_R && !hyper_l)
 250         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] |= mask;
 251
 252     else if (sym == XK_Alt_L && alt_l)
 253         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] |= mask;
 254     else if (sym == XK_Alt_L && !alt_l)
 255         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] = mask, alt_l = TRUE;
 256     else if (sym == XK_Alt_R && !alt_l)
 257         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] |= mask;
 258
 259     else if (sym == XK_Meta_L && meta_l)
 260         modkeys_keys[OBT_KEYBOARD_MODKEY_META] |= mask;
 261     else if (sym == XK_Meta_L && !meta_l)
 262         modkeys_keys[OBT_KEYBOARD_MODKEY_META] = mask, meta_l = TRUE;
 263     else if (sym == XK_Meta_R && !meta_l)
 264         modkeys_keys[OBT_KEYBOARD_MODKEY_META] |= mask;
 265
 266     /* CapsLock, Shift, and Control are special and hard-coded */
 267 }
 268
 269 KeyCode* obt_keyboard_keysym_to_keycode(KeySym sym)
 270 {
 271     KeyCode *ret;
 272     gint i, j, n;
 273
 274     ret = g_new(KeyCode, 1);
 275     n = 0;
 276     ret[n] = 0;
 277
 278     /* go through each keycode and look for the keysym */
 279     for (i = min_keycode; i <= max_keycode; ++i)
 280         for (j = 0; j < keysyms_per_keycode; ++j)
 281             if (sym == keymap[(i-min_keycode) * keysyms_per_keycode + j]) {
 282                 ret = g_renew(KeyCode, ret, ++n + 1);
 283                 ret[n-1] = i;
 284                 ret[n] = 0;
 285             }
 286     return ret;
 287 }
 288
 289 gunichar obt_keyboard_keypress_to_unichar(ObtIC *ic, XEvent *ev)
 290 {
 291     gunichar unikey = 0;
 292     KeySym sym;
 293     Status status;
 294     gchar *buf, fixbuf[4]; /* 4 is enough for a utf8 char */
 295     gint len, bufsz;
 296     gboolean got_string = FALSE;
 297
 298     g_return_val_if_fail(ev->type == KeyPress, 0);
 299
 300     if (!ic)
 301         g_warning("Using obt_keyboard_keypress_to_unichar() without an "
 302                   "Input Context.  No i18n support!");
 303
 304     if (ic && ic->xic) {
 305         buf = fixbuf;
 306         bufsz = sizeof(fixbuf);
 307
 308 #ifdef X_HAVE_UTF8_STRING
 309         len = Xutf8LookupString(ic->xic, &ev->xkey, buf, bufsz, &sym, &status);
 310 #else
 311         len = XmbLookupString(ic->xic, &ev->xkey, buf, bufsz, &sym, &status);
 312 #endif
 313
 314         if (status == XBufferOverflow) {
 315             buf = g_new(char, len);
 316             bufsz = len;
 317
 318 #ifdef X_HAVE_UTF8_STRING
 319             len = Xutf8LookupString(ic->xic, &ev->xkey, buf, bufsz, &sym,
 320                                     &status);
 321 #else
 322             len = XmbLookupString(ic->xic, &ev->xkey, buf, bufsz, &sym,
 323                                   &status);
 324 #endif
 325         }
 326
 327         if ((status == XLookupChars || status == XLookupBoth)) {
 328             if ((guchar)buf[0] >= 32) { /* not an ascii control character */
 329 #ifndef X_HAVE_UTF8_STRING
 330                 /* convert to utf8 */
 331                 gchar *buf2 = buf;
 332                 buf = g_locale_to_utf8(buf2, r, NULL, NULL, NULL);
 333                 g_free(buf2);
 334 #endif
 335
 336                 got_string = TRUE;
 337             }
 338         }
 339         else if (status == XLookupKeySym)
 340             /* this key doesn't have a text representation, it is a command
 341                key of some sort */;
 342         else
 343             g_message("Bad keycode lookup. Keysym 0x%x Status: %s\n",
 344                       (guint) sym,
 345                       (status == XBufferOverflow ? "BufferOverflow" :
 346                        status == XLookupNone ? "XLookupNone" :
 347                        status == XLookupKeySym ? "XLookupKeySym" :
 348                        "Unknown status"));
 349     }
 350     else {
 351         buf = fixbuf;
 352         bufsz = sizeof(fixbuf);
 353         len = XLookupString(&ev->xkey, buf, bufsz, &sym, NULL);
 354         if ((guchar)buf[0] >= 32) /* not an ascii control character */
 355             got_string = TRUE;
 356     }
 357
 358     if (got_string) {
 359         gunichar u = g_utf8_get_char_validated(buf, len);
 360         if (u && u != (gunichar)-1 && u != (gunichar)-2)
 361             unikey = u;
 362     }
 363
 364     if (buf != fixbuf) g_free(buf);
 365
 366     return unikey;
 367 }
 368
 369 KeySym obt_keyboard_keypress_to_keysym(XEvent *ev)
 370 {
 371     KeySym sym;
 372
 373     g_return_val_if_fail(ev->type == KeyPress, None);
 374
 375     sym = None;
 376     XLookupString(&ev->xkey, NULL, 0, &sym, NULL);
 377     return sym;
 378 }
 379
 380 void obt_keyboard_context_renew(ObtIC *ic)
 381 {
 382     if (xim) {
 383         ic->xic = XCreateIC(xim,
 384                             XNInputStyle, xim_style,
 385                             XNClientWindow, ic->client,
 386                             XNFocusWindow, ic->focus,
 387                             NULL);
 388         if (!ic->xic)
 389             g_message("Error creating Input Context for window 0x%x 0x%x\n",
 390                       (guint)ic->client, (guint)ic->focus);
 391     }
 392 }
 393
 394 ObtIC* obt_keyboard_context_new(Window client, Window focus)
 395 {
 396     ObtIC *ic;
 397
 398     g_return_val_if_fail(client != None && focus != None, NULL);
 399
 400     ic = g_slice_new(ObtIC);
 401     ic->ref = 1;
 402     ic->client = client;
 403     ic->focus = focus;
 404     ic->xic = NULL;
 405
 406     obt_keyboard_context_renew(ic);
 407     xic_all = g_slist_prepend(xic_all, ic);
 408
 409     return ic;
 410 }
 411
 412 void obt_keyboard_context_ref(ObtIC *ic)
 413 {
 414     ++ic->ref;
 415 }
 416
 417 void obt_keyboard_context_unref(ObtIC *ic)
 418 {
 419     if (--ic->ref < 1) {
 420         xic_all = g_slist_remove(xic_all, ic);
 421         if (ic->xic)
 422             XDestroyIC(ic->xic);
 423         g_slice_free(ObtIC, ic);
 424     }
 425 }