Dogcows Code - chaz/openbox/blob - 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     XFreeModifiermap(modmap);
 120     modmap = NULL;
 121     XFree(keymap);
 122     keymap = NULL;
 123     if (xim) XCloseIM(xim);
 124     xim = NULL;
 125     xim_style = 0;
 126     started = FALSE;
 127 }
 128
 129 void xim_init(void)
 130 {
 131     GSList *it;
 132     gchar *aname, *aclass;
 133
 134     aname = g_strdup(g_get_prgname());
 135     if (!aname) aname = g_strdup("obt");
 136
 137     aclass = g_strdup(aname);
 138     if (g_ascii_islower(aclass[0]))
 139         aclass[0] = g_ascii_toupper(aclass[0]);
 140
 141     g_print("Opening Input Method for %s %s\n", aname, aclass);
 142     xim = XOpenIM(obt_display, NULL, aname, aclass);
 143
 144     if (!xim)
 145         g_message("Failed to open an Input Method");
 146     else {
 147         XIMStyles *xim_styles = NULL;
 148         char *r;
 149
 150         /* get the input method styles */
 151         r = XGetIMValues(xim, XNQueryInputStyle, &xim_styles, NULL);
 152         if (r || !xim_styles)
 153             g_message("Input Method does not support any styles");
 154         if (xim_styles) {
 155             int i;
 156
 157             /* find a style that doesnt need preedit or status */
 158             for (i = 0; i < xim_styles->count_styles; ++i) {
 159                 if (xim_styles->supported_styles[i] ==
 160                     (XIMPreeditNothing | XIMStatusNothing))
 161                 {
 162                     xim_style = xim_styles->supported_styles[i];
 163                     break;
 164                 }
 165             }
 166             XFree(xim_styles);
 167         }
 168
 169         if (!xim_style) {
 170             g_message("Input Method does not support a usable style");
 171
 172             XCloseIM(xim);
 173             xim = NULL;
 174         }
 175     }
 176
 177     /* any existing contexts need to be recreated for the new input method */
 178     for (it = xic_all; it; it = g_slist_next(it))
 179         obt_keyboard_context_renew(it->data);
 180
 181     g_free(aclass);
 182     g_free(aname);
 183 }
 184
 185 guint obt_keyboard_keycode_to_modmask(guint keycode)
 186 {
 187     gint i, j;
 188     guint mask = 0;
 189
 190     if (keycode == NoSymbol) return 0;
 191
 192     /* go through each of the modifier masks (eg ShiftMask, CapsMask...) */
 193     for (i = 0; i < NUM_MASKS; ++i) {
 194         /* go through each keycode that is bound to the mask */
 195         for (j = 0; j < modmap->max_keypermod; ++j) {
 196             /* compare with a keycode that is bound to the mask (i) */
 197             if (modmap->modifiermap[i*modmap->max_keypermod + j] == keycode)
 198                 mask |= nth_mask(i);
 199         }
 200     }
 201     return mask;
 202 }
 203
 204 guint obt_keyboard_only_modmasks(guint mask)
 205 {
 206     mask &= ALL_MASKS;
 207     /* strip off these lock keys. they shouldn't affect key bindings */
 208     mask &= ~LockMask; /* use the LockMask, not what capslock is bound to,
 209                           because you could bind it to something else and it
 210                           should work as that modifier then. i think capslock
 211                           is weird in xkb. */
 212     mask &= ~obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_NUMLOCK);
 213     mask &= ~obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_SCROLLLOCK);
 214     return mask;
 215 }
 216
 217 guint obt_keyboard_modkey_to_modmask(ObtModkeysKey key)
 218 {
 219     return modkeys_keys[key];
 220 }
 221
 222 static void set_modkey_mask(guchar mask, KeySym sym)
 223 {
 224     /* find what key this is, and bind it to the mask */
 225
 226     if (sym == XK_Num_Lock)
 227         modkeys_keys[OBT_KEYBOARD_MODKEY_NUMLOCK] |= mask;
 228     else if (sym == XK_Scroll_Lock)
 229         modkeys_keys[OBT_KEYBOARD_MODKEY_SCROLLLOCK] |= mask;
 230
 231     else if (sym == XK_Super_L && super_l)
 232         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] |= mask;
 233     else if (sym == XK_Super_L && !super_l)
 234         /* left takes precident over right, so erase any masks the right
 235            key may have set */
 236         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] = mask, super_l = TRUE;
 237     else if (sym == XK_Super_R && !super_l)
 238         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] |= mask;
 239
 240     else if (sym == XK_Hyper_L && hyper_l)
 241         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] |= mask;
 242     else if (sym == XK_Hyper_L && !hyper_l)
 243         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] = mask, hyper_l = TRUE;
 244     else if (sym == XK_Hyper_R && !hyper_l)
 245         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] |= mask;
 246
 247     else if (sym == XK_Alt_L && alt_l)
 248         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] |= mask;
 249     else if (sym == XK_Alt_L && !alt_l)
 250         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] = mask, alt_l = TRUE;
 251     else if (sym == XK_Alt_R && !alt_l)
 252         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] |= mask;
 253
 254     else if (sym == XK_Meta_L && meta_l)
 255         modkeys_keys[OBT_KEYBOARD_MODKEY_META] |= mask;
 256     else if (sym == XK_Meta_L && !meta_l)
 257         modkeys_keys[OBT_KEYBOARD_MODKEY_META] = mask, meta_l = TRUE;
 258     else if (sym == XK_Meta_R && !meta_l)
 259         modkeys_keys[OBT_KEYBOARD_MODKEY_META] |= mask;
 260
 261     /* CapsLock, Shift, and Control are special and hard-coded */
 262 }
 263
 264 KeyCode* obt_keyboard_keysym_to_keycode(KeySym sym)
 265 {
 266     KeyCode *ret;
 267     gint i, j, n;
 268
 269     ret = g_new(KeyCode, 1);
 270     n = 0;
 271     ret[n] = 0;
 272
 273     /* go through each keycode and look for the keysym */
 274     for (i = min_keycode; i <= max_keycode; ++i)
 275         for (j = 0; j < keysyms_per_keycode; ++j)
 276             if (sym == keymap[(i-min_keycode) * keysyms_per_keycode + j]) {
 277                 ret = g_renew(KeyCode, ret, ++n);
 278                 ret[n-1] = i;
 279                 ret[n] = 0;
 280             }
 281     return ret;
 282 }
 283
 284 gunichar obt_keyboard_keypress_to_unichar(ObtIC *ic, XKeyPressedEvent *ev)
 285 {
 286     gunichar unikey = 0;
 287     KeySym sym;
 288     Status status;
 289     gchar *buf, fixbuf[4]; /* 4 is enough for a utf8 char */
 290     gint len, bufsz;
 291     gboolean got_string = FALSE;
 292
 293     if (!ic)
 294         g_warning("Using obt_keyboard_keypress_to_unichar() without an "
 295                   "Input Context.  No i18n support!");
 296
 297     if (ic && ic->xic) {
 298         buf = fixbuf;
 299         bufsz = sizeof(fixbuf);
 300
 301 #ifdef X_HAVE_UTF8_STRING
 302         len = Xutf8LookupString(ic->xic, ev, buf, bufsz, &sym, &status);
 303 #else
 304         len = XmbLookupString(ic->xic, ev, buf, bufsz, &sym, &status);
 305 #endif
 306
 307         if (status == XBufferOverflow) {
 308             buf = g_new(char, len);
 309             bufsz = len;
 310
 311 #ifdef X_HAVE_UTF8_STRING
 312             len = Xutf8LookupString(ic->xic, ev, buf, bufsz, &sym, &status);
 313 #else
 314             len = XmbLookupString(ic->xic, ev, buf, bufsz, &sym, &status);
 315 #endif
 316         }
 317
 318         if ((status == XLookupChars || status == XLookupBoth)) {
 319             if ((guchar)buf[0] >= 32) { /* not an ascii control character */
 320 #ifndef X_HAVE_UTF8_STRING
 321                 /* convert to utf8 */
 322                 gchar *buf2 = buf;
 323                 buf = g_locale_to_utf8(buf2, r, NULL, NULL, NULL);
 324                 g_free(buf2);
 325 #endif
 326
 327                 got_string = TRUE;
 328             }
 329         }
 330         else
 331             g_message("Bad keycode lookup. Keysym 0x%x Status: %s\n",
 332                       (guint) sym,
 333                       (status == XBufferOverflow ? "BufferOverflow" :
 334                        status == XLookupNone ? "XLookupNone" :
 335                        status == XLookupKeySym ? "XLookupKeySym" :
 336                        "Unknown status"));
 337     }
 338     else {
 339         buf = fixbuf;
 340         bufsz = sizeof(fixbuf);
 341         len = XLookupString(ev, buf, bufsz, &sym, NULL);
 342         if ((guchar)buf[0] >= 32) /* not an ascii control character */
 343             got_string = TRUE;
 344     }
 345
 346     if (got_string) {
 347         gunichar u = g_utf8_get_char_validated(buf, len);
 348         if (u && u != (gunichar)-1 && u != (gunichar)-2)
 349             unikey = u;
 350     }
 351
 352     if (buf != fixbuf) g_free(buf);
 353
 354     return unikey;
 355 }
 356
 357 void obt_keyboard_context_renew(ObtIC *ic)
 358 {
 359     if (ic->xic) {
 360         XDestroyIC(ic->xic);
 361         ic->xic = NULL;
 362     }
 363
 364     if (xim) {
 365         ic->xic = XCreateIC(xim,
 366                             XNInputStyle, xim_style,
 367                             XNClientWindow, ic->client,
 368                             XNFocusWindow, ic->focus,
 369                             NULL);
 370         if (!ic->xic)
 371             g_message("Error creating Input Context for window 0x%x 0x%x\n",
 372                       (guint)ic->client, (guint)ic->focus);
 373     }
 374 }
 375
 376 ObtIC* obt_keyboard_context_new(Window client, Window focus)
 377 {
 378     ObtIC *ic;
 379
 380     g_return_val_if_fail(client != None && focus != None, NULL);
 381
 382     ic = g_new(ObtIC, 1);
 383     ic->ref = 1;
 384     ic->client = client;
 385     ic->focus = focus;
 386     ic->xic = NULL;
 387
 388     obt_keyboard_context_renew(ic);
 389     xic_all = g_slist_prepend(xic_all, ic);
 390
 391     return ic;
 392 }
 393
 394 void obt_keyboard_context_ref(ObtIC *ic)
 395 {
 396     ++ic->ref;
 397 }
 398
 399 void obt_keyboard_context_unref(ObtIC *ic)
 400 {
 401     if (--ic->ref < 1) {
 402         xic_all = g_slist_remove(xic_all, ic);
 403         XDestroyIC(ic->xic);
 404         g_free(ic);
 405     }
 406 }