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 };
  30
  31 /* These masks are constants and the modifier keys are bound to them as
  32    anyone sees fit:
  33         ShiftMask (1<<0), LockMask (1<<1), ControlMask (1<<2), Mod1Mask (1<<3),
  34         Mod2Mask (1<<4), Mod3Mask (1<<5), Mod4Mask (1<<6), Mod5Mask (1<<7)
  35 */
  36 #define NUM_MASKS 8
  37 #define ALL_MASKS 0xff /* an or'ing of all 8 keyboard masks */
  38
  39 /* Get the bitflag for the n'th modifier mask */
  40 #define nth_mask(n) (1 << n)
  41
  42 static void set_modkey_mask(guchar mask, KeySym sym);
  43 static void xim_init(void);
  44 void obt_keyboard_shutdown();
  45
  46 static XModifierKeymap *modmap;
  47 static KeySym *keymap;
  48 static gint min_keycode, max_keycode, keysyms_per_keycode;
  49 /* This is a bitmask of the different masks for each modifier key */
  50 static guchar modkeys_keys[OBT_KEYBOARD_NUM_MODKEYS];
  51
  52 static gboolean alt_l = FALSE;
  53 static gboolean meta_l = FALSE;
  54 static gboolean super_l = FALSE;
  55 static gboolean hyper_l = FALSE;
  56
  57 static gboolean started = FALSE;
  58
  59 static XIM xim = NULL;
  60 static XIMStyle xim_style = 0;
  61
  62 void obt_keyboard_reload(void)
  63 {
  64     gint i, j, k;
  65
  66     if (started) obt_keyboard_shutdown(); /* free stuff */
  67     started = TRUE;
  68
  69     xim_init();
  70
  71     /* reset the keys to not be bound to any masks */
  72     for (i = 0; i < OBT_KEYBOARD_NUM_MODKEYS; ++i)
  73         modkeys_keys[i] = 0;
  74
  75     modmap = XGetModifierMapping(obt_display);
  76     /* note: modmap->max_keypermod can be 0 when there is no valid key layout
  77        available */
  78
  79     XDisplayKeycodes(obt_display, &min_keycode, &max_keycode);
  80     keymap = XGetKeyboardMapping(obt_display, min_keycode,
  81                                  max_keycode - min_keycode + 1,
  82                                  &keysyms_per_keycode);
  83
  84     alt_l = meta_l = super_l = hyper_l = FALSE;
  85
  86     /* go through each of the modifier masks (eg ShiftMask, CapsMask...) */
  87     for (i = 0; i < NUM_MASKS; ++i) {
  88         /* go through each keycode that is bound to the mask */
  89         for (j = 0; j < modmap->max_keypermod; ++j) {
  90             KeySym sym;
  91             /* get a keycode that is bound to the mask (i) */
  92             KeyCode keycode = modmap->modifiermap[i*modmap->max_keypermod + j];
  93             if (keycode) {
  94                 /* go through each keysym bound to the given keycode */
  95                 for (k = 0; k < keysyms_per_keycode; ++k) {
  96                     sym = keymap[(keycode-min_keycode) * keysyms_per_keycode +
  97                                  k];
  98                     if (sym != NoSymbol) {
  99                         /* bind the key to the mask (e.g. Alt_L => Mod1Mask) */
 100                         set_modkey_mask(nth_mask(i), sym);
 101                     }
 102                 }
 103             }
 104         }
 105     }
 106
 107     /* CapsLock, Shift, and Control are special and hard-coded */
 108     modkeys_keys[OBT_KEYBOARD_MODKEY_CAPSLOCK] = LockMask;
 109     modkeys_keys[OBT_KEYBOARD_MODKEY_SHIFT] = ShiftMask;
 110     modkeys_keys[OBT_KEYBOARD_MODKEY_CONTROL] = ControlMask;
 111 }
 112
 113 void obt_keyboard_shutdown(void)
 114 {
 115     XFreeModifiermap(modmap);
 116     modmap = NULL;
 117     XFree(keymap);
 118     keymap = NULL;
 119     if (xim) XCloseIM(xim);
 120     xim = NULL;
 121     xim_style = 0;
 122     started = FALSE;
 123 }
 124
 125 void xim_init(void)
 126 {
 127     gchar *aname, *aclass;
 128
 129     aname = g_strdup(g_get_prgname());
 130     if (!aname) aname = g_strdup("obt");
 131
 132     aclass = g_strdup(aname);
 133     if (g_ascii_islower(aclass[0]))
 134         aclass[0] = g_ascii_toupper(aclass[0]);
 135
 136     g_print("Opening Input Method for %s %s\n", aname, aclass);
 137     xim = XOpenIM(obt_display, NULL, aname, aclass);
 138
 139     if (!xim)
 140         g_message("Failed to open an Input Method");
 141     else {
 142         XIMStyles *xim_styles = NULL;
 143         char *r;
 144
 145         /* get the input method styles */
 146         r = XGetIMValues(xim, XNQueryInputStyle, &xim_styles, NULL);
 147         if (r || !xim_styles)
 148             g_message("Input Method does not support any styles");
 149         if (xim_styles) {
 150             int i;
 151
 152             /* find a style that doesnt need preedit or status */
 153             for (i = 0; i < xim_styles->count_styles; ++i) {
 154                 if (xim_styles->supported_styles[i] ==
 155                     (XIMPreeditNothing | XIMStatusNothing))
 156                 {
 157                     xim_style = xim_styles->supported_styles[i];
 158                     break;
 159                 }
 160             }
 161             XFree(xim_styles);
 162         }
 163
 164         if (!xim_style) {
 165             g_message("Input Method does not support a usable style");
 166
 167             XCloseIM(xim);
 168             xim = NULL;
 169         }
 170     }
 171
 172     g_free(aclass);
 173     g_free(aname);
 174 }
 175
 176 guint obt_keyboard_keycode_to_modmask(guint keycode)
 177 {
 178     gint i, j;
 179     guint mask = 0;
 180
 181     if (keycode == NoSymbol) return 0;
 182
 183     /* go through each of the modifier masks (eg ShiftMask, CapsMask...) */
 184     for (i = 0; i < NUM_MASKS; ++i) {
 185         /* go through each keycode that is bound to the mask */
 186         for (j = 0; j < modmap->max_keypermod; ++j) {
 187             /* compare with a keycode that is bound to the mask (i) */
 188             if (modmap->modifiermap[i*modmap->max_keypermod + j] == keycode)
 189                 mask |= nth_mask(i);
 190         }
 191     }
 192     return mask;
 193 }
 194
 195 guint obt_keyboard_only_modmasks(guint mask)
 196 {
 197     mask &= ALL_MASKS;
 198     /* strip off these lock keys. they shouldn't affect key bindings */
 199     mask &= ~LockMask; /* use the LockMask, not what capslock is bound to,
 200                           because you could bind it to something else and it
 201                           should work as that modifier then. i think capslock
 202                           is weird in xkb. */
 203     mask &= ~obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_NUMLOCK);
 204     mask &= ~obt_keyboard_modkey_to_modmask(OBT_KEYBOARD_MODKEY_SCROLLLOCK);
 205     return mask;
 206 }
 207
 208 guint obt_keyboard_modkey_to_modmask(ObtModkeysKey key)
 209 {
 210     return modkeys_keys[key];
 211 }
 212
 213 static void set_modkey_mask(guchar mask, KeySym sym)
 214 {
 215     /* find what key this is, and bind it to the mask */
 216
 217     if (sym == XK_Num_Lock)
 218         modkeys_keys[OBT_KEYBOARD_MODKEY_NUMLOCK] |= mask;
 219     else if (sym == XK_Scroll_Lock)
 220         modkeys_keys[OBT_KEYBOARD_MODKEY_SCROLLLOCK] |= mask;
 221
 222     else if (sym == XK_Super_L && super_l)
 223         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] |= mask;
 224     else if (sym == XK_Super_L && !super_l)
 225         /* left takes precident over right, so erase any masks the right
 226            key may have set */
 227         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] = mask, super_l = TRUE;
 228     else if (sym == XK_Super_R && !super_l)
 229         modkeys_keys[OBT_KEYBOARD_MODKEY_SUPER] |= mask;
 230
 231     else if (sym == XK_Hyper_L && hyper_l)
 232         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] |= mask;
 233     else if (sym == XK_Hyper_L && !hyper_l)
 234         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] = mask, hyper_l = TRUE;
 235     else if (sym == XK_Hyper_R && !hyper_l)
 236         modkeys_keys[OBT_KEYBOARD_MODKEY_HYPER] |= mask;
 237
 238     else if (sym == XK_Alt_L && alt_l)
 239         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] |= mask;
 240     else if (sym == XK_Alt_L && !alt_l)
 241         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] = mask, alt_l = TRUE;
 242     else if (sym == XK_Alt_R && !alt_l)
 243         modkeys_keys[OBT_KEYBOARD_MODKEY_ALT] |= mask;
 244
 245     else if (sym == XK_Meta_L && meta_l)
 246         modkeys_keys[OBT_KEYBOARD_MODKEY_META] |= mask;
 247     else if (sym == XK_Meta_L && !meta_l)
 248         modkeys_keys[OBT_KEYBOARD_MODKEY_META] = mask, meta_l = TRUE;
 249     else if (sym == XK_Meta_R && !meta_l)
 250         modkeys_keys[OBT_KEYBOARD_MODKEY_META] |= mask;
 251
 252     /* CapsLock, Shift, and Control are special and hard-coded */
 253 }
 254
 255 KeyCode* obt_keyboard_keysym_to_keycode(KeySym sym)
 256 {
 257     KeyCode *ret;
 258     gint i, j, n;
 259
 260     ret = g_new(KeyCode, 1);
 261     n = 0;
 262     ret[n] = 0;
 263
 264     /* go through each keycode and look for the keysym */
 265     for (i = min_keycode; i <= max_keycode; ++i)
 266         for (j = 0; j < keysyms_per_keycode; ++j)
 267             if (sym == keymap[(i-min_keycode) * keysyms_per_keycode + j]) {
 268                 ret = g_renew(KeyCode, ret, ++n);
 269                 ret[n-1] = i;
 270                 ret[n] = 0;
 271             }
 272     return ret;
 273 }
 274
 275 gchar *obt_keyboard_keycode_to_string(guint keycode)
 276 {
 277     KeySym sym;
 278
 279     if ((sym = XKeycodeToKeysym(obt_display, keycode, 0)) != NoSymbol)
 280         return g_locale_to_utf8(XKeysymToString(sym), -1, NULL, NULL, NULL);
 281     return NULL;
 282 }
 283
 284 gunichar obt_keyboard_keycode_to_unichar(guint keycode)
 285 {
 286     gunichar unikey = 0;
 287     char *key;
 288
 289     if ((key = obt_keyboard_keycode_to_string(keycode)) != NULL &&
 290         /* don't accept keys that aren't a single letter, like "space" */
 291         key[1] == '\0')
 292     {
 293         unikey = g_utf8_get_char_validated(key, -1);
 294         if (unikey == (gunichar)-1 || unikey == (gunichar)-2 || unikey == 0)
 295             unikey = 0;
 296     }
 297     g_free(key);
 298     return unikey;
 299 }
 300
 301 ObtIC* obt_keyboard_context_new(Window w)
 302 {
 303     ObtIC *ic = NULL;
 304
 305     if (w != None) {
 306         ic = g_new(ObtIC, 1);
 307         ic->ref = 1;
 308         ic->xic = NULL;
 309
 310         if (xim)
 311             ic->xic = XCreateIC(xim,
 312                                 XNInputStyle, xim_style,
 313                                 XNClientWindow, w,
 314                                 XNFocusWindow, w,
 315                                 NULL);
 316     }
 317     return ic;
 318 }
 319
 320 void obt_keyboard_context_ref(ObtIC *ic)
 321 {
 322     ++ic->ref;
 323 }
 324
 325 void obt_keyboard_context_unref(ObtIC *ic)
 326 {
 327     if (--ic->ref < 1) {
 328         XDestroyIC(ic->xic);
 329         g_free(ic);
 330     }
 331 }