1 /************************************************************
2 * Copyright (c) 1993 by Silicon Graphics Computer Systems, Inc.
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28 * Copyright © 2012 Intel Corporation
29 * Copyright © 2012 Ran Benita <ran234@gmail.com>
31 * Permission is hereby granted, free of charge, to any person obtaining a
32 * copy of this software and associated documentation files (the "Software"),
33 * to deal in the Software without restriction, including without limitation
34 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
35 * and/or sell copies of the Software, and to permit persons to whom the
36 * Software is furnished to do so, subject to the following conditions:
38 * The above copyright notice and this permission notice (including the next
39 * paragraph) shall be included in all copies or substantial portions of the
42 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
43 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
44 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
45 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
46 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
47 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
48 * DEALINGS IN THE SOFTWARE.
50 * Author: Daniel Stone <daniel@fooishbar.org>
54 * This is a bastardised version of xkbActions.c from the X server which
55 * does not support, for the moment:
56 * - AccessX sticky/debounce/etc (will come later)
57 * - pointer keys (may come later)
58 * - key redirects (unlikely)
59 * - messages (very unlikely)
68 union xkb_action action;
69 const struct xkb_key *key;
71 int (*func)(struct xkb_state *state,
72 struct xkb_filter *filter,
73 const struct xkb_key *key,
74 enum xkb_key_direction direction);
79 xkb_group_index_t base_group; /**< depressed */
80 xkb_group_index_t latched_group;
81 xkb_group_index_t locked_group;
82 xkb_group_index_t group; /**< effective */
84 xkb_mod_mask_t base_mods; /**< depressed */
85 xkb_mod_mask_t latched_mods;
86 xkb_mod_mask_t locked_mods;
87 xkb_mod_mask_t mods; /**< effective */
90 * At each event, we accumulate all the needed modifications to the base
91 * modifiers, and apply them at the end. These keep track of this state.
93 xkb_mod_mask_t set_mods;
94 xkb_mod_mask_t clear_mods;
96 * We mustn't clear a base modifier if there's another depressed key
97 * which affects it, e.g. given this sequence
98 * < Left Shift down, Right Shift down, Left Shift Up >
99 * the modifier should still be set. This keeps the count.
101 int16_t mod_key_count[sizeof(xkb_mod_mask_t) * 8];
106 darray(struct xkb_filter) filters;
107 struct xkb_keymap *keymap;
110 static const union xkb_action fake = { .type = ACTION_TYPE_NONE };
112 static const union xkb_action *
113 xkb_key_get_action(struct xkb_state *state, const struct xkb_key *key)
115 xkb_group_index_t group;
116 xkb_level_index_t level;
121 group = xkb_key_get_group(state, key);
122 if (group == XKB_GROUP_INVALID)
125 level = xkb_key_get_level(state, key, group);
126 if (level == XKB_LEVEL_INVALID)
129 return XkbKeyActionEntry(key, group, level);
132 static struct xkb_filter *
133 xkb_filter_new(struct xkb_state *state)
135 struct xkb_filter *filter = NULL, *iter;
137 darray_foreach(iter, state->filters) {
145 darray_resize0(state->filters, darray_size(state->filters) + 1);
146 filter = &darray_item(state->filters, darray_size(state->filters) -1);
153 /***====================================================================***/
156 xkb_filter_group_set_func(struct xkb_state *state,
157 struct xkb_filter *filter,
158 const struct xkb_key *key,
159 enum xkb_key_direction direction)
161 if (key != filter->key) {
162 filter->action.group.flags &= ~ACTION_LOCK_CLEAR;
166 if (direction == XKB_KEY_DOWN) {
170 else if (--filter->refcnt > 0) {
174 if (filter->action.group.flags & ACTION_ABSOLUTE_SWITCH)
175 state->base_group = filter->action.group.group;
177 state->base_group = -filter->action.group.group;
178 if (filter->action.group.flags & ACTION_LOCK_CLEAR)
179 state->locked_group = 0;
186 xkb_filter_group_set_new(struct xkb_state *state,
187 const struct xkb_key *key,
188 const union xkb_action *action)
190 struct xkb_filter *filter = xkb_filter_new(state);
195 filter->func = xkb_filter_group_set_func;
196 filter->action = *action;
198 if (action->group.flags & ACTION_ABSOLUTE_SWITCH) {
199 filter->action.group.group = state->base_group;
200 state->base_group = action->group.group;
203 state->base_group += action->group.group;
210 xkb_filter_group_lock_func(struct xkb_state *state,
211 struct xkb_filter *filter,
212 const struct xkb_key *key,
213 enum xkb_key_direction direction)
215 if (key != filter->key)
218 if (direction == XKB_KEY_DOWN) {
222 if (--filter->refcnt > 0)
230 xkb_filter_group_lock_new(struct xkb_state *state,
231 const struct xkb_key *key,
232 const union xkb_action *action)
234 struct xkb_filter *filter = xkb_filter_new(state);
239 filter->func = xkb_filter_group_lock_func;
240 filter->action = *action;
242 if (action->group.flags & ACTION_ABSOLUTE_SWITCH)
243 state->locked_group = action->group.group;
245 state->locked_group += action->group.group;
251 xkb_filter_mod_set_func(struct xkb_state *state,
252 struct xkb_filter *filter,
253 const struct xkb_key *key,
254 enum xkb_key_direction direction)
256 if (key != filter->key) {
257 filter->action.mods.flags &= ~ACTION_LOCK_CLEAR;
261 if (direction == XKB_KEY_DOWN) {
265 else if (--filter->refcnt > 0) {
269 state->clear_mods = filter->action.mods.mods.mask;
270 if (filter->action.mods.flags & ACTION_LOCK_CLEAR)
271 state->locked_mods &= ~filter->action.mods.mods.mask;
278 xkb_filter_mod_set_new(struct xkb_state *state,
279 const struct xkb_key *key,
280 const union xkb_action *action)
282 struct xkb_filter *filter = xkb_filter_new(state);
287 filter->func = xkb_filter_mod_set_func;
288 filter->action = *action;
290 state->set_mods = action->mods.mods.mask;
296 xkb_filter_mod_lock_func(struct xkb_state *state,
297 struct xkb_filter *filter,
298 const struct xkb_key *key,
299 enum xkb_key_direction direction)
301 if (key != filter->key)
304 if (direction == XKB_KEY_DOWN) {
308 if (--filter->refcnt > 0)
311 state->locked_mods &= ~filter->priv;
318 xkb_filter_mod_lock_new(struct xkb_state *state,
319 const struct xkb_key *key,
320 const union xkb_action *action)
322 struct xkb_filter *filter = xkb_filter_new(state);
327 filter->func = xkb_filter_mod_lock_func;
328 filter->action = *action;
329 filter->priv = state->locked_mods & action->mods.mods.mask;
331 state->locked_mods |= action->mods.mods.mask;
336 enum xkb_key_latch_state {
343 xkb_action_breaks_latch(const union xkb_action *action)
345 switch (action->type) {
346 case ACTION_TYPE_NONE:
347 case ACTION_TYPE_PTR_BUTTON:
348 case ACTION_TYPE_PTR_LOCK:
349 case ACTION_TYPE_CTRL_SET:
350 case ACTION_TYPE_CTRL_LOCK:
351 case ACTION_TYPE_KEY_REDIRECT:
352 case ACTION_TYPE_SWITCH_VT:
353 case ACTION_TYPE_TERMINATE:
361 xkb_filter_mod_latch_func(struct xkb_state *state,
362 struct xkb_filter *filter,
363 const struct xkb_key *key,
364 enum xkb_key_direction direction)
366 enum xkb_key_latch_state latch = filter->priv;
368 if (direction == XKB_KEY_DOWN && latch == LATCH_PENDING) {
369 /* If this is a new keypress and we're awaiting our single latched
370 * keypress, then either break the latch if any random key is pressed,
371 * or promote it to a lock or plain base set if it's the same
373 const union xkb_action *action = xkb_key_get_action(state, key);
374 if (action->type == ACTION_TYPE_MOD_LATCH &&
375 action->mods.flags == filter->action.mods.flags &&
376 action->mods.mods.mask == filter->action.mods.mods.mask) {
377 filter->action = *action;
378 if (filter->action.mods.flags & ACTION_LATCH_TO_LOCK) {
379 filter->action.type = ACTION_TYPE_MOD_LOCK;
380 filter->func = xkb_filter_mod_lock_func;
381 state->locked_mods |= filter->action.mods.mods.mask;
384 filter->action.type = ACTION_TYPE_MOD_SET;
385 filter->func = xkb_filter_mod_set_func;
386 state->set_mods = filter->action.mods.mods.mask;
389 state->latched_mods &= ~filter->action.mods.mods.mask;
393 else if (xkb_action_breaks_latch(action)) {
394 /* XXX: This may be totally broken, we might need to break the
395 * latch in the next run after this press? */
396 state->latched_mods &= ~filter->action.mods.mods.mask;
401 else if (direction == XKB_KEY_UP && key == filter->key) {
402 /* Our key got released. If we've set it to clear locks, and we
403 * currently have the same modifiers locked, then release them and
404 * don't actually latch. Else we've actually hit the latching
405 * stage, so set PENDING and move our modifier from base to
407 if (latch == NO_LATCH ||
408 ((filter->action.mods.flags & ACTION_LOCK_CLEAR) &&
409 (state->locked_mods & filter->action.mods.mods.mask) ==
410 filter->action.mods.mods.mask)) {
411 /* XXX: We might be a bit overenthusiastic about clearing
412 * mods other filters have set here? */
413 if (latch == LATCH_PENDING)
414 state->latched_mods &= ~filter->action.mods.mods.mask;
416 state->clear_mods = filter->action.mods.mods.mask;
417 state->locked_mods &= ~filter->action.mods.mods.mask;
421 latch = LATCH_PENDING;
422 state->clear_mods = filter->action.mods.mods.mask;
423 state->latched_mods |= filter->action.mods.mods.mask;
427 else if (direction == XKB_KEY_DOWN && latch == LATCH_KEY_DOWN) {
428 /* Someone's pressed another key while we've still got the latching
429 * key held down, so keep the base modifier state active (from
430 * xkb_filter_mod_latch_new), but don't trip the latch, just clear
431 * it as soon as the modifier gets released. */
435 filter->priv = latch;
441 xkb_filter_mod_latch_new(struct xkb_state *state,
442 const struct xkb_key *key,
443 const union xkb_action *action)
445 enum xkb_key_latch_state latch = LATCH_KEY_DOWN;
446 struct xkb_filter *filter = xkb_filter_new(state);
451 filter->priv = latch;
452 filter->func = xkb_filter_mod_latch_func;
453 filter->action = *action;
455 state->set_mods = action->mods.mods.mask;
461 * Applies any relevant filters to the key, first from the list of filters
462 * that are currently active, then if no filter has claimed the key, possibly
463 * apply a new filter from the key action.
466 xkb_filter_apply_all(struct xkb_state *state,
467 const struct xkb_key *key,
468 enum xkb_key_direction direction)
470 struct xkb_filter *filter;
471 const union xkb_action *act = NULL;
474 /* First run through all the currently active filters and see if any of
475 * them have claimed this event. */
476 darray_foreach(filter, state->filters) {
479 send &= filter->func(state, filter, key, direction);
482 if (!send || direction == XKB_KEY_UP)
485 act = xkb_key_get_action(state, key);
487 case ACTION_TYPE_MOD_SET:
488 send = xkb_filter_mod_set_new(state, key, act);
490 case ACTION_TYPE_MOD_LATCH:
491 send = xkb_filter_mod_latch_new(state, key, act);
493 case ACTION_TYPE_MOD_LOCK:
494 send = xkb_filter_mod_lock_new(state, key, act);
496 case ACTION_TYPE_GROUP_SET:
497 send = xkb_filter_group_set_new(state, key, act);
500 case ACTION_TYPE_GROUP_LATCH:
501 send = xkb_filter_mod_latch_new(state, key, act);
504 case ACTION_TYPE_GROUP_LOCK:
505 send = xkb_filter_group_lock_new(state, key, act);
514 XKB_EXPORT struct xkb_state *
515 xkb_state_new(struct xkb_keymap *keymap)
517 struct xkb_state *ret;
519 ret = calloc(sizeof(*ret), 1);
524 ret->keymap = xkb_map_ref(keymap);
529 XKB_EXPORT struct xkb_state *
530 xkb_state_ref(struct xkb_state *state)
537 xkb_state_unref(struct xkb_state *state)
539 if (--state->refcnt > 0)
542 xkb_map_unref(state->keymap);
543 darray_free(state->filters);
547 XKB_EXPORT struct xkb_keymap *
548 xkb_state_get_map(struct xkb_state *state)
550 return state->keymap;
554 * Update the LED state to match the rest of the xkb_state.
557 xkb_state_led_update_all(struct xkb_state *state)
563 for (led = 0; led < XKB_NUM_INDICATORS; led++) {
564 struct xkb_indicator_map *map = &state->keymap->indicators[led];
565 xkb_mod_mask_t mod_mask = 0;
566 uint32_t group_mask = 0;
568 if (map->which_mods & XKB_STATE_DEPRESSED)
569 mod_mask |= state->base_mods;
570 if (map->which_mods & XKB_STATE_LATCHED)
571 mod_mask |= state->latched_mods;
572 if (map->which_mods & XKB_STATE_LOCKED)
573 mod_mask |= state->locked_mods;
574 if ((map->mods.mask & mod_mask))
575 state->leds |= (1 << led);
577 if (map->which_groups & XKB_STATE_DEPRESSED)
578 group_mask |= (1 << state->base_group);
579 if (map->which_groups & XKB_STATE_LATCHED)
580 group_mask |= (1 << state->latched_group);
581 if (map->which_groups & XKB_STATE_LOCKED)
582 group_mask |= (1 << state->locked_group);
583 if ((map->groups & group_mask))
584 state->leds |= (1 << led);
587 if ((map->ctrls & state->keymap->enabled_ctrls))
588 state->leds |= (1 << led);
594 * Calculates the derived state (effective mods/group and LEDs) from an
595 * up-to-date xkb_state.
598 xkb_state_update_derived(struct xkb_state *state)
601 (state->base_mods | state->latched_mods | state->locked_mods);
602 /* FIXME: Clamp/wrap locked_group */
603 state->group = state->locked_group + state->base_group +
604 state->latched_group;
605 /* FIXME: Clamp/wrap effective group */
607 xkb_state_led_update_all(state);
611 * Given a particular key event, updates the state structure to reflect the
615 xkb_state_update_key(struct xkb_state *state, xkb_keycode_t kc,
616 enum xkb_key_direction direction)
620 const struct xkb_key *key = XkbKey(state->keymap, kc);
625 state->clear_mods = 0;
627 xkb_filter_apply_all(state, key, direction);
629 for (i = 0, bit = 1; state->set_mods; i++, bit <<= 1) {
630 if (state->set_mods & bit) {
631 state->mod_key_count[i]++;
632 state->base_mods |= bit;
633 state->set_mods &= ~bit;
637 for (i = 0, bit = 1; state->clear_mods; i++, bit <<= 1) {
638 if (state->clear_mods & bit) {
639 state->mod_key_count[i]--;
640 if (state->mod_key_count[i] <= 0) {
641 state->base_mods &= ~bit;
642 state->mod_key_count[i] = 0;
644 state->clear_mods &= ~bit;
648 xkb_state_update_derived(state);
652 * Updates the state from a set of explicit masks as gained from
653 * xkb_state_serialize_mods and xkb_state_serialize_groups. As noted in the
654 * documentation for these functions in xkbcommon.h, this round-trip is
655 * lossy, and should only be used to update a slave state mirroring the
656 * master, e.g. in a client/server window system.
659 xkb_state_update_mask(struct xkb_state *state,
660 xkb_mod_mask_t base_mods,
661 xkb_mod_mask_t latched_mods,
662 xkb_mod_mask_t locked_mods,
663 xkb_group_index_t base_group,
664 xkb_group_index_t latched_group,
665 xkb_group_index_t locked_group)
667 xkb_mod_index_t num_mods;
670 state->base_mods = 0;
671 state->latched_mods = 0;
672 state->locked_mods = 0;
673 num_mods = xkb_map_num_mods(state->keymap);
675 for (idx = 0; idx < num_mods; idx++) {
676 xkb_mod_mask_t mod = (1 << idx);
678 state->base_mods |= mod;
679 if (latched_mods & mod)
680 state->latched_mods |= mod;
681 if (locked_mods & mod)
682 state->locked_mods |= mod;
685 state->base_group = base_group;
686 state->latched_group = latched_group;
687 state->locked_group = locked_group;
689 xkb_state_update_derived(state);
693 * Serialises the requested modifier state into an xkb_mod_mask_t, with all
694 * the same disclaimers as in xkb_state_update_mask.
696 XKB_EXPORT xkb_mod_mask_t
697 xkb_state_serialize_mods(struct xkb_state *state,
698 enum xkb_state_component type)
700 xkb_mod_mask_t ret = 0;
702 if (type == XKB_STATE_EFFECTIVE)
705 if (type & XKB_STATE_DEPRESSED)
706 ret |= state->base_mods;
707 if (type & XKB_STATE_LATCHED)
708 ret |= state->latched_mods;
709 if (type & XKB_STATE_LOCKED)
710 ret |= state->locked_mods;
716 * Serialises the requested group state, with all the same disclaimers as
717 * in xkb_state_update_mask.
719 XKB_EXPORT xkb_group_index_t
720 xkb_state_serialize_group(struct xkb_state *state,
721 enum xkb_state_component type)
723 xkb_group_index_t ret = 0;
725 if (type == XKB_STATE_EFFECTIVE)
728 if (type & XKB_STATE_DEPRESSED)
729 ret += state->base_group;
730 if (type & XKB_STATE_LATCHED)
731 ret += state->latched_group;
732 if (type & XKB_STATE_LOCKED)
733 ret += state->locked_group;
739 * Returns 1 if the given modifier is active with the specified type(s), 0 if
740 * not, or -1 if the modifier is invalid.
743 xkb_state_mod_index_is_active(struct xkb_state *state,
745 enum xkb_state_component type)
749 if (idx >= xkb_map_num_mods(state->keymap))
752 if (type & XKB_STATE_DEPRESSED)
753 ret |= (state->base_mods & (1 << idx));
754 if (type & XKB_STATE_LATCHED)
755 ret |= (state->latched_mods & (1 << idx));
756 if (type & XKB_STATE_LOCKED)
757 ret |= (state->locked_mods & (1 << idx));
763 * Helper function for xkb_state_mod_indices_are_active and
764 * xkb_state_mod_names_are_active.
767 match_mod_masks(struct xkb_state *state, enum xkb_state_match match,
770 uint32_t active = xkb_state_serialize_mods(state, XKB_STATE_EFFECTIVE);
772 if (!(match & XKB_STATE_MATCH_NON_EXCLUSIVE) && (active & ~wanted))
775 if (match & XKB_STATE_MATCH_ANY)
776 return !!(active & wanted);
778 return (active & wanted) == wanted;
784 * Returns 1 if the modifiers are active with the specified type(s), 0 if
785 * not, or -1 if any of the modifiers are invalid.
788 xkb_state_mod_indices_are_active(struct xkb_state *state,
789 enum xkb_state_component type,
790 enum xkb_state_match match,
794 xkb_mod_index_t idx = 0;
797 xkb_mod_index_t num_mods = xkb_map_num_mods(state->keymap);
801 idx = va_arg(ap, xkb_mod_index_t);
802 if (idx == XKB_MOD_INVALID)
804 if (idx >= num_mods) {
808 wanted |= (1 << idx);
815 return match_mod_masks(state, match, wanted);
819 * Returns 1 if the given modifier is active with the specified type(s), 0 if
820 * not, or -1 if the modifier is invalid.
823 xkb_state_mod_name_is_active(struct xkb_state *state, const char *name,
824 enum xkb_state_component type)
826 xkb_mod_index_t idx = xkb_map_mod_get_index(state->keymap, name);
828 if (idx == XKB_MOD_INVALID)
831 return xkb_state_mod_index_is_active(state, idx, type);
835 * Returns 1 if the modifiers are active with the specified type(s), 0 if
836 * not, or -1 if any of the modifiers are invalid.
838 XKB_EXPORT ATTR_NULL_SENTINEL int
839 xkb_state_mod_names_are_active(struct xkb_state *state,
840 enum xkb_state_component type,
841 enum xkb_state_match match,
845 xkb_mod_index_t idx = 0;
852 str = va_arg(ap, const char *);
855 idx = xkb_map_mod_get_index(state->keymap, str);
856 if (idx == XKB_MOD_INVALID) {
860 wanted |= (1 << idx);
867 return match_mod_masks(state, match, wanted);
871 * Returns 1 if the given group is active with the specified type(s), 0 if
872 * not, or -1 if the group is invalid.
875 xkb_state_group_index_is_active(struct xkb_state *state,
876 xkb_group_index_t idx,
877 enum xkb_state_component type)
881 if (idx >= xkb_map_num_groups(state->keymap))
884 if (type & XKB_STATE_DEPRESSED)
885 ret |= (state->base_group == idx);
886 if (type & XKB_STATE_LATCHED)
887 ret |= (state->latched_group == idx);
888 if (type & XKB_STATE_LOCKED)
889 ret |= (state->locked_group == idx);
895 * Returns 1 if the given modifier is active with the specified type(s), 0 if
896 * not, or -1 if the modifier is invalid.
899 xkb_state_group_name_is_active(struct xkb_state *state, const char *name,
900 enum xkb_state_component type)
902 xkb_group_index_t idx = xkb_map_group_get_index(state->keymap, name);
904 if (idx == XKB_GROUP_INVALID)
907 return xkb_state_group_index_is_active(state, idx, type);
911 * Returns 1 if the given LED is active, 0 if not, or -1 if the LED is invalid.
914 xkb_state_led_index_is_active(struct xkb_state *state, xkb_led_index_t idx)
916 if (idx >= xkb_map_num_leds(state->keymap))
919 return !!(state->leds & (1 << idx));
923 * Returns 1 if the given LED is active, 0 if not, or -1 if the LED is invalid.
926 xkb_state_led_name_is_active(struct xkb_state *state, const char *name)
928 xkb_led_index_t idx = xkb_map_led_get_index(state->keymap, name);
930 if (idx == XKB_LED_INVALID)
933 return xkb_state_led_index_is_active(state, idx);