1 /************************************************************
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28 * Copyright © 2012 Intel Corporation
30 * Permission is hereby granted, free of charge, to any person obtaining a
31 * copy of this software and associated documentation files (the "Software"),
32 * to deal in the Software without restriction, including without limitation
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42 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
43 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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47 * DEALINGS IN THE SOFTWARE.
49 * Author: Daniel Stone <daniel@fooishbar.org>
53 * This is a bastardised version of xkbActions.c from the X server which
54 * does not support, for the moment:
55 * - AccessX sticky/debounce/etc (will come later)
56 * - pointer keys (may come later)
57 * - key redirects (unlikely)
58 * - messages (very unlikely)
67 struct xkb_state *state;
68 union xkb_action action;
71 int (*func)(struct xkb_filter *filter, xkb_keycode_t kc,
72 enum xkb_key_direction direction);
74 struct xkb_filter *next;
78 xkb_group_index_t base_group; /**< depressed */
79 xkb_group_index_t latched_group;
80 xkb_group_index_t locked_group;
81 xkb_group_index_t group; /**< effective */
83 xkb_mod_mask_t base_mods; /**< depressed */
84 xkb_mod_mask_t latched_mods;
85 xkb_mod_mask_t locked_mods;
86 xkb_mod_mask_t mods; /**< effective */
89 * At each event, we accumulate all the needed modifications to the base
90 * modifiers, and apply them at the end. These keep track of this state.
92 xkb_mod_mask_t set_mods;
93 xkb_mod_mask_t clear_mods;
95 * We mustn't clear a base modifier if there's another depressed key
96 * which affects it, e.g. given this sequence
97 * < Left Shift down, Right Shift down, Left Shift Up >
98 * the modifier should still be set. This keeps the count.
100 int16_t mod_key_count[sizeof(xkb_mod_mask_t) * 8];
105 darray(struct xkb_filter) filters;
106 struct xkb_keymap *keymap;
109 static union xkb_action *
110 xkb_key_get_action(struct xkb_state *state, xkb_keycode_t kc)
112 xkb_group_index_t group;
114 struct xkb_key *key = NULL;
116 if (XkbKeycodeInRange(state->keymap, kc))
117 key = XkbKey(state->keymap, kc);
119 if (!key || !XkbKeyHasActions(key)) {
120 static union xkb_action fake;
121 memset(&fake, 0, sizeof(fake));
122 fake.type = XkbSA_NoAction;
126 group = xkb_key_get_group(state, kc);
127 level = xkb_key_get_level(state, kc, group);
129 return XkbKeyActionEntry(state->keymap, key, group, level);
132 static struct xkb_filter *
133 xkb_filter_new(struct xkb_state *state)
135 int old_size = darray_size(state->filters);
136 struct xkb_filter *filter = NULL, *iter;
138 darray_foreach(iter, state->filters) {
146 darray_resize0(state->filters, darray_size(state->filters) + 1);
147 filter = &darray_item(state->filters, old_size);
150 filter->state = state;
155 /***====================================================================***/
158 xkb_filter_group_set_func(struct xkb_filter *filter, xkb_keycode_t kc,
159 enum xkb_key_direction direction)
161 if (kc != filter->kc) {
162 filter->action.group.flags &= ~XkbSA_ClearLocks;
166 if (direction == XKB_KEY_DOWN) {
170 else if (--filter->refcnt > 0) {
174 if (filter->action.group.flags & XkbSA_GroupAbsolute)
175 filter->state->base_group = filter->action.group.group;
177 filter->state->base_group = -filter->action.group.group;
178 if (filter->action.group.flags & XkbSA_ClearLocks)
179 filter->state->locked_group = 0;
187 xkb_filter_group_set_new(struct xkb_state *state, xkb_keycode_t kc,
188 union xkb_action *action)
190 struct xkb_filter *filter = xkb_filter_new(state);
192 if (!filter) /* WSGO */
195 filter->func = xkb_filter_group_set_func;
196 filter->action = *action;
198 if (action->group.flags & XkbSA_GroupAbsolute) {
199 filter->action.group.group = filter->state->base_group;
200 filter->state->base_group = action->group.group;
203 filter->state->base_group += action->group.group;
210 xkb_filter_group_lock_func(struct xkb_filter *filter, xkb_keycode_t kc,
211 enum xkb_key_direction direction)
213 if (kc != filter->kc)
216 if (direction == XKB_KEY_DOWN) {
220 if (--filter->refcnt > 0)
228 xkb_filter_group_lock_new(struct xkb_state *state, xkb_keycode_t kc,
229 union xkb_action *action)
231 struct xkb_filter *filter = xkb_filter_new(state);
237 filter->func = xkb_filter_group_lock_func;
238 filter->action = *action;
240 if (action->group.flags & XkbSA_GroupAbsolute)
241 filter->state->locked_group = action->group.group;
243 filter->state->locked_group += action->group.group;
249 xkb_filter_mod_set_func(struct xkb_filter *filter, xkb_keycode_t kc,
250 enum xkb_key_direction direction)
252 if (kc != filter->kc) {
253 filter->action.mods.flags &= ~XkbSA_ClearLocks;
257 if (direction == XKB_KEY_DOWN) {
261 else if (--filter->refcnt > 0) {
265 filter->state->clear_mods = filter->action.mods.mask;
266 if (filter->action.mods.flags & XkbSA_ClearLocks)
267 filter->state->locked_mods &= ~filter->action.mods.mask;
275 xkb_filter_mod_set_new(struct xkb_state *state, xkb_keycode_t kc,
276 union xkb_action *action)
278 struct xkb_filter *filter = xkb_filter_new(state);
280 if (!filter) /* WSGO */
283 filter->func = xkb_filter_mod_set_func;
284 filter->action = *action;
286 filter->state->set_mods = action->mods.mask;
292 xkb_filter_mod_lock_func(struct xkb_filter *filter, xkb_keycode_t kc,
293 enum xkb_key_direction direction)
295 if (kc != filter->kc)
298 if (direction == XKB_KEY_DOWN) {
302 if (--filter->refcnt > 0)
305 filter->state->locked_mods &= ~filter->priv;
311 xkb_filter_mod_lock_new(struct xkb_state *state, xkb_keycode_t kc,
312 union xkb_action *action)
314 struct xkb_filter *filter = xkb_filter_new(state);
316 if (!filter) /* WSGO */
320 filter->func = xkb_filter_mod_lock_func;
321 filter->action = *action;
322 filter->priv = state->locked_mods & action->mods.mask;
323 state->locked_mods |= action->mods.mask;
328 enum xkb_key_latch_state {
335 xkb_filter_mod_latch_func(struct xkb_filter *filter, xkb_keycode_t kc,
336 enum xkb_key_direction direction)
338 enum xkb_key_latch_state latch = filter->priv;
340 if (direction == XKB_KEY_DOWN && latch == LATCH_PENDING) {
341 /* If this is a new keypress and we're awaiting our single latched
342 * keypress, then either break the latch if any random key is pressed,
343 * or promote it to a lock or plain base set if it's the same
345 union xkb_action *action = xkb_key_get_action(filter->state, kc);
346 if (action->type == XkbSA_LatchMods &&
347 action->mods.flags == filter->action.mods.flags &&
348 action->mods.mask == filter->action.mods.mask) {
349 filter->action = *action;
350 if (filter->action.mods.flags & XkbSA_LatchToLock) {
351 filter->action.type = XkbSA_LockMods;
352 filter->func = xkb_filter_mod_lock_func;
353 filter->state->locked_mods |= filter->action.mods.mask;
356 filter->action.type = XkbSA_SetMods;
357 filter->func = xkb_filter_mod_set_func;
358 filter->state->set_mods = filter->action.mods.mask;
361 filter->state->latched_mods &= ~filter->action.mods.mask;
365 else if (((1 << action->type) & XkbSA_BreakLatch)) {
366 /* XXX: This may be totally broken, we might need to break the
367 * latch in the next run after this press? */
368 filter->state->latched_mods &= ~filter->action.mods.mask;
373 else if (direction == XKB_KEY_UP && kc == filter->kc) {
374 /* Our key got released. If we've set it to clear locks, and we
375 * currently have the same modifiers locked, then release them and
376 * don't actually latch. Else we've actually hit the latching
377 * stage, so set PENDING and move our modifier from base to
379 if (latch == NO_LATCH ||
380 ((filter->action.mods.flags & XkbSA_ClearLocks) &&
381 (filter->state->locked_mods & filter->action.mods.mask) ==
382 filter->action.mods.mask)) {
383 /* XXX: We might be a bit overenthusiastic about clearing
384 * mods other filters have set here? */
385 if (latch == LATCH_PENDING)
386 filter->state->latched_mods &= ~filter->action.mods.mask;
388 filter->state->clear_mods = filter->action.mods.mask;
389 filter->state->locked_mods &= ~filter->action.mods.mask;
393 latch = LATCH_PENDING;
394 filter->state->clear_mods = filter->action.mods.mask;
395 filter->state->latched_mods |= filter->action.mods.mask;
399 else if (direction == XKB_KEY_DOWN && latch == LATCH_KEY_DOWN) {
400 /* Someone's pressed another key while we've still got the latching
401 * key held down, so keep the base modifier state active (from
402 * xkb_filter_mod_latch_new), but don't trip the latch, just clear
403 * it as soon as the modifier gets released. */
407 filter->priv = latch;
413 xkb_filter_mod_latch_new(struct xkb_state *state, xkb_keycode_t kc,
414 union xkb_action *action)
416 struct xkb_filter *filter = xkb_filter_new(state);
417 enum xkb_key_latch_state latch = LATCH_KEY_DOWN;
419 if (!filter) /* WSGO */
422 filter->priv = latch;
423 filter->func = xkb_filter_mod_latch_func;
424 filter->action = *action;
426 filter->state->set_mods = action->mods.mask;
432 * Applies any relevant filters to the key, first from the list of filters
433 * that are currently active, then if no filter has claimed the key, possibly
434 * apply a new filter from the key action.
437 xkb_filter_apply_all(struct xkb_state *state, xkb_keycode_t kc,
438 enum xkb_key_direction direction)
440 struct xkb_filter *filter;
441 union xkb_action *act = NULL;
444 /* First run through all the currently active filters and see if any of
445 * them have claimed this event. */
446 darray_foreach(filter, state->filters) {
449 send &= filter->func(filter, kc, direction);
452 if (!send || direction == XKB_KEY_UP)
455 act = xkb_key_get_action(state, kc);
458 send = xkb_filter_mod_set_new(state, kc, act);
460 case XkbSA_LatchMods:
461 send = xkb_filter_mod_latch_new(state, kc, act);
464 send = xkb_filter_mod_lock_new(state, kc, act);
467 send = xkb_filter_group_set_new(state, kc, act);
470 case XkbSA_LatchGroup:
471 send = xkb_filter_mod_latch_new(state, key, act);
474 case XkbSA_LockGroup:
475 send = xkb_filter_group_lock_new(state, kc, act);
482 XKB_EXPORT struct xkb_state *
483 xkb_state_new(struct xkb_keymap *keymap)
485 struct xkb_state *ret;
490 ret = calloc(sizeof(*ret), 1);
495 ret->keymap = xkb_map_ref(keymap);
500 XKB_EXPORT struct xkb_state *
501 xkb_state_ref(struct xkb_state *state)
508 xkb_state_unref(struct xkb_state *state)
511 assert(state->refcnt >= 0);
512 if (state->refcnt > 0)
515 xkb_map_unref(state->keymap);
516 darray_free(state->filters);
520 XKB_EXPORT struct xkb_keymap *
521 xkb_state_get_map(struct xkb_state *state)
523 return state->keymap;
527 * Update the LED state to match the rest of the xkb_state.
530 xkb_state_led_update_all(struct xkb_state *state)
536 for (led = 0; led < XkbNumIndicators; led++) {
537 struct xkb_indicator_map *map = &state->keymap->indicators[led];
538 uint32_t mod_mask = 0;
539 uint32_t group_mask = 0;
541 if (!map->which_mods && !map->which_groups && !map->ctrls)
544 if (map->which_mods) {
545 if (map->which_mods & XkbIM_UseBase)
546 mod_mask |= state->base_mods;
547 if (map->which_mods & XkbIM_UseLatched)
548 mod_mask |= state->latched_mods;
549 if (map->which_mods & XkbIM_UseLocked)
550 mod_mask |= state->locked_mods;
551 if (map->which_mods & XkbIM_UseEffective)
552 mod_mask |= state->mods;
553 if ((map->mods.mask & mod_mask))
554 state->leds |= (1 << led);
556 else if (map->which_groups) {
557 if (map->which_mods & XkbIM_UseBase)
558 group_mask |= (1 << state->base_group);
559 if (map->which_mods & XkbIM_UseLatched)
560 group_mask |= (1 << state->latched_group);
561 if (map->which_mods & XkbIM_UseLocked)
562 group_mask |= (1 << state->locked_group);
563 if (map->which_mods & XkbIM_UseEffective)
564 group_mask |= (1 << state->group);
565 if ((map->groups & group_mask))
566 state->leds |= (1 << led);
568 else if (map->ctrls) {
569 if ((map->ctrls & state->keymap->enabled_ctrls))
570 state->leds |= (1 << led);
576 * Calculates the derived state (effective mods/group and LEDs) from an
577 * up-to-date xkb_state.
580 xkb_state_update_derived(struct xkb_state *state)
583 (state->base_mods | state->latched_mods | state->locked_mods);
584 /* FIXME: Clamp/wrap locked_group */
585 state->group = state->locked_group + state->base_group +
586 state->latched_group;
587 /* FIXME: Clamp/wrap effective group */
589 xkb_state_led_update_all(state);
593 * Given a particular key event, updates the state structure to reflect the
597 xkb_state_update_key(struct xkb_state *state, xkb_keycode_t kc,
598 enum xkb_key_direction direction)
604 state->clear_mods = 0;
606 xkb_filter_apply_all(state, kc, direction);
608 for (i = 0, bit = 1; state->set_mods; i++, bit <<= 1) {
609 if (state->set_mods & bit) {
610 state->mod_key_count[i]++;
611 state->base_mods |= bit;
612 state->set_mods &= ~bit;
616 for (i = 0, bit = 1; state->clear_mods; i++, bit <<= 1) {
617 if (state->clear_mods & bit) {
618 state->mod_key_count[i]--;
619 if (state->mod_key_count[i] <= 0) {
620 state->base_mods &= ~bit;
621 state->mod_key_count[i] = 0;
623 state->clear_mods &= ~bit;
627 xkb_state_update_derived(state);
631 * Updates the state from a set of explicit masks as gained from
632 * xkb_state_serialize_mods and xkb_state_serialize_groups. As noted in the
633 * documentation for these functions in xkbcommon.h, this round-trip is
634 * lossy, and should only be used to update a slave state mirroring the
635 * master, e.g. in a client/server window system.
638 xkb_state_update_mask(struct xkb_state *state,
639 xkb_mod_mask_t base_mods,
640 xkb_mod_mask_t latched_mods,
641 xkb_mod_mask_t locked_mods,
642 xkb_group_index_t base_group,
643 xkb_group_index_t latched_group,
644 xkb_group_index_t locked_group)
648 state->base_mods = 0;
649 state->latched_mods = 0;
650 state->locked_mods = 0;
651 for (mod = 0; mod < xkb_map_num_mods(state->keymap); mod++) {
652 xkb_mod_mask_t idx = (1 << mod);
654 state->base_mods |= idx;
655 if (latched_mods & idx)
656 state->latched_mods |= idx;
657 if (locked_mods & idx)
658 state->locked_mods |= idx;
661 state->base_group = base_group;
662 state->latched_group = latched_group;
663 state->locked_group = locked_group;
665 xkb_state_update_derived(state);
669 * Serialises the requested modifier state into an xkb_mod_mask_t, with all
670 * the same disclaimers as in xkb_state_update_mask.
672 XKB_EXPORT xkb_mod_mask_t
673 xkb_state_serialize_mods(struct xkb_state *state,
674 enum xkb_state_component type)
676 xkb_mod_mask_t ret = 0;
678 if (type == XKB_STATE_EFFECTIVE)
681 if (type & XKB_STATE_DEPRESSED)
682 ret |= state->base_mods;
683 if (type & XKB_STATE_LATCHED)
684 ret |= state->latched_mods;
685 if (type & XKB_STATE_LOCKED)
686 ret |= state->locked_mods;
692 * Serialises the requested group state, with all the same disclaimers as
693 * in xkb_state_update_mask.
695 XKB_EXPORT xkb_group_index_t
696 xkb_state_serialize_group(struct xkb_state *state,
697 enum xkb_state_component type)
699 xkb_group_index_t ret = 0;
701 if (type == XKB_STATE_EFFECTIVE)
704 if (type & XKB_STATE_DEPRESSED)
705 ret += state->base_group;
706 if (type & XKB_STATE_LATCHED)
707 ret += state->latched_group;
708 if (type & XKB_STATE_LOCKED)
709 ret += state->locked_group;
715 * Returns 1 if the given modifier is active with the specified type(s), 0 if
716 * not, or -1 if the modifier is invalid.
719 xkb_state_mod_index_is_active(struct xkb_state *state,
721 enum xkb_state_component type)
725 if (idx >= xkb_map_num_mods(state->keymap))
728 if (type & XKB_STATE_DEPRESSED)
729 ret |= (state->base_mods & (1 << idx));
730 if (type & XKB_STATE_LATCHED)
731 ret |= (state->latched_mods & (1 << idx));
732 if (type & XKB_STATE_LOCKED)
733 ret |= (state->locked_mods & (1 << idx));
739 * Helper function for xkb_state_mod_indices_are_active and
740 * xkb_state_mod_names_are_active.
743 match_mod_masks(struct xkb_state *state, enum xkb_state_match match,
746 uint32_t active = xkb_state_serialize_mods(state, XKB_STATE_EFFECTIVE);
748 if (!(match & XKB_STATE_MATCH_NON_EXCLUSIVE) && (active & ~wanted))
751 if (match & XKB_STATE_MATCH_ANY)
752 return !!(active & wanted);
754 return (active & wanted) == wanted;
760 * Returns 1 if the modifiers are active with the specified type(s), 0 if
761 * not, or -1 if any of the modifiers are invalid.
764 xkb_state_mod_indices_are_active(struct xkb_state *state,
765 enum xkb_state_component type,
766 enum xkb_state_match match,
770 xkb_mod_index_t idx = 0;
776 idx = va_arg(ap, xkb_mod_index_t);
777 if (idx == XKB_MOD_INVALID ||
778 idx >= xkb_map_num_mods(state->keymap)) {
782 wanted |= (1 << idx);
789 return match_mod_masks(state, match, wanted);
793 * Returns 1 if the given modifier is active with the specified type(s), 0 if
794 * not, or -1 if the modifier is invalid.
797 xkb_state_mod_name_is_active(struct xkb_state *state, const char *name,
798 enum xkb_state_component type)
800 xkb_mod_index_t idx = xkb_map_mod_get_index(state->keymap, name);
802 if (idx == XKB_MOD_INVALID)
805 return xkb_state_mod_index_is_active(state, idx, type);
809 * Returns 1 if the modifiers are active with the specified type(s), 0 if
810 * not, or -1 if any of the modifiers are invalid.
813 xkb_state_mod_names_are_active(struct xkb_state *state,
814 enum xkb_state_component type,
815 enum xkb_state_match match,
819 xkb_mod_index_t idx = 0;
826 str = va_arg(ap, const char *);
829 idx = xkb_map_mod_get_index(state->keymap, str);
830 if (idx == XKB_MOD_INVALID) {
834 wanted |= (1 << idx);
841 return match_mod_masks(state, match, wanted);
845 * Returns 1 if the given group is active with the specified type(s), 0 if
846 * not, or -1 if the group is invalid.
849 xkb_state_group_index_is_active(struct xkb_state *state,
850 xkb_group_index_t idx,
851 enum xkb_state_component type)
855 if (idx >= xkb_map_num_groups(state->keymap))
858 if (type & XKB_STATE_DEPRESSED)
859 ret |= (state->base_group == idx);
860 if (type & XKB_STATE_LATCHED)
861 ret |= (state->latched_group == idx);
862 if (type & XKB_STATE_LOCKED)
863 ret |= (state->locked_group == idx);
869 * Returns 1 if the given modifier is active with the specified type(s), 0 if
870 * not, or -1 if the modifier is invalid.
873 xkb_state_group_name_is_active(struct xkb_state *state, const char *name,
874 enum xkb_state_component type)
876 xkb_group_index_t idx = xkb_map_group_get_index(state->keymap, name);
878 if (idx == XKB_GROUP_INVALID)
881 return xkb_state_group_index_is_active(state, idx, type);
885 * Returns 1 if the given LED is active, 0 if not, or -1 if the LED is invalid.
888 xkb_state_led_index_is_active(struct xkb_state *state, xkb_led_index_t idx)
890 if (idx >= xkb_map_num_leds(state->keymap))
893 return !!(state->leds & (1 << idx));
897 * Returns 1 if the given LED is active, 0 if not, or -1 if the LED is invalid.
900 xkb_state_led_name_is_active(struct xkb_state *state, const char *name)
902 xkb_led_index_t idx = xkb_map_led_get_index(state->keymap, name);
904 if (idx == XKB_LED_INVALID)
907 return xkb_state_led_index_is_active(state, idx);