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qmk_firmware/quantum/process_keycode/process_combo.c

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/* Copyright 2016 Jack Humbert
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "print.h"
#include "process_combo.h"
#include "action_tapping.h"
#ifdef COMBO_COUNT
__attribute__((weak)) combo_t key_combos[COMBO_COUNT];
uint16_t COMBO_LEN = COMBO_COUNT;
#else
extern combo_t key_combos[];
extern uint16_t COMBO_LEN;
#endif
__attribute__((weak)) void process_combo_event(uint16_t combo_index, bool pressed) {}
#ifdef COMBO_MUST_HOLD_PER_COMBO
__attribute__((weak)) bool get_combo_must_hold(uint16_t index, combo_t *combo) { return false; }
#endif
#ifdef COMBO_MUST_TAP_PER_COMBO
__attribute__((weak)) bool get_combo_must_tap(uint16_t index, combo_t *combo) { return false; }
#endif
#ifdef COMBO_TERM_PER_COMBO
__attribute__((weak)) uint16_t get_combo_term(uint16_t index, combo_t *combo) { return COMBO_TERM; }
#endif
#ifdef COMBO_MUST_PRESS_IN_ORDER_PER_COMBO
__attribute__((weak)) bool get_combo_must_press_in_order(uint16_t combo_index, combo_t *combo) { return true; }
#endif
#ifdef COMBO_PROCESS_KEY_RELEASE
__attribute__((weak)) bool process_combo_key_release(uint16_t combo_index, combo_t *combo, uint8_t key_index, uint16_t keycode) { return false; }
#endif
#ifdef COMBO_SHOULD_TRIGGER
__attribute__((weak)) bool combo_should_trigger(uint16_t combo_index, combo_t *combo, uint16_t keycode, keyrecord_t *record) { return true; }
#endif
#ifndef COMBO_NO_TIMER
static uint16_t timer = 0;
#endif
static bool b_combo_enable = true; // defaults to enabled
static uint16_t longest_term = 0;
typedef struct {
keyrecord_t record;
uint16_t combo_index;
uint16_t keycode;
} queued_record_t;
static uint8_t key_buffer_size = 0;
static queued_record_t key_buffer[COMBO_KEY_BUFFER_LENGTH];
typedef struct {
uint16_t combo_index;
} queued_combo_t;
static uint8_t combo_buffer_write = 0;
static uint8_t combo_buffer_read = 0;
static queued_combo_t combo_buffer[COMBO_BUFFER_LENGTH];
#define INCREMENT_MOD(i) i = (i + 1) % COMBO_BUFFER_LENGTH
#define COMBO_KEY_POS ((keypos_t){.col = 254, .row = 254})
#ifndef EXTRA_SHORT_COMBOS
/* flags are their own elements in combo_t struct. */
# define COMBO_ACTIVE(combo) (combo->active)
# define COMBO_DISABLED(combo) (combo->disabled)
# define COMBO_STATE(combo) (combo->state)
# define ACTIVATE_COMBO(combo) \
do { \
combo->active = true; \
} while (0)
# define DEACTIVATE_COMBO(combo) \
do { \
combo->active = false; \
} while (0)
# define DISABLE_COMBO(combo) \
do { \
combo->disabled = true; \
} while (0)
# define RESET_COMBO_STATE(combo) \
do { \
combo->disabled = false; \
combo->state = 0; \
} while (0)
#else
/* flags are at the two high bits of state. */
# define COMBO_ACTIVE(combo) (combo->state & 0x80)
# define COMBO_DISABLED(combo) (combo->state & 0x40)
# define COMBO_STATE(combo) (combo->state & 0x3F)
# define ACTIVATE_COMBO(combo) \
do { \
combo->state |= 0x80; \
} while (0)
# define DEACTIVATE_COMBO(combo) \
do { \
combo->state &= ~0x80; \
} while (0)
# define DISABLE_COMBO(combo) \
do { \
combo->state |= 0x40; \
} while (0)
# define RESET_COMBO_STATE(combo) \
do { \
combo->state &= ~0x7F; \
} while (0)
#endif
static inline void release_combo(uint16_t combo_index, combo_t *combo) {
if (combo->keycode) {
keyrecord_t record = {
.event =
{
.key = COMBO_KEY_POS,
.time = timer_read() | 1,
.pressed = false,
},
.keycode = combo->keycode,
};
#ifndef NO_ACTION_TAPPING
action_tapping_process(record);
#else
process_record(&record);
#endif
} else {
process_combo_event(combo_index, false);
}
DEACTIVATE_COMBO(combo);
}
static inline bool _get_combo_must_hold(uint16_t combo_index, combo_t *combo) {
#ifdef COMBO_NO_TIMER
return false;
#elif defined(COMBO_MUST_HOLD_PER_COMBO)
return get_combo_must_hold(combo_index, combo);
#elif defined(COMBO_MUST_HOLD_MODS)
return (KEYCODE_IS_MOD(combo->keycode) || (combo->keycode >= QK_MOMENTARY && combo->keycode <= QK_MOMENTARY_MAX));
#endif
return false;
}
static inline uint16_t _get_wait_time(uint16_t combo_index, combo_t *combo) {
if (_get_combo_must_hold(combo_index, combo)
#ifdef COMBO_MUST_TAP_PER_COMBO
|| get_combo_must_tap(combo_index, combo)
#endif
) {
if (longest_term < COMBO_HOLD_TERM) {
return COMBO_HOLD_TERM;
}
}
return longest_term;
}
static inline uint16_t _get_combo_term(uint16_t combo_index, combo_t *combo) {
#if defined(COMBO_TERM_PER_COMBO)
return get_combo_term(combo_index, combo);
#endif
return COMBO_TERM;
}
void clear_combos(void) {
uint16_t index = 0;
longest_term = 0;
for (index = 0; index < COMBO_LEN; ++index) {
combo_t *combo = &key_combos[index];
if (!COMBO_ACTIVE(combo)) {
RESET_COMBO_STATE(combo);
}
}
}
static inline void dump_key_buffer(void) {
/* First call start from 0 index; recursive calls need to start from i+1 index */
static uint8_t key_buffer_next = 0;
if (key_buffer_size == 0) {
return;
}
for (uint8_t key_buffer_i = key_buffer_next; key_buffer_i < key_buffer_size; key_buffer_i++) {
key_buffer_next = key_buffer_i + 1;
queued_record_t *qrecord = &key_buffer[key_buffer_i];
keyrecord_t * record = &qrecord->record;
if (IS_NOEVENT(record->event)) {
continue;
}
if (!record->keycode && qrecord->combo_index != (uint16_t)-1) {
process_combo_event(qrecord->combo_index, true);
} else {
#ifndef NO_ACTION_TAPPING
action_tapping_process(*record);
#else
process_record(record);
#endif
}
record->event.time = 0;
}
key_buffer_next = key_buffer_size = 0;
}
#define NO_COMBO_KEYS_ARE_DOWN (0 == COMBO_STATE(combo))
#define ALL_COMBO_KEYS_ARE_DOWN(state, key_count) (((1 << key_count) - 1) == state)
#define ONLY_ONE_KEY_IS_DOWN(state) !(state & (state - 1))
#define KEY_NOT_YET_RELEASED(state, key_index) ((1 << key_index) & state)
#define KEY_STATE_DOWN(state, key_index) \
do { \
state |= (1 << key_index); \
} while (0)
#define KEY_STATE_UP(state, key_index) \
do { \
state &= ~(1 << key_index); \
} while (0)
static inline void _find_key_index_and_count(const uint16_t *keys, uint16_t keycode, uint16_t *key_index, uint8_t *key_count) {
while (true) {
uint16_t key = pgm_read_word(&keys[*key_count]);
if (keycode == key) *key_index = *key_count;
if (COMBO_END == key) break;
(*key_count)++;
}
}
void drop_combo_from_buffer(uint16_t combo_index) {
/* Mark a combo as processed from the buffer. If the buffer is in the
* beginning of the buffer, drop it. */
uint8_t i = combo_buffer_read;
while (i != combo_buffer_write) {
queued_combo_t *qcombo = &combo_buffer[i];
if (qcombo->combo_index == combo_index) {
combo_t *combo = &key_combos[combo_index];
DISABLE_COMBO(combo);
if (i == combo_buffer_read) {
INCREMENT_MOD(combo_buffer_read);
}
break;
}
INCREMENT_MOD(i);
}
}
void apply_combo(uint16_t combo_index, combo_t *combo) {
/* Apply combo's result keycode to the last chord key of the combo and
* disable the other keys. */
if (COMBO_DISABLED(combo)) {
return;
}
// state to check against so we find the last key of the combo from the buffer
#if defined(EXTRA_EXTRA_LONG_COMBOS)
uint32_t state = 0;
#elif defined(EXTRA_LONG_COMBOS)
uint16_t state = 0;
#else
uint8_t state = 0;
#endif
for (uint8_t key_buffer_i = 0; key_buffer_i < key_buffer_size; key_buffer_i++) {
queued_record_t *qrecord = &key_buffer[key_buffer_i];
keyrecord_t * record = &qrecord->record;
uint16_t keycode = qrecord->keycode;
uint8_t key_count = 0;
uint16_t key_index = -1;
_find_key_index_and_count(combo->keys, keycode, &key_index, &key_count);
if (-1 == (int16_t)key_index) {
// key not part of this combo
continue;
}
KEY_STATE_DOWN(state, key_index);
if (ALL_COMBO_KEYS_ARE_DOWN(state, key_count)) {
// this in the end executes the combo when the key_buffer is dumped.
record->keycode = combo->keycode;
record->event.key = COMBO_KEY_POS;
qrecord->combo_index = combo_index;
ACTIVATE_COMBO(combo);
break;
} else {
// key was part of the combo but not the last one, "disable" it
// by making it a TICK event.
record->event.time = 0;
}
}
drop_combo_from_buffer(combo_index);
}
static inline void apply_combos(void) {
// Apply all buffered normal combos.
for (uint8_t i = combo_buffer_read; i != combo_buffer_write; INCREMENT_MOD(i)) {
queued_combo_t *buffered_combo = &combo_buffer[i];
combo_t * combo = &key_combos[buffered_combo->combo_index];
#ifdef COMBO_MUST_TAP_PER_COMBO
if (get_combo_must_tap(buffered_combo->combo_index, combo)) {
// Tap-only combos are applied on key release only, so let's drop 'em here.
drop_combo_from_buffer(buffered_combo->combo_index);
continue;
}
#endif
apply_combo(buffered_combo->combo_index, combo);
}
dump_key_buffer();
clear_combos();
}
combo_t *overlaps(combo_t *combo1, combo_t *combo2) {
/* Checks if the combos overlap and returns the combo that should be
* dropped from the combo buffer.
* The combo that has less keys will be dropped. If they have the same
* amount of keys, drop combo1. */
uint8_t idx1 = 0, idx2 = 0;
uint16_t key1, key2;
bool overlaps = false;
while ((key1 = pgm_read_word(&combo1->keys[idx1])) != COMBO_END) {
idx2 = 0;
while ((key2 = pgm_read_word(&combo2->keys[idx2])) != COMBO_END) {
if (key1 == key2) overlaps = true;
idx2 += 1;
}
idx1 += 1;
}
if (!overlaps) return NULL;
if (idx2 < idx1) return combo2;
return combo1;
}
#if defined(COMBO_MUST_PRESS_IN_ORDER) || defined(COMBO_MUST_PRESS_IN_ORDER_PER_COMBO)
static bool keys_pressed_in_order(uint16_t combo_index, combo_t *combo, uint16_t key_index, uint16_t keycode, keyrecord_t *record) {
# ifdef COMBO_MUST_PRESS_IN_ORDER_PER_COMBO
if (!get_combo_must_press_in_order(combo_index, combo)) {
return true;
}
# endif
if (
// The `state` bit for the key being pressed.
(1 << key_index) ==
// The *next* combo key's bit.
(COMBO_STATE(combo) + 1)
// E.g. two keys already pressed: `state == 11`.
// Next possible `state` is `111`.
// So the needed bit is `100` which we get with `11 + 1`.
) {
return true;
}
return false;
}
#endif
static bool process_single_combo(combo_t *combo, uint16_t keycode, keyrecord_t *record, uint16_t combo_index) {
uint8_t key_count = 0;
uint16_t key_index = -1;
_find_key_index_and_count(combo->keys, keycode, &key_index, &key_count);
/* Continue processing if key isn't part of current combo. */
if (-1 == (int16_t)key_index) {
return false;
}
bool key_is_part_of_combo = (!COMBO_DISABLED(combo) && is_combo_enabled()
#if defined(COMBO_MUST_PRESS_IN_ORDER) || defined(COMBO_MUST_PRESS_IN_ORDER_PER_COMBO)
&& keys_pressed_in_order(combo_index, combo, key_index, keycode, record)
#endif
#ifdef COMBO_SHOULD_TRIGGER
&& combo_should_trigger(combo_index, combo, keycode, record)
#endif
);
if (record->event.pressed && key_is_part_of_combo) {
uint16_t time = _get_combo_term(combo_index, combo);
if (!COMBO_ACTIVE(combo)) {
KEY_STATE_DOWN(combo->state, key_index);
if (longest_term < time) {
longest_term = time;
}
}
if (ALL_COMBO_KEYS_ARE_DOWN(COMBO_STATE(combo), key_count)) {
/* Combo was fully pressed */
/* Buffer the combo so we can fire it after COMBO_TERM */
#ifndef COMBO_NO_TIMER
/* Don't buffer this combo if its combo term has passed. */
if (timer && timer_elapsed(timer) > time) {
DISABLE_COMBO(combo);
return true;
} else
#endif
{
// disable readied combos that overlap with this combo
combo_t *drop = NULL;
for (uint8_t combo_buffer_i = combo_buffer_read; combo_buffer_i != combo_buffer_write; INCREMENT_MOD(combo_buffer_i)) {
queued_combo_t *qcombo = &combo_buffer[combo_buffer_i];
combo_t * buffered_combo = &key_combos[qcombo->combo_index];
if ((drop = overlaps(buffered_combo, combo))) {
DISABLE_COMBO(drop);
if (drop == combo) {
// stop checking for overlaps if dropped combo was current combo.
break;
} else if (combo_buffer_i == combo_buffer_read && drop == buffered_combo) {
/* Drop the disabled buffered combo from the buffer if
* it is in the beginning of the buffer. */
INCREMENT_MOD(combo_buffer_read);
}
}
}
if (drop != combo) {
// save this combo to buffer
combo_buffer[combo_buffer_write] = (queued_combo_t){
.combo_index = combo_index,
};
INCREMENT_MOD(combo_buffer_write);
// get possible longer waiting time for tap-/hold-only combos.
longest_term = _get_wait_time(combo_index, combo);
}
} // if timer elapsed end
}
} else {
// chord releases
if (!COMBO_ACTIVE(combo) && ALL_COMBO_KEYS_ARE_DOWN(COMBO_STATE(combo), key_count)) {
/* First key quickly released */
if (COMBO_DISABLED(combo) || _get_combo_must_hold(combo_index, combo)) {
// combo wasn't tappable, disable it and drop it from buffer.
drop_combo_from_buffer(combo_index);
key_is_part_of_combo = false;
}
#ifdef COMBO_MUST_TAP_PER_COMBO
else if (get_combo_must_tap(combo_index, combo)) {
// immediately apply tap-only combo
apply_combo(combo_index, combo);
apply_combos(); // also apply other prepared combos and dump key buffer
# ifdef COMBO_PROCESS_KEY_RELEASE
if (process_combo_key_release(combo_index, combo, key_index, keycode)) {
release_combo(combo_index, combo);
}
# endif
}
#endif
} else if (COMBO_ACTIVE(combo) && ONLY_ONE_KEY_IS_DOWN(COMBO_STATE(combo)) && KEY_NOT_YET_RELEASED(COMBO_STATE(combo), key_index)) {
/* last key released */
release_combo(combo_index, combo);
key_is_part_of_combo = true;
#ifdef COMBO_PROCESS_KEY_RELEASE
process_combo_key_release(combo_index, combo, key_index, keycode);
#endif
} else if (COMBO_ACTIVE(combo) && KEY_NOT_YET_RELEASED(COMBO_STATE(combo), key_index)) {
/* first or middle key released */
key_is_part_of_combo = true;
#ifdef COMBO_PROCESS_KEY_RELEASE
if (process_combo_key_release(combo_index, combo, key_index, keycode)) {
release_combo(combo_index, combo);
}
#endif
} else {
/* The released key was part of an incomplete combo */
key_is_part_of_combo = false;
}
KEY_STATE_UP(combo->state, key_index);
}
return key_is_part_of_combo;
}
bool process_combo(uint16_t keycode, keyrecord_t *record) {
bool is_combo_key = false;
bool no_combo_keys_pressed = true;
if (keycode == CMB_ON && record->event.pressed) {
combo_enable();
return true;
}
if (keycode == CMB_OFF && record->event.pressed) {
combo_disable();
return true;
}
if (keycode == CMB_TOG && record->event.pressed) {
combo_toggle();
return true;
}
#ifdef COMBO_ONLY_FROM_LAYER
/* Only check keycodes from one layer. */
keycode = keymap_key_to_keycode(COMBO_ONLY_FROM_LAYER, record->event.key);
#endif
for (uint16_t idx = 0; idx < COMBO_LEN; ++idx) {
combo_t *combo = &key_combos[idx];
is_combo_key |= process_single_combo(combo, keycode, record, idx);
no_combo_keys_pressed = no_combo_keys_pressed && (NO_COMBO_KEYS_ARE_DOWN || COMBO_ACTIVE(combo) || COMBO_DISABLED(combo));
}
if (record->event.pressed && is_combo_key) {
#ifndef COMBO_NO_TIMER
# ifdef COMBO_STRICT_TIMER
if (!timer) {
// timer is set only on the first key
timer = timer_read();
}
# else
timer = timer_read();
# endif
#endif
if (key_buffer_size < COMBO_KEY_BUFFER_LENGTH) {
key_buffer[key_buffer_size++] = (queued_record_t){
.record = *record,
.keycode = keycode,
.combo_index = -1, // this will be set when applying combos
};
}
} else {
if (combo_buffer_read != combo_buffer_write) {
// some combo is prepared
apply_combos();
} else {
// reset state if there are no combo keys pressed at all
dump_key_buffer();
#ifndef COMBO_NO_TIMER
timer = 0;
#endif
clear_combos();
}
}
return !is_combo_key;
}
void combo_task(void) {
if (!b_combo_enable) {
return;
}
#ifndef COMBO_NO_TIMER
if (timer && timer_elapsed(timer) > longest_term) {
if (combo_buffer_read != combo_buffer_write) {
apply_combos();
longest_term = 0;
timer = 0;
} else {
dump_key_buffer();
timer = 0;
clear_combos();
}
}
#endif
}
void combo_enable(void) { b_combo_enable = true; }
void combo_disable(void) {
#ifndef COMBO_NO_TIMER
timer = 0;
#endif
b_combo_enable = false;
combo_buffer_read = combo_buffer_write;
clear_combos();
dump_key_buffer();
}
void combo_toggle(void) {
if (b_combo_enable) {
combo_disable();
} else {
combo_enable();
}
}
bool is_combo_enabled(void) { return b_combo_enable; }
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