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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"
#ifndef COMBO_VARIABLE_LEN
__attribute__((weak)) combo_t key_combos[COMBO_COUNT] = {};
#else
extern combo_t key_combos[];
extern int COMBO_LEN;
#endif
__attribute__((weak)) void process_combo_event(uint16_t combo_index, bool pressed) {}
static uint16_t timer = 0;
static uint16_t current_combo_index = 0;
static bool drop_buffer = false;
static bool is_active = false;
static bool b_combo_enable = true; // defaults to enabled
static uint8_t buffer_size = 0;
#ifdef COMBO_ALLOW_ACTION_KEYS
static keyrecord_t key_buffer[MAX_COMBO_LENGTH];
#else
static uint16_t key_buffer[MAX_COMBO_LENGTH];
#endif
static inline void send_combo(uint16_t action, bool pressed) {
if (action) {
if (pressed) {
register_code16(action);
} else {
unregister_code16(action);
}
} else {
process_combo_event(current_combo_index, pressed);
}
}
static inline void dump_key_buffer(bool emit) {
if (buffer_size == 0) {
return;
}
if (emit) {
for (uint8_t i = 0; i < buffer_size; i++) {
#ifdef COMBO_ALLOW_ACTION_KEYS
const action_t action = store_or_get_action(key_buffer[i].event.pressed, key_buffer[i].event.key);
process_action(&(key_buffer[i]), action);
#else
register_code16(key_buffer[i]);
send_keyboard_report();
#endif
}
}
buffer_size = 0;
}
#define ALL_COMBO_KEYS_ARE_DOWN (((1 << count) - 1) == combo->state)
#define KEY_STATE_DOWN(key) \
do { \
combo->state |= (1 << key); \
} while (0)
#define KEY_STATE_UP(key) \
do { \
combo->state &= ~(1 << key); \
} while (0)
static bool process_single_combo(combo_t *combo, uint16_t keycode, keyrecord_t *record) {
uint8_t count = 0;
uint16_t index = -1;
/* Find index of keycode and number of combo keys */
for (const uint16_t *keys = combo->keys;; ++count) {
uint16_t key = pgm_read_word(&keys[count]);
if (keycode == key) index = count;
if (COMBO_END == key) break;
}
/* Continue processing if not a combo key */
if (-1 == (int8_t)index) return false;
bool is_combo_active = is_active;
if (record->event.pressed) {
KEY_STATE_DOWN(index);
if (is_combo_active) {
if (ALL_COMBO_KEYS_ARE_DOWN) { /* Combo was pressed */
send_combo(combo->keycode, true);
drop_buffer = true;
}
}
} else {
if (ALL_COMBO_KEYS_ARE_DOWN) { /* Combo was released */
send_combo(combo->keycode, false);
} else {
/* continue processing without immediately returning */
is_combo_active = false;
}
KEY_STATE_UP(index);
}
return is_combo_active;
}
#define NO_COMBO_KEYS_ARE_DOWN (0 == combo->state)
bool process_combo(uint16_t keycode, keyrecord_t *record) {
bool is_combo_key = false;
drop_buffer = 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;
}
if (!is_combo_enabled()) {
return true;
}
#ifndef COMBO_VARIABLE_LEN
for (current_combo_index = 0; current_combo_index < COMBO_COUNT; ++current_combo_index) {
#else
for (current_combo_index = 0; current_combo_index < COMBO_LEN; ++current_combo_index) {
#endif
combo_t *combo = &key_combos[current_combo_index];
is_combo_key |= process_single_combo(combo, keycode, record);
no_combo_keys_pressed = no_combo_keys_pressed && NO_COMBO_KEYS_ARE_DOWN;
}
if (drop_buffer) {
/* buffer is only dropped when we complete a combo, so we refresh the timer
* here */
timer = timer_read();
dump_key_buffer(false);
} else if (!is_combo_key) {
/* if no combos claim the key we need to emit the keybuffer */
dump_key_buffer(true);
// reset state if there are no combo keys pressed at all
if (no_combo_keys_pressed) {
timer = 0;
is_active = true;
}
} else if (record->event.pressed && is_active) {
/* otherwise the key is consumed and placed in the buffer */
timer = timer_read();
if (buffer_size < MAX_COMBO_LENGTH) {
#ifdef COMBO_ALLOW_ACTION_KEYS
key_buffer[buffer_size++] = *record;
#else
key_buffer[buffer_size++] = keycode;
#endif
}
}
return !is_combo_key;
}
void combo_task(void) {
if (b_combo_enable && is_active && timer && timer_elapsed(timer) > COMBO_TERM) {
/* This disables the combo, meaning key events for this
* combo will be handled by the next processors in the chain
*/
is_active = false;
dump_key_buffer(true);
}
}
void combo_enable(void) { b_combo_enable = true; }
void combo_disable(void) {
b_combo_enable = is_active = false;
timer = 0;
dump_key_buffer(true);
}
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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