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fix combo enabling logic (#5610)
[qmk_firmware.git] / quantum / process_keycode / process_combo.c
1 /* Copyright 2016 Jack Humbert
2  *
3  * This program is free software: you can redistribute it and/or modify
4  * it under the terms of the GNU General Public License as published by
5  * the Free Software Foundation, either version 2 of the License, or
6  * (at your option) any later version.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15  */
16
17 #include "print.h"
18 #include "process_combo.h"
19
20 __attribute__((weak)) combo_t key_combos[COMBO_COUNT] = {
21
22 };
23
24 __attribute__((weak)) void process_combo_event(uint8_t combo_index,
25                                                bool pressed) {}
26
27 static uint16_t timer = 0;
28 static uint8_t current_combo_index = 0;
29 static bool drop_buffer = false;
30 static bool is_active = false;
31
32 static uint8_t buffer_size = 0;
33 #ifdef COMBO_ALLOW_ACTION_KEYS
34 static keyrecord_t key_buffer[MAX_COMBO_LENGTH];
35 #else
36 static uint16_t key_buffer[MAX_COMBO_LENGTH];
37 #endif
38
39 static inline void send_combo(uint16_t action, bool pressed) {
40   if (action) {
41     if (pressed) {
42       register_code16(action);
43     } else {
44       unregister_code16(action);
45     }
46   } else {
47     process_combo_event(current_combo_index, pressed);
48   }
49 }
50
51 static inline void dump_key_buffer(bool emit) {
52   if (buffer_size == 0) {
53     return;
54   }
55
56   if (emit) {
57     for (uint8_t i = 0; i < buffer_size; i++) {
58 #ifdef COMBO_ALLOW_ACTION_KEYS
59       const action_t action = store_or_get_action(key_buffer[i].event.pressed,
60                                                   key_buffer[i].event.key);
61       process_action(&(key_buffer[i]), action);
62 #else
63       register_code16(key_buffer[i]);
64       send_keyboard_report();
65 #endif
66     }
67   }
68
69   buffer_size = 0;
70 }
71
72 #define ALL_COMBO_KEYS_ARE_DOWN (((1 << count) - 1) == combo->state)
73 #define KEY_STATE_DOWN(key)                                                    \
74   do {                                                                         \
75     combo->state |= (1 << key);                                                \
76   } while (0)
77 #define KEY_STATE_UP(key)                                                      \
78   do {                                                                         \
79     combo->state &= ~(1 << key);                                               \
80   } while (0)
81
82 static bool process_single_combo(combo_t *combo, uint16_t keycode,
83                                  keyrecord_t *record) {
84   uint8_t count = 0;
85   uint8_t index = -1;
86   /* Find index of keycode and number of combo keys */
87   for (const uint16_t *keys = combo->keys;; ++count) {
88     uint16_t key = pgm_read_word(&keys[count]);
89     if (keycode == key)
90       index = count;
91     if (COMBO_END == key)
92       break;
93   }
94
95   /* Continue processing if not a combo key */
96   if (-1 == (int8_t)index)
97     return false;
98
99   bool is_combo_active = is_active;
100
101   if (record->event.pressed) {
102     KEY_STATE_DOWN(index);
103
104     if (is_combo_active) {
105       if (ALL_COMBO_KEYS_ARE_DOWN) { /* Combo was pressed */
106         send_combo(combo->keycode, true);
107         drop_buffer = true;
108       }
109     }
110   } else {
111     if (ALL_COMBO_KEYS_ARE_DOWN) { /* Combo was released */
112       send_combo(combo->keycode, false);
113     } else {
114       /* continue processing without immediately returning */
115       is_combo_active = false;
116     }
117
118     KEY_STATE_UP(index);
119   }
120
121   return is_combo_active;
122 }
123
124 #define NO_COMBO_KEYS_ARE_DOWN (0 == combo->state)
125
126 bool process_combo(uint16_t keycode, keyrecord_t *record) {
127   bool is_combo_key = false;
128   drop_buffer = false;
129   bool no_combo_keys_pressed = true;
130
131   for (current_combo_index = 0; current_combo_index < COMBO_COUNT;
132        ++current_combo_index) {
133     combo_t *combo = &key_combos[current_combo_index];
134     is_combo_key |= process_single_combo(combo, keycode, record);
135     no_combo_keys_pressed = no_combo_keys_pressed && NO_COMBO_KEYS_ARE_DOWN;
136   }
137
138   if (drop_buffer) {
139     /* buffer is only dropped when we complete a combo, so we refresh the timer
140      * here */
141     timer = timer_read();
142     dump_key_buffer(false);
143   } else if (!is_combo_key) {
144     /* if no combos claim the key we need to emit the keybuffer */
145     dump_key_buffer(true);
146
147     // reset state if there are no combo keys pressed at all
148     if (no_combo_keys_pressed) {
149       timer = 0;
150       is_active = true;
151     }
152   } else if (record->event.pressed && is_active) {
153     /* otherwise the key is consumed and placed in the buffer */
154     timer = timer_read();
155
156     if (buffer_size < MAX_COMBO_LENGTH) {
157 #ifdef COMBO_ALLOW_ACTION_KEYS
158       key_buffer[buffer_size++] = *record;
159 #else
160       key_buffer[buffer_size++] = keycode;
161 #endif
162     }
163   }
164
165   return !is_combo_key;
166 }
167
168 void matrix_scan_combo(void) {
169   if (is_active && timer && timer_elapsed(timer) > COMBO_TERM) {
170
171     /* This disables the combo, meaning key events for this
172      * combo will be handled by the next processors in the chain
173      */
174     is_active = false;
175     dump_key_buffer(true);
176   }
177 }