summaryrefslogtreecommitdiffstats
path: root/tmk_core/common/action_tapping.c
blob: 3b67ed152f798f47778824d674d4328385183976 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
#include <stdint.h>
#include <stdbool.h>
#include "action.h"
#include "action_layer.h"
#include "action_tapping.h"
#include "keycode.h"
#include "timer.h"

#ifdef DEBUG_ACTION
#include "debug.h"
#else
#include "nodebug.h"
#endif

#ifndef NO_ACTION_TAPPING

#define IS_TAPPING()            !IS_NOEVENT(tapping_key.event)
#define IS_TAPPING_PRESSED()    (IS_TAPPING() && tapping_key.event.pressed)
#define IS_TAPPING_RELEASED()   (IS_TAPPING() && !tapping_key.event.pressed)
#define IS_TAPPING_KEY(k)       (IS_TAPPING() && KEYEQ(tapping_key.event.key, (k)))

__attribute__ ((weak))
uint16_t get_tapping_term(uint16_t keycode) {
  return TAPPING_TERM;
}

#ifdef TAPPING_TERM_PER_KEY
#define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < get_tapping_term(get_event_keycode(tapping_key.event)))
#else
#define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < TAPPING_TERM)
#endif

static keyrecord_t tapping_key = {};
static keyrecord_t waiting_buffer[WAITING_BUFFER_SIZE] = {};
static uint8_t waiting_buffer_head = 0;
static uint8_t waiting_buffer_tail = 0;

static bool process_tapping(keyrecord_t *record);
static bool waiting_buffer_enq(keyrecord_t record);
static void waiting_buffer_clear(void);
static bool waiting_buffer_typed(keyevent_t event);
static bool waiting_buffer_has_anykey_pressed(void);
static void waiting_buffer_scan_tap(void);
static void debug_tapping_key(void);
static void debug_waiting_buffer(void);


/** \brief Action Tapping Process
 *
 * FIXME: Needs doc
 */
void action_tapping_process(keyrecord_t record)
{
    if (process_tapping(&record)) {
        if (!IS_NOEVENT(record.event)) {
            debug("processed: "); debug_record(record); debug("\n");
        }
    } else {
        if (!waiting_buffer_enq(record)) {
            // clear all in case of overflow.
            debug("OVERFLOW: CLEAR ALL STATES\n");
            clear_keyboard();
            waiting_buffer_clear();
            tapping_key = (keyrecord_t){};
        }
    }

    // process waiting_buffer
    if (!IS_NOEVENT(record.event) && waiting_buffer_head != waiting_buffer_tail) {
        debug("---- action_exec: process waiting_buffer -----\n");
    }
    for (; waiting_buffer_tail != waiting_buffer_head; waiting_buffer_tail = (waiting_buffer_tail + 1) % WAITING_BUFFER_SIZE) {
        if (process_tapping(&waiting_buffer[waiting_buffer_tail])) {
            debug("processed: waiting_buffer["); debug_dec(waiting_buffer_tail); debug("] = ");
            debug_record(waiting_buffer[waiting_buffer_tail]); debug("\n\n");
        } else {
            break;
        }
    }
    if (!IS_NOEVENT(record.event)) {
        debug("\n");
    }
}


/** \brief Tapping
 *
 * Rule: Tap key is typed(pressed and released) within TAPPING_TERM.
 *       (without interfering by typing other key)
 */
/* return true when key event is processed or consumed. */
bool process_tapping(keyrecord_t *keyp)
{
    keyevent_t event = keyp->event;

    // if tapping
    if (IS_TAPPING_PRESSED()) {
        if (WITHIN_TAPPING_TERM(event)) {
            if (tapping_key.tap.count == 0) {
                if (IS_TAPPING_KEY(event.key) && !event.pressed) {
                    // first tap!
                    debug("Tapping: First tap(0->1).\n");
                    tapping_key.tap.count = 1;
                    debug_tapping_key();
                    process_record(&tapping_key);

                    // copy tapping state
                    keyp->tap = tapping_key.tap;
                    // enqueue
                    return false;
                }
                /* Process a key typed within TAPPING_TERM
                 * This can register the key before settlement of tapping,
                 * useful for long TAPPING_TERM but may prevent fast typing.
                 */
#if defined(TAPPING_TERM_PER_KEY) || (!defined(PER_KEY_TAPPING_TERM) && TAPPING_TERM >= 500) || defined(PERMISSIVE_HOLD)
#ifdef TAPPING_TERM_PER_KEY
                else if ( ( get_tapping_term(get_event_keycode(tapping_key.event)) >= 500) && IS_RELEASED(event) && waiting_buffer_typed(event))
#else
                else if ( IS_RELEASED(event) && waiting_buffer_typed(event))
#endif
                {
                    debug("Tapping: End. No tap. Interfered by typing key\n");
                    process_record(&tapping_key);
                    tapping_key = (keyrecord_t){};
                    debug_tapping_key();
                    // enqueue
                    return false;
                }
#endif
                /* Process release event of a key pressed before tapping starts
                 * Without this unexpected repeating will occur with having fast repeating setting
                 * https://github.com/tmk/tmk_keyboard/issues/60
                 */
                else if (IS_RELEASED(event) && !waiting_buffer_typed(event)) {
                    // Modifier should be retained till end of this tapping.
                    action_t action = layer_switch_get_action(event.key);
                    switch (action.kind.id) {
                        case ACT_LMODS:
                        case ACT_RMODS:
                            if (action.key.mods && !action.key.code) return false;
                            if (IS_MOD(action.key.code)) return false;
                            break;
                        case ACT_LMODS_TAP:
                        case ACT_RMODS_TAP:
                            if (action.key.mods && keyp->tap.count == 0) return false;
                            if (IS_MOD(action.key.code)) return false;
                            break;
                    }
                    // Release of key should be process immediately.
                    debug("Tapping: release event of a key pressed before tapping\n");
                    process_record(keyp);
                    return true;
                }
                else {
                    // set interrupted flag when other key preesed during tapping
                    if (event.pressed) {
                        tapping_key.tap.interrupted = true;
                    }
                    // enqueue
                    return false;
                }
            }
            // tap_count > 0
            else {
                if (IS_TAPPING_KEY(event.key) && !event.pressed) {
                    debug("Tapping: Tap release("); debug_dec(tapping_key.tap.count); debug(")\n");
                    keyp->tap = tapping_key.tap;
                    process_record(keyp);
                    tapping_key = *keyp;
                    debug_tapping_key();
                    return true;
                }
                else if (is_tap_key(event.key) && event.pressed) {
                    if (tapping_key.tap.count > 1) {
                        debug("Tapping: Start new tap with releasing last tap(>1).\n");
                        // unregister key
                        process_record(&(keyrecord_t){
                                .tap = tapping_key.tap,
                                .event.key = tapping_key.event.key,
                                .event.time = event.time,
                                .event.pressed = false
                        });
                    } else {
                        debug("Tapping: Start while last tap(1).\n");
                    }
                    tapping_key = *keyp;
                    waiting_buffer_scan_tap();
                    debug_tapping_key();
                    return true;
                }
                else {
                    if (!IS_NOEVENT(event)) {
                        debug("Tapping: key event while last tap(>0).\n");
                    }
                    process_record(keyp);
                    return true;
                }
            }
        }
        // after TAPPING_TERM
        else {
            if (tapping_key.tap.count == 0) {
                debug("Tapping: End. Timeout. Not tap(0): ");
                debug_event(event); debug("\n");
                process_record(&tapping_key);
                tapping_key = (keyrecord_t){};
                debug_tapping_key();
                return false;
            }  else {
                if (IS_TAPPING_KEY(event.key) && !event.pressed) {
                    debug("Tapping: End. last timeout tap release(>0).");
                    keyp->tap = tapping_key.tap;
                    process_record(keyp);
                    tapping_key = (keyrecord_t){};
                    return true;
                }
                else if (is_tap_key(event.key) && event.pressed) {
                    if (tapping_key.tap.count > 1) {
                        debug("Tapping: Start new tap with releasing last timeout tap(>1).\n");
                        // unregister key
                        process_record(&(keyrecord_t){
                                .tap = tapping_key.tap,
                                .event.key = tapping_key.event.key,
                                .event.time = event.time,
                                .event.pressed = false
                        });
                    } else {
                        debug("Tapping: Start while last timeout tap(1).\n");
                    }
                    tapping_key = *keyp;
                    waiting_buffer_scan_tap();
                    debug_tapping_key();
                    return true;
                }
                else {
                    if (!IS_NOEVENT(event)) {
                        debug("Tapping: key event while last timeout tap(>0).\n");
                    }
                    process_record(keyp);
                    return true;
                }
            }
        }
    } else if (IS_TAPPING_RELEASED()) {
        if (WITHIN_TAPPING_TERM(event)) {
            if (event.pressed) {
                if (IS_TAPPING_KEY(event.key)) {
#ifndef TAPPING_FORCE_HOLD
                    if (!tapping_key.tap.interrupted && tapping_key.tap.count > 0) {
                        // sequential tap.
                        keyp->tap = tapping_key.tap;
                        if (keyp->tap.count < 15) keyp->tap.count += 1;
                        debug("Tapping: Tap press("); debug_dec(keyp->tap.count); debug(")\n");
                        process_record(keyp);
                        tapping_key = *keyp;
                        debug_tapping_key();
                        return true;
                    }
#endif
                    // FIX: start new tap again
                    tapping_key = *keyp;
                    return true;
                } else if (is_tap_key(event.key)) {
                    // Sequential tap can be interfered with other tap key.
                    debug("Tapping: Start with interfering other tap.\n");
                    tapping_key = *keyp;
                    waiting_buffer_scan_tap();
                    debug_tapping_key();
                    return true;
                } else {
                    // should none in buffer
                    // FIX: interrupted when other key is pressed
                    tapping_key.tap.interrupted = true;
                    process_record(keyp);
                    return true;
                }
            } else {
                if (!IS_NOEVENT(event)) debug("Tapping: other key just after tap.\n");
                process_record(keyp);
                return true;
            }
        } else {
            // FIX: process_action here?
            // timeout. no sequential tap.
            debug("Tapping: End(Timeout after releasing last tap): ");
            debug_event(event); debug("\n");
            tapping_key = (keyrecord_t){};
            debug_tapping_key();
            return false;
        }
    }
    // not tapping state
    else {
        if (event.pressed && is_tap_key(event.key)) {
            debug("Tapping: Start(Press tap key).\n");
            tapping_key = *keyp;
            process_record_tap_hint(&tapping_key);
            waiting_buffer_scan_tap();
            debug_tapping_key();
            return true;
        } else {
            process_record(keyp);
            return true;
        }
    }
}


/** \brief Waiting buffer enq
 *
 * FIXME: Needs docs
 */
bool waiting_buffer_enq(keyrecord_t record)
{
    if (IS_NOEVENT(record.event)) {
        return true;
    }

    if ((waiting_buffer_head + 1) % WAITING_BUFFER_SIZE == waiting_buffer_tail) {
        debug("waiting_buffer_enq: Over flow.\n");
        return false;
    }

    waiting_buffer[waiting_buffer_head] = record;
    waiting_buffer_head = (waiting_buffer_head + 1) % WAITING_BUFFER_SIZE;

    debug("waiting_buffer_enq: "); debug_waiting_buffer();
    return true;
}

/** \brief Waiting buffer clear
 *
 * FIXME: Needs docs
 */
void waiting_buffer_clear(void)
{
    waiting_buffer_head = 0;
    waiting_buffer_tail = 0;
}

/** \brief Waiting buffer typed
 *
 * FIXME: Needs docs
 */
bool waiting_buffer_typed(keyevent_t event)
{
    for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
        if (KEYEQ(event.key, waiting_buffer[i].event.key) && event.pressed !=  waiting_buffer[i].event.pressed) {
            return true;
        }
    }
    return false;
}

/** \brief Waiting buffer has anykey pressed
 *
 * FIXME: Needs docs
 */
__attribute__((unused))
bool waiting_buffer_has_anykey_pressed(void)
{
    for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
        if (waiting_buffer[i].event.pressed) return true;
    }
    return false;
}

/** \brief Scan buffer for tapping
 *
 * FIXME: Needs docs
 */
void waiting_buffer_scan_tap(void)
{
    // tapping already is settled
    if (tapping_key.tap.count > 0) return;
    // invalid state: tapping_key released && tap.count == 0
    if (!tapping_key.event.pressed) return;

    for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
        if (IS_TAPPING_KEY(waiting_buffer[i].event.key) &&
                !waiting_buffer[i].event.pressed &&
                WITHIN_TAPPING_TERM(waiting_buffer[i].event)) {
            tapping_key.tap.count = 1;
            waiting_buffer[i].tap.count = 1;
            process_record(&tapping_key);

            debug("waiting_buffer_scan_tap: found at ["); debug_dec(i); debug("]\n");
            debug_waiting_buffer();
            return;
        }
    }
}


/** \brief Tapping key debug print
 *
 * FIXME: Needs docs
 */
static void debug_tapping_key(void)
{
    debug("TAPPING_KEY="); debug_record(tapping_key); debug("\n");
}

/** \brief Waiting buffer debug print
 *
 * FIXME: Needs docs
 */
static void debug_waiting_buffer(void)
{
    debug("{ ");
    for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
        debug("["); debug_dec(i); debug("]="); debug_record(waiting_buffer[i]); debug(" ");
    }
    debug("}\n");
}

#endif