common/action_tapping.c

   1 #include <stdint.h>
   2 #include <stdbool.h>
   3 #include "action.h"
   4 #include "action_layer.h"
   5 #include "action_tapping.h"
   6 #include "keycode.h"
   7 #include "timer.h"
   8
   9 #ifdef DEBUG_ACTION
  10 #include "debug.h"
  11 #else
  12 #include "nodebug.h"
  13 #endif
  14
  15 #ifndef NO_ACTION_TAPPING
  16
  17 #define IS_TAPPING()            !IS_NOEVENT(tapping_key.event)
  18 #define IS_TAPPING_PRESSED()    (IS_TAPPING() && tapping_key.event.pressed)
  19 #define IS_TAPPING_RELEASED()   (IS_TAPPING() && !tapping_key.event.pressed)
  20 #define IS_TAPPING_KEY(k)       (IS_TAPPING() && KEYEQ(tapping_key.event.key, (k)))
  21 #define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < TAPPING_TERM)
  22
  23
  24 static keyrecord_t tapping_key = {};
  25 static keyrecord_t waiting_buffer[WAITING_BUFFER_SIZE] = {};
  26 static uint8_t waiting_buffer_head = 0;
  27 static uint8_t waiting_buffer_tail = 0;
  28
  29 static bool process_tapping(keyrecord_t *record);
  30 static bool waiting_buffer_enq(keyrecord_t record);
  31 static void waiting_buffer_clear(void);
  32 static bool waiting_buffer_typed(keyevent_t event);
  33 static bool waiting_buffer_has_anykey_pressed(void);
  34 static void waiting_buffer_scan_tap(void);
  35 static void debug_tapping_key(void);
  36 static void debug_waiting_buffer(void);
  37
  38
  39 void action_tapping_process(keyrecord_t record)
  40 {
  41     if (process_tapping(&record)) {
  42         if (!IS_NOEVENT(record.event)) {
  43             debug("processed: "); debug_record(record); debug("\n");
  44         }
  45     } else {
  46         if (!waiting_buffer_enq(record)) {
  47             // clear all in case of overflow.
  48             debug("OVERFLOW: CLEAR ALL STATES\n");
  49             clear_keyboard();
  50             waiting_buffer_clear();
  51             tapping_key = (keyrecord_t){};
  52         }
  53     }
  54
  55     // process waiting_buffer
  56     if (!IS_NOEVENT(record.event) && waiting_buffer_head != waiting_buffer_tail) {
  57         debug("---- action_exec: process waiting_buffer -----\n");
  58     }
  59     for (; waiting_buffer_tail != waiting_buffer_head; waiting_buffer_tail = (waiting_buffer_tail + 1) % WAITING_BUFFER_SIZE) {
  60         if (process_tapping(&waiting_buffer[waiting_buffer_tail])) {
  61             debug("processed: waiting_buffer["); debug_dec(waiting_buffer_tail); debug("] = ");
  62             debug_record(waiting_buffer[waiting_buffer_tail]); debug("\n\n");
  63         } else {
  64             break;
  65         }
  66     }
  67     if (!IS_NOEVENT(record.event)) {
  68         debug("\n");
  69     }
  70 }
  71
  72
  73 /* Tapping
  74  *
  75  * Rule: Tap key is typed(pressed and released) within TAPPING_TERM.
  76  *       (without interfering by typing other key)
  77  */
  78 /* return true when key event is processed or consumed. */
  79 bool process_tapping(keyrecord_t *keyp)
  80 {
  81     keyevent_t event = keyp->event;
  82
  83     // if tapping
  84     if (IS_TAPPING_PRESSED()) {
  85         if (WITHIN_TAPPING_TERM(event)) {
  86             if (tapping_key.tap.count == 0) {
  87                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
  88                     // first tap!
  89                     debug("Tapping: First tap(0->1).\n");
  90                     tapping_key.tap.count = 1;
  91                     debug_tapping_key();
  92                     process_action(&tapping_key);
  93
  94                     // copy tapping state
  95                     keyp->tap = tapping_key.tap;
  96                     // enqueue
  97                     return false;
  98                 }
  99 #if TAPPING_TERM >= 500
 100                 /* Process a key typed within TAPPING_TERM
 101                  * This can register the key before settlement of tapping,
 102                  * useful for long TAPPING_TERM but may prevent fast typing.
 103                  */
 104                 else if (IS_RELEASED(event) && waiting_buffer_typed(event)) {
 105                     debug("Tapping: End. No tap. Interfered by typing key\n");
 106                     process_action(&tapping_key);
 107                     tapping_key = (keyrecord_t){};
 108                     debug_tapping_key();
 109                     // enqueue
 110                     return false;
 111                 }
 112 #endif
 113                 /* Process release event of a key pressed before tapping starts
 114                  * Without this unexpected repeating will occur with having fast repeating setting
 115                  * https://github.com/tmk/tmk_keyboard/issues/60
 116                  */
 117                 else if (IS_RELEASED(event) && !waiting_buffer_typed(event)) {
 118                     // Modifier should be retained till end of this tapping.
 119                     action_t action = layer_switch_get_action(event.key);
 120                     switch (action.kind.id) {
 121                         case ACT_LMODS:
 122                         case ACT_RMODS:
 123                             if (action.key.mods && !action.key.code) return false;
 124                             if (IS_MOD(action.key.code)) return false;
 125                             break;
 126                         case ACT_LMODS_TAP:
 127                         case ACT_RMODS_TAP:
 128                             if (action.key.mods && keyp->tap.count == 0) return false;
 129                             if (IS_MOD(action.key.code)) return false;
 130                             break;
 131                     }
 132                     // Release of key should be process immediately.
 133                     debug("Tapping: release event of a key pressed before tapping\n");
 134                     process_action(keyp);
 135                     return true;
 136                 }
 137                 else {
 138                     // set interrupted flag when other key preesed during tapping
 139                     if (event.pressed) {
 140                         tapping_key.tap.interrupted = true;
 141                     }
 142                     // enqueue
 143                     return false;
 144                 }
 145             }
 146             // tap_count > 0
 147             else {
 148                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 149                     debug("Tapping: Tap release("); debug_dec(tapping_key.tap.count); debug(")\n");
 150                     keyp->tap = tapping_key.tap;
 151                     process_action(keyp);
 152                     tapping_key = *keyp;
 153                     debug_tapping_key();
 154                     return true;
 155                 }
 156                 else if (is_tap_key(event.key) && event.pressed) {
 157                     if (tapping_key.tap.count > 1) {
 158                         debug("Tapping: Start new tap with releasing last tap(>1).\n");
 159                         // unregister key
 160                         process_action(&(keyrecord_t){
 161                                 .tap = tapping_key.tap,
 162                                 .event.key = tapping_key.event.key,
 163                                 .event.time = event.time,
 164                                 .event.pressed = false
 165                         });
 166                     } else {
 167                         debug("Tapping: Start while last tap(1).\n");
 168                     }
 169                     tapping_key = *keyp;
 170                     waiting_buffer_scan_tap();
 171                     debug_tapping_key();
 172                     return true;
 173                 }
 174                 else {
 175                     if (!IS_NOEVENT(event)) {
 176                         debug("Tapping: key event while last tap(>0).\n");
 177                     }
 178                     process_action(keyp);
 179                     return true;
 180                 }
 181             }
 182         }
 183         // after TAPPING_TERM
 184         else {
 185             if (tapping_key.tap.count == 0) {
 186                 debug("Tapping: End. Timeout. Not tap(0): ");
 187                 debug_event(event); debug("\n");
 188                 process_action(&tapping_key);
 189                 tapping_key = (keyrecord_t){};
 190                 debug_tapping_key();
 191                 return false;
 192             }  else {
 193                 if (IS_TAPPING_KEY(event.key) && !event.pressed) {
 194                     debug("Tapping: End. last timeout tap release(>0).");
 195                     keyp->tap = tapping_key.tap;
 196                     process_action(keyp);
 197                     tapping_key = (keyrecord_t){};
 198                     return true;
 199                 }
 200                 else if (is_tap_key(event.key) && event.pressed) {
 201                     if (tapping_key.tap.count > 1) {
 202                         debug("Tapping: Start new tap with releasing last timeout tap(>1).\n");
 203                         // unregister key
 204                         process_action(&(keyrecord_t){
 205                                 .tap = tapping_key.tap,
 206                                 .event.key = tapping_key.event.key,
 207                                 .event.time = event.time,
 208                                 .event.pressed = false
 209                         });
 210                     } else {
 211                         debug("Tapping: Start while last timeout tap(1).\n");
 212                     }
 213                     tapping_key = *keyp;
 214                     waiting_buffer_scan_tap();
 215                     debug_tapping_key();
 216                     return true;
 217                 }
 218                 else {
 219                     if (!IS_NOEVENT(event)) {
 220                         debug("Tapping: key event while last timeout tap(>0).\n");
 221                     }
 222                     process_action(keyp);
 223                     return true;
 224                 }
 225             }
 226         }
 227     } else if (IS_TAPPING_RELEASED()) {
 228         if (WITHIN_TAPPING_TERM(event)) {
 229             if (event.pressed) {
 230                 if (IS_TAPPING_KEY(event.key)) {
 231                     if (!tapping_key.tap.interrupted && tapping_key.tap.count > 0) {
 232                         // sequential tap.
 233                         keyp->tap = tapping_key.tap;
 234                         if (keyp->tap.count < 15) keyp->tap.count += 1;
 235                         debug("Tapping: Tap press("); debug_dec(keyp->tap.count); debug(")\n");
 236                         process_action(keyp);
 237                         tapping_key = *keyp;
 238                         debug_tapping_key();
 239                         return true;
 240                     } else {
 241                         // FIX: start new tap again
 242                         tapping_key = *keyp;
 243                         return true;
 244                     }
 245                 } else if (is_tap_key(event.key)) {
 246                     // Sequential tap can be interfered with other tap key.
 247                     debug("Tapping: Start with interfering other tap.\n");
 248                     tapping_key = *keyp;
 249                     waiting_buffer_scan_tap();
 250                     debug_tapping_key();
 251                     return true;
 252                 } else {
 253                     // should none in buffer
 254                     // FIX: interrupted when other key is pressed
 255                     tapping_key.tap.interrupted = true;
 256                     process_action(keyp);
 257                     return true;
 258                 }
 259             } else {
 260                 if (!IS_NOEVENT(event)) debug("Tapping: other key just after tap.\n");
 261                 process_action(keyp);
 262                 return true;
 263             }
 264         } else {
 265             // FIX: process_aciton here?
 266             // timeout. no sequential tap.
 267             debug("Tapping: End(Timeout after releasing last tap): ");
 268             debug_event(event); debug("\n");
 269             tapping_key = (keyrecord_t){};
 270             debug_tapping_key();
 271             return false;
 272         }
 273     }
 274     // not tapping state
 275     else {
 276         if (event.pressed && is_tap_key(event.key)) {
 277             debug("Tapping: Start(Press tap key).\n");
 278             tapping_key = *keyp;
 279             waiting_buffer_scan_tap();
 280             debug_tapping_key();
 281             return true;
 282         } else {
 283             process_action(keyp);
 284             return true;
 285         }
 286     }
 287 }
 288
 289
 290 /*
 291  * Waiting buffer
 292  */
 293 bool waiting_buffer_enq(keyrecord_t record)
 294 {
 295     if (IS_NOEVENT(record.event)) {
 296         return true;
 297     }
 298
 299     if ((waiting_buffer_head + 1) % WAITING_BUFFER_SIZE == waiting_buffer_tail) {
 300         debug("waiting_buffer_enq: Over flow.\n");
 301         return false;
 302     }
 303
 304     waiting_buffer[waiting_buffer_head] = record;
 305     waiting_buffer_head = (waiting_buffer_head + 1) % WAITING_BUFFER_SIZE;
 306
 307     debug("waiting_buffer_enq: "); debug_waiting_buffer();
 308     return true;
 309 }
 310
 311 void waiting_buffer_clear(void)
 312 {
 313     waiting_buffer_head = 0;
 314     waiting_buffer_tail = 0;
 315 }
 316
 317 bool waiting_buffer_typed(keyevent_t event)
 318 {
 319     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 320         if (KEYEQ(event.key, waiting_buffer[i].event.key) && event.pressed !=  waiting_buffer[i].event.pressed) {
 321             return true;
 322         }
 323     }
 324     return false;
 325 }
 326
 327 bool waiting_buffer_has_anykey_pressed(void)
 328 {
 329     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 330         if (waiting_buffer[i].event.pressed) return true;
 331     }
 332     return false;
 333 }
 334
 335 /* scan buffer for tapping */
 336 void waiting_buffer_scan_tap(void)
 337 {
 338     // tapping already is settled
 339     if (tapping_key.tap.count > 0) return;
 340     // invalid state: tapping_key released && tap.count == 0
 341     if (!tapping_key.event.pressed) return;
 342
 343     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 344         if (IS_TAPPING_KEY(waiting_buffer[i].event.key) &&
 345                 !waiting_buffer[i].event.pressed &&
 346                 WITHIN_TAPPING_TERM(waiting_buffer[i].event)) {
 347             tapping_key.tap.count = 1;
 348             waiting_buffer[i].tap.count = 1;
 349             process_action(&tapping_key);
 350
 351             debug("waiting_buffer_scan_tap: found at ["); debug_dec(i); debug("]\n");
 352             debug_waiting_buffer();
 353             return;
 354         }
 355     }
 356 }
 357
 358
 359 /*
 360  * debug print
 361  */
 362 static void debug_tapping_key(void)
 363 {
 364     debug("TAPPING_KEY="); debug_record(tapping_key); debug("\n");
 365 }
 366
 367 static void debug_waiting_buffer(void)
 368 {
 369     debug("{ ");
 370     for (uint8_t i = waiting_buffer_tail; i != waiting_buffer_head; i = (i + 1) % WAITING_BUFFER_SIZE) {
 371         debug("["); debug_dec(i); debug("]="); debug_record(waiting_buffer[i]); debug(" ");
 372     }
 373     debug("}\n");
 374 }
 375
 376 #endif