134 lines
6.4 KiB
C
134 lines
6.4 KiB
C
/* Copyright 2017 Fredric Silberberg
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <inttypes.h>
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#include <stdint.h>
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#include "process_key_lock.h"
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#define BV_64(shift) (((uint64_t)1) << (shift))
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#define GET_KEY_ARRAY(code) (((code) < 0x40) ? key_state[0] : ((code) < 0x80) ? key_state[1] : ((code) < 0xC0) ? key_state[2] : key_state[3])
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#define GET_CODE_INDEX(code) (((code) < 0x40) ? (code) : ((code) < 0x80) ? (code)-0x40 : ((code) < 0xC0) ? (code)-0x80 : (code)-0xC0)
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#define KEY_STATE(code) (GET_KEY_ARRAY(code) & BV_64(GET_CODE_INDEX(code))) == BV_64(GET_CODE_INDEX(code))
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#define SET_KEY_ARRAY_STATE(code, val) \
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do { \
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switch (code) { \
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case 0x00 ... 0x3F: \
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key_state[0] = (val); \
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break; \
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case 0x40 ... 0x7F: \
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key_state[1] = (val); \
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break; \
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case 0x80 ... 0xBF: \
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key_state[2] = (val); \
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break; \
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case 0xC0 ... 0xFF: \
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key_state[3] = (val); \
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break; \
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} \
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} while (0)
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#define SET_KEY_STATE(code) SET_KEY_ARRAY_STATE(code, (GET_KEY_ARRAY(code) | BV_64(GET_CODE_INDEX(code))))
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#define UNSET_KEY_STATE(code) SET_KEY_ARRAY_STATE(code, (GET_KEY_ARRAY(code)) & ~(BV_64(GET_CODE_INDEX(code))))
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#define IS_STANDARD_KEYCODE(code) ((code) <= 0xFF)
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// Locked key state. This is an array of 256 bits, one for each of the standard keys supported qmk.
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uint64_t key_state[4] = {0x0, 0x0, 0x0, 0x0};
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bool watching = false;
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// Translate any OSM keycodes back to their unmasked versions.
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static inline uint16_t translate_keycode(uint16_t keycode) {
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if (keycode > QK_ONE_SHOT_MOD && keycode <= QK_ONE_SHOT_MOD_MAX) {
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return keycode ^ QK_ONE_SHOT_MOD;
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} else {
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return keycode;
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}
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}
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bool process_key_lock(uint16_t *keycode, keyrecord_t *record) {
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// We start by categorizing the keypress event. In the event of a down
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// event, there are several possibilities:
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// 1. The key is not being locked, and we are not watching for new keys.
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// In this case, we bail immediately. This is the common case for down events.
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// 2. The key was locked, and we need to unlock it. In this case, we will
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// reset the state in our map and return false. When the user releases the
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// key, the up event will no longer be masked and the OS will observe the
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// released key.
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// 3. KC_LOCK was just pressed. In this case, we set up the state machine
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// to watch for the next key down event, and finish processing
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// 4. The keycode is below 0xFF, and we are watching for new keys. In this case,
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// we will send the key down event to the os, and set the key_state for that
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// key to mask the up event.
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// 5. The keycode is above 0xFF, and we're wathing for new keys. In this case,
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// the user pressed a key that we cannot "lock", as it's a series of keys,
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// or a macro invocation, or a layer transition, or a custom-defined key, or
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// or some other arbitrary code. In this case, we bail immediately, reset
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// our watch state, and return true.
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//
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// In the event of an up event, there are these possibilities:
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// 1. The key is not being locked. In this case, we return true and bail
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// immediately. This is the common case.
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// 2. The key is being locked. In this case, we will mask the up event
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// by returning false, so the OS never sees that the key was released
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// until the user pressed the key again.
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// We translate any OSM keycodes back to their original keycodes, so that if the key being
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// one-shot modded is a standard keycode, we can handle it. This is the only set of special
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// keys that we handle
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uint16_t translated_keycode = translate_keycode(*keycode);
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if (record->event.pressed) {
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// Non-standard keycode, reset and return
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if (!(IS_STANDARD_KEYCODE(translated_keycode) || translated_keycode == KC_LOCK)) {
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watching = false;
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return true;
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}
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// If we're already watching, turn off the watch.
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if (translated_keycode == KC_LOCK) {
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watching = !watching;
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return false;
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}
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if (IS_STANDARD_KEYCODE(translated_keycode)) {
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// We check watching first. This is so that in the following scenario, we continue to
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// hold the key: KC_LOCK, KC_F, KC_LOCK, KC_F
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// If we checked in reverse order, we'd end up holding the key pressed after the second
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// KC_F press is registered, when the user likely meant to hold F
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if (watching) {
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watching = false;
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SET_KEY_STATE(translated_keycode);
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// We need to set the keycode passed in to be the translated keycode, in case we
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// translated a OSM back to the original keycode.
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*keycode = translated_keycode;
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// Let the standard keymap send the keycode down event. The up event will be masked.
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return true;
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}
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if (KEY_STATE(translated_keycode)) {
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UNSET_KEY_STATE(translated_keycode);
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// The key is already held, stop this process. The up event will be sent when the user
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// releases the key.
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return false;
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}
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}
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// Either the key isn't a standard key, or we need to send the down event. Continue standard
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// processing
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return true;
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} else {
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// Stop processing if it's a standard key and we're masking up.
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return !(IS_STANDARD_KEYCODE(translated_keycode) && KEY_STATE(translated_keycode));
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}
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}
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