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// Copyright 2021-2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @file custom_shift_keys.c
* @brief Custom Shift Keys implementation
*
* For full documentation, see
* <https://getreuer.info/posts/keyboards/custom-shift-keys>
*/
#include "custom_shift_keys.h"
#if !defined(IS_QK_MOD_TAP)
// Attempt to detect out-of-date QMK installation, which would fail with
// implicit-function-declaration errors in the code below.
#error "custom_shift_keys: QMK version is too old to build. Please update QMK."
#else
bool process_custom_shift_keys(uint16_t keycode, keyrecord_t *record) {
static uint16_t registered_keycode = KC_NO;
// If a custom shift key is registered, then this event is either releasing
// it or manipulating another key at the same time. Either way, we release
// the currently registered key.
if (registered_keycode != KC_NO) {
unregister_code16(registered_keycode);
registered_keycode = KC_NO;
}
if (record->event.pressed) { // Press event.
const uint8_t saved_mods = get_mods();
#ifndef NO_ACTION_ONESHOT
const uint8_t mods = saved_mods | get_weak_mods() | get_oneshot_mods();
#else
const uint8_t mods = saved_mods | get_weak_mods();
#endif // NO_ACTION_ONESHOT
if ((mods & MOD_MASK_SHIFT) != 0 // Shift is held.
#if CUSTOM_SHIFT_KEYS_NEGMODS != 0
// Nothing in CUSTOM_SHIFT_KEYS_NEGMODS is held.
&& (mods & (CUSTOM_SHIFT_KEYS_NEGMODS)) == 0
#endif // CUSTOM_SHIFT_KEYS_NEGMODS != 0
) {
// Continue default handling if this is a tap-hold key being held.
if ((IS_QK_MOD_TAP(keycode) || IS_QK_LAYER_TAP(keycode)) &&
record->tap.count == 0) {
return true;
}
// Search for a custom shift key whose keycode is `keycode`.
for (int i = 0; i < NUM_CUSTOM_SHIFT_KEYS; ++i) {
if (keycode == custom_shift_keys[i].keycode) {
registered_keycode = custom_shift_keys[i].shifted_keycode;
if (IS_QK_MODS(registered_keycode) && // Should keycode be shifted?
(QK_MODS_GET_MODS(registered_keycode) & MOD_LSFT) != 0) {
register_code16(registered_keycode); // If so, press it directly.
} else {
// Otherwise cancel shift mods, press the key, and restore mods.
del_weak_mods(MOD_MASK_SHIFT);
#ifndef NO_ACTION_ONESHOT
del_oneshot_mods(MOD_MASK_SHIFT);
#endif // NO_ACTION_ONESHOT
unregister_mods(MOD_MASK_SHIFT);
register_code16(registered_keycode);
set_mods(saved_mods);
}
return false;
}
}
}
}
return true; // Continue with default handling.
}
#endif // version check
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