qmk_keymaps/keyboards/crkbd/keymaps/sajenim/features/layer_lock.h

138 lines
4.3 KiB
C

// Copyright 2022-2023 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 layer_lock.h
* @brief Layer Lock, a key to stay in the current layer.
*
* Overview
* --------
*
* Layers are often accessed by holding a button, e.g. with a momentary layer
* switch `MO(layer)` or layer tap `LT(layer, key)` key. But you may sometimes
* want to "lock" or "toggle" the layer so that it stays on without having to
* hold down a button. One way to do that is with a tap-toggle `TT` layer key,
* but here is an alternative.
*
* This library implements a "Layer Lock key". When tapped, it "locks" the
* highest layer to stay active, assuming the layer was activated by one of the
* following keys:
*
* * `MO(layer)` momentary layer switch
* * `LT(layer, key)` layer tap
* * `OSL(layer)` one-shot layer
* * `TT(layer)` layer tap toggle
* * `LM(layer, mod)` layer-mod key (the layer is locked, but not the mods)
*
* Tapping the Layer Lock key again unlocks and turns off the layer.
*
* @note When a layer is "locked", other layer keys such as `TO(layer)` or
* manually calling `layer_off(layer)` will override and unlock the layer.
*
* Configuration
* -------------
*
* Optionally, a timeout may be defined so that Layer Lock disables
* automatically if not keys are pressed for `LAYER_LOCK_IDLE_TIMEOUT`
* milliseconds. Define `LAYER_LOCK_IDLE_TIMEOUT` in your config.h, for instance
*
* #define LAYER_LOCK_IDLE_TIMEOUT 60000 // Turn off after 60 seconds.
*
* and call `layer_lock_task()` from your `matrix_scan_user()` in keymap.c:
*
* void matrix_scan_user(void) {
* layer_lock_task();
* // Other tasks...
* }
*
* For full documentation, see
* <https://getreuer.info/posts/keyboards/layer-lock>
*/
#pragma once
#include "quantum.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Handler function for Layer Lock.
*
* In your keymap, define a custom keycode to use for Layer Lock. Then handle
* Layer Lock from your `process_record_user` function by calling
* `process_layer_lock`, passing your custom keycode for the `lock_keycode` arg:
*
* #include "features/layer_lock.h"
*
* bool process_record_user(uint16_t keycode, keyrecord_t* record) {
* if (!process_layer_lock(keycode, record, LLOCK)) { return false; }
* // Your macros ...
*
* return true;
* }
*/
bool process_layer_lock(uint16_t keycode, keyrecord_t* record,
uint16_t lock_keycode);
/** Returns true if `layer` is currently locked. */
bool is_layer_locked(uint8_t layer);
/** Locks and turns on `layer`. */
void layer_lock_on(uint8_t layer);
/** Unlocks and turns off `layer`. */
void layer_lock_off(uint8_t layer);
/** Unlocks and turns off all locked layers. */
void layer_lock_all_off(void);
/** Toggles whether `layer` is locked. */
void layer_lock_invert(uint8_t layer);
/**
* Optional callback that gets called when a layer is locked or unlocked.
*
* This is useful to represent the current lock state, e.g. by setting an LED or
* playing a sound. In your keymap, define
*
* void layer_lock_set_user(layer_state_t locked_layers) {
* // Do something like `set_led(is_layer_locked(NAV));`
* }
*
* @param locked_layers Bitfield in which the kth bit represents whether the
* kth layer is on.
*/
void layer_lock_set_user(layer_state_t locked_layers);
/**
* @fn layer_lock_task(void)
* Matrix task function for Layer Lock.
*
* If using `LAYER_LOCK_IDLE_TIMEOUT`, call this function from your
* `matrix_scan_user()` function in keymap.c. (If no timeout is set, calling
* `layer_lock_task()` has no effect.)
*/
#if LAYER_LOCK_IDLE_TIMEOUT > 0
void layer_lock_task(void);
#else
static inline void layer_lock_task(void) {}
#endif // LAYER_LOCK_IDLE_TIMEOUT > 0
#ifdef __cplusplus
}
#endif