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99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
// Copyright 2022-2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @file layer_lock.h
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* @brief Layer Lock, a key to stay in the current layer.
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*
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* Overview
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* --------
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*
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* Layers are often accessed by holding a button, e.g. with a momentary layer
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* switch `MO(layer)` or layer tap `LT(layer, key)` key. But you may sometimes
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* want to "lock" or "toggle" the layer so that it stays on without having to
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* hold down a button. One way to do that is with a tap-toggle `TT` layer key,
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* but here is an alternative.
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*
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* This library implements a "Layer Lock key". When tapped, it "locks" the
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* highest layer to stay active, assuming the layer was activated by one of the
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* following keys:
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*
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* * `MO(layer)` momentary layer switch
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* * `LT(layer, key)` layer tap
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* * `OSL(layer)` one-shot layer
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* * `TT(layer)` layer tap toggle
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* * `LM(layer, mod)` layer-mod key (the layer is locked, but not the mods)
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*
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* Tapping the Layer Lock key again unlocks and turns off the layer.
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*
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* @note When a layer is "locked", other layer keys such as `TO(layer)` or
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* manually calling `layer_off(layer)` will override and unlock the layer.
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*
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* Configuration
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* -------------
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*
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* Optionally, a timeout may be defined so that Layer Lock disables
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* automatically if not keys are pressed for `LAYER_LOCK_IDLE_TIMEOUT`
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* milliseconds. Define `LAYER_LOCK_IDLE_TIMEOUT` in your config.h, for instance
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*
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* #define LAYER_LOCK_IDLE_TIMEOUT 60000 // Turn off after 60 seconds.
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*
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* For full documentation, see
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* <https://getreuer.info/posts/keyboards/layer-lock>
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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "action_layer.h"
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#include "action_util.h"
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/** Returns true if `layer` is currently locked. */
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bool is_layer_locked(uint8_t layer);
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/** Locks and turns on `layer`. */
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void layer_lock_on(uint8_t layer);
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/** Unlocks and turns off `layer`. */
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void layer_lock_off(uint8_t layer);
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/** Unlocks and turns off all locked layers. */
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void layer_lock_all_off(void);
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/** Toggles whether `layer` is locked. */
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void layer_lock_invert(uint8_t layer);
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/**
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* Optional callback that gets called when a layer is locked or unlocked.
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*
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* This is useful to represent the current lock state, e.g. by setting an LED or
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* playing a sound. In your keymap, define
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*
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* void layer_lock_set_user(layer_state_t locked_layers) {
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* // Do something like `set_led(is_layer_locked(NAV));`
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* }
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*
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* @param locked_layers Bitfield in which the kth bit represents whether the
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* kth layer is on.
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*/
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bool layer_lock_set_kb(layer_state_t locked_layers);
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bool layer_lock_set_user(layer_state_t locked_layers);
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/** Handle various background tasks */
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void layer_lock_task(void);
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/** Update any configured timeouts */
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void layer_lock_activity_trigger(void);
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