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[Core] Add Layer Lock feature (#23430)

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Co-authored-by: Daniel <1767914+iamdanielv@users.noreply.github.com>
Co-authored-by: Pascal Getreuer <getreuer@google.com>
Co-authored-by: Pascal Getreuer <50221757+getreuer@users.noreply.github.com>
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Drashna Jaelre 2024-11-20 22:31:54 -08:00 committed by GitHub
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20 changed files with 871 additions and 2 deletions
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1
builddefs/generic_features.mk
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@ -36,6 +36,7 @@ GENERIC_FEATURES = \
HAPTIC \
KEY_LOCK \
KEY_OVERRIDE \
LAYER_LOCK \
LEADER \
MAGIC \
MOUSEKEY \

7
data/constants/keycodes/keycodes_0.0.6_quantum.hjson
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@ -3,5 +3,12 @@
"0x7C20": "!delete!", // old QK_OUTPUT_AUTO
"0x7C21": "!delete!", // old QK_OUTPUT_USB
"0x7C22": "!delete!", // old QK_OUTPUT_BLUETOOTH
"0x7C7B": {
"group": "quantum",
"key": "QK_LAYER_LOCK",
"aliases": [
"QK_LLCK"
]
}
}
}

3
data/mappings/info_config.hjson
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@ -64,6 +64,9 @@
"WEAR_LEVELING_BACKING_SIZE": {"info_key": "eeprom.wear_leveling.backing_size", "value_type": "int", "to_json": false},
"WEAR_LEVELING_LOGICAL_SIZE": {"info_key": "eeprom.wear_leveling.logical_size", "value_type": "int", "to_json": false},
// Layer locking
"LAYER_LOCK_IDLE_TIMEOUT": {"info_key": "layer_lock.timeout", "value_type": "int"},
// Indicators
"LED_CAPS_LOCK_PIN": {"info_key": "indicators.caps_lock"},
"LED_NUM_LOCK_PIN": {"info_key": "indicators.num_lock"},

6
data/schemas/keyboard.jsonschema
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@ -375,6 +375,12 @@
}
},
"keycodes": {"$ref": "qmk.definitions.v1#/keycode_decl_array"},
"layer_lock": {
"type": "object",
"properties": {
"timeout": {"$ref": "qmk.definitions.v1#/unsigned_int"}
}
},
"layout_aliases": {
"type": "object",
"additionalProperties": {"$ref": "qmk.definitions.v1#/layout_macro"}

1
docs/_sidebar.json
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@ -123,6 +123,7 @@
{ "text": "Key Lock", "link": "/features/key_lock" },
{ "text": "Key Overrides", "link": "/features/key_overrides" },
{ "text": "Layers", "link": "/feature_layers" },
{ "text": "Layer Lock", "link": "/features/layer_lock" },
{ "text": "One Shot Keys", "link": "/one_shot_keys" },
{ "text": "OS Detection", "link": "/features/os_detection" },
{ "text": "Raw HID", "link": "/features/rawhid" },

3
docs/feature_layers.md
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@ -17,6 +17,9 @@ These functions allow you to activate layers in various ways. Note that layers a
* `TO(layer)` - activates *layer* and de-activates all other layers (except your default layer). This function is special, because instead of just adding/removing one layer to your active layer stack, it will completely replace your current active layers, uniquely allowing you to replace higher layers with a lower one. This is activated on keydown (as soon as the key is pressed).
* `TT(layer)` - Layer Tap-Toggle. If you hold the key down, *layer* is activated, and then is de-activated when you let go (like `MO`). If you repeatedly tap it, the layer will be toggled on or off (like `TG`). It needs 5 taps by default, but you can change this by defining `TAPPING_TOGGLE` -- for example, `#define TAPPING_TOGGLE 2` to toggle on just two taps.
See also the [Layer Lock key](features/layer_lock), which locks the highest
active layer until pressed again.
### Caveats {#caveats}
Currently, the `layer` argument of `LT()` is limited to layers 0-15, and the `kc` argument to the [Basic Keycode set](keycodes_basic), meaning you can't use keycodes like `LCTL()`, `KC_TILD`, or anything greater than `0xFF`. This is because QMK uses 16-bit keycodes, of which 4 bits are used for the function identifier and 4 bits for the layer, leaving only 8 bits for the keycode.

139
docs/features/layer_lock.md Normal file
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@ -0,0 +1,139 @@
# Layer Lock
Some [layer switches](../feature_layers#switching-and-toggling-layers) access
the layer by holding the key, including momentary layer `MO(layer)` and layer
tap `LT(layer, key)` keys. You may sometimes need to stay on the layer for a
long period of time. Layer Lock "locks" the current layer to stay on, supposing
it was accessed by one of:
* `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)
Press the Layer Lock key again to unlock the layer. Additionally, when a layer
is locked, layer switch keys that turn off the layer such as `TO(other_layer)`
will unlock it.
## How do I enable Layer Lock
In your rules.mk, add:
```make
LAYER_LOCK_ENABLE = yes
```
Pick a key in your keymap on a layer you intend to lock, and assign it the
keycode `QK_LAYER_LOCK` (short alias `QK_LLCK`). Note that locking the base
layer has no effect, so typically, this key is used on layers above the base
layer.
## Example use
Consider a keymap with the following base layer.
![Base layer with a MO(NAV) key.](https://i.imgur.com/DkEhj9x.png)
The highlighted key is a momentary layer switch `MO(NAV)`. Holding it accesses a
navigation layer.
![Nav layer with a Layer Lock key.](https://i.imgur.com/2wUZNWk.png)
Holding the NAV key is fine for brief use, but awkward to continue holding when
using navigation functions continuously. The Layer Lock key comes to the rescue:
1. Hold the NAV key, activating the navigation layer.
2. Tap Layer Lock.
3. Release NAV. The navigation layer stays on.
4. Make use of the arrow keys, etc.
5. Tap Layer Lock or NAV again to turn the navigation layer back off.
A variation that would also work is to put the Layer Lock key on the base layer
and make other layers transparent (`KC_TRNS`) in that position. Pressing the
Layer Lock key locks (or unlocks) the highest active layer, regardless of which
layer the Layer Lock key is on.
## Idle timeout
Optionally, Layer Lock may be configured to unlock if the keyboard is idle
for some time. In config.h, define `LAYER_LOCK_IDLE_TIMEOUT` in units of
milliseconds:
```c
#define LAYER_LOCK_IDLE_TIMEOUT 60000 // Turn off after 60 seconds.
```
## Functions
Use the following functions to query and manipulate the layer lock state.
| Function | Description |
|----------------------------|------------------------------------|
| `is_layer_locked(layer)` | Checks whether `layer` is locked. |
| `layer_lock_on(layer)` | Locks and turns on `layer`. |
| `layer_lock_off(layer)` | Unlocks and turns off `layer`. |
| `layer_lock_invert(layer)` | Toggles whether `layer` is locked. |
## Representing the current Layer Lock state
There is an optional callback `layer_lock_set_user()` that gets called when a
layer is locked or unlocked. This is useful to represent the current lock state
for instance by setting an LED. In keymap.c, define
```c
bool layer_lock_set_user(layer_state_t locked_layers) {
// Do something like `set_led(is_layer_locked(NAV));`
return true;
}
```
The argument `locked_layers` is a bitfield in which the kth bit is on if the kth
layer is locked. Alternatively, you can use `is_layer_locked(layer)` to check if
a given layer is locked.
## Combine Layer Lock with a mod-tap
It is possible to create a [mod-tap MT key](../mod_tap) that acts as a modifier
on hold and Layer Lock on tap. Since Layer Lock is not a [basic
keycode](../keycodes_basic), attempting `MT(mod, QK_LLCK)` is invalid does not
work directly, yet this effect can be achieved through [changing the tap
function](../mod_tap#changing-tap-function). For example, the following
implements a `SFTLLCK` key that acts as Shift on hold and Layer Lock on tap:
```c
#define SFTLLCK LSFT_T(KC_0)
// Use SFTLLCK in your keymap...
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
switch (keycode) {
case SFTLLCK:
if (record->tap.count) {
if (record->event.pressed) {
// Toggle the lock on the highest layer.
layer_lock_invert(get_highest_layer(layer_state));
}
return false;
}
break;
// Other macros...
}
return true;
}
```
In the above, `KC_0` is an arbitrary placeholder for the tapping keycode. This
keycode will never be sent, so any basic keycode will do. In
`process_record_user()`, the tap press event is changed to toggle the lock on
the highest layer. Layer Lock can be combined with a [layer-tap LT
key](../feature_layers#switching-and-toggling-layers) similarly.

8
docs/keycodes.md
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@ -387,6 +387,14 @@ See also: [Key Lock](features/key_lock)
|---------|--------------------------------------------------------------|
|`QK_LOCK`|Hold down the next key pressed, until the key is pressed again|
## Layer Lock {#layer-lock}
See also: [Layer Lock](features/layer_lock)
|Key |Aliases |Description |
|---------------|---------|----------------------------------|
|`QK_LAYER_LOCK`|`QK_LLCK`|Locks or unlocks the highest layer|
## Layer Switching {#layer-switching}
See also: [Layer Switching](feature_layers#switching-and-toggling-layers)

7
quantum/keyboard.c
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@ -140,6 +140,9 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#ifdef OS_DETECTION_ENABLE
# include "os_detection.h"
#endif
#if defined(LAYER_LOCK_ENABLE) && LAYER_LOCK_IDLE_TIMEOUT > 0
# include "layer_lock.h"
#endif // LAYER_LOCK_ENABLE
static uint32_t last_input_modification_time = 0;
uint32_t last_input_activity_time(void) {
@ -655,6 +658,10 @@ void quantum_task(void) {
#ifdef SECURE_ENABLE
secure_task();
#endif
#if defined(LAYER_LOCK_ENABLE) && LAYER_LOCK_IDLE_TIMEOUT > 0
layer_lock_task();
#endif
}
/** \brief Main task that is repeatedly called as fast as possible. */

6
quantum/keycodes.h
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@ -759,6 +759,7 @@ enum qk_keycode_defines {
QK_TRI_LAYER_UPPER = 0x7C78,
QK_REPEAT_KEY = 0x7C79,
QK_ALT_REPEAT_KEY = 0x7C7A,
QK_LAYER_LOCK = 0x7C7B,
QK_KB_0 = 0x7E00,
QK_KB_1 = 0x7E01,
QK_KB_2 = 0x7E02,
@ -1445,6 +1446,7 @@ enum qk_keycode_defines {
TL_UPPR = QK_TRI_LAYER_UPPER,
QK_REP = QK_REPEAT_KEY,
QK_AREP = QK_ALT_REPEAT_KEY,
QK_LLCK = QK_LAYER_LOCK,
};
// Range Helpers
@ -1501,7 +1503,7 @@ enum qk_keycode_defines {
#define IS_UNDERGLOW_KEYCODE(code) ((code) >= QK_UNDERGLOW_TOGGLE && (code) <= QK_UNDERGLOW_SPEED_DOWN)
#define IS_RGB_KEYCODE(code) ((code) >= RGB_MODE_PLAIN && (code) <= RGB_MODE_TWINKLE)
#define IS_RGB_MATRIX_KEYCODE(code) ((code) >= QK_RGB_MATRIX_ON && (code) <= QK_RGB_MATRIX_SPEED_DOWN)
#define IS_QUANTUM_KEYCODE(code) ((code) >= QK_BOOTLOADER && (code) <= QK_ALT_REPEAT_KEY)
#define IS_QUANTUM_KEYCODE(code) ((code) >= QK_BOOTLOADER && (code) <= QK_LAYER_LOCK)
#define IS_KB_KEYCODE(code) ((code) >= QK_KB_0 && (code) <= QK_KB_31)
#define IS_USER_KEYCODE(code) ((code) >= QK_USER_0 && (code) <= QK_USER_31)
@ -1527,6 +1529,6 @@ enum qk_keycode_defines {
#define UNDERGLOW_KEYCODE_RANGE QK_UNDERGLOW_TOGGLE ... QK_UNDERGLOW_SPEED_DOWN
#define RGB_KEYCODE_RANGE RGB_MODE_PLAIN ... RGB_MODE_TWINKLE
#define RGB_MATRIX_KEYCODE_RANGE QK_RGB_MATRIX_ON ... QK_RGB_MATRIX_SPEED_DOWN
#define QUANTUM_KEYCODE_RANGE QK_BOOTLOADER ... QK_ALT_REPEAT_KEY
#define QUANTUM_KEYCODE_RANGE QK_BOOTLOADER ... QK_LAYER_LOCK
#define KB_KEYCODE_RANGE QK_KB_0 ... QK_KB_31
#define USER_KEYCODE_RANGE QK_USER_0 ... QK_USER_31

81
quantum/layer_lock.c Normal file
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@ -0,0 +1,81 @@
// 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.
#include "layer_lock.h"
#include "quantum_keycodes.h"
#ifndef NO_ACTION_LAYER
// The current lock state. The kth bit is on if layer k is locked.
layer_state_t locked_layers = 0;
// Layer Lock timer to disable layer lock after X seconds inactivity
# if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
uint32_t layer_lock_timer = 0;
void layer_lock_task(void) {
if (locked_layers && timer_elapsed32(layer_lock_timer) > LAYER_LOCK_IDLE_TIMEOUT) {
layer_lock_all_off();
layer_lock_timer = timer_read32();
}
}
# endif // LAYER_LOCK_IDLE_TIMEOUT > 0
bool is_layer_locked(uint8_t layer) {
return locked_layers & ((layer_state_t)1 << layer);
}
void layer_lock_invert(uint8_t layer) {
const layer_state_t mask = (layer_state_t)1 << layer;
if ((locked_layers & mask) == 0) { // Layer is being locked.
# ifndef NO_ACTION_ONESHOT
if (layer == get_oneshot_layer()) {
reset_oneshot_layer(); // Reset so that OSL doesn't turn layer off.
}
# endif // NO_ACTION_ONESHOT
layer_on(layer);
# if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
layer_lock_timer = timer_read32();
# endif // LAYER_LOCK_IDLE_TIMEOUT > 0
} else { // Layer is being unlocked.
layer_off(layer);
}
layer_lock_set_kb(locked_layers ^= mask);
}
// Implement layer_lock_on/off by deferring to layer_lock_invert.
void layer_lock_on(uint8_t layer) {
if (!is_layer_locked(layer)) {
layer_lock_invert(layer);
}
}
void layer_lock_off(uint8_t layer) {
if (is_layer_locked(layer)) {
layer_lock_invert(layer);
}
}
void layer_lock_all_off(void) {
layer_and(~locked_layers);
locked_layers = 0;
layer_lock_set_kb(locked_layers);
}
__attribute__((weak)) bool layer_lock_set_kb(layer_state_t locked_layers) {
return layer_lock_set_user(locked_layers);
}
__attribute__((weak)) bool layer_lock_set_user(layer_state_t locked_layers) {
return true;
}
#endif // NO_ACTION_LAYER

135
quantum/layer_lock.h Normal file
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@ -0,0 +1,135 @@
// 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 <stdint.h>
#include <stdbool.h>
#include "action_layer.h"
#include "action_util.h"
/**
* 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;
* }
*/
#ifndef NO_ACTION_LAYER
/** 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.
*/
bool layer_lock_set_kb(layer_state_t locked_layers);
bool layer_lock_set_user(layer_state_t locked_layers);
void layer_lock_task(void);
#else // NO_ACTION_LAYER
static inline bool is_layer_locked(uint8_t layer) {
return false;
}
static inline void layer_lock_on(uint8_t layer) {}
static inline void layer_lock_off(uint8_t layer) {}
static inline void layer_lock_all_off(void) {}
static inline void layer_lock_invert(uint8_t layer) {}
static inline bool layer_lock_set_kb(layer_state_t locked_layers) {
return true;
}
static inline bool layer_lock_set_user(layer_state_t locked_layers) {
return true;
}
static inline void layer_lock_task(void) {}
#endif // NO_ACTION_LAYER

95
quantum/process_keycode/process_layer_lock.c Normal file
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@ -0,0 +1,95 @@
// 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.c
* @brief Layer Lock implementation
*
* For full documentation, see
* <https://getreuer.info/posts/keyboards/layer-lock>
*/
#include "layer_lock.h"
#include "process_layer_lock.h"
#include "quantum_keycodes.h"
#include "action_util.h"
// The current lock state. The kth bit is on if layer k is locked.
extern layer_state_t locked_layers;
#if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
extern uint32_t layer_lock_timer;
#endif
// Handles an event on an `MO` or `TT` layer switch key.
static bool handle_mo_or_tt(uint8_t layer, keyrecord_t* record) {
if (is_layer_locked(layer)) {
if (record->event.pressed) { // On press, unlock the layer.
layer_lock_invert(layer);
}
return false; // Skip default handling.
}
return true;
}
bool process_layer_lock(uint16_t keycode, keyrecord_t* record) {
#ifndef NO_ACTION_LAYER
# if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
layer_lock_timer = timer_read32();
# endif // LAYER_LOCK_IDLE_TIMEOUT > 0
// The intention is that locked layers remain on. If something outside of
// this feature turned any locked layers off, unlock them.
if ((locked_layers & ~layer_state) != 0) {
layer_lock_set_kb(locked_layers &= layer_state);
}
if (keycode == QK_LAYER_LOCK) {
if (record->event.pressed) { // The layer lock key was pressed.
layer_lock_invert(get_highest_layer(layer_state));
}
return false;
}
switch (keycode) {
case QK_MOMENTARY ... QK_MOMENTARY_MAX: // `MO(layer)` keys.
return handle_mo_or_tt(QK_MOMENTARY_GET_LAYER(keycode), record);
case QK_LAYER_TAP_TOGGLE ... QK_LAYER_TAP_TOGGLE_MAX: // `TT(layer)`.
return handle_mo_or_tt(QK_LAYER_TAP_TOGGLE_GET_LAYER(keycode), record);
case QK_LAYER_MOD ... QK_LAYER_MOD_MAX: { // `LM(layer, mod)`.
uint8_t layer = QK_LAYER_MOD_GET_LAYER(keycode);
if (is_layer_locked(layer)) {
if (record->event.pressed) { // On press, unlock the layer.
layer_lock_invert(layer);
} else { // On release, clear the mods.
clear_mods();
send_keyboard_report();
}
return false; // Skip default handling.
}
} break;
# ifndef NO_ACTION_TAPPING
case QK_LAYER_TAP ... QK_LAYER_TAP_MAX: // `LT(layer, key)` keys.
if (record->tap.count == 0 && !record->event.pressed && is_layer_locked(QK_LAYER_TAP_GET_LAYER(keycode))) {
// Release event on a held layer-tap key where the layer is locked.
return false; // Skip default handling so that layer stays on.
}
break;
# endif // NO_ACTION_TAPPING
}
#endif // NO_ACTION_LAYER
return true;
}

69
quantum/process_keycode/process_layer_lock.h Normal file
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@ -0,0 +1,69 @@
// 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 <stdint.h>
#include <stdbool.h>
#include "action.h"
bool process_layer_lock(uint16_t keycode, keyrecord_t* record);

7
quantum/quantum.c
View File

@ -76,6 +76,10 @@
# include "process_unicode_common.h"
#endif
#ifdef LAYER_LOCK_ENABLE
# include "process_layer_lock.h"
#endif // LAYER_LOCK_ENABLE
#ifdef AUDIO_ENABLE
# ifndef GOODBYE_SONG
# define GOODBYE_SONG SONG(GOODBYE_SOUND)
@ -400,6 +404,9 @@ bool process_record_quantum(keyrecord_t *record) {
#ifdef TRI_LAYER_ENABLE
process_tri_layer(keycode, record) &&
#endif
#ifdef LAYER_LOCK_ENABLE
process_layer_lock(keycode, record) &&
#endif
#ifdef BLUETOOTH_ENABLE
process_connection(keycode, record) &&
#endif

4
quantum/quantum.h
View File

@ -240,6 +240,10 @@ extern layer_state_t layer_state;
# include "os_detection.h"
#endif
#ifdef LAYER_LOCK_ENABLE
# include "layer_lock.h"
#endif // LAYER_LOCK_ENABLE
void set_single_default_layer(uint8_t default_layer);
void set_single_persistent_default_layer(uint8_t default_layer);

8
tests/layer_lock/config.h Normal file
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@ -0,0 +1,8 @@
// Copyright 2021 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include "test_common.h"
#define LAYER_LOCK_IDLE_TIMEOUT 1000

8
tests/layer_lock/test.mk Normal file
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@ -0,0 +1,8 @@
# Copyright 2021 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
# SPDX-License-Identifier: GPL-2.0-or-later
# --------------------------------------------------------------------------------
# Keep this file, even if it is empty, as a marker that this folder contains tests
# --------------------------------------------------------------------------------
LAYER_LOCK_ENABLE = yes

284
tests/layer_lock/test_layer_lock.cpp Normal file
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@ -0,0 +1,284 @@
// Copyright 2021 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
// SPDX-License-Identifier: GPL-2.0-or-later
#include "keycodes.h"
#include "test_common.hpp"
using testing::_;
class LayerLock : public TestFixture {};
TEST_F(LayerLock, LayerLockState) {
TestDriver driver;
KeymapKey key_a = KeymapKey(0, 0, 0, KC_A);
KeymapKey key_b = KeymapKey(1, 0, 0, KC_B);
KeymapKey key_c = KeymapKey(2, 0, 0, KC_C);
KeymapKey key_d = KeymapKey(3, 0, 0, KC_C);
set_keymap({key_a, key_b, key_c, key_d});
EXPECT_FALSE(is_layer_locked(1));
EXPECT_FALSE(is_layer_locked(2));
EXPECT_FALSE(is_layer_locked(3));
layer_lock_invert(1); // Layer 1: unlocked -> locked
layer_lock_on(2); // Layer 2: unlocked -> locked
layer_lock_off(3); // Layer 3: stays unlocked
// Layers 1 and 2 are now on.
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(layer_state_is(2));
// Layers 1 and 2 are now locked.
EXPECT_TRUE(is_layer_locked(1));
EXPECT_TRUE(is_layer_locked(2));
EXPECT_FALSE(is_layer_locked(3));
layer_lock_invert(1); // Layer 1: locked -> unlocked
layer_lock_on(2); // Layer 2: stays locked
layer_lock_on(3); // Layer 3: unlocked -> locked
EXPECT_FALSE(layer_state_is(1));
EXPECT_TRUE(layer_state_is(2));
EXPECT_TRUE(layer_state_is(3));
EXPECT_FALSE(is_layer_locked(1));
EXPECT_TRUE(is_layer_locked(2));
EXPECT_TRUE(is_layer_locked(3));
layer_lock_invert(1); // Layer 1: unlocked -> locked
layer_lock_off(2); // Layer 2: locked -> unlocked
EXPECT_TRUE(layer_state_is(1));
EXPECT_FALSE(layer_state_is(2));
EXPECT_TRUE(layer_state_is(3));
EXPECT_TRUE(is_layer_locked(1));
EXPECT_FALSE(is_layer_locked(2));
EXPECT_TRUE(is_layer_locked(3));
layer_lock_all_off(); // Layers 1 and 3: locked -> unlocked
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(layer_state_is(2));
EXPECT_FALSE(layer_state_is(3));
EXPECT_FALSE(is_layer_locked(1));
EXPECT_FALSE(is_layer_locked(2));
EXPECT_FALSE(is_layer_locked(3));
}
TEST_F(LayerLock, LayerLockMomentaryTest) {
TestDriver driver;
KeymapKey key_layer = KeymapKey(0, 0, 0, MO(1));
KeymapKey key_a = KeymapKey(0, 1, 0, KC_A);
KeymapKey key_trns = KeymapKey(1, 0, 0, KC_TRNS);
KeymapKey key_ll = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
set_keymap({key_layer, key_a, key_trns, key_ll});
EXPECT_NO_REPORT(driver);
key_layer.press();
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
tap_key(key_ll);
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
key_layer.release();
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
// Pressing Layer Lock again unlocks the lock.
EXPECT_NO_REPORT(driver);
key_ll.press();
run_one_scan_loop();
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
}
TEST_F(LayerLock, LayerLockLayerTapTest) {
TestDriver driver;
KeymapKey key_layer = KeymapKey(0, 0, 0, LT(1, KC_B));
KeymapKey key_a = KeymapKey(0, 1, 0, KC_A);
KeymapKey key_trns = KeymapKey(1, 0, 0, KC_TRNS);
KeymapKey key_ll = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
set_keymap({key_layer, key_a, key_trns, key_ll});
EXPECT_NO_REPORT(driver);
key_layer.press();
idle_for(TAPPING_TERM);
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
tap_key(key_ll);
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
// Pressing Layer Lock again unlocks the lock.
EXPECT_NO_REPORT(driver);
key_ll.press();
run_one_scan_loop();
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
}
TEST_F(LayerLock, LayerLockOneshotTapTest) {
TestDriver driver;
KeymapKey key_layer = KeymapKey(0, 0, 0, OSL(1));
KeymapKey key_a = KeymapKey(0, 1, 0, KC_A);
KeymapKey key_trns = KeymapKey(1, 0, 0, KC_TRNS);
KeymapKey key_ll = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
set_keymap({key_layer, key_a, key_trns, key_ll});
EXPECT_NO_REPORT(driver);
tap_key(key_layer);
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
tap_key(key_ll);
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
// Pressing Layer Lock again unlocks the lock.
EXPECT_NO_REPORT(driver);
key_ll.press();
run_one_scan_loop();
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
}
TEST_F(LayerLock, LayerLockOneshotHoldTest) {
TestDriver driver;
KeymapKey key_layer = KeymapKey(0, 0, 0, OSL(1));
KeymapKey key_a = KeymapKey(0, 1, 0, KC_A);
KeymapKey key_trns = KeymapKey(1, 0, 0, KC_TRNS);
KeymapKey key_ll = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
set_keymap({key_layer, key_a, key_trns, key_ll});
EXPECT_NO_REPORT(driver);
key_layer.press();
idle_for(TAPPING_TERM);
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
tap_key(key_ll);
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
key_layer.release();
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
// Pressing Layer Lock again unlocks the lock.
EXPECT_NO_REPORT(driver);
key_ll.press();
run_one_scan_loop();
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
}
TEST_F(LayerLock, LayerLockTimeoutTest) {
TestDriver driver;
KeymapKey key_layer = KeymapKey(0, 0, 0, MO(1));
KeymapKey key_a = KeymapKey(0, 1, 0, KC_A);
KeymapKey key_trns = KeymapKey(1, 0, 0, KC_TRNS);
KeymapKey key_ll = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
set_keymap({key_layer, key_a, key_trns, key_ll});
EXPECT_NO_REPORT(driver);
key_layer.press();
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
tap_key(key_ll);
EXPECT_TRUE(layer_state_is(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
key_layer.release();
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
idle_for(LAYER_LOCK_IDLE_TIMEOUT);
run_one_scan_loop();
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
}
TEST_F(LayerLock, ToKeyOverridesLayerLock) {
TestDriver driver;
KeymapKey key_layer = KeymapKey(0, 0, 0, MO(1));
KeymapKey key_to0 = KeymapKey(1, 0, 0, TO(0));
KeymapKey key_ll = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
set_keymap({key_layer, key_to0, key_ll});
EXPECT_NO_REPORT(driver);
layer_lock_on(1);
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
EXPECT_NO_REPORT(driver);
tap_key(key_to0); // TO(0) overrides Layer Lock and unlocks layer 1.
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
}
TEST_F(LayerLock, LayerClearOverridesLayerLock) {
TestDriver driver;
KeymapKey key_layer = KeymapKey(0, 0, 0, MO(1));
KeymapKey key_a = KeymapKey(0, 1, 0, KC_A);
KeymapKey key_ll = KeymapKey(1, 1, 0, QK_LAYER_LOCK);
set_keymap({key_layer, key_a, key_ll});
EXPECT_NO_REPORT(driver);
layer_lock_on(1);
run_one_scan_loop();
EXPECT_TRUE(layer_state_is(1));
EXPECT_TRUE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
EXPECT_REPORT(driver, (KC_A));
layer_clear(); // layer_clear() overrides Layer Lock and unlocks layer 1.
key_a.press();
run_one_scan_loop();
EXPECT_FALSE(layer_state_is(1));
EXPECT_FALSE(is_layer_locked(1));
VERIFY_AND_CLEAR(driver);
}

1
tests/test_common/keycode_table.cpp
View File

@ -699,6 +699,7 @@ std::map<uint16_t, std::string> KEYCODE_ID_TABLE = {
{QK_TRI_LAYER_UPPER, "QK_TRI_LAYER_UPPER"},
{QK_REPEAT_KEY, "QK_REPEAT_KEY"},
{QK_ALT_REPEAT_KEY, "QK_ALT_REPEAT_KEY"},
{QK_LAYER_LOCK, "QK_LAYER_LOCK"},
{QK_KB_0, "QK_KB_0"},
{QK_KB_1, "QK_KB_1"},
{QK_KB_2, "QK_KB_2"},