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/*
* Copyright 2021 Jonas Gessner
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "action_layer.h"
/**
* Key overrides allow you to send a different key-modifier combination or perform a custom action when a certain modifier-key combination is pressed.
*
* For example, you may configure a key override to send the delete key when shift + backspace are pressed together, or that your volume keys become screen brightness keys when holding ctrl. The possibilities are quite vast and the documentation contains a few examples for inspiration.
*
* See the documentation and examples here: https://docs.qmk.fm/#/feature_key_overrides
*/
/** Bitfield with various options controlling the behavior of a key override. */
typedef enum {
/** Allow activating when the trigger key is pressed down. */
ko_option_activation_trigger_down = (1 << 0),
/** Allow activating when a necessary modifier is pressed down. */
ko_option_activation_required_mod_down = (1 << 1),
/** Allow activating when a negative modifier is released. */
ko_option_activation_negative_mod_up = (1 << 2),
ko_options_all_activations = ko_option_activation_negative_mod_up | ko_option_activation_required_mod_down | ko_option_activation_trigger_down,
/** If set, any of the modifiers in trigger_mods will be enough to activate the override (logical OR of modifiers). If not set, all the modifiers in trigger_mods have to be pressed (logical AND of modifiers). */
ko_option_one_mod = (1 << 3),
/** If set, the trigger key will never be registered again after the override is deactivated. */
ko_option_no_reregister_trigger = (1 << 4),
/** If set, the override will not deactivate when another key is pressed down. Use only if you really know you need this. */
ko_option_no_unregister_on_other_key_down = (1 << 5),
/** The default options used by the ko_make_xxx functions. */
ko_options_default = ko_options_all_activations,
} ko_option_t;
/** Defines a single key override */
typedef struct {
// The non-modifier keycode that triggers the override. This keycode, and the necessary modifiers (trigger_mods) must be pressed to activate this override. Set this to the keycode of the key that should activate the override. Set to KC_NO to require only the necessary modifiers to be pressed and no non-modifier.
uint16_t trigger;
// Which mods need to be down for activation. If both sides of a modifier are set (e.g. left ctrl and right ctrl) then only one is required to be pressed (e.g. left ctrl suffices). Use the MOD_MASK_XXX and MOD_BIT() macros for this.
uint8_t trigger_mods;
// This is a BITMASK (!), defining which layers this override applies to. To use this override on layer i set the ith bit (1 << i).
layer_state_t layers;
// Which modifiers cannot be down. It must hold that (active_mods & negative_mod_mask) == 0, otherwise the key override will not be activated. An active override will be deactivated once this is no longer true.
uint8_t negative_mod_mask;
// Modifiers to 'suppress' while the override is active. To suppress a modifier means that even though the modifier key is held down, the host OS sees the modifier as not pressed. Can be used to suppress the trigger modifiers, as a trivial example.
uint8_t suppressed_mods;
// The complex keycode to send as replacement when this override is triggered. This can be a simple keycode, a key-modifier combination (e.g. C(KC_A)), or KC_NO (to register no replacement keycode). Use in combination with suppressed_mods to get the correct modifiers to be sent.
uint16_t replacement;
// Options controlling the behavior of the override, such as what actions are allowed to activate the override.
ko_option_t options;
// If not NULL, this function will be called right before the replacement key is registered, along with the provided context and a flag indicating whether the override was activated or deactivated. This function allows you to run some custom actions for specific key overrides. If you return `false`, the replacement key is not registered/unregistered as it would normally. Return `true` to register and unregister the override normally.
bool (*custom_action)(bool activated, void *context);
// A context that will be passed to the custom action function.
void *context;
// If this points to false this override will not be used. Set to NULL to always have this override enabled.
bool *enabled;
} key_override_t;
/** Define this as a null-terminated array of pointers to key overrides. These key overrides will be used by qmk. */
extern const key_override_t **key_overrides;
/** Turns key overrides on */
void key_override_on(void);
/** Turns key overrides off */
void key_override_off(void);
/** Toggles key overrides on */
void key_override_toggle(void);
/** Returns whether key overrides are enabled */
bool key_override_is_enabled(void);
/** Handling of key overrides and its implemented keycodes */
bool process_key_override(const uint16_t keycode, const keyrecord_t *const record);
/** Perform any deferred keys */
void key_override_task(void);
/**
* Preferrably use these macros to create key overrides. They fix many of the options to a standard setting that should satisfy most basic use-cases. Only directly create a key_override_t struct when you really need to.
*/
// clang-format off
/**
* Convenience initializer to create a basic key override. Activates the override on all layers.
*/
#define ko_make_basic(trigger_mods, trigger_key, replacement_key) \
ko_make_with_layers(trigger_mods, trigger_key, replacement_key, ~0)
/**
* Convenience initializer to create a basic key override. Provide a bitmap (of type layer_state_t) with the bits set for each layer on which the override should activate.
*/
#define ko_make_with_layers(trigger_mods, trigger_key, replacement_key, layers) \
ko_make_with_layers_and_negmods(trigger_mods, trigger_key, replacement_key, layers, 0)
/**
* Convenience initializer to create a basic key override. Provide a bitmap with the bits set for each layer on which the override should activate. Also provide a negative modifier mask, that is used to define which modifiers may not be pressed.
*/
#define ko_make_with_layers_and_negmods(trigger_mods, trigger_key, replacement_key, layers, negative_mask) \
ko_make_with_layers_negmods_and_options(trigger_mods, trigger_key, replacement_key, layers, negative_mask, ko_options_default)
/**
* Convenience initializer to create a basic key override. Provide a bitmap with the bits set for each layer on which the override should activate. Also provide a negative modifier mask, that is used to define which modifiers may not be pressed. Provide options for additional control of the behavior of the override.
*/
#define ko_make_with_layers_negmods_and_options(trigger_mods_, trigger_key, replacement_key, layer_mask, negative_mask, options_) \
((const key_override_t){ \
.trigger_mods = (trigger_mods_), \
.layers = (layer_mask), \
.suppressed_mods = (trigger_mods_), \
.options = (options_), \
.negative_mod_mask = (negative_mask), \
.custom_action = NULL, \
.context = NULL, \
.trigger = (trigger_key), \
.replacement = (replacement_key), \
.enabled = NULL \
})
// clang-format on
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