149 lines
8.4 KiB
C
149 lines
8.4 KiB
C
/*
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* Copyright 2021 Jonas Gessner
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include "action.h"
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#include "action_layer.h"
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/**
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* Key overrides allow you to send a different key-modifier combination or perform a custom action when a certain modifier-key combination is pressed.
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*
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* 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.
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*
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* See the documentation and examples here: https://docs.qmk.fm/#/feature_key_overrides
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*/
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/** Bitfield with various options controlling the behavior of a key override. */
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typedef enum {
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/** Allow activating when the trigger key is pressed down. */
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ko_option_activation_trigger_down = (1 << 0),
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/** Allow activating when a necessary modifier is pressed down. */
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ko_option_activation_required_mod_down = (1 << 1),
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/** Allow activating when a negative modifier is released. */
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ko_option_activation_negative_mod_up = (1 << 2),
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ko_options_all_activations = ko_option_activation_negative_mod_up | ko_option_activation_required_mod_down | ko_option_activation_trigger_down,
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/** 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). */
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ko_option_one_mod = (1 << 3),
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/** If set, the trigger key will never be registered again after the override is deactivated. */
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ko_option_no_reregister_trigger = (1 << 4),
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/** If set, the override will not deactivate when another key is pressed down. Use only if you really know you need this. */
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ko_option_no_unregister_on_other_key_down = (1 << 5),
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/** The default options used by the ko_make_xxx functions. */
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ko_options_default = ko_options_all_activations,
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} ko_option_t;
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/** Defines a single key override */
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typedef struct key_override_t {
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// 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.
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uint16_t trigger;
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// 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.
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uint8_t trigger_mods;
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// This is a BITMASK (!), defining which layers this override applies to. To use this override on layer i set the ith bit (1 << i).
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layer_state_t layers;
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// 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.
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uint8_t negative_mod_mask;
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// 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.
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uint8_t suppressed_mods;
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// 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.
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uint16_t replacement;
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// Options controlling the behavior of the override, such as what actions are allowed to activate the override.
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ko_option_t options;
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// 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.
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bool (*custom_action)(bool activated, void *context);
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// A context that will be passed to the custom action function.
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void *context;
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// If this points to false this override will not be used. Set to NULL to always have this override enabled.
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bool *enabled;
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} key_override_t;
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/** Turns key overrides on */
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void key_override_on(void);
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/** Turns key overrides off */
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void key_override_off(void);
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/** Toggles key overrides on */
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void key_override_toggle(void);
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/** Returns whether key overrides are enabled */
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bool key_override_is_enabled(void);
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/** Handling of key overrides and its implemented keycodes */
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bool process_key_override(const uint16_t keycode, const keyrecord_t *const record);
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/** Perform any deferred keys */
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void key_override_task(void);
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/**
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* 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.
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*/
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// clang-format off
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/**
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* Convenience initializer to create a basic key override. Activates the override on all layers.
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*/
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#define ko_make_basic(trigger_mods, trigger_key, replacement_key) \
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ko_make_with_layers(trigger_mods, trigger_key, replacement_key, ~0)
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/**
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* 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.
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*/
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#define ko_make_with_layers(trigger_mods, trigger_key, replacement_key, layers) \
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ko_make_with_layers_and_negmods(trigger_mods, trigger_key, replacement_key, layers, 0)
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/**
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* 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.
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*/
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#define ko_make_with_layers_and_negmods(trigger_mods, trigger_key, replacement_key, layers, negative_mask) \
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ko_make_with_layers_negmods_and_options(trigger_mods, trigger_key, replacement_key, layers, negative_mask, ko_options_default)
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/**
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* 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.
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*/
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#define ko_make_with_layers_negmods_and_options(trigger_mods_, trigger_key, replacement_key, layer_mask, negative_mask, options_) \
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((const key_override_t){ \
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.trigger_mods = (trigger_mods_), \
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.layers = (layer_mask), \
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.suppressed_mods = (trigger_mods_), \
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.options = (options_), \
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.negative_mod_mask = (negative_mask), \
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.custom_action = NULL, \
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.context = NULL, \
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.trigger = (trigger_key), \
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.replacement = (replacement_key), \
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.enabled = NULL \
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})
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// clang-format on
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