qmk_firmware/keyboards/a_dux/keymaps/daliusd/oneshot.h

/* Copyright 2021 @daliusd
 *
 * 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 QMK_KEYBOARD_H

// Represents the four states a oneshot key can be in
typedef enum {
    os_up_unqueued,
    os_up_queued,
    os_up_queued_used,
    os_down_unused,
    os_down_used,
} oneshot_state;

// Custom oneshot mod implementation that doesn't rely on timers. If a mod is
// used while it is held it will be unregistered on keyup as normal, otherwise
// it will be queued and only released after the next non-mod keyup.
void update_oneshot(
    oneshot_state *state,
    uint16_t mod,
    uint16_t trigger,
    uint16_t keycode,
    keyrecord_t *record
);

// Oneshot implementation for layers
bool update_oneshot_layer(
    oneshot_state *state,
    uint16_t layer,
    uint16_t trigger,
    uint16_t keycode,
    keyrecord_t *record
);

// To be implemented by the consumer. Layers one shot implementation needs to
// know which keys are used as oneshot mods
bool is_oneshot_mod_key(
    uint16_t keycode
);

// To be implemented by the consumer. Defines keys to cancel oneshot mods.
bool is_oneshot_cancel_key(uint16_t keycode);

// To be implemented by the consumer. Defines keys to cancel oneshot layers.
bool is_oneshot_layer_cancel_key(uint16_t keycode);

// To be implemented by the consumer. Defines keys to ignore when determining
// whether a oneshot mod has been used. Setting this to modifiers and layer
// change keys allows stacking multiple oneshot modifiers, and carrying them
// between layers.
bool is_oneshot_ignored_key(uint16_t keycode);