KeyChron K0 Max KeyMap for Different Active RGB Layers - Example

/* Copyright 2025 @ Keychron (https://www.keychron.com)
 *
 * 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/>.
 */

#include QMK_KEYBOARD_H
#include "keychron_common.h"

enum layers {
    BASE,
	L1,
	L2,
	L3,
    FN,
};
// clang-format off
const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    [BASE] = LAYOUT_tenkey_27(
        TO(L1), KC_ESC,  KC_DEL,  KC_TAB,  KC_BSPC,
        KC_PSCR,    KC_NUM,  KC_PSLS, KC_PAST, KC_PMNS,
        MC_2,    KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        MO(L3),    KC_P4,   KC_P5,   KC_P6,
        MO(L2),    KC_P1,   KC_P2,   KC_P3,
        KC_SPC,  KC_P0,            KC_PDOT, KC_PENT ),

    [L1] = LAYOUT_tenkey_27(
        TO(L2), KC_ESC,  KC_DEL,  KC_TAB,  KC_BSPC,
        MC_1,    KC_NUM,  KC_PSLS, KC_PAST, KC_PMNS,
        MC_2,    KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        MC_3,    KC_P4,   KC_P5,   KC_P6,
        MC_4,    KC_P1,   KC_P2,   KC_P3,
        MO(FN),  KC_P0,            KC_PDOT, KC_PENT ),

    [L2] = LAYOUT_tenkey_27(
        TO(L3), KC_ESC,  KC_DEL,  KC_TAB,  KC_BSPC,
        MC_1,    KC_NUM,  KC_PSLS, KC_PAST, KC_PMNS,
        MC_2,    KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        MC_3,    KC_P4,   KC_P5,   KC_P6,
        MC_4,    KC_P1,   KC_P2,   KC_P3,
        MO(FN),  KC_P0,            KC_PDOT, KC_PENT ),

    [L3] = LAYOUT_tenkey_27(
        TO(BASE), KC_ESC,  KC_DEL,  KC_TAB,  KC_BSPC,
        MC_1,    KC_NUM,  KC_PSLS, KC_PAST, KC_PMNS,
        MC_2,    KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        MC_3,    KC_P4,   KC_P5,   KC_P6,
        MC_4,    KC_P1,   KC_P2,   KC_P3,
        MO(FN),  KC_P0,            KC_PDOT, KC_PENT ),

    [FN] = LAYOUT_tenkey_27(
        UG_TOGG, BT_HST1, BT_HST2, BT_HST3, P2P4G,
        _______, UG_NEXT, UG_VALU, UG_HUEU, _______,
        _______, UG_PREV, UG_VALD, UG_HUED, _______,
        _______, UG_SATU, UG_SPDU, KC_MPRV,
        _______, UG_SATD, UG_SPDD, KC_MPLY,
        _______, UG_TOGG,          KC_MNXT, _______),
};

// clang-format on
#if defined(ENCODER_MAP_ENABLE)
const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][2] = {
    [BASE] = {ENCODER_CCW_CW(KC_VOLD, KC_VOLU)},
	[L1] = {ENCODER_CCW_CW(KC_VOLD, KC_VOLU)},
	[L2] = {ENCODER_CCW_CW(KC_VOLD, KC_VOLU)},
	[L3] = {ENCODER_CCW_CW(KC_VOLD, KC_VOLU)},
    [FN]   = {ENCODER_CCW_CW(UG_VALD, UG_VALU)},
};
#endif // ENCODER_MAP_ENABLE

bool rgb_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max) {
    for (uint8_t i = led_min; i < led_max; i++) {
        switch(get_highest_layer(layer_state|default_layer_state)) {
			case FN:
                rgb_matrix_set_color(i, RGB_WHITE);
                break;
			case L3:
                rgb_matrix_set_color(i, RGB_BLUE);
                break;
            case L2:
                rgb_matrix_set_color(i, RGB_RED);
                break;
            case L1:
                rgb_matrix_set_color(i, RGB_YELLOW);
                break;
            default:
				rgb_matrix_set_color(i, RGB_OFF);
                break;
        }
    }
    return false;
}