qmk_firmware/keyboards/ztboards/after/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

    [0] = LAYOUT_65_ansi_wkl_split_bs(
        QK_GESC, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,     KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSLS, KC_GRV,  KC_HOME  ,
        KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,     KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSPC,          KC_PGUP  ,
        KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,     KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_ENT,                    KC_PGDN  ,
        KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,     KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT, KC_UP  ,          KC_DEL   ,
        KC_LCTL,          KC_LALT,                   KC_SPC,                              MO(1),   KC_RCTL,          KC_LEFT, KC_DOWN,          KC_RGHT
		),

    [1] = LAYOUT_65_ansi_wkl_split_bs(
        QK_BOOT,   KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_INS,  KC_DEL,  KC_TRNS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,          KC_TRNS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                   KC_TRNS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,          KC_TRNS, KC_TRNS,          KC_TRNS,
        KC_TRNS,          KC_TRNS,                   KC_TRNS,                            KC_TRNS, KC_TRNS,          KC_TRNS, KC_TRNS,          KC_TRNS
		)
};


bool encoder_update_user(uint8_t index, bool clockwise) {
  if (index == 0) {
    switch (get_highest_layer(layer_state)) {
      case 1:
        // main layer - move mouse right (CW) and left (CCW)
        if (clockwise) {
          tap_code(KC_BRIGHTNESS_UP);
        } else {
          tap_code(KC_BRIGHTNESS_DOWN);
        }
        break;

      default:
        // other layers - =/+ (quals/plus) (CW) and -/_ (minus/underscore) (CCW)
        if (clockwise) {
          tap_code(KC_AUDIO_VOL_UP);
        } else {
          tap_code(KC_AUDIO_VOL_DOWN);
        }
        break;
    }
  }
    return true;
}