[Keyboard] Add Encoder map support for rart (#18851)

keyboards/rart/rart75/keymaps/via/keymap.c

@@ -40,13 +40,11 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
 };
 
-bool encoder_update_user(uint8_t index, bool clockwise) {
-    if (index == 0) { /* First encoder */
-        if (clockwise) {
-            tap_code(KC_VOLU);
-        } else {
-            tap_code(KC_VOLD);
-        }
-    }
-    return true;
-}
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][2] = {
+    [0] = { ENCODER_CCW_CW(KC_VOLU, KC_VOLD) },
+    [1] = { ENCODER_CCW_CW(KC_TRNS, KC_TRNS) },
+    [2] = { ENCODER_CCW_CW(KC_TRNS, KC_TRNS) },
+    [3] = { ENCODER_CCW_CW(KC_TRNS, KC_TRNS) }
+};
+#endif

keyboards/rart/rart75/keymaps/via/rules.mk

@@ -1,2 +1,4 @@
 VIA_ENABLE = yes
 LTO_ENABLE = yes
+ENCODER_MAP_ENABLE = yes
+