+#### Example
+
+```c
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+ switch (keycode) {
+ case LOWER:
+ if (record->event.pressed) {
+ layer_on(_LOWER);
+ update_tri_layer(_LOWER, _RAISE, _ADJUST);
+ } else {
+ layer_off(_LOWER);
+ update_tri_layer(_LOWER, _RAISE, _ADJUST);
+ }
+ return false;
+ break;
+ case RAISE:
+ if (record->event.pressed) {
+ layer_on(_RAISE);
+ update_tri_layer(_LOWER, _RAISE, _ADJUST);
+ } else {
+ layer_off(_RAISE);
+ update_tri_layer(_LOWER, _RAISE, _ADJUST);
+ }
+ return false;
+ break;
+ }
+ return true;
+}
+```
+
+### `update_tri_layer_state(state, x, y, z)`
+The other function is `update_tri_layer_state(state, x, y, z)`. This function is meant to be called from they [`layer_state_set_*` functions](custom_quantum_functions.md#layer-change-code). This means that any time that you use a keycode to change the layer, this will be checked. So you could use `LT(layer, kc)` to change the layer and it will trigger the same layer check.
+
+The caveat to this method is that you cannot access the `z` layer without having `x` and `y` layers on, since if you try to activate just layer `z`, it will run this code and turn off layer `z` before you could use it.
+
+#### Example
+
+```c
+uint32_t layer_state_set_user(uint32_t state) {
+ return update_tri_layer_state(state, _LOWER, _RAISE, _ADJUST);
+}
+```
+
+Alternatively, you don't have to immediately "return" the value. This is useful if you want to add multiple tri layers, or if you want to add additional effects.
+
+```c
+uint32_t layer_state_set_user(uint32_t state) {
+ state = update_tri_layer_state(state, _LOWER, _RAISE, _ADJUST);
+ state = update_tri_layer_state(state, _RAISE, _SYMB, _SPECIAL);
+ return state;
+}
+```