1 files changed, 39 insertions, 0 deletions
diff --git a/src/ui/wheel_encoder.cpp b/src/ui/wheel_encoder.cpp
new file mode 100644
index 00000000..0129434d
--- /dev/null
+++ b/src/ui/wheel_encoder.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "wheel_encoder.hpp"
+#include "hal/lv_hal_indev.h"
+
+namespace ui {
+
+void encoder_read(lv_indev_drv_t * drv, lv_indev_data_t*data){
+  TouchWheelEncoder *instance = reinterpret_cast<TouchWheelEncoder*>(drv->user_data);
+  instance->Read(data);
+}
+
+  TouchWheelEncoder::TouchWheelEncoder(std::weak_ptr<drivers::RelativeWheel> wheel) : wheel_(wheel) {
+    lv_indev_drv_init(&driver_);
+    driver_.type = LV_INDEV_TYPE_ENCODER;
+    driver_.read_cb = encoder_read;
+    driver_.user_data = this;
+
+    registration_ = lv_indev_drv_register(&driver_);
+  }
+
+auto TouchWheelEncoder::Read(lv_indev_data_t *data) -> void {
+  auto lock = wheel_.lock();
+  if (lock == nullptr) {
+    data->state = LV_INDEV_STATE_RELEASED;
+    data->enc_diff = 0;
+    return;
+  }
+
+  lock->Update();
+  data->state = lock->is_pressed() ? LV_INDEV_STATE_PRESSED : LV_INDEV_STATE_RELEASED;
+  data->enc_diff = lock->ticks();
+}
+
+} // namespace ui