tangara-fw/src/ui/wheel_encoder.cpp

/*
 * 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