text: /*
  * The MIT License (MIT)
  *
  * IziEditor
  * Copyright (c) 2015 Martin Newhouse
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in all
  * copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
  
  #ifndef SCENE_LOADER_HPP
  #define SCENE_LOADER_HPP
  
  #include <memory>
  #include <atomic>
  #include <future>
  #include <functional>
  
  namespace components
  {
      class Track;
  }
  
  namespace scene
  {
      class Scene;
  
      enum class LoadingState
      {
          Preprocessing,
          LoadingImages,
          LoadingPatterns,
          MappingTiles,
          BuildingScene
      };
  
      class SceneLoader
      {
      public:
          void async_load_scene(std::function<components::Track()> load_track);
  
          bool is_loading() const;
          bool is_finished() const;
  
          LoadingState loading_state() const;
          double loading_progress() const;
          double max_progress() const;
  
          std::unique_ptr<Scene> get_result();
  
      private:
          std::unique_ptr<Scene> load_scene(std::function<components::Track()> load_track);
  
          std::future<std::unique_ptr<Scene>> future_;
  
          std::atomic<LoadingState> loading_state_;
          std::atomic<double> loading_progress_;
          std::atomic<double> max_progress_;
      };
  }
  
  #endif