text: // 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.
  // ----------------------------------------------------------------------------
  
  #pragma once
  
  #include <string>
  #include <vector>
  
  #include "FileDialog.h"
  
  struct GLFWwindow;
  
  namespace open3d {
  namespace visualization {
  namespace gui {
  
  void* GetNativeDrawable(GLFWwindow* glfw_window);
  // Note that Windows cannot post an expose event so it must draw immediately.
  // Therefore this function cannot be called while drawing.
  void PostNativeExposeEvent(GLFWwindow* glfw_window);
  void ShowNativeAlert(const char* message);
  
  #ifdef __APPLE__
  void MacTransformIntoApp();
  void SetNativeMenubar(void* menubar);
  #endif  // __APPLE_
  
  #if defined(__APPLE__) || defined(_WIN32)
  void ShowNativeFileDialog(
          FileDialog::Mode mode,
          const std::string& path,
          const std::vector<std::pair<std::string, std::string>>& filters,
          std::function<void(const char*)> on_ok,
          std::function<void()> on_cancel);
  #endif  // __APPLE__ || _WIN32
  
  }  // namespace gui
  }  // namespace visualization
  }  // namespace open3d
  