halkyon/apps/learn/halkyon_learn_flutter/windows/runner/flutter_window.h

#ifndef RUNNER_FLUTTER_WINDOW_H_
#define RUNNER_FLUTTER_WINDOW_H_

#include <flutter/dart_project.h>
#include <flutter/encodable_value.h>
#include <flutter/flutter_view_controller.h>
#include <flutter/method_channel.h>

#include <memory>

#include "win32_window.h"

// A window that does nothing but host a Flutter view.
class FlutterWindow : public Win32Window {
 public:
  // Creates a new FlutterWindow hosting a Flutter view running |project|.
  explicit FlutterWindow(const flutter::DartProject& project);
  virtual ~FlutterWindow();

 protected:
  // Win32Window:
  bool OnCreate() override;
  void OnDestroy() override;
  LRESULT MessageHandler(HWND window, UINT const message, WPARAM const wparam,
                         LPARAM const lparam) noexcept override;

 private:
  // The project to run.
  flutter::DartProject project_;

  // The Flutter instance hosted by this window.
  std::unique_ptr<flutter::FlutterViewController> flutter_controller_;

  // The channel halkyon_app's SecretScreen asks to keep the window out of
  // screen captures while something secret shows (the recovery phrase,
  // recovery codes, an authenticator's key), and how many show: counted, as
  // several may at once.
  std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>>
      screen_guard_;
  int secrets_shown_ = 0;

  // Answers |screen_guard_|.
  void GuardScreen();
};

#endif  // RUNNER_FLUTTER_WINDOW_H_