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windows/runner/flutter_window.h

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+#ifndef RUNNER_FLUTTER_WINDOW_H_
+#define RUNNER_FLUTTER_WINDOW_H_
+
+
+#include <flutter/dart_project.h>
+#include <flutter/flutter_view_controller.h>
+
+#include <memory>
+#include "flutter/method_channel.h"
+#include "flutter/plugin_registrar_windows.h"
+#include "flutter/standard_method_codec.h"
+#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();
+
+  auto GetMessenger() -> flutter::BinaryMessenger* {
+    return flutter_controller_ ? flutter_controller_->engine()->messenger() : nullptr;
+  }
+
+ 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_;
+  std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>> message_channel_;
+  std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>> registrar_;
+  void CreateMessageChannel();
+  static void HandleMethodCall(
+      const flutter::MethodCall<flutter::EncodableValue>& method_call,
+      std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result);
+};
+
+#endif  // RUNNER_FLUTTER_WINDOW_H_