FlutterEmbedder constructor

FlutterEmbedder(Rectangle<int> size, DartProject project, String flutterLibrary)

Creates an instance of the FlutterEmbedder for embedding Flutter in a Windows application.

• size: The dimensions of the embedded Flutter view.
• project: Information about the Dart project.
• flutterLibrary: The path to the Flutter engine library.

Implementation

FlutterEmbedder(
  math.Rectangle<int> size,
  DartProject project,
  String flutterLibrary,
) {
  // Load the Windows engine
  final library = DynamicLibrary.open(flutterLibrary);
  flutter = FlutterEngineLibrary(library);

  // SymInitialize has already been called when Dart starts. When we invoke
  // the engine, it's called again, which leads to a "Failed to init
  // NativeSymbolResolver (SymInitialize 87)" error. So we clean up before we
  // call the engine.
  final hProcess = GetCurrentProcess();
  SymCleanup(hProcess);

  using((arena) {
    final engineProperties = arena<FlutterDesktopEngineProperties>();
    engineProperties.ref
      ..aot_library_path =
          project.aotLibraryPath.toNativeUtf16(allocator: arena)
      ..icu_data_path = project.icuDataPath.toNativeUtf16(allocator: arena)
      ..assets_path = project.assetsPath.toNativeUtf16(allocator: arena);
    engine = flutter.FlutterDesktopEngineCreate(engineProperties);
  });

  messenger = flutter.FlutterDesktopEngineGetMessenger(engine);
  if (messenger == nullptr) throw Exception('Failed to create messenger.');

  controller = flutter.FlutterDesktopViewControllerCreate(
    size.width,
    size.height,
    engine,
  );
  if (controller == nullptr) {
    throw Exception('Failed to create view controller.');
  }

  view = flutter.FlutterDesktopViewControllerGetView(controller);
  if (view == nullptr) {
    throw Exception('Failed to create view from controller.');
  }
}