Bare minimum PlatformViewHandler

shell/platform/windows/platform_view_manager.cc

@@ -4,6 +4,30 @@
 
 #include "flutter/shell/platform/windows/platform_view_manager.h"
 
+#include "flutter/shell/platform/common/client_wrapper/include/flutter/standard_method_codec.h"
+
 namespace flutter {
 
+namespace {
+constexpr char kChannelName[] = "";
+}
+
+PlatformViewManager::PlatformViewManager(TaskRunner* task_runner, BinaryMessenger* binary_messenger) : task_runner_(task_runner), channel_(std::make_unique<MethodChannel<EncodableValue>>(binary_messenger, kChannelName, &StandardMethodCodec::GetInstance())) {
+  channel_->SetMethodCallHandler([](const MethodCall<EncodableValue>& call, std::unique_ptr<MethodResult<EncodableValue>> result){
+    result->Success();
+  });
+}
+
+void PlatformViewManager::QueuePlatformViewCreation(std::string_view type_name, int64_t id) {}
+
+void PlatformViewManager::InstantiatePlatformView(int64_t id) {}
+
+void PlatformViewManager::RegisterPlatformViewType(std::string_view type_name, const FlutterPlatformViewTypeEntry& type) {}
+
+void PlatformViewManager::FocusPlatformView(int64_t id, FocusChangeDirection direction, bool focus) {}
+
+std::optional<HWND> PlatformViewManager::GetNativeHandleForId(int64_t id) const {
+  return std::nullopt;
+}
+
 }  // namespace flutter

shell/platform/windows/platform_view_manager.h

@@ -5,25 +5,46 @@
 #ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_PLATFORM_VIEW_MANAGER_H_
 #define FLUTTER_SHELL_PLATFORM_WINDOWS_PLATFORM_VIEW_MANAGER_H_
 
+#include <functional>
 #include <map>
 #include <memory>
+#include <optional>
 
 #include "flutter/shell/platform/common/client_wrapper/include/flutter/method_channel.h"
 #include "flutter/shell/platform/windows/public/flutter_windows.h"
+#include "flutter/shell/platform/windows/task_runner.h"
 
 namespace flutter {
 
+enum class FocusChangeDirection {
+  kProgrammatic,
+  kForward,
+  kBackward
+};
+
 class PlatformViewManager {
  public:
+  PlatformViewManager(TaskRunner* task_runner, BinaryMessenger* binary_messenger);
+
+  void QueuePlatformViewCreation(std::string_view type_name, int64_t id);
+
+  void InstantiatePlatformView(int64_t id);
 
+  void RegisterPlatformViewType(std::string_view type_name, const FlutterPlatformViewTypeEntry& type);
+
+  void FocusPlatformView(int64_t id, FocusChangeDirection direction, bool focus);
+
+  std::optional<HWND> GetNativeHandleForId(int64_t id) const;
  private:
   std::unique_ptr<MethodChannel<EncodableValue>> channel_;
 
   std::map<std::string, FlutterPlatformViewTypeEntry> platform_view_types_;
 
   std::map<int64_t, HWND> platform_views_;
 
-  std::map<int64_t, FlutterPlatformViewCreationParameters> pending_platform_views_;
+  std::map<int64_t, std::function<HWND()>> pending_platform_views_;
+
+  TaskRunner* task_runner_;
 };
 
 }  // namespace flutter

shell/platform/windows/public/flutter_windows.h

@@ -214,6 +214,7 @@ typedef struct {
 typedef HWND (*FlutterPlatformViewFactory)(const FlutterPlatformViewCreationParameters*);
 
 typedef struct {
+  size_t cb_size;
   FlutterPlatformViewFactory factory;
   void* user_data;
 } FlutterPlatformViewTypeEntry;