class FEdgeEditorModule : public IModuleInterface
{
public:
    virtual void StartupModule() override;
    virtual void ShutdownModule() override;
    void AddMenu(FMenuBarBuilder& MenuBarBuilder);
    void FileMenu(FMenuBuilder& MenuBuilder);
};

void FEdgeEditorModule::StartupModule()
{
  	// 在LevelEditor注册扩展
    FLevelEditorModule& LevelEditorModule = FModuleManager::LoadModuleChecked<FLevelEditorModule>("LevelEditor");
    const TSharedPtr<FExtender> MenuExtender = MakeShareable(new FExtender());
    MenuExtender->AddMenuBarExtension("Help", EExtensionHook::After, nullptr, FMenuBarExtensionDelegate::CreateRaw(this, &FEdgeEditorModule::AddMenu));
    LevelEditorModule.GetMenuExtensibilityManager()->AddExtender(MenuExtender);
}

void FEdgeEditorModule::AddMenu(FMenuBarBuilder& MenuBarBuilder)
{
  	// 创建一个下拉菜单
    MenuBarBuilder.AddPullDownMenu(FText::FromString("Hard Edge"), FText::FromString("Hard Edge Tools"), FNewMenuDelegate::CreateRaw(this, &FEdgeEditorModule::FileMenu));
}
void FEdgeEditorModule::FileMenu(FMenuBuilder& MenuBuilder)
{
  	// 下拉菜单中添加一个选项，点击后会输出Log
    MenuBuilder.AddMenuEntry(FText::FromString("A Tool"), FText::FromString("A Tool Tooltip"), FSlateIcon(), FUIAction(FExecuteAction::CreateLambda([]()
    {
        UE_LOG(LogEdgeEditor, Log, TEXT("A Tool Clicked"));
    })));
}

// 在.h文件中定义
DECLARE_LOG_CATEGORY_EXTERN(LogEdgeEditor, All, All);

// 在 .cpp文件中实现，注意不能重复实现
DEFINE_LOG_CATEGORY(LogEdgeEditor);