（四）UE4编辑器菜单按钮

1. 主菜单的按钮

参考https://alanwalk.github.io/2018/04/17/how-to-add-ue4-editor-menu/

2. Tab上的按钮

3. Tab上的菜单怎么构建呢？

主要是构建菜单栏的SWidge，然后添加到最上面的布局中就可以了。

所有的菜单栏，都是通过FExtender构建的，

TSharedRef< SWidget >  FTestEditorModule::Test()
{inTabMgr = FGlobalTabmanager::Get();TSharedPtr<FExtender> MenuBarExtender = MakeShareable(new FExtender());MenuBarExtender->AddMenuBarExtension("Help",EExtensionHook::After,NULL,FMenuBarExtensionDelegate::CreateRaw(this, &FTestEditorModule::AddMenuBarExtension));FTestEditorModule& TestEditorModule = FModuleManager::LoadModuleChecked<FTestEditorModule>(TestEditorTabName);MenuExtensibilityManager->AddExtender(MenuBarExtender);IMainFrameModule& MainFrameModule = FModuleManager::LoadModuleChecked<IMainFrameModule>( "MainFrame" );TSharedRef< SWidget > MenuBarWidget = MainFrameModule.MakeMainTabMenu( inTabMgr, MenuBarExtender.ToSharedRef() );return MenuBarWidget;
}

这里构建MenuBarExtender之后，使用的是 MainFrameModule.MakeMainTabMenu构建了SWidget，看一下创建的代码


TSharedRef< SWidget > FMainMenu::MakeMainTabMenu( const TSharedPtr<FTabManager>& TabManager, const TSharedRef< FExtender > UserExtender )
{   struct Local{static void FillProjectMenuItems( FMenuBuilder& MenuBuilder ){MenuBuilder.BeginSection( "FileProject", LOCTEXT("ProjectHeading", "Project") );{MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().NewProject );MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().OpenProject );FText ShortIDEName = FSourceCodeNavigation::GetSelectedSourceCodeIDE();MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().AddCodeToProject,NAME_None,TAttribute<FText>(),FText::Format(LOCTEXT("AddCodeToProjectTooltip", "Adds C++ code to the project. The code can only be compiled if you have {0} installed."), ShortIDEName));MenuBuilder.AddSubMenu(LOCTEXT("PackageProjectSubMenuLabel", "Package Project"),LOCTEXT("PackageProjectSubMenuToolTip", "Compile, cook and package your project and its content for distribution."),FNewMenuDelegate::CreateStatic( &FPackageProjectMenu::MakeMenu ), false, FSlateIcon(FEditorStyle::GetStyleSetName(), "MainFrame.PackageProject"));/*MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().LocalizeProject,NAME_None,TAttribute<FText>(),LOCTEXT("LocalizeProjectToolTip", "Gather text from your project and import/export translations."));*//*MenuBuilder.AddSubMenu(LOCTEXT("CookProjectSubMenuLabel", "Cook Project"),LOCTEXT("CookProjectSubMenuToolTip", "Cook your project content for debugging"),FNewMenuDelegate::CreateStatic( &FCookContentMenu::MakeMenu ), false, FSlateIcon());*/FString SolutionPath;if (FSourceCodeNavigation::DoesModuleSolutionExist()){MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().RefreshCodeProject,NAME_None,FText::Format(LOCTEXT("RefreshCodeProjectLabel", "Refresh {0} Project"), ShortIDEName),FText::Format(LOCTEXT("RefreshCodeProjectTooltip", "Refreshes your C++ code project in {0}."), ShortIDEName));MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().OpenIDE,NAME_None,FText::Format(LOCTEXT("OpenIDELabel", "Open {0}"), ShortIDEName),FText::Format(LOCTEXT("OpenIDETooltip", "Opens your C++ code in {0}."), ShortIDEName));}else{MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().RefreshCodeProject,NAME_None,FText::Format(LOCTEXT("GenerateCodeProjectLabel", "Generate {0} Project"), ShortIDEName),FText::Format(LOCTEXT("GenerateCodeProjectTooltip", "Generates your C++ code project in {0}."), ShortIDEName));}// @hack GDC: this should be moved somewhere else and be less hackyITargetPlatform* RunningTargetPlatform = GetTargetPlatformManager()->GetRunningTargetPlatform();if (RunningTargetPlatform != nullptr){const FName CookedPlatformName = *(RunningTargetPlatform->PlatformName() + TEXT("NoEditor"));const FText CookedPlatformText = FText::FromString(RunningTargetPlatform->PlatformName());FUIAction Action(FExecuteAction::CreateStatic(&FMainFrameActionCallbacks::CookContent, CookedPlatformName),FCanExecuteAction::CreateStatic(&FMainFrameActionCallbacks::CookContentCanExecute, CookedPlatformName));MenuBuilder.AddMenuEntry(FText::Format(LOCTEXT("CookContentForPlatform", "Cook Content for {0}"), CookedPlatformText),FText::Format(LOCTEXT("CookContentForPlatformTooltip", "Cook your game content for debugging on the {0} platform"), CookedPlatformText),FSlateIcon(),Action);}}MenuBuilder.EndSection();}static void FillRecentFileAndExitMenuItems( FMenuBuilder& MenuBuilder ){MenuBuilder.BeginSection("FileRecentFiles");{if (GetDefault<UEditorStyleSettings>()->bShowProjectMenus && FMainFrameActionCallbacks::ProjectNames.Num() > 0){MenuBuilder.AddSubMenu(LOCTEXT("SwitchProjectSubMenu", "Recent Projects"),LOCTEXT("SwitchProjectSubMenu_ToolTip", "Select a project to switch to"),FNewMenuDelegate::CreateStatic(&FRecentProjectsMenu::MakeMenu), false, FSlateIcon(FEditorStyle::GetStyleSetName(), "MainFrame.RecentProjects"));}}MenuBuilder.EndSection();#if !PLATFORM_MAC // Handled by app's menu in menu barMenuBuilder.AddMenuSeparator();MenuBuilder.AddMenuEntry( FMainFrameCommands::Get().Exit, "Exit" );
#endif}};FExtensibilityManager ExtensibilityManager;ExtensibilityManager.AddExtender( UserExtender );{TSharedRef< FExtender > Extender( new FExtender() );IMainFrameModule& MainFrameModule = FModuleManager::GetModuleChecked<IMainFrameModule>("MainFrame");if (GetDefault<UEditorStyleSettings>()->bShowProjectMenus){Extender->AddMenuExtension("FileLoadAndSave",EExtensionHook::After,MainFrameModule.GetMainFrameCommandBindings(),FMenuExtensionDelegate::CreateStatic(&Local::FillProjectMenuItems));}Extender->AddMenuExtension("FileLoadAndSave",EExtensionHook::After,MainFrameModule.GetMainFrameCommandBindings(),FMenuExtensionDelegate::CreateStatic( &Local::FillRecentFileAndExitMenuItems ) );ExtensibilityManager.AddExtender( Extender );}TSharedRef< SWidget > MenuBarWidget = FMainMenu::MakeMainMenu( TabManager, ExtensibilityManager.GetAllExtenders().ToSharedRef() );return MenuBarWidget;
}TSharedRef<SWidget> FMainMenu::MakeMainMenu(const TSharedPtr<FTabManager>& TabManager, const TSharedRef< FExtender > Extender)
{
#define LOCTEXT_NAMESPACE "MainMenu"// Cache all project names onceFMainFrameActionCallbacks::CacheProjectNames();FMenuBarBuilder MenuBuilder(FMainFrameCommands::ActionList, Extender);{// FileMenuBuilder.AddPullDownMenu( LOCTEXT("FileMenu", "File"),LOCTEXT("FileMenu_ToolTip", "Open the file menu"),FNewMenuDelegate::CreateStatic(&FMainMenu::FillFileMenu, Extender),"File",FName(TEXT("FileMenu")));// EditMenuBuilder.AddPullDownMenu( LOCTEXT("EditMenu", "Edit"),LOCTEXT("EditMenu_ToolTip", "Open the edit menu"),FNewMenuDelegate::CreateStatic(&FMainMenu::FillEditMenu, Extender, TabManager),"Edit",FName(TEXT("EditMenu")));// WindowMenuBuilder.AddPullDownMenu(LOCTEXT("WindowMenu", "Window"),LOCTEXT("WindowMenu_ToolTip", "Open new windows or tabs."),FNewMenuDelegate::CreateStatic(&FMainMenu::FillWindowMenu, Extender, TabManager),"Window");// HelpMenuBuilder.AddPullDownMenu( LOCTEXT("HelpMenu", "Help"),LOCTEXT("HelpMenu_ToolTip", "Open the help menu"),FNewMenuDelegate::CreateStatic(&FMainMenu::FillHelpMenu, Extender),"Help");}// Create the menu bar!TSharedRef<SWidget> MenuBarWidget = MenuBuilder.MakeWidget();// Tell tab-manager about the multi-box for platforms with a global menu barTabManager->SetMenuMultiBox(MenuBuilder.GetMultiBox());return MenuBarWidget;
}

最后是构建了一个MenuBarWidget，如果需要自定义Menu，可以参考着个代码自己创建一个函数。

这里自动构建了一个Menu bar。

最后添加到Widget中

4. Tab上的ToolBar

// 创建的代码
TSharedRef<FUICommandList> CommandList = MakeShareable(new FUICommandList);
FToolBarBuilder ToolbarBuilder( CommandList, FMultiBoxCustomization::None );
ToolbarBuilder.BeginSection("CurveEditorFit");
{ToolbarBuilder.AddToolBarButton(FProEditorCommands::Get().OpenPluginWindow);ToolbarBuilder.AddToolBarButton(FProEditorCommands::Get().OpenPluginWindow);ToolbarBuilder.AddToolBarButton(FProEditorCommands::Get().OpenPluginWindow);
}
ToolbarBuilder.EndSection();
return SNew(SDockTab).TabRole(ETabRole::NomadTab)[// Put your tab content here!SNew(SVerticalBox)+SVerticalBox::Slot().MaxHeight(50)[ToolbarBuilder.MakeWidget()]]

也是获取ToolBarBuilder的布局，然后加入父类的布局中

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