Extending the Editor with FExtender

Example

TSharedPtr<FExtender> TestExtender = MakeShareable(new FExtender);
TestExtender->AddToolBarExtension("CommonActions", EExtensionHook::After, NULL, FToolBarExtensionDelegate::CreateStatic(&FOS_SLV_CommandsCallbacks::BuildToolbar));

FLevelEditorModule& LevelEditorModule = FModuleManager::LoadModuleChecked<FLevelEditorModule>("LevelEditor");
LevelEditorModule.GetToolBarExtensibilityManager()->AddExtender(TestExtender);

1. Create the extender.

2. Add the toolbar (or menu) extension, defining where it should be placed and the create function.

3. Find the correct module.

4. Add the extender to the Extensibility Manager

Extensibility Managers

Global

Add to all asset editors - ie, Actor Blueprint, Animation Blueprint, Data Asset, etc

FAssetEditorToolkit::GetSharedToolBarExtensibilityManager()->AddExtender(TestExtender);

Level Editor

FLevelEditorModule& LevelEditorModule = FModuleManager::LoadModuleChecked<FLevelEditorModule>("LevelEditor");
LevelEditorModule.GetToolBarExtensibilityManager()->AddExtender(TestExtender);

Persona

FPersonaModule& PersonaModule = FModuleManager::LoadModuleChecked<FPersonaModule>("PersonaModule");
PersonaModule.GetToolBarExtensibilityManager()->AddExtender(TestExtender);

Animation Blueprint

IAnimationEditorModule& AnimationEditorModule = FModuleManager::GetModuleChecked<IAnimationEditorModule>("AnimationEditor");
AnimationEditorModule.GetToolBarExtensibilityManager()->AddExtender(TestExtender);

Actor/Object Blueprints

NOT Animations, Data Assets, etc - ones that have a normal Blueprint Graph

FBlueprintEditorModule& BlueprintEditorModule = FModuleManager::LoadModuleChecked<FBlueprintEditorModule>("Kismet");
BlueprintEditorModule.GetMenuExtensibilityManager()->AddExtender(TestExtender);