UE4 Asset Editor Layout

1 Register Layout

Create a layout in your application mode class and it will be applied while Calling SetCurrentMode(ModeName) in editor class

FTestEditorApplicationMode::FTestEditorApplicationMode(TSharedPtr<class FTestEditor> InTestEditor)
	: FApplicationMode(FTestEditor::CustomTestMode, FTestEditor::GetLocalizedMode)
{
	TestEditor = InTestEditor;

	TestEditorTabFactories.RegisterFactory(MakeShareable(new FTestDetailsSummoner(InTestEditor)));
	TestEditorTabFactories.RegisterFactory(MakeShareable(new FTestSearchSummoner(InTestEditor)));

	TabLayout = FTabManager::NewLayout( "Standalone_TestEditor_Layout_v1" )
	->AddArea
	(
		FTabManager::NewPrimaryArea() ->SetOrientation(Orient_Vertical)
		->Split
		(
			FTabManager::NewStack()
			->SetSizeCoefficient(0.1f)
			->AddTab(InTestEditor->GetToolbarTabId(), ETabState::OpenedTab)
			->SetHideTabWell(true) 
		)
		->Split
		(
			FTabManager::NewSplitter() ->SetOrientation(Orient_Horizontal)
			->Split
			(
				FTabManager::NewStack()
				->SetSizeCoefficient(0.7f)
				->AddTab(FTestEditorTabs::GraphEditorID, ETabState::ClosedTab)
			)
			->Split
			(
				FTabManager::NewSplitter() ->SetOrientation(Orient_Vertical)
				->SetSizeCoefficient(0.3f)
				->Split
				(
					FTabManager::NewStack()
					->AddTab(FTestEditorTabs::GraphDetailsID, ETabState::OpenedTab)
					->AddTab(FTestEditorTabs::SearchID, ETabState::ClosedTab)
				)

			)
		)
	);
	
}

Each tab is identified by an unique name, such as FTestEditorTabs::GraphEditorID above.

Actually, RestoreFromLayout is called in the SetCurrentMode, also you can call it directly by yourself.

void FWorkflowCentricApplication::SetCurrentMode(FName NewMode)
{
	...
	// Activate the new layout
	const TSharedRef<FTabManager::FLayout> NewLayout = CurrentAppModePtr->ActivateMode(TabManager);
	RestoreFromLayout(NewLayout);
	...
}

If there exists a layout in config file, it will load the existing one. If you want to clean it, you should remove config file in the Engine Saved folder.

TSharedRef<FTabManager::FLayout> FApplicationMode::ActivateMode(TSharedPtr<FTabManager> InTabManager)
{
	check(InTabManager.IsValid());
	RegisterTabFactories(InTabManager);
	// Try loading the layout from INI
	check(TabLayout.IsValid());
	return FLayoutSaveRestore::LoadFromConfig(GEditorLayoutIni, TabLayout.ToSharedRef());
}

LayoutConfig

1 Register Layout

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