UnrealEngineUWP/Engine/Plugins/Experimental/MeshModelingToolset/Source/ModelingComponents/Private/BaseTools/SingleSelectionMeshEditingTool.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include "BaseTools/SingleSelectionMeshEditingTool.h"

#include "TargetInterfaces/MaterialProvider.h"
#include "TargetInterfaces/MeshDescriptionCommitter.h"
#include "TargetInterfaces/MeshDescriptionProvider.h"
#include "TargetInterfaces/PrimitiveComponentBackedTarget.h"
#include "ToolTargetManager.h"

/*
 * ToolBuilder
 */
const FToolTargetTypeRequirements& USingleSelectionMeshEditingToolBuilder::GetTargetRequirements() const
{
	static FToolTargetTypeRequirements TypeRequirements({
		UMaterialProvider::StaticClass(),
		UMeshDescriptionCommitter::StaticClass(),
		UMeshDescriptionProvider::StaticClass(),
		UPrimitiveComponentBackedTarget::StaticClass()
		});
	return TypeRequirements;
}

bool USingleSelectionMeshEditingToolBuilder::CanBuildTool(const FToolBuilderState& SceneState) const
{
	return SceneState.TargetManager->CountSelectedAndTargetable(SceneState, GetTargetRequirements()) == 1;
}

UInteractiveTool* USingleSelectionMeshEditingToolBuilder::BuildTool(const FToolBuilderState& SceneState) const
{
	USingleSelectionMeshEditingTool* NewTool = CreateNewTool(SceneState);
	InitializeNewTool(NewTool, SceneState);
	return NewTool;
}

void USingleSelectionMeshEditingToolBuilder::InitializeNewTool(USingleSelectionMeshEditingTool* NewTool, const FToolBuilderState& SceneState) const
{
	UToolTarget* Target = SceneState.TargetManager->BuildFirstSelectedTargetable(SceneState, GetTargetRequirements());
	check(Target);
	NewTool->SetTarget(Target);
	NewTool->SetWorld(SceneState.World);

	if (WantsInputSelectionIfAvailable() && SceneState.StoredToolSelection != nullptr)
	{
		NewTool->SetInputSelection(SceneState.StoredToolSelection);
	}
}