UnrealEngineUWP/Engine/Source/Editor/GraphEditor/Private/StateMachineConnectionDrawingPolicy.h

// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.

#pragma once

#include "ConnectionDrawingPolicy.h"

/////////////////////////////////////////////////////
// FStateMachineConnectionDrawingPolicy

// This class draws the connections for an UEdGraph with a state machine schema
class FStateMachineConnectionDrawingPolicy : public FConnectionDrawingPolicy
{
protected:
	UEdGraph* GraphObj;

	TMap<UEdGraphNode*, int32> NodeWidgetMap;
public:
	//
	FStateMachineConnectionDrawingPolicy(int32 InBackLayerID, int32 InFrontLayerID, float ZoomFactor, const FSlateRect& InClippingRect, FSlateWindowElementList& InDrawElements, UEdGraph* InGraphObj);

	// FConnectionDrawingPolicy interface
	virtual void DetermineWiringStyle(UEdGraphPin* OutputPin, UEdGraphPin* InputPin, /*inout*/ FConnectionParams& Params) override;
	virtual void Draw(TMap<TSharedRef<SWidget>, FArrangedWidget>& PinGeometries, FArrangedChildren& ArrangedNodes) override;
	virtual void DetermineLinkGeometry(
		FArrangedChildren& ArrangedNodes, 
		TSharedRef<SWidget>& OutputPinWidget,
		UEdGraphPin* OutputPin,
		UEdGraphPin* InputPin,
		/*out*/ FArrangedWidget*& StartWidgetGeometry,
		/*out*/ FArrangedWidget*& EndWidgetGeometry
		) override;
	virtual void DrawSplineWithArrow(const FGeometry& StartGeom, const FGeometry& EndGeom, const FConnectionParams& Params) override;
	virtual void DrawSplineWithArrow(const FVector2D& StartPoint, const FVector2D& EndPoint, const FConnectionParams& Params) override;
	virtual void DrawPreviewConnector(const FGeometry& PinGeometry, const FVector2D& StartPoint, const FVector2D& EndPoint, UEdGraphPin* Pin) override;
	virtual FVector2D ComputeSplineTangent(const FVector2D& Start, const FVector2D& End) const override;
	// End of FConnectionDrawingPolicy interface

protected:
	void Internal_DrawLineWithArrow(const FVector2D& StartAnchorPoint, const FVector2D& EndAnchorPoint, const FConnectionParams& Params);
};