// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "ConnectionDrawingPolicy.h"
#include "EdGraph/EdGraphSchema.h"
#include "DialogueGraphSchema.generated.h"

struct FConnectionParams;
/**
 * 创建节点的Action
 */
USTRUCT()
struct FDialogueGraphSchemaAction_NewNode : public FEdGraphSchemaAction
{
	GENERATED_BODY()

public:
	FDialogueGraphSchemaAction_NewNode() : FEdGraphSchemaAction() {}

	FDialogueGraphSchemaAction_NewNode(UClass* InClassTemplate, FText InNodeCategory, FText InMenuDesc, FText InToolTip)
		: FEdGraphSchemaAction(InNodeCategory, InMenuDesc, InToolTip, 0), ClassTemplate(InClassTemplate) {}

	virtual UEdGraphNode* PerformAction(UEdGraph* ParentGraph, UEdGraphPin* FromPin, const FVector2D Location, bool bSelectNewNode = true) override;

protected:
	UClass* ClassTemplate = nullptr;
};

//自定义连线绘制方式
class FVerticalConnectionDrawingPolicy : public FConnectionDrawingPolicy
{
public:
	FVerticalConnectionDrawingPolicy(int32 InBackLayerID, int32 InFrontLayerID, float InZoomFactor, const FSlateRect& InClippingRect, FSlateWindowElementList& InDrawElements);
	virtual void DrawSplineWithArrow(const FVector2D& StartPoint, const FVector2D& EndPoint, const FConnectionParams& Params) override;
	virtual void DrawSplineWithArrow(const FGeometry& StartGeom, const FGeometry& EndGeom, const FConnectionParams& Params) override;
	//virtual void DrawConnection(int32 LayerId, const FVector2D& Start, const FVector2D& End, const FConnectionParams& Params) override;
	virtual FVector2D ComputeSplineTangent(const FVector2D& Start, const FVector2D& End) const override;
	//virtual FVector2D  GetCorrectedPinPosition(const FVector2D& OriginalPosition, UEdGraphPin* Pin, EEdGraphPinDirection Direction);
	virtual FVector2D GetPinPos(const UEdGraphPin* Pin) const;
};
/**
 * 对话图表规则
 */
UCLASS()
class DIALOGUEEDITOR_API UDialogueGraphSchema : public UEdGraphSchema
{
	GENERATED_BODY()

public:
	/** UEdGraphSchema */
	virtual void CreateDefaultNodesForGraph(UEdGraph& Graph) const override;
	// 右键菜单创建节点
	virtual void GetGraphContextActions(FGraphContextMenuBuilder& ContextMenuBuilder) const override;

	// 连接规则
	virtual const FPinConnectionResponse CanCreateConnection(const UEdGraphPin* A, const UEdGraphPin* B) const override;
	//修改连线的绘制方式
	virtual FConnectionDrawingPolicy* CreateConnectionDrawingPolicy(int32 InBackLayerID, int32 InFrontLayerID, float InZoomFactor, const FSlateRect& InClippingRect, FSlateWindowElementList& InDrawElements, class UEdGraph* InGraphObj) const override;
};