DataflowDynamicConnections.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Dataflow/DataflowAnyType.h"
#include "Dataflow/DataflowConnection.h"
 
#include "StructUtils/PropertyBag.h"
 
#include "DataflowDynamicConnections.generated.h"
 
struct FDataflowNode;
 
/*
* Dynamic connection object allow a node to add dynamic inputs or outputs backed by a strongly typed properties via a property bag 
*/
USTRUCT()
struct FDataflowDynamicConnections
{
    GENERATED_USTRUCT_BODY()
 
    struct IOwnerInterface
    {
        virtual FDataflowNode* GetOwner(const FDataflowDynamicConnections* Caller) = 0;
        virtual const FInstancedPropertyBag& GetPropertyBag(const FDataflowDynamicConnections* Caller) = 0;
    };
 
public:
    DATAFLOWENGINE_API FDataflowDynamicConnections();
    DATAFLOWENGINE_API FDataflowDynamicConnections(UE::Dataflow::FPin::EDirection PInDirection, IOwnerInterface* OwnerInterface, UDataflow* DataflowAsset);
 
    DATAFLOWENGINE_API void Refresh();
 
private:
    using FConnectionReference = UE::Dataflow::TConnectionReference<FDataflowAllTypes>;
    FConnectionReference GetConnectionReference(int32 Index) const;
 
    bool IsSupportedType(const FPropertyBagPropertyDesc& PropertyDesc);
    FDataflowConnection* CreateConnection(FConnectionReference Connectionreference);
    TArray<FDataflowConnection*> GetDynamicConnections() const;
    void ClearDynamicConnections();
 
    bool SetConnectionTypeFromPropertyDesc(FDataflowConnection& Connection, const FPropertyBagPropertyDesc& PropertyDesc);
    FName GetCppTypeFromPropertyDesc(const FPropertyBagPropertyDesc& PropertyDesc);
    FDataflowConnection* AddNewConnectionFromPropertyDesc(const FPropertyBagPropertyDesc& PropertyDesc);
 
private:
    UPROPERTY()
    TArray<FDataflowAllTypes> DynamicProperties;
 
    TMap<FName, FGuid> ConnectionNameToPropertyId;
 
    UE::Dataflow::FPin::EDirection PinDirection = UE::Dataflow::FPin::EDirection::NONE;
    IOwnerInterface* OwnerInterface;
    TWeakObjectPtr<UDataflow> DataflowAssetWeakPtr;
};