DataflowVariableNodes.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once 
 
#include "Dataflow/DataflowNode.h"
 
#include "DataflowVariableNodes.generated.h"
 
class UDataflow;
class UObject;
struct FInstancedPropertyBag;
struct FPropertyChangedEvent;
 
USTRUCT()
struct FGetDataflowVariableNode : public FDataflowNode
{
    GENERATED_USTRUCT_BODY()
    DATAFLOW_NODE_DEFINE_INTERNAL(FGetDataflowVariableNode, "GetVariable", "Dataflow", "")
 
public:
    DATAFLOWENGINE_API FGetDataflowVariableNode(const UE::Dataflow::FNodeParameters& InParam, FGuid InGuid = FGuid::NewGuid());
    DATAFLOWENGINE_API ~FGetDataflowVariableNode();
 
    DATAFLOWENGINE_API void SetVariable(UDataflow* DataflowAsset, FName VariableName);
    DATAFLOWENGINE_API bool TryAddVariableToDataflowAsset(UDataflow& DataflowAsset);
 
    FName GetVariableName() const { return VariableName; }
 
private:
    UPROPERTY(meta=(DataflowOutput))
    FDataflowAnyType Value;
 
    // Called when UPROPERTY members of the dataflow node have been changed in the editor
    virtual void OnPropertyChanged(UE::Dataflow::FContext& Context, const FPropertyChangedEvent& InPropertyChangedEvent) override;
 
    virtual void PostSerialize(const FArchive& Ar);
 
    virtual void Evaluate(UE::Dataflow::FContext& Context, const FDataflowOutput* Out) const;
 
    static void EvaluateBool(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateByte(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateInt32(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateInt64(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateFloat(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateDouble(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateName(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateString(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateText(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateObject(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
    static void EvaluateStruct(const FGetDataflowVariableNode& Node, const FInstancedPropertyBag& Variables, UE::Dataflow::FContext& Context, const FDataflowOutput& Out);
 
    void UpdateOutputTypes(const FPropertyBagPropertyDesc& Desc);
    void ChangeOutputType(FDataflowOutput* Output, FName NewType);
 
private:
    UPROPERTY(EditAnywhere, Category = "Default Value", meta = (FixedLayout, ShowOnlyInnerProperties))
    FInstancedPropertyBag VariablePropertyBag;
 
    UPROPERTY(VisibleAnywhere, Category = Variable )
    FName VariableName;
 
    void RegisterHandlers();
    void UnregisterHandlers();
 
    using FStaticEvaluationFunctionPtr = void(*)(const FGetDataflowVariableNode&, const FInstancedPropertyBag&, UE::Dataflow::FContext&, const FDataflowOutput&);
    FStaticEvaluationFunctionPtr EvaluateFunction = nullptr;
 
    EPropertyBagContainerType ContainerType = EPropertyBagContainerType::None;
 
    void OnObjectPropertyChanged(UObject* InObject, FPropertyChangedEvent& InPropertyChangedEvent);
 
    TWeakObjectPtr<UDataflow> WeakDataflowPtr;
 
};
 
namespace UE::Dataflow
{
    void RegisterVariableNodes();
}