MovieSceneBlendingActuator.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "MovieSceneFwd.h"
#include "UObject/ObjectKey.h"
#include "IMovieScenePlayer.h"
#include "Evaluation/Blending/BlendableTokenStack.h"
#include "Evaluation/Blending/MovieSceneInitialValueStore.h"
 
class UObject;
 
template<typename DataType> struct TBlendableTokenStack;
 
struct IMovieSceneBlendingActuator : TSharedFromThis<IMovieSceneBlendingActuator>
{
    virtual ~IMovieSceneBlendingActuator(){}
 
    virtual FMovieSceneAnimTypeID GetDataTypeID() const = 0;
 
    virtual void RemoveInitialValueForObject(FObjectKey InObject) = 0;
};
 
template<typename DataType>
struct TMovieSceneBlendingActuator : IMovieSceneBlendingActuator
{
public:
 
    virtual void Actuate(UObject* InObject, typename TCallTraits<DataType>::ParamType InValue, const TBlendableTokenStack<DataType>& OriginalStack, const FMovieSceneContext& Context, FPersistentEvaluationData& PersistentData, IMovieScenePlayer& Player) = 0;
 
    virtual void Actuate(FMovieSceneInterrogationData& InterrogationData, typename TCallTraits<DataType>::ParamType InValue, const TBlendableTokenStack<DataType>& OriginalStack, const FMovieSceneContext& Context) const {}
 
    virtual DataType RetrieveCurrentValue(UObject* InObject, IMovieScenePlayer* Player) const = 0;
 
    virtual void RemoveInitialValueForObject(FObjectKey ObjectToRemove) override
    {
        InitialValues.RemoveAll([=](const FInitialValue& In) { return In.Object == ObjectToRemove; });
    }
 
    FMovieSceneBlendingActuatorID GetActuatorID() const
    {
        return ActuatorID;
    }
 
    bool HasInitialValue(FObjectKey InObject) const
    {
        for (const auto& InitialValue : InitialValues)
        {
            if (InitialValue.Object == InObject)
            {
                return true;
            }
        }
        return false;
    }
 
protected:
    
    TMovieSceneBlendingActuator(FMovieSceneBlendingActuatorID InActuatorID)
        : ActuatorID(InActuatorID)
    {}
 
private:
 
    virtual FMovieSceneAnimTypeID GetDataTypeID() const final
    {
        return GetBlendingDataType<DataType>();
    }
 
    friend struct TMovieSceneInitialValueStore<DataType>;
 
    struct FInitialValue
    {
        FInitialValue(FObjectKey InObject, const DataType& InValue) : Object(InObject), Value(InValue) {}
 
        FObjectKey Object;
        DataType Value;
    };
 
    TArray<FInitialValue> InitialValues;
 
    FMovieSceneBlendingActuatorID ActuatorID;
};