MovieSceneInitialValueStore.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "IMovieScenePlayer.h"
#include "MovieSceneExecutionToken.h"
#include "MovieSceneFwd.h"
#include "Templates/SharedPointer.h"
#include "UObject/ObjectKey.h"
 
class IMovieScenePlayer;
class UObject;
struct IMovieSceneBlendingActuator;
template<typename DataType> struct TBlendableTokenStack;
template<typename DataType> struct TMovieSceneBlendingActuator;
 
struct FMovieSceneRemoveInitialValueTokenProducer : IMovieScenePreAnimatedTokenProducer
{
    MOVIESCENE_API FMovieSceneRemoveInitialValueTokenProducer(TWeakPtr<IMovieSceneBlendingActuator> InWeakActuator);
    MOVIESCENE_API ~FMovieSceneRemoveInitialValueTokenProducer();
 
    MOVIESCENE_API virtual IMovieScenePreAnimatedTokenPtr CacheExistingState(UObject& InObject) const override;
 
private:
    TWeakPtr<IMovieSceneBlendingActuator> WeakActuator;
};
 
struct FMovieSceneRemoveInitialGlobalValueTokenProducer : IMovieScenePreAnimatedGlobalTokenProducer
{
    MOVIESCENE_API FMovieSceneRemoveInitialGlobalValueTokenProducer(TWeakPtr<IMovieSceneBlendingActuator> InWeakActuator);
    MOVIESCENE_API ~FMovieSceneRemoveInitialGlobalValueTokenProducer();
 
    MOVIESCENE_API virtual IMovieScenePreAnimatedGlobalTokenPtr CacheExistingState() const override;
 
private:
    TWeakPtr<IMovieSceneBlendingActuator> WeakActuator;
};
 
template<typename DataType>
struct TMovieSceneInitialValueStore
{
    TMovieSceneInitialValueStore(TMovieSceneBlendingActuator<DataType>& InActuator, const TBlendableTokenStack<DataType>& InStack, UObject* InAnimatingObject, IMovieScenePlayer* InPlayer)
        : Actuator(InActuator)
        , Stack(InStack)
        , AnimatingObject(InAnimatingObject)
        , Player(InPlayer)
    {}
 
    DataType RetrieveCurrentValue() const
    {
        return Actuator.RetrieveCurrentValue(AnimatingObject, Player);
    }
 
    DataType GetInitialValue() const
    {
        FObjectKey ThisObjectKey(AnimatingObject);
        for (const auto& InitialValue : Actuator.InitialValues)
        {
            if (InitialValue.Object == ThisObjectKey)
            {
                return InitialValue.Value;
            }
        }
 
        DataType NewInitialValue = Actuator.RetrieveCurrentValue(AnimatingObject, Player);
        if (Player)
        {
            Actuator.InitialValues.Emplace(ThisObjectKey, NewInitialValue);
        }
 
        return NewInitialValue;
    }
 
    UObject* GetAnimatingObject() const
    {
        return AnimatingObject;
    }
 
private:
    TMovieSceneBlendingActuator<DataType>& Actuator;
    const TBlendableTokenStack<DataType>& Stack;
    UObject* AnimatingObject;
    IMovieScenePlayer* Player;
};