MovieSceneComponentAttachmentSystem.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "EntitySystem/MovieSceneEntityInstantiatorSystem.h"
#include "MovieSceneTracksComponentTypes.h"
#include "EntitySystem/MovieScenePreAnimatedStateSystem.h"
#include "EntitySystem/MovieSceneOverlappingEntityTracker.h"
 
#include "MovieSceneComponentAttachmentSystem.generated.h"
 
struct FMovieSceneAnimTypeID;
 
class USceneComponent;
class UMovieScenePreAnimatedComponentTransformSystem;
 
namespace UE
{
namespace MovieScene
{
 
struct FPreAnimAttachment
{
    TWeakObjectPtr<USceneComponent> OldAttachParent;
    FName OldAttachSocket;
    UE::MovieScene::FComponentDetachParams DetachParams;
};
 
} // namespace MovieScene
} // namespace UE
 
 
UCLASS(MinimalAPI)
class UMovieSceneComponentAttachmentInvalidatorSystem
    : public UMovieSceneEntityInstantiatorSystem
{
public:
 
    GENERATED_BODY()
 
    UMovieSceneComponentAttachmentInvalidatorSystem(const FObjectInitializer& ObjInit);
 
private:
 
    virtual void OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents) override final;
};
 
UCLASS(MinimalAPI)
class UMovieSceneComponentAttachmentSystem
    : public UMovieSceneEntityInstantiatorSystem
    , public IMovieScenePreAnimatedStateSystemInterface
{
public:
 
    GENERATED_BODY()
 
    UMovieSceneComponentAttachmentSystem(const FObjectInitializer& ObjInit);
 
    void AddPendingDetach(USceneComponent* SceneComponent, const UE::MovieScene::FPreAnimAttachment& Attachment);
 
private:
 
    virtual void OnLink() override final;
    virtual void OnUnlink() override final;
    virtual void OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents) override final;
 
    //~ IMovieScenePreAnimatedStateSystemInterface interface
    virtual void SavePreAnimatedState(const FPreAnimationParameters& InParameters) override;
    virtual void RestorePreAnimatedState(const FPreAnimationParameters& InParameters) override;
 
    UE::MovieScene::TOverlappingEntityTracker<UE::MovieScene::FPreAnimAttachment, FObjectKey> AttachmentTracker;
 
    TArray<TTuple<USceneComponent*, UE::MovieScene::FPreAnimAttachment>> PendingAttachmentsToRestore;
};