MovieSceneEntityFactoryTypes.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Array.h"
#include "Containers/ArrayView.h"
 
#include "EntitySystem/MovieSceneEntityIDs.h"
#include "EntitySystem/MovieSceneEntitySystemTypes.h"
 
class UMovieSceneEntitySystemLinker;
 
 
namespace UE
{
namespace MovieScene
{
 
struct FEntityRange;
 
struct FChildEntityFactory
{
    virtual ~FChildEntityFactory(){}
 
    int32 Num() const;
 
    int32 GetCurrentIndex() const;
 
    void Apply(UMovieSceneEntitySystemLinker* Linker, FEntityAllocationProxy ParentAllocationProxy);
    
    void Add(int32 EntityIndex)
    {
        ParentEntityOffsets.Add(EntityIndex);
    }
 
    virtual void GenerateDerivedType(FComponentMask& OutNewEntityType)
    {}
 
    virtual void PostInitialize(UMovieSceneEntitySystemLinker* Linker)
    {}
 
    virtual void InitializeAllocation(UMovieSceneEntitySystemLinker* Linker, const FComponentMask& ParentType, const FComponentMask& ChildType, const FEntityAllocation* ParentAllocation, TArrayView<const int32> ParentAllocationOffsets, const FEntityRange& InChildEntityRange)
    {}
 
protected:
    TArrayView<const int32> CurrentEntityOffsets;
    TArray<int32> ParentEntityOffsets;
};
 
 
 
struct FChildEntityInitializer
{
    virtual ~FChildEntityInitializer(){}
 
    virtual bool IsRelevant(const FComponentMask& InParentType, const FComponentMask& InChildType) const
    {
        // Entity initializers with no parent component are always valid
        const bool bHasParentComponent = !ParentComponent || InParentType.Contains(ParentComponent);
        const bool bHasChildComponent  =  ChildComponent  && InChildType.Contains(ChildComponent);
 
        return bHasParentComponent && bHasChildComponent;
    }
 
    FComponentTypeID GetParentComponent() const
    {
        return ParentComponent;
    }
 
    FComponentTypeID GetChildComponent() const
    {
        return ChildComponent;
    }
 
    virtual void Run(const FEntityRange&, const FEntityAllocation*, TArrayView<const int32>) = 0;
 
protected:
 
    FComponentTypeID ParentComponent, ChildComponent;
 
    explicit FChildEntityInitializer(FComponentTypeID InParentComponent, FComponentTypeID InChildComponent)
        : ParentComponent(InParentComponent)
        , ChildComponent(InChildComponent)
    {}
};
 
 
 
}   // using namespace MovieScene
}   // using namespace UE