ActiveStateMachineScope.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "AnimNodeMessages.h"
#include "Animation/AnimationAsset.h"
#include "Animation/AnimSync.h"
#include "ActiveStateMachineScope.generated.h"
 
struct FAnimationBaseContext;
struct FAnimInstanceProxy;
struct FAnimNode_StateMachine;
 
USTRUCT()
struct FEncounteredStateMachineStack
{
    GENERATED_BODY()
    FEncounteredStateMachineStack() {} 
    ENGINE_API FEncounteredStateMachineStack(const FEncounteredStateMachineStack& ParentStack, int32 InStateMachineIndex, int32 InStateIndex);
    ENGINE_API FEncounteredStateMachineStack(int32 InStateMachineIndex, int32 InStateIndex);
    struct FStateMachineEntry
    {
        FStateMachineEntry() {}
        FStateMachineEntry(int32 InStateMachineIndex, int32 InStateIndex)
        : StateMachineIndex(InStateMachineIndex)
        , StateIndex(InStateIndex)
        {}
        
        int32 StateMachineIndex = INDEX_NONE;
        int32 StateIndex = INDEX_NONE;;
    };
    TArray<FStateMachineEntry, TInlineAllocator<4, TMemStackAllocator<>>> StateStack;
    static ENGINE_API FEncounteredStateMachineStack InitStack(const FEncounteredStateMachineStack& ParentStack, int32 InStateMachineIndex, int32 InStateIndex);
    static ENGINE_API FEncounteredStateMachineStack InitStack(int32 InStateMachineIndex, int32 InStateIndex);
};
 
namespace UE { namespace Anim {
    
class FAnimNotifyStateMachineContext : public UE::Anim::IAnimNotifyEventContextDataInterface
{
    DECLARE_NOTIFY_CONTEXT_INTERFACE(FAnimNotifyStateMachineContext)
public:
    ENGINE_API FAnimNotifyStateMachineContext(const FEncounteredStateMachineStack& InEncounteredStateMachines);
    ENGINE_API bool IsStateMachineInContext(int32 StateMachineIndex) const;
    ENGINE_API bool IsStateInStateMachineInContext(int32 StateMachineIndex, int32 StateIndex) const; 
    const FEncounteredStateMachineStack EncounteredStateMachines;
};
 
class FActiveStateMachineScope : public UE::Anim::IGraphMessage
{
    DECLARE_ANIMGRAPH_MESSAGE(FActiveStateMachineScope);
public:
    ENGINE_API FActiveStateMachineScope(const FAnimationBaseContext& InContext, FAnimNode_StateMachine* StateMachine, int32 InStateIndex);
 
    static ENGINE_API int32 GetStateMachineIndex(FAnimNode_StateMachine* StateMachine, const FAnimationBaseContext& Context);
    ENGINE_API virtual TUniquePtr<const IAnimNotifyEventContextDataInterface> MakeUniqueEventContextData() const override;
    
    const FEncounteredStateMachineStack ActiveStateMachines; 
};
 
}}  // namespace UE::Anim