MovieSceneKeyProxy.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "UObject/ObjectMacros.h"
#include "UObject/Interface.h"
#include "MovieSceneSection.h"
#include "Channels/MovieSceneChannelHandle.h"
#include "Channels/MovieSceneChannel.h"
#include "Curves/KeyHandle.h"
#include "GenericPlatform/GenericPlatformMath.h"
#include "MovieSceneKeyProxy.generated.h"
 
UINTERFACE(MinimalAPI)
class UMovieSceneKeyProxy : public UInterface
{
    GENERATED_BODY()
};
 
 
class IMovieSceneKeyProxy
{
public:
 
    GENERATED_BODY()
 
    
    virtual void UpdateValuesFromRawData() = 0;
 
protected:
 
    template<typename ChannelType, typename ValueType>
    void OnProxyValueChanged(TMovieSceneChannelHandle<ChannelType> InChannelHandle, UMovieSceneSignedObject* InSignedObject, FKeyHandle InKeyHandle, ValueType& InOutValue, FFrameNumber& InOutTime);
 
    template<typename ChannelType, typename ValueType>
    void RefreshCurrentValue(TMovieSceneChannelHandle<ChannelType> InChannelHandle, FKeyHandle InKeyHandle, ValueType& OutValue, FFrameNumber& OutTime);
};
 
 
 
template<typename ChannelType, typename ValueType>
void IMovieSceneKeyProxy::OnProxyValueChanged(TMovieSceneChannelHandle<ChannelType> InChannelHandle, UMovieSceneSignedObject* InSignedObject, FKeyHandle InKeyHandle, ValueType& InOutValue, FFrameNumber& InOutTime)
{
    auto* Channel = InChannelHandle.Get();
    if (!Channel || !InSignedObject)
    {
        return;
    }
 
    UMovieSceneSection* Section = Cast<UMovieSceneSection>(InSignedObject);
    if (!Section)
    {
        Section = InSignedObject->GetTypedOuter<UMovieSceneSection>();
    }
 
    auto ChannelData = Channel->GetData();
 
    int32 KeyIndex = ChannelData.GetIndex(InKeyHandle);
    if (KeyIndex != INDEX_NONE)
    {
        // If we have no signed object, or it's locked, don't let the user change the value
        if (!InSignedObject || (Section && !Section->TryModify()))
        {
            InOutTime  = ChannelData.GetTimes()[KeyIndex];
            InOutValue = ChannelData.GetValues()[KeyIndex];
        }
        else
        {
            InSignedObject->Modify();
 
            ChannelData.GetValues()[KeyIndex] = InOutValue;
 
            ChannelData.MoveKey(KeyIndex, InOutTime);
 
            if (Section)
            {
                Section->ExpandToFrame(InOutTime);
            }
        }
        Channel->PostEditChange();
    }
}
 
 
 
template<typename ChannelType, typename ValueType>
void IMovieSceneKeyProxy::RefreshCurrentValue(TMovieSceneChannelHandle<ChannelType> InChannelHandle, FKeyHandle InKeyHandle, ValueType& OutValue, FFrameNumber& OutTime)
{
    auto* Channel = InChannelHandle.Get();
    if (Channel)
    {
        auto ChannelData = Channel->GetData();
        int32 KeyIndex = ChannelData.GetIndex(InKeyHandle);
        if (KeyIndex != INDEX_NONE && KeyIndex < FMath::Min(ChannelData.GetValues().Num(), ChannelData.GetTimes().Num()))
        {
            OutValue = ChannelData.GetValues()[KeyIndex];
            OutTime  = ChannelData.GetTimes()[KeyIndex];
        }
    }
}