UMG Animation

UMG Widget 애니메이션에 대해서 알아 보자.
에디터에서 Widget 애니메이션을 만들줄 안다고 가정한다.

UWidgetAnimation 수집

UWidgetAnimation 애니메이션을 TMap 컨테이너에 추가한다.

void CollectWidgetAnimation(UUserWidget* pWidget, TMap<FString, class UWidgetAnimation*>& FindWidgetAnimation)
{
    if (pWidget == nullptr)
        return;

    //4.22에서는 GetWidgetTreeOwningClass 메소드는 protected 접근자이다.
    //UWidgetBlueprintGeneratedClass* WidgetClass = pWidget->GetWidgetTreeOwningClass();
    //GetWidgetTreeOwningClass와 아래는 같은 값이다.
    UWidgetBlueprintGeneratedClass* WidgetClass = Cast<UWidgetBlueprintGeneratedClass>(pWidget->GetClass());

    FindWidgetAnimation.Empty();

    for (int i = 0; i < WidgetClass->Animations.Num(); i++) {

        FName Name = WidgetClass->Animations[i]->MovieScene->GetFName();
        FindWidgetAnimation.Add(Name.ToString(), WidgetClass->Animations[i]);
    }
}

UWidgetAnimation 애니메이션 실행

여기서는 "MoveWidget"라는 UWidgetAnimation을 실행한다.
PlayAnimation으로 실행 할 수 있다.

    TMap<FString, UWidgetAnimation*> FindWidgetAnimation;
    CollectWidgetAnimation(this, FindWidgetAnimation);

    UWidgetAnimation** ppWidgetAnimation = FindWidgetAnimation.Find(TEXT("MoveWidget"));
    UWidgetAnimation* pWidgetAnimation = nullptr;
    if (ppWidgetAnimation)
        pWidgetAnimation = *ppWidgetAnimation;

    PlayAnimation(pWidgetAnimation, 0.0f, 1, EUMGSequencePlayMode::Forward, 1.0f);

애니메이션이 끝났을때 이벤트 등록

OnSequenceFinishedPlaying에 종료될때 함수를 등록하면 된다.
함수의 시그니쳐는 헤더파일을 참고 한다.

https://answers.unrealengine.com/questions/152632/umg-animation-complete-blueprint-event.html
#if  0
    UUMGSequencePlayer** FoundPlayer = ActiveSequencePlayers.FindByPredicate([&](const UUMGSequencePlayer* Player) { return Player->GetAnimation() == pWidgetAnimation; });
    if(FoundPlayer)
        (*FoundPlayer)->OnSequenceFinishedPlaying().AddUObject(this, &UMainMenu::OnAnimationComplete);
#else
    ActiveSequencePlayers.Last()->OnSequenceFinishedPlaying().AddUObject(this, &UMainMenu::OnAnimationComplete);
#endif

//헤더
void OnAnimationComplete(UUMGSequencePlayer& _player);

//CPP
void UMainMenu::OnAnimationComplete(UUMGSequencePlayer& _player)
{
    UE_LOG(LogTemp, Warning, TEXT("animation finish event"));
}

참고)
https://answers.unrealengine.com/questions/152632/umg-animation-complete-blueprint-event.html