MovieSceneVariantPropertyComponentHandler.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "EntitySystem/MovieScenePropertyComponentHandler.h"
 
 
namespace UE::MovieScene
{
 
 
template<typename PropertyTraits, typename ...CompositeTypes>
struct TVariantPropertyComponentHandler
    : TPropertyComponentHandler<PropertyTraits, CompositeTypes...>
{
    virtual void DispatchInitializePropertyMetaDataTasks(const FPropertyDefinition& Definition, FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents, UMovieSceneEntitySystemLinker* Linker) override
    {
        FBuiltInComponentTypes* BuiltInComponents = FBuiltInComponentTypes::Get();
 
        const PropertyTraits* PropertyTraitsInstance = static_cast<const PropertyTraits*>(Definition.TraitsInstance);
 
        FEntityTaskBuilder()
        .Read(BuiltInComponents->BoundObject)
        .Read(BuiltInComponents->PropertyBinding)
        .Write(BuiltInComponents->VariantPropertyTypeIndex)
        .FilterAll({ BuiltInComponents->Tags.NeedsLink, Definition.PropertyType })
        .Iterate_PerEntity(&Linker->EntityManager, [PropertyTraitsInstance](UObject* Object, const FMovieScenePropertyBinding& Binding, FVariantPropertyTypeIndex& OutMetaData)
        {
            // @todo: this function is garbage slow - needs optimizing to use string views
            FString PropertyPath = Binding.PropertyPath.ToString();
            FProperty* BoundProperty = FTrackInstancePropertyBindings::FindProperty(Object, PropertyPath);
 
            if (ensureMsgf(BoundProperty, TEXT("Unable to find property '%s::%s' on bound object '%s'"), *Object->GetClass()->GetName(), *PropertyPath, *Object->GetName()))
            {
                if (!PropertyTraitsInstance->ComputeVariantIndex(*BoundProperty, OutMetaData))
                {
                    ensureMsgf(false, TEXT("Property '%s::%s' on bound object '%s' is not of a compatible type with %s"), *Object->GetClass()->GetName(), *PropertyPath, *Object->GetName(), GetGeneratedTypeName<PropertyTraits>());
                }
            }
        });
    }
};
 
 
} // namespace UE::MovieScene