MovieSceneWidgetMaterialSystem.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "EntitySystem/MovieSceneEntitySystem.h"
#include "Evaluation/PreAnimatedState/MovieScenePreAnimatedStateStorage.h"
 
#include "Systems/MovieSceneMaterialSystem.h"
#include "Animation/MovieSceneUMGComponentTypes.h"
 
#include "MovieSceneWidgetMaterialSystem.generated.h"
 
class UWidget;
class UMovieScenePiecewiseDoubleBlenderSystem;
 
namespace UE::MovieScene
{
 
struct FWidgetMaterialKey
{
    FObjectKey Object;
    FWidgetMaterialHandle WidgetMaterialHandle;
 
    friend uint32 GetTypeHash(const FWidgetMaterialKey& In)
    {
        return GetTypeHash(In.Object) ^ GetTypeHash(In.WidgetMaterialHandle);
    }
    friend bool operator==(const FWidgetMaterialKey& A, const FWidgetMaterialKey& B)
    {
        return A.Object == B.Object && A.WidgetMaterialHandle == B.WidgetMaterialHandle;
    }
};
 
struct FWidgetMaterialAccessor
{
    using KeyType = FWidgetMaterialKey;
 
    UWidget* Widget;
    FWidgetMaterialHandle WidgetMaterialHandle;
 
    FWidgetMaterialAccessor(const FWidgetMaterialKey& InKey);
    FWidgetMaterialAccessor(UObject* InObject, FWidgetMaterialHandle InWidgetMaterialHandle);
 
    explicit operator bool() const;
 
    UMaterialInterface* GetMaterial() const;
    void SetMaterial(UMaterialInterface* InMaterial);
    UMaterialInstanceDynamic* CreateDynamicMaterial(UMaterialInterface* InMaterial);
    FString ToString() const;
};
 
using FPreAnimatedWidgetMaterialTraits          = TPreAnimatedMaterialTraits<FWidgetMaterialAccessor, UObject*, FWidgetMaterialHandle>;
using FPreAnimatedWidgetMaterialParameterTraits = TPreAnimatedMaterialParameterTraits<FWidgetMaterialAccessor, UObject*, FWidgetMaterialHandle>;
 
struct FPreAnimatedWidgetMaterialSwitcherStorage
    : public TPreAnimatedStateStorage<TPreAnimatedMaterialTraits<FWidgetMaterialAccessor, UObject*, FWidgetMaterialHandle>>
{
    static TAutoRegisterPreAnimatedStorageID<FPreAnimatedWidgetMaterialSwitcherStorage> StorageID;
};
 
struct FPreAnimatedWidgetMaterialParameterStorage
    : public TPreAnimatedStateStorage<TPreAnimatedMaterialParameterTraits<FWidgetMaterialAccessor, UObject*, FWidgetMaterialHandle>>
{
    static TAutoRegisterPreAnimatedStorageID<FPreAnimatedWidgetMaterialParameterStorage> StorageID;
};
 
} // namespace UE::MovieScene
 
 
UCLASS(MinimalAPI)
class UMovieSceneWidgetMaterialSystem
    : public UMovieSceneEntitySystem
    , public IMovieScenePreAnimatedStateSystemInterface
{
public:
 
    GENERATED_BODY()
 
    UMovieSceneWidgetMaterialSystem(const FObjectInitializer& ObjInit);
 
private:
 
    virtual void OnLink() override;
    virtual void OnUnlink() override;
    virtual void OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents) override;
 
    virtual void SavePreAnimatedState(const FPreAnimationParameters& InParameters) override;
 
private:
 
    UE::MovieScene::TMovieSceneMaterialSystem<UE::MovieScene::FWidgetMaterialAccessor, UObject*, FWidgetMaterialHandle> SystemImpl;
};