UIComponent.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Delegates/IDelegateInstance.h"
#include "FieldNotificationDeclaration.h"
#include "FieldNotificationDelegate.h"
#include "UObject/ObjectMacros.h"
#include "IFieldNotificationClassDescriptor.h"
#include "INotifyFieldValueChanged.h"
 
#include "UIComponent.generated.h"
 
class UEdGraph;
class UWidget;
class SWidget;
 
UCLASS(Abstract, MinimalAPI, CustomFieldNotify)
class UUIComponent : public UObject, public INotifyFieldValueChanged
{
    GENERATED_BODY()
 
public:
    struct FFieldNotificationClassDescriptor : public ::UE::FieldNotification::IClassDescriptor
    {
        UMG_API virtual void ForEachField(const UClass* Class, TFunctionRef<bool(UE::FieldNotification::FFieldId FielId)> Callback) const override;
    };
    UMG_API void Initialize(UWidget* Target);
 
    UMG_API void PreConstruct(bool bIsDesignTime);
    
    UMG_API void Construct();
 
    UMG_API void Destruct();
 
    UMG_API virtual void GraphRenamed(UEdGraph* Graph, const FName& OldName, const FName& NewName);
 
    UMG_API TWeakObjectPtr<UWidget> GetOwner() const;
    
    UMG_API virtual TSharedRef<SWidget> RebuildWidgetWithContent(TSharedRef<SWidget> Content);
 
    //~ Begin INotifyFieldValueChanged Interface
    UMG_API virtual FDelegateHandle AddFieldValueChangedDelegate(UE::FieldNotification::FFieldId InFieldId, FFieldValueChangedDelegate InNewDelegate) override final;
    UMG_API virtual bool RemoveFieldValueChangedDelegate(UE::FieldNotification::FFieldId InFieldId, FDelegateHandle InHandle) override final;
    UMG_API virtual int32 RemoveAllFieldValueChangedDelegates(FDelegateUserObjectConst InUserObject) override final;
    UMG_API virtual int32 RemoveAllFieldValueChangedDelegates(UE::FieldNotification::FFieldId InFieldId, FDelegateUserObjectConst InUserObject) override final;
    UMG_API virtual void BroadcastFieldValueChanged(UE::FieldNotification::FFieldId InFieldId) override final;
    UMG_API virtual const UE::FieldNotification::IClassDescriptor& GetFieldNotificationDescriptor() const override;
    //~ End INotifyFieldValueChanged Interface
 
protected:
    
    UMG_API virtual void OnInitialize();
    UMG_API virtual void OnPreConstruct(bool bIsDesignTime);
    UMG_API virtual void OnConstruct();
    UMG_API virtual void OnDestruct();
    UMG_API virtual void OnGraphRenamed(UEdGraph* Graph, const FName& OldName, const FName& NewName);
 
private:
    UPROPERTY(transient, DuplicateTransient)
    TWeakObjectPtr<UWidget> Owner;
    UE::FieldNotification::FFieldMulticastDelegate Delegates;
 
    bool bInitialized = false;
};