WidgetFieldNotificationExtension.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Components/Visual.h"
#include "Extensions/UserWidgetExtension.h"
#include "FieldNotificationDelegate.h"
 
#include "WidgetFieldNotificationExtension.generated.h"
 
class UVisual;
 
UCLASS(MinimalAPI, Transient, NotBlueprintType)
class UWidgetFieldNotificationExtension : public UUserWidgetExtension
{
    GENERATED_BODY()
 
public:
    using FDelegate = UE::FieldNotification::FFieldMulticastDelegate::FDelegate;
    using FFieldId = UE::FieldNotification::FFieldId;
    using FRemoveFromResult = UE::FieldNotification::FFieldMulticastDelegate::FRemoveFromResult;
    using FRemoveAllResult = UE::FieldNotification::FFieldMulticastDelegate::FRemoveAllResult;
 
public:
    FDelegateHandle AddFieldValueChangedDelegate(const UVisual* InObject, FFieldId InFieldId, FDelegate InNewDelegate)
    {
        return Delegates.Add(InObject, InFieldId, MoveTemp(InNewDelegate));
    }
 
    FDelegateHandle AddFieldValueChangedDelegate(const UVisual* InObject, FFieldId InFieldId, const FFieldValueChangedDynamicDelegate& InDelegate)
    {
        return Delegates.Add(InObject, InFieldId, InDelegate);
    }
 
    FRemoveFromResult RemoveFieldValueChangedDelegate(const UVisual* InObject, FFieldId InFieldId, FDelegateHandle InDelegateHandle)
    {
        return Delegates.RemoveFrom(InObject, InFieldId, InDelegateHandle);
    }
 
    FRemoveFromResult RemoveFieldValueChangedDelegate(const UVisual* InObject, FFieldId InFieldId, const FFieldValueChangedDynamicDelegate& InDelegate)
    {
        return Delegates.RemoveFrom(InObject, InFieldId, InDelegate);
    }
 
    FRemoveAllResult RemoveAllFieldValueChangedDelegates(const UVisual* InObject, FDelegateUserObjectConst InUserObject)
    {
        return Delegates.RemoveAll(InObject, InUserObject);
    }
 
    FRemoveAllResult RemoveAllFieldValueChangedDelegates(const UVisual* InObject, FFieldId InFieldId, FDelegateUserObjectConst InUserObject)
    {
        return Delegates.RemoveAll(InObject, InFieldId, InUserObject);
    }
 
    void BroadcastFieldValueChanged(UVisual* InObject, UE::FieldNotification::FFieldId InFieldId)
    {
        Delegates.Broadcast(InObject, InFieldId);
    }
 
private:
    UE::FieldNotification::FFieldMulticastDelegate Delegates;
};