SlateWidgetTracker.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
class SWidget;
class ISlateMetaData;
 
enum class ETrackedSlateWidgetOperations : uint8
{
    AddedTrackedWidget,
    RemovedTrackedWidget
};
 
DECLARE_EVENT_ThreeParams(FSlateWidgetTracker, FTrackedWidgetsChangedEvent, const SWidget*, const FName&, ETrackedSlateWidgetOperations)
 
 
class FSlateWidgetTracker
{
 
public:
 
    static SLATECORE_API FSlateWidgetTracker& Get();
 
    SLATECORE_API bool IsEnabled() const;
 
    SLATECORE_API void AddTrackedWidget(const SWidget* WidgetToTrack, const TArray<FName>& Tags);
    SLATECORE_API void AddTrackedWidget(const SWidget* WidgetToTrack, FName Tag);
 
    SLATECORE_API void RemoveTrackedWidget(const SWidget* WidgetToStopTracking);
    
    SLATECORE_API FTrackedWidgetsChangedEvent& OnTrackedWidgetsChanged(const FName& Tag);
 
    template<class Predicate>
    void ForEachTrackedWidget(FName Tag, Predicate Pred)
    {
        if (TArray<const SWidget*>* Widgets = TrackedWidgets.Find(Tag))
        {
            for (const SWidget* Widget : *Widgets)
            {
                Pred(Widget);
            }
        }
    }
 
private:
 
    FSlateWidgetTracker() = default;
    ~FSlateWidgetTracker() = default;
 
    TMap<FName, TArray<const SWidget*>> TrackedWidgets;
    TMap<FName, FTrackedWidgetsChangedEvent> TrackedWidgetsChangedEvents;
 
};