SWeakWidget.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Layout/Visibility.h"
#include "Widgets/SWidget.h"
#include "Layout/Children.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
 
class FArrangedChildren;
class FPaintArgs;
class FSlateWindowElementList;
 
class SWeakWidget : public SWidget
{
public:
 
    SLATE_BEGIN_ARGS(SWeakWidget)
        {
            _Visibility = EVisibility::SelfHitTestInvisible;
        }
        SLATE_ARGUMENT( TSharedPtr<SWidget>, PossiblyNullContent )
    SLATE_END_ARGS()
 
public:
 
    SLATE_API SWeakWidget();
    SLATE_API virtual ~SWeakWidget();
 
    SLATE_API void Construct(const FArguments& InArgs);
 
    SLATE_API void SetContent(const TSharedRef<SWidget>& InWidget);
 
    SLATE_API bool ChildWidgetIsValid() const;
 
    SLATE_API TWeakPtr<SWidget> GetChildWidget() const;
 
public:
 
    // SWidget interface
    SLATE_API virtual void OnArrangeChildren( const FGeometry& AllottedGeometry, FArrangedChildren& ArrangedChildren ) const override;
    SLATE_API virtual FChildren* GetChildren() override;
    SLATE_API virtual int32 OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const override;
 
protected:
    // Begin SWidget overrides.
    SLATE_API virtual FVector2D ComputeDesiredSize(float) const override;
    // End SWidget overrides.
 
private:
 
    TWeakChild<SWidget> WeakChild;
};