SSpacer.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Attribute.h"
#include "Layout/Visibility.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SLeafWidget.h"
 
class FPaintArgs;
class FSlateWindowElementList;
 
template <>
struct TWidgetTypeTraits<class SSpacer>
{
    static constexpr bool SupportsInvalidation() { return true; }
};
 
class SSpacer : public SLeafWidget
{
    SLATE_DECLARE_WIDGET_API(SSpacer, SLeafWidget, SLATE_API)
 
public:
 
    SLATE_BEGIN_ARGS( SSpacer )
        : _Size(FVector2D::ZeroVector)
        {
            _Visibility = EVisibility::SelfHitTestInvisible;
        }
 
        SLATE_ATTRIBUTE( FVector2D, Size )
    SLATE_END_ARGS()
 
    SLATE_API SSpacer();
 
    SLATE_API void Construct( const FArguments& InArgs );
 
    // SWidget interface
    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;
    // End of SWidget interface
 
    FVector2D GetSize() const
    {
        if (bIsSpacerSizeBound)
        {
            SSpacer& MutableSelf = const_cast<SSpacer&>(*this);
            MutableSelf.SpacerSize.UpdateNow(MutableSelf);
        }
        return SpacerSize.Get();
    }
 
    void SetSize( TAttribute<FVector2D> InSpacerSize )
    {
        bIsSpacerSizeBound = InSpacerSize.IsBound();
        SpacerSize.Assign(*this, InSpacerSize);
    }
 
protected:
    //~ Begin SWidget overrides.
    SLATE_API virtual FVector2D ComputeDesiredSize(float) const override;
    //~ End SWidget overrides.
 
private:
    TSlateAttribute<FVector2D> SpacerSize;
    bool bIsSpacerSizeBound;
};