SDPIScaler.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/SWidget.h"
#include "Layout/Children.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SPanel.h"
 
class FArrangedChildren;
 
class SDPIScaler : public SPanel
{
    SLATE_DECLARE_WIDGET_API(SDPIScaler, SPanel, SLATE_API)
 
public:
    SLATE_BEGIN_ARGS( SDPIScaler )
        : _DPIScale( 1.0f )
        , _Content()
        {
            _Visibility = EVisibility::SelfHitTestInvisible;
        }
 
        SLATE_ATTRIBUTE( float, DPIScale )
 
        
        SLATE_DEFAULT_SLOT( FArguments, Content )
 
    SLATE_END_ARGS()
 
    SLATE_API SDPIScaler();
    SLATE_API virtual ~SDPIScaler();
 
    SLATE_API void Construct( const FArguments& InArgs );
 
    SLATE_API virtual void OnArrangeChildren( const FGeometry& AllottedGeometry, FArrangedChildren& ArrangedChildren ) const override;
    
    SLATE_API virtual FVector2D ComputeDesiredSize(float) const override;
 
    SLATE_API virtual FChildren* GetChildren() override;
 
    SLATE_API void SetContent(TSharedRef<SWidget> InContent);
 
    SLATE_API void SetDPIScale(TAttribute<float> InDPIScale);
 
protected:
 
    SLATE_API virtual float GetRelativeLayoutScale(int32 ChildIndex, float LayoutScaleMultiplier) const override;
 
    TSlateAttributeRef<float> GetDPIScaleAttribute() const { return TSlateAttributeRef<float>(SharedThis(this), DPIScaleAttribute); }
 
    struct FDPIScalerOneChildSlot : ::TSingleWidgetChildrenWithBasicLayoutSlot<EInvalidateWidgetReason::None> // we want to add it to the Attribute descriptor
    {
        friend SDPIScaler;
        using ::TSingleWidgetChildrenWithBasicLayoutSlot<EInvalidateWidgetReason::None>::TSingleWidgetChildrenWithBasicLayoutSlot;
    };
 
    FDPIScalerOneChildSlot ChildSlot;
 
private:
    TSlateAttribute<float> DPIScaleAttribute;
};