SComplexGradient.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Attribute.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SCompoundWidget.h"
 
class FPaintArgs;
class FSlateWindowElementList;
 
class SComplexGradient
    : public SCompoundWidget
{
public:
 
    SLATE_BEGIN_ARGS(SComplexGradient)
        : _GradientColors()
        , _HasAlphaBackground(false)
        , _Orientation(Orient_Vertical)
    {
        _Visibility = EVisibility::SelfHitTestInvisible;
    }
 
        SLATE_ATTRIBUTE(TArray<FLinearColor>, GradientColors)
 
        
        SLATE_ARGUMENT(bool, HasAlphaBackground)
        
        
        SLATE_ARGUMENT(EOrientation, Orientation)
 
        
        SLATE_ATTRIBUTE(TOptional<FVector2D>, DesiredSizeOverride)
 
    SLATE_END_ARGS()
    
    SLATE_API SComplexGradient();
    SLATE_API virtual ~SComplexGradient();
 
    SLATE_API void Construct( const FArguments& InArgs );
 
protected:
 
    // SCompoundWidget overrides
 
    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;
    SLATE_API virtual FVector2D ComputeDesiredSize(float LayoutScaleMultiplier) const override;
private:
 
    TSlateAttribute<TArray<FLinearColor>, EInvalidateWidgetReason::Paint> GradientColors;
 
    TSlateAttribute<TOptional<FVector2D>, EInvalidateWidgetReason::Layout> DesiredSizeOverride;
 
    bool bHasAlphaBackground;
    
    EOrientation Orientation;
};