SExpanderArrow.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Attribute.h"
#include "Input/Reply.h"
#include "Layout/Visibility.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Layout/Margin.h"
#include "Widgets/SCompoundWidget.h"
#include "Styling/CoreStyle.h"
 
class ITableRow;
class SButton;
 
template<>
struct TWidgetTypeTraits<class SExpanderArrow>
{
    static constexpr bool SupportsInvalidation() { return true; }
};
 
class SExpanderArrow : public SCompoundWidget
{
    SLATE_DECLARE_WIDGET_API(SExpanderArrow, SCompoundWidget, SLATE_API)
public:
 
    SLATE_BEGIN_ARGS( SExpanderArrow )
        : _StyleSet(&FCoreStyle::Get())
        , _IndentAmount(10)
        , _BaseIndentLevel(0)
        , _ShouldDrawWires(false)
    { }
        SLATE_ARGUMENT(const ISlateStyle*, StyleSet)
        SLATE_ATTRIBUTE(float, IndentAmount)
        SLATE_ATTRIBUTE(int32, BaseIndentLevel)
        SLATE_ATTRIBUTE(bool, ShouldDrawWires)
    SLATE_END_ARGS()
 
    SLATE_API SExpanderArrow();
    SLATE_API ~SExpanderArrow();
    SLATE_API void Construct( const FArguments& InArgs, const TSharedPtr<class ITableRow>& TableRow );
 
protected:
 
    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 FReply OnArrowClicked();
 
    SLATE_API void SetIndentAmount(TAttribute<float> InIndentAmount);
    SLATE_API void SetBaseIndentLevel(TAttribute<int32> InBaseIndentLevel);
    float GetIndentAmount() const { return IndentAmountAttribute.Get(); }
    int32 GetBaseIndentLevel() const { return BaseIndentLevelAttribute.Get(); }
 
    TSlateAttributeRef<float> GetIndentAmountAttribute() const
    {
        return TSlateAttributeRef<float>{SharedThis(this), IndentAmountAttribute};
    }
 
    TSlateAttributeRef<int32> GetBaseIndentLevelAttribute() const
    {
        return TSlateAttributeRef<int32>{SharedThis(this), BaseIndentLevelAttribute};
    }
 
    SLATE_API EVisibility GetExpanderVisibility() const;
 
    SLATE_API FMargin GetExpanderPadding() const;
 
    SLATE_API const FSlateBrush* GetExpanderImage() const;
 
    TWeakPtr<class ITableRow> OwnerRowPtr;
 
    TSharedPtr<SButton> ExpanderArrow;
 
    const ISlateStyle* StyleSet;
 
#if WITH_EDITORONLY_DATA
    UE_DEPRECATED(5.7, "Use SetIndentAmount / GetIndentAmount / GetIndentAmountAttribute")
    TSlateDeprecatedTAttribute<float> IndentAmount;
 
    UE_DEPRECATED(5.7, "Use SetBaseIndentLevel / GetBaseIndentLevel / GetBaseIndentLevelAttribute")
    TSlateDeprecatedTAttribute<int32> BaseIndentLevel;
#endif
 
    TSlateAttribute<bool> ShouldDrawWires;
 
private:
    TSlateAttribute<float> IndentAmountAttribute;
    TSlateAttribute<int32> BaseIndentLevelAttribute;
};