109 lines
3.7 KiB
C++
109 lines
3.7 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "Misc/Attribute.h"
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#include "Input/Reply.h"
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#include "Layout/Visibility.h"
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#include "Widgets/DeclarativeSyntaxSupport.h"
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#include "Layout/Margin.h"
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#include "Widgets/SCompoundWidget.h"
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#include "Styling/CoreStyle.h"
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class ITableRow;
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class SButton;
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template<>
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struct TWidgetTypeTraits<class SExpanderArrow>
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{
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static constexpr bool SupportsInvalidation() { return true; }
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};
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/**
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* Expander arrow and indentation component that can be placed in a TableRow
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* of a TreeView. Intended for use by TMultiColumnRow in TreeViews.
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*/
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class SExpanderArrow : public SCompoundWidget
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{
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SLATE_DECLARE_WIDGET_API(SExpanderArrow, SCompoundWidget, SLATE_API)
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public:
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SLATE_BEGIN_ARGS( SExpanderArrow )
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: _StyleSet(&FCoreStyle::Get())
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, _IndentAmount(10)
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, _BaseIndentLevel(0)
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, _ShouldDrawWires(false)
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{ }
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SLATE_ARGUMENT(const ISlateStyle*, StyleSet)
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/** How many Slate Units to indent for every level of the tree. */
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SLATE_ATTRIBUTE(float, IndentAmount)
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/** The level that the root of the tree should start (e.g. 2 will shift the whole tree over by `IndentAmount*2`) */
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SLATE_ATTRIBUTE(int32, BaseIndentLevel)
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/** Whether to draw the wires that visually reinforce the tree hierarchy. */
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SLATE_ATTRIBUTE(bool, ShouldDrawWires)
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SLATE_END_ARGS()
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SLATE_API SExpanderArrow();
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SLATE_API ~SExpanderArrow();
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SLATE_API void Construct( const FArguments& InArgs, const TSharedPtr<class ITableRow>& TableRow );
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protected:
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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;
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/** Invoked when the expanded button is clicked (toggle item expansion) */
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SLATE_API FReply OnArrowClicked();
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SLATE_API void SetIndentAmount(TAttribute<float> InIndentAmount);
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SLATE_API void SetBaseIndentLevel(TAttribute<int32> InBaseIndentLevel);
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float GetIndentAmount() const { return IndentAmountAttribute.Get(); }
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int32 GetBaseIndentLevel() const { return BaseIndentLevelAttribute.Get(); }
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TSlateAttributeRef<float> GetIndentAmountAttribute() const
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{
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return TSlateAttributeRef<float>{SharedThis(this), IndentAmountAttribute};
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}
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TSlateAttributeRef<int32> GetBaseIndentLevelAttribute() const
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{
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return TSlateAttributeRef<int32>{SharedThis(this), BaseIndentLevelAttribute};
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}
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/** @return Visible when has children; invisible otherwise */
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SLATE_API EVisibility GetExpanderVisibility() const;
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/** @return the margin corresponding to how far this item is indented */
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SLATE_API FMargin GetExpanderPadding() const;
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/** @return the name of an image that should be shown as the expander arrow */
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SLATE_API const FSlateBrush* GetExpanderImage() const;
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TWeakPtr<class ITableRow> OwnerRowPtr;
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/** A reference to the expander button */
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TSharedPtr<SButton> ExpanderArrow;
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/** The slate style to use */
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const ISlateStyle* StyleSet;
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#if WITH_EDITORONLY_DATA
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/** The amount of space to indent at each level */
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UE_DEPRECATED(5.7, "Use SetIndentAmount / GetIndentAmount / GetIndentAmountAttribute")
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TSlateDeprecatedTAttribute<float> IndentAmount;
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/** The level in the tree that begins the indention amount */
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UE_DEPRECATED(5.7, "Use SetBaseIndentLevel / GetBaseIndentLevel / GetBaseIndentLevelAttribute")
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TSlateDeprecatedTAttribute<int32> BaseIndentLevel;
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#endif
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/** Whether to draw the wires that visually reinforce the tree hierarchy. */
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TSlateAttribute<bool> ShouldDrawWires;
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private:
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/** The amount of space to indent at each level */
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TSlateAttribute<float> IndentAmountAttribute;
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/** The level in the tree that begins the indention amount */
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TSlateAttribute<int32> BaseIndentLevelAttribute;
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};
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