86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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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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class SImage;
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/**
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* Bespoke implementation of expander arrow for State Tree.
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*/
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class SStateTreeExpanderArrow : public SCompoundWidget
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{
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public:
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SLATE_BEGIN_ARGS( SStateTreeExpanderArrow )
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: _StyleSet(&FCoreStyle::Get())
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, _IndentAmount(10)
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, _BaseIndentLevel(0)
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, _Image(nullptr)
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, _ImageSize(16.f, 16.f)
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, _ImagePadding(FMargin())
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{ }
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SLATE_ARGUMENT(const ISlateStyle*, StyleSet)
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SLATE_ARGUMENT(float, IndentAmount)
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SLATE_ARGUMENT(int32, BaseIndentLevel)
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SLATE_ATTRIBUTE(const FSlateBrush*, Image)
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SLATE_ATTRIBUTE(FSlateColor, ColorAndOpacity)
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SLATE_ARGUMENT(FVector2f, ImageSize)
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SLATE_ARGUMENT(FSlateColor, WireColorAndOpacity)
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SLATE_ARGUMENT(FMargin, ImagePadding)
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SLATE_END_ARGS()
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SStateTreeExpanderArrow();
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void Construct( const FArguments& InArgs, const TSharedPtr<class ITableRow>& TableRow );
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protected:
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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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FReply OnArrowClicked();
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/** @return Visible when has children; invisible otherwise */
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EVisibility GetExpanderVisibility() const;
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/** @return the name of an image that should be shown as the expander arrow */
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const FSlateBrush* GetExpanderImage() const;
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/** @return the margin corresponding to how far this item is indented */
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FMargin GetExpanderPadding() const;
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/** Pointer to the owning row. */
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TWeakPtr<class ITableRow> OwnerRowPtr;
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/** The amount of space to indent at each level */
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float IndentAmount = 10.0f;
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/** The level in the tree that begins the indention amount */
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int32 BaseIndentLevel = 0;
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/** Color for the wires */
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FSlateColor WireColor;
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/** Size of the expander image. */
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FVector2f ImageSize = FVector2f(16, 16);
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/** Padding for the expander image. */
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FMargin ImagePadding;
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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 = nullptr;
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};
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