SClippingVerticalBox.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Styling/CoreStyle.h"
#include "Framework/SlateDelegates.h"
#include "Widgets/SBoxPanel.h"
#include "Styling/SlateTypes.h"
 
class FArrangedChildren;
class FPaintArgs;
class FSlateWindowElementList;
class SComboButton;
 
class SClippingVerticalBox : public SVerticalBox
{
public:
    SLATE_BEGIN_ARGS(SClippingVerticalBox) 
        : _StyleSet(&FCoreStyle::Get())
        , _StyleName(NAME_None)
        , _LabelVisibility(EVisibility::Visible)
        , _IsFocusable(true)
        , _SelectedIndex(INDEX_NONE )
        { }
 
        SLATE_ARGUMENT(FOnGetContent, OnWrapButtonClicked)
        SLATE_ARGUMENT(const ISlateStyle*, StyleSet)
        SLATE_ARGUMENT(FName, StyleName)
        SLATE_ATTRIBUTE( EVisibility, LabelVisibility)
        SLATE_ARGUMENT(bool, IsFocusable)
        SLATE_ATTRIBUTE( int32, SelectedIndex )
    SLATE_END_ARGS()
 
    
    virtual int32 OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const override;
    virtual FVector2D ComputeDesiredSize(float) const override;
 
    virtual void OnArrangeChildren( const FGeometry& AllottedGeometry, FArrangedChildren& ArrangedChildren ) const override;
 
    void Construct( const FArguments& InArgs );
 
    void AddWrapButton();
 
    TArray<TWeakPtr<SWidget>> GetClippedWidgets() const
    {
        return ClippedWidgets;
    }
 
private:
    void OnWrapButtonOpenChanged(bool bIsOpen);
    EActiveTimerReturnType UpdateWrapButtonStatus(double CurrentTime, float DeltaTime);
 
    void InitializeWrapButton( TSharedPtr<SComboButton>& Button, bool bCreateSelectedAppearance );
    
private:
    TSharedPtr<SComboButton> WrapButton;
 
    TSharedPtr<SComboButton> SelectedWrapButton;
 
    FOnGetContent OnWrapButtonClicked;
 
    TSharedPtr<FActiveTimerHandle> WrapButtonOpenTimer;
 
    bool bIsFocusable = true;
 
    const ISlateStyle* StyleSet = nullptr;
 
    FButtonStyle Style;
    
    FButtonStyle SelectedStyle;
 
    TAttribute<int32> SelectedIndex = INDEX_NONE;
 
    mutable int32 LastToolBarButtonIndex = INDEX_NONE;
 
    FName StyleName;
 
    mutable TArray<TWeakPtr<SWidget>> ClippedWidgets;
    mutable TArray<int32> ClippedIndices;
};