SLinkedBox.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Attribute.h"
#include "Layout/Visibility.h"
#include "SlotBase.h"
#include "Containers/Ticker.h"
#include "Layout/Margin.h"
#include "Layout/Children.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SPanel.h"
#include "Types/SlateEnums.h"
#include "Widgets/Layout/SBox.h"
    
 
class FArrangedChildren;
 
class SLinkedBox;
 
class FLinkedBoxManager : public TSharedFromThis<FLinkedBoxManager> 
{
 
public: 
 
    SLATE_API FLinkedBoxManager();
    SLATE_API ~FLinkedBoxManager();
 
    /* Add an SLinkedBox */
    SLATE_API void RegisterLinkedBox(SLinkedBox* InBox);
 
    /* Remove an SLinkedBox */
    SLATE_API void UnregisterLinkedBox(SLinkedBox* InBox);
 
    /* Used by the individual SLinkedBoxes to acquire the computed uniform size */
    SLATE_API FVector2D GetUniformCellSize() const;
 
protected:
    
    mutable uint32 SlateApplicationDrawIdLastCached = 0;
    mutable FVector2D CachedUniformSize;
 
private:
 
    TSet< SLinkedBox* > Siblings;
 
};
 
class SLinkedBox: public SBox
{
 
public:
 
    SLATE_BEGIN_ARGS(SLinkedBox)
        : _HAlign(HAlign_Fill)
        , _VAlign(VAlign_Fill)
        , _Padding(0.0f)
        , _Content()
        , _WidthOverride(FOptionalSize())
        , _HeightOverride(FOptionalSize())
        , _MinDesiredWidth(FOptionalSize())
        , _MinDesiredHeight(FOptionalSize())
        , _MaxDesiredWidth(FOptionalSize())
        , _MaxDesiredHeight(FOptionalSize())
    {
        _Visibility = EVisibility::SelfHitTestInvisible;
    }
 
    SLATE_ARGUMENT(EHorizontalAlignment, HAlign)
 
    
    SLATE_ARGUMENT(EVerticalAlignment, VAlign)
 
    
    SLATE_ATTRIBUTE(FMargin, Padding)
 
    
    SLATE_DEFAULT_SLOT(FArguments, Content)
 
    
    SLATE_ATTRIBUTE(FOptionalSize, WidthOverride)
 
    
    SLATE_ATTRIBUTE(FOptionalSize, HeightOverride)
 
    
    SLATE_ATTRIBUTE(FOptionalSize, MinDesiredWidth)
 
    
    SLATE_ATTRIBUTE(FOptionalSize, MinDesiredHeight)
 
    
    SLATE_ATTRIBUTE(FOptionalSize, MaxDesiredWidth)
 
    
    SLATE_ATTRIBUTE(FOptionalSize, MaxDesiredHeight)
 
    SLATE_ATTRIBUTE(FOptionalSize, MinAspectRatio)
 
    SLATE_ATTRIBUTE(FOptionalSize, MaxAspectRatio)
 
    SLATE_END_ARGS()
 
    SLATE_API FVector2D GetChildrensDesiredSize() const;
 
    SLATE_API virtual FVector2D ComputeDesiredSize(float) const override;
 
    SLATE_API void Construct( const FArguments& InArgs, TSharedRef<FLinkedBoxManager> InManager ); 
 
    SLATE_API SLinkedBox();
    SLATE_API ~SLinkedBox();
    
protected:
 
    SLATE_API virtual bool CustomPrepass(float LayoutScaleMultiplier) override;
 
    SLATE_API void CustomChildPrepass();
 
    friend class FLinkedBoxManager;
 
private:
 
    TSharedPtr<FLinkedBoxManager> Manager;
 
};