118 lines
2.7 KiB
C++
118 lines
2.7 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Widgets/Layout/SLinkedBox.h"
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#include "Types/PaintArgs.h"
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#include "Layout/ArrangedChildren.h"
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#include "Layout/LayoutUtils.h"
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#include "Widgets/Layout/SBorder.h"
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#include "Framework/Application/SlateApplication.h"
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FLinkedBoxManager::FLinkedBoxManager()
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: CachedUniformSize(FVector2D::ZeroVector)
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{
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}
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FLinkedBoxManager::~FLinkedBoxManager()
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{
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}
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void FLinkedBoxManager::RegisterLinkedBox(SLinkedBox* InBox)
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{
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Siblings.Add(InBox);
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}
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void FLinkedBoxManager::UnregisterLinkedBox(SLinkedBox* InBox)
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{
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Siblings.Remove(InBox);
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}
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FVector2D FLinkedBoxManager::GetUniformCellSize() const
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{
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const uint32 CurrentDrawId = FSlateApplication::Get().GetCurrentDrawId();
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if (SlateApplicationDrawIdLastCached == CurrentDrawId)
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{
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return CachedUniformSize;
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}
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FVector2D MaxDesiredSize = FVector2D::ZeroVector;
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for (auto Sibling : Siblings)
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{
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if (Sibling->GetVisibility() != EVisibility::Collapsed)
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{
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Sibling->CustomChildPrepass();
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FVector2D SiblingDesiredSize = Sibling->GetChildrensDesiredSize();
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if (!SiblingDesiredSize.IsZero())
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{
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MaxDesiredSize.X = FMath::Max( MaxDesiredSize.X, SiblingDesiredSize.X );
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MaxDesiredSize.Y = FMath::Max( MaxDesiredSize.Y, SiblingDesiredSize.Y );
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}
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}
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}
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SlateApplicationDrawIdLastCached = CurrentDrawId;
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CachedUniformSize = MaxDesiredSize;
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return CachedUniformSize;
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}
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SLinkedBox::SLinkedBox()
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{
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bHasCustomPrepass = true;
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}
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SLinkedBox::~SLinkedBox()
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{
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Manager->UnregisterLinkedBox(this);
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}
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void SLinkedBox::Construct( const FArguments& InArgs, TSharedRef<FLinkedBoxManager> InManager )
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{
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Manager = InManager;
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Manager->RegisterLinkedBox(this);
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SBox::Construct( SBox::FArguments()
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.HAlign(InArgs._HAlign)
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.VAlign(InArgs._VAlign)
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.Padding(InArgs._Padding)
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.WidthOverride(InArgs._WidthOverride)
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.HeightOverride(InArgs._HeightOverride)
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.MinDesiredWidth(InArgs._MinDesiredWidth)
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.MinDesiredHeight(InArgs._MinDesiredHeight)
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.MaxDesiredWidth(InArgs._MaxDesiredWidth)
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.MaxDesiredHeight(InArgs._MaxDesiredHeight)
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.MinAspectRatio(InArgs._MinAspectRatio)
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.MaxAspectRatio(InArgs._MaxAspectRatio)
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[
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InArgs._Content.Widget
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]
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);
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}
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void SLinkedBox::CustomChildPrepass()
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{
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ChildSlot.GetWidget()->SlatePrepass();
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}
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bool SLinkedBox::CustomPrepass(float LayoutScaleMultiplier)
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{
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return false;
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}
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FVector2D SLinkedBox::GetChildrensDesiredSize() const
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{
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EVisibility ChildVisibility = ChildSlot.GetWidget()->GetVisibility();
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if ( ChildVisibility != EVisibility::Collapsed )
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{
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return ChildSlot.GetWidget()->GetDesiredSize() + ChildSlot.GetPadding().GetDesiredSize();
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}
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return FVector2D::ZeroVector;
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}
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FVector2D SLinkedBox::ComputeDesiredSize(float) const
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{
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return Manager->GetUniformCellSize();
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}
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