void FCachedWidgetNode::Initialize(const FPaintArgs& Args, TSharedRef<SWidget> InWidget, const FGeometry& InGeometry, const FSlateRect& InClippingRect)
{
	Widget = InWidget;
	Geometry = InGeometry;
	ClippingRect = InClippingRect;
	WindowOffset = Args.GetWindowToDesktopTransform();
	RecordedVisibility = Args.GetLastRecordedVisibility();
	LastRecordedHittestIndex = 0;

	if ( RecordedVisibility.AreChildrenHitTestVisible() )
	{
		RecordedVisibility = InWidget->GetVisibility();
	}

	Children.Reset();
}
Beispiel #2
0
/**
 * This widget was created before render transforms existed for each widget, and it chose to apply the render transform AFTER the layout transform.
 * This means leveraging the render transform of FGeometry would be expensive, as we would need to use Concat(LayoutTransform, RenderTransform, Inverse(LayoutTransform).
 * Instead, we maintain the old way of doing it by modifying the AllottedGeometry only during rendering to append the widget's implied RenderTransform to the existing LayoutTransform.
 */
int32 SFxWidget::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	// Convert the 0..1 origin into local space extents.
	const FVector2D ScaleOrigin = RenderScaleOrigin.Get() * AllottedGeometry.Size;
	const FVector2D Offset = VisualOffset.Get() * AllottedGeometry.Size;
	// create the render transform as a scale around ScaleOrigin and offset it by Offset.
	const auto RenderTransform = Concatenate(Inverse(ScaleOrigin), RenderScale.Get(), ScaleOrigin, Offset);
	// This will append the render transform to the layout transform, and we only use it for rendering.
	FGeometry ModifiedGeometry = AllottedGeometry.MakeChild(AllottedGeometry.Size, RenderTransform);
	
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	this->ArrangeChildren(ModifiedGeometry, ArrangedChildren);

	// There may be zero elements in this array if our child collapsed/hidden
	if( ArrangedChildren.Num() > 0 )
	{
		// We can only have one direct descendant.
		check( ArrangedChildren.Num() == 1 );
		const FArrangedWidget& TheChild = ArrangedChildren[0];

		// SFxWidgets are able to ignore parent clipping.
		const FSlateRect ChildClippingRect = (bIgnoreClipping.Get())
			? ModifiedGeometry.GetClippingRect()
			: MyClippingRect.IntersectionWith(ModifiedGeometry.GetClippingRect());

		FWidgetStyle CompoundedWidgetStyle = FWidgetStyle(InWidgetStyle)
			.BlendColorAndOpacityTint(ColorAndOpacity.Get())
			.SetForegroundColor( ForegroundColor );

		return TheChild.Widget->Paint( Args.WithNewParent(this), TheChild.Geometry, ChildClippingRect, OutDrawElements, LayerId + 1, CompoundedWidgetStyle, ShouldBeEnabled( bParentEnabled ) );
	}
	return LayerId;

}
int32 SPanel::PaintArrangedChildren( const FPaintArgs& Args, const FArrangedChildren& ArrangedChildren, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled  ) const
{
	// Because we paint multiple children, we must track the maximum layer id that they produced in case one of our parents
	// wants to an overlay for all of its contents.
	int32 MaxLayerId = LayerId;

	const FPaintArgs NewArgs = Args.WithNewParent(this);

	for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
	{
		const FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];

		bool bWereOverlapping;
		FSlateRect ChildClipRect = MyClippingRect.IntersectionWith(CurWidget.Geometry.GetClippingRect(), bWereOverlapping);
		
		if ( bWereOverlapping )
		{
			const int32 CurWidgetsMaxLayerId = CurWidget.Widget->Paint(NewArgs, CurWidget.Geometry, ChildClipRect, OutDrawElements, LayerId, InWidgetStyle, ShouldBeEnabled(bParentEnabled));
			MaxLayerId = FMath::Max(MaxLayerId, CurWidgetsMaxLayerId);
		}		
		
	}
	
	return MaxLayerId;
}
/** SWidget Interface */
int32 SSequencerSectionAreaView::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	ArrangeChildren(AllottedGeometry, ArrangedChildren);

	if( SectionAreaNode.IsValid() )
	{
		// Draw a region around the entire section area
		FSlateDrawElement::MakeBox( 
			OutDrawElements, 
			LayerId,
			AllottedGeometry.ToPaintGeometry(),
			BackgroundBrush,
			MyClippingRect,
			ESlateDrawEffect::None,
			SequencerSectionAreaConstants::BackgroundColor
			);
	}

	for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
	{
		FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
		FSlateRect ChildClipRect = MyClippingRect.IntersectionWith( CurWidget.Geometry.GetClippingRect() );
		const int32 CurWidgetsMaxLayerId = CurWidget.Widget->Paint( Args.WithNewParent(this), CurWidget.Geometry, ChildClipRect, OutDrawElements, LayerId+1, InWidgetStyle, ShouldBeEnabled( bParentEnabled ) );
	}

	return LayerId+1;
}
int32 SDockingTabWell::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	// When we are dragging a tab, it must be painted on top of the other tabs, so we cannot
	// just reuse the Panel's default OnPaint.


	// The TabWell has no visualization of its own; it just visualizes its child tabs.
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	this->ArrangeChildren(AllottedGeometry, ArrangedChildren);

	// Because we paint multiple children, we must track the maximum layer id that they produced in case one of our parents
	// wants to an overlay for all of its contents.
	int32 MaxLayerId = LayerId;

	TSharedPtr<SDockTab> ForegroundTab = GetForegroundTab();
	FArrangedWidget* ForegroundTabGeometry = NULL;
	
	// Draw all inactive tabs first
	for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
	{
		FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
		if (CurWidget.Widget == ForegroundTab)
		{
			ForegroundTabGeometry = &CurWidget;
		}
		else
		{
			FSlateRect ChildClipRect = MyClippingRect.IntersectionWith( CurWidget.Geometry.GetClippingRect() );
			const int32 CurWidgetsMaxLayerId = CurWidget.Widget->Paint( Args.WithNewParent(this), CurWidget.Geometry, ChildClipRect, OutDrawElements, MaxLayerId, InWidgetStyle, ShouldBeEnabled( bParentEnabled ) );
			MaxLayerId = FMath::Max( MaxLayerId, CurWidgetsMaxLayerId );
		}
	}

	// Draw active tab in front
	if (ForegroundTab != TSharedPtr<SDockTab>())
	{
		FSlateRect ChildClipRect = MyClippingRect.IntersectionWith( ForegroundTabGeometry->Geometry.GetClippingRect() );
		const int32 CurWidgetsMaxLayerId = ForegroundTabGeometry->Widget->Paint( Args.WithNewParent(this), ForegroundTabGeometry->Geometry, ChildClipRect, OutDrawElements, MaxLayerId, InWidgetStyle, ShouldBeEnabled( bParentEnabled ) );
		MaxLayerId = FMath::Max( MaxLayerId, CurWidgetsMaxLayerId );
	}

	return MaxLayerId;
}
Beispiel #6
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int32 SGridPanel::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
    FArrangedChildren ArrangedChildren(EVisibility::All);
    this->ArrangeChildren(AllottedGeometry, ArrangedChildren);

    // Because we paint multiple children, we must track the maximum layer id that they produced in case one of our parents
    // wants to an overlay for all of its contents.
    int32 MaxLayerId = LayerId;

    // We need to iterate over slots, because slots know the GridLayers. This isn't available in the arranged children.
    // Some slots do not show up (they are hidden/collapsed). We need a 2nd index to skip over them.
    //
    // GridLayers must ensure that everything in LayerN is below LayerN+1. In other words,
    // every grid layer group must start at the current MaxLayerId (similar to how SOverlay works).
    int32 LastGridLayer = 0;
    for (int32 ChildIndex = 0; ChildIndex < Slots.Num(); ++ChildIndex)
    {
        FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
        if (CurWidget.Widget->GetVisibility().IsVisible())
        {
            const FSlot& CurSlot = Slots[ChildIndex];

            FSlateRect ChildClipRect = MyClippingRect.IntersectionWith( CurWidget.Geometry.GetClippingRect() );

            if ( LastGridLayer != CurSlot.LayerParam )
            {
                // We starting a new grid layer group?
                LastGridLayer = CurSlot.LayerParam;
                // Ensure that everything here is drawn on top of
                // previously drawn grid content.
                LayerId = MaxLayerId+1;
            }

            const int32 CurWidgetsMaxLayerId = CurWidget.Widget->Paint(
                                                   Args.WithNewParent(this),
                                                   CurWidget.Geometry,
                                                   ChildClipRect,
                                                   OutDrawElements,
                                                   LayerId,
                                                   InWidgetStyle,
                                                   ShouldBeEnabled( bParentEnabled )
                                               );

            MaxLayerId = FMath::Max( MaxLayerId, CurWidgetsMaxLayerId );
        }
    }

//#define LAYOUT_DEBUG

#ifdef LAYOUT_DEBUG
    LayerId = LayoutDebugPaint( AllottedGeometry, MyClippingRect, OutDrawElements, LayerId );
#endif

    return MaxLayerId;
}
Beispiel #7
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int32 SMenuAnchor::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	FArrangedChildren ArrangedChildren( EVisibility::Visible );
	ArrangeChildren( AllottedGeometry, ArrangedChildren );
	
	// There may be zero elements in this array if our child collapsed/hidden
	if ( ArrangedChildren.Num() > 0 )
	{
		const FArrangedWidget& FirstChild = ArrangedChildren[0];

		// In the case where the user doesn't provide content to the menu anchor, the null widget
		// wont appear in the visible set of arranged children, so only immediately paint the first child,
		// if it's visible and matches the first slot content.
		const bool bHasArrangedAnchorContent = FirstChild.Widget == Children[0].GetWidget();
		if ( bHasArrangedAnchorContent )
		{
			const FSlateRect ChildClippingRect = AllottedGeometry.GetClippingRect().IntersectionWith(MyClippingRect);
			LayerId = FirstChild.Widget->Paint(Args.WithNewParent(this), FirstChild.Geometry, ChildClippingRect, OutDrawElements, LayerId + 1, InWidgetStyle, ShouldBeEnabled(bParentEnabled));
		}

		const bool bIsOpen = IsOpen();

		if ( bIsOpen )
		{
			// In the case where the anchor content is present and visible, it's the 1 index child, in the case
			// where the anchor content is invisible, it's the 0 index child.
			FArrangedWidget* PopupChild = nullptr;
			if ( bHasArrangedAnchorContent && ArrangedChildren.Num() > 1 )
			{
				PopupChild = &ArrangedChildren[1];
			}
			else if ( !bHasArrangedAnchorContent && ArrangedChildren.Num() == 1 )
			{
				PopupChild = &ArrangedChildren[0];
			}

			if ( PopupChild != nullptr )
			{
				 OutDrawElements.QueueDeferredPainting(
					FSlateWindowElementList::FDeferredPaint(PopupChild->Widget, Args, PopupChild->Geometry, MyClippingRect, InWidgetStyle, bParentEnabled));
			}
		} 
	}

	return LayerId;
}
int32 SBox::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	// An SBox just draws its only child
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	this->ArrangeChildren(AllottedGeometry, ArrangedChildren);

	// Maybe none of our children are visible
	if( ArrangedChildren.Num() > 0 )
	{
		check( ArrangedChildren.Num() == 1 );
		FArrangedWidget& TheChild = ArrangedChildren[0];

		const FSlateRect ChildClippingRect = AllottedGeometry.GetClippingRect().InsetBy( ChildSlot.SlotPadding.Get() * AllottedGeometry.Scale ).IntersectionWith(MyClippingRect);

		return TheChild.Widget->Paint( Args.WithNewParent(this), TheChild.Geometry, ChildClippingRect, OutDrawElements, LayerId, InWidgetStyle, ShouldBeEnabled( bParentEnabled ) );
	}
	return LayerId;
}
Beispiel #9
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int32 SConstraintCanvas::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	this->ArrangeChildren(AllottedGeometry, ArrangedChildren);

	// Because we paint multiple children, we must track the maximum layer id that they produced in case one of our parents
	// wants to an overlay for all of its contents.
	int32 MaxLayerId = LayerId;

	for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
	{
		FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
		FSlateRect ChildClipRect = MyClippingRect.IntersectionWith(CurWidget.Geometry.GetClippingRect());
		const int32 CurWidgetsMaxLayerId = CurWidget.Widget->Paint( Args.WithNewParent(this), CurWidget.Geometry, ChildClipRect, OutDrawElements, MaxLayerId + 1, InWidgetStyle, ShouldBeEnabled(bParentEnabled));

		MaxLayerId = FMath::Max(MaxLayerId, CurWidgetsMaxLayerId);
	}

	return MaxLayerId;
}
int32 SSequencerTrackArea::OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	ArrangeChildren(AllottedGeometry, ArrangedChildren);

	for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
	{
		FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
		FSlateRect ChildClipRect = MyClippingRect.IntersectionWith( CurWidget.Geometry.GetClippingRect() );
		const int32 ThisWidgetLayerId = CurWidget.Widget->Paint( Args.WithNewParent(this), CurWidget.Geometry, ChildClipRect, OutDrawElements, LayerId + 1, InWidgetStyle, ShouldBeEnabled( bParentEnabled ) );

		LayerId = FMath::Max(LayerId, ThisWidgetLayerId);
	}

	auto SequencerPin = SequencerWidget.Pin();
	if (SequencerPin.IsValid())
	{
		return SequencerPin->GetEditTool().OnPaint(AllottedGeometry, MyClippingRect, OutDrawElements, LayerId + 1);
	}

	return LayerId;
}
int32 SResponsiveGridPanel::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	FArrangedChildren ArrangedChildren(EVisibility::All);
	this->ArrangeChildren(AllottedGeometry, ArrangedChildren);

	// Because we paint multiple children, we must track the maximum layer id that they produced in case one of our parents
	// wants to an overlay for all of its contents.
	int32 MaxLayerId = LayerId;

	// We need to iterate over slots, because slots know the GridLayers. This isn't available in the arranged children.
	// Some slots do not show up (they are hidden/collapsed). We need a 2nd index to skip over them.
	 
	for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
	{
		FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
		if (CurWidget.Widget->GetVisibility().IsVisible())
		{
			FSlateRect ChildClipRect = MyClippingRect.IntersectionWith( CurWidget.Geometry.GetClippingRect() );

			const int32 CurWidgetsMaxLayerId = CurWidget.Widget->Paint(
				Args.WithNewParent(this),
				CurWidget.Geometry,
				ChildClipRect,
				OutDrawElements,
				LayerId,
				InWidgetStyle,
				ShouldBeEnabled( bParentEnabled )
			);
			
			MaxLayerId = FMath::Max( MaxLayerId, CurWidgetsMaxLayerId );
		}
	}

#ifdef LAYOUT_DEBUG
	LayerId = LayoutDebugPaint( AllottedGeometry, MyClippingRect, OutDrawElements, LayerId );
#endif

	return MaxLayerId;
}
int32 SPopup::OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const
{
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	this->ArrangeChildren(AllottedGeometry, ArrangedChildren);

	// There may be zero elements in this array if our child collapsed/hidden
	if (ArrangedChildren.Num() > 0)
	{
		check(ArrangedChildren.Num() == 1);
		FArrangedWidget& TheChild = ArrangedChildren[0];

		FWidgetStyle CompoundedWidgetStyle = FWidgetStyle(InWidgetStyle)
			.BlendColorAndOpacityTint(ColorAndOpacity.Get())
			.SetForegroundColor(GetForegroundColor());

		// An SPopup just queues up its children to be painted after everything in this window is done painting.
		OutDrawElements.QueueDeferredPainting(
			FSlateWindowElementList::FDeferredPaint(TheChild.Widget, Args.WithNewParent(this), TheChild.Geometry, MyClippingRect, CompoundedWidgetStyle, ShouldBeEnabled(bParentEnabled))
		);
	}
	return LayerId;
}
Beispiel #13
0
int32 SWeakWidget::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	// Just draw the children.
	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	this->ArrangeChildren(AllottedGeometry, ArrangedChildren);

	// There may be zero elements in this array if our child collapsed/hidden
	if( ArrangedChildren.Num() > 0 )
	{
		check( ArrangedChildren.Num() == 1 );
		FArrangedWidget& TheChild = ArrangedChildren[0];

		return TheChild.Widget->Paint( 
			Args.WithNewParent(this), 
			TheChild.Geometry, 
			MyClippingRect, 
			OutDrawElements, 
			LayerId + 1,
			InWidgetStyle, 
			ShouldBeEnabled( bParentEnabled ) );
	}
	return LayerId;
}
int32 SInvalidationPanel::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
	if ( GetCanCache() )
	{
		const bool bWasCachingNeeded = bNeedsCaching;

		if ( bNeedsCaching )
		{
			SInvalidationPanel* MutableThis = const_cast<SInvalidationPanel*>( this );

			// Always set the caching flag to false first, during the paint / tick pass we may change something
			// to volatile and need to re-cache.
			bNeedsCaching = false;

			bIsInvalidating = true;

			if ( !CachedWindowElements.IsValid() || CachedWindowElements->GetWindow() != OutDrawElements.GetWindow() )
			{
				CachedWindowElements = MakeShareable(new FSlateWindowElementList(OutDrawElements.GetWindow()));
			}
			else
			{
				CachedWindowElements->Reset();
			}

			// Reset the cached node pool index so that we effectively reset the pool.
			LastUsedCachedNodeIndex = 0;

			RootCacheNode = CreateCacheNode();
			RootCacheNode->Initialize(Args, SharedThis(MutableThis), AllottedGeometry, MyClippingRect);

			//TODO: When SWidget::Paint is called don't drag self if volatile, and we're doing a cache pass.
			CachedMaxChildLayer = SCompoundWidget::OnPaint(
				Args.EnableCaching(SharedThis(MutableThis), RootCacheNode, true, false),
				AllottedGeometry,
				MyClippingRect,
				*CachedWindowElements.Get(),
				LayerId,
				InWidgetStyle,
				bParentEnabled);

			if ( bCacheRelativeTransforms )
			{
				CachedAbsolutePosition = AllottedGeometry.Position;
			}

			LastLayerId = LayerId;
			LastHitTestIndex = Args.GetLastHitTestIndex();

			bIsInvalidating = false;
		}

		// The hit test grid is actually populated during the initial cache phase, so don't bother
		// recording the hit test geometry on the same frame that we regenerate the cache.
		if ( bWasCachingNeeded == false )
		{
			RootCacheNode->RecordHittestGeometry(Args.GetGrid(), Args.GetLastHitTestIndex());
		}

		if ( bCacheRelativeTransforms )
		{
			FVector2D DeltaPosition = AllottedGeometry.Position - CachedAbsolutePosition;

			const TArray<FSlateDrawElement>& CachedElements = CachedWindowElements->GetDrawElements();
			const int32 CachedElementCount = CachedElements.Num();
			for ( int32 Index = 0; Index < CachedElementCount; Index++ )
			{
				const FSlateDrawElement& LocalElement = CachedElements[Index];
				FSlateDrawElement AbsElement = LocalElement;

				AbsElement.SetPosition(LocalElement.GetPosition() + DeltaPosition);
				AbsElement.SetClippingRect(LocalElement.GetClippingRect().OffsetBy(DeltaPosition));

				OutDrawElements.AddItem(AbsElement);
			}
		}
		else
		{
			OutDrawElements.AppendDrawElements(CachedWindowElements->GetDrawElements());
		}

		int32 OutMaxChildLayer = CachedMaxChildLayer;

		// Paint the volatile elements
		if ( CachedWindowElements.IsValid() )
		{
			OutMaxChildLayer = FMath::Max(CachedMaxChildLayer, CachedWindowElements->PaintVolatile(OutDrawElements));
		}

#if !UE_BUILD_SHIPPING

		if ( IsInvalidationDebuggingEnabled() )
		{
			// Draw a green or red border depending on if we were invalidated this frame.
			{
				check(Args.IsCaching() == false);
				//const bool bShowOutlineAsCached = Args.IsCaching() || bWasCachingNeeded == false;
				const FLinearColor DebugTint = bWasCachingNeeded ? FLinearColor::Red : FLinearColor::Green;

				FGeometry ScaledOutline = AllottedGeometry.MakeChild(FVector2D(0, 0), AllottedGeometry.GetLocalSize() * AllottedGeometry.Scale, Inverse(AllottedGeometry.Scale));

				FSlateDrawElement::MakeBox(
					OutDrawElements,
					++OutMaxChildLayer,
					ScaledOutline.ToPaintGeometry(),
					FCoreStyle::Get().GetBrush(TEXT("Debug.Border")),
					MyClippingRect,
					ESlateDrawEffect::None,
					DebugTint
				);
			}

			// Draw a yellow outline around any volatile elements.
			const TArray< TSharedRef<FSlateWindowElementList::FVolatilePaint> >& VolatileElements = CachedWindowElements->GetVolatileElements();
			for ( const TSharedRef<FSlateWindowElementList::FVolatilePaint>& VolatileElement : VolatileElements )
			{
				FSlateDrawElement::MakeBox(
					OutDrawElements,
					++OutMaxChildLayer,
					VolatileElement->GetGeometry().ToPaintGeometry(),
					FCoreStyle::Get().GetBrush(TEXT("FocusRectangle")),
					MyClippingRect,
					ESlateDrawEffect::None,
					FLinearColor::Yellow
				);
			}

			// Draw a white flash for any widget that invalidated us this frame.
			for ( TWeakPtr<SWidget> Invalidator : InvalidatorWidgets )
			{
				TSharedPtr<SWidget> SafeInvalidator = Invalidator.Pin();
				if ( SafeInvalidator.IsValid() )
				{
					FWidgetPath WidgetPath;
					if ( FSlateApplication::Get().GeneratePathToWidgetUnchecked(SafeInvalidator.ToSharedRef(), WidgetPath, EVisibility::All) )
					{
						FArrangedWidget ArrangedWidget = WidgetPath.FindArrangedWidget(SafeInvalidator.ToSharedRef()).Get(FArrangedWidget::NullWidget);
						ArrangedWidget.Geometry.AppendTransform( FSlateLayoutTransform(Inverse(Args.GetWindowToDesktopTransform())) );

						FSlateDrawElement::MakeBox(
							OutDrawElements,
							++OutMaxChildLayer,
							ArrangedWidget.Geometry.ToPaintGeometry(),
							FCoreStyle::Get().GetBrush(TEXT("WhiteBrush")),
							MyClippingRect,
							ESlateDrawEffect::None,
							FLinearColor::White.CopyWithNewOpacity(0.6f)
						);
					}
				}
			}

			InvalidatorWidgets.Reset();
		}

#endif

		return OutMaxChildLayer;
	}
	else
	{
		return SCompoundWidget::OnPaint(Args, AllottedGeometry, MyClippingRect, OutDrawElements, LayerId, InWidgetStyle, bParentEnabled);
	}
}
Beispiel #15
0
int32 SGraphPanel::OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const
{
#if SLATE_HD_STATS
	SCOPE_CYCLE_COUNTER( STAT_SlateOnPaint_SGraphPanel );
#endif

	CachedAllottedGeometryScaledSize = AllottedGeometry.Size * AllottedGeometry.Scale;

	//Style used for objects that are the same between revisions
	FWidgetStyle FadedStyle = InWidgetStyle;
	FadedStyle.BlendColorAndOpacityTint(FLinearColor(0.45f,0.45f,0.45f,0.45f));

	// First paint the background
	const UEditorExperimentalSettings& Options = *GetDefault<UEditorExperimentalSettings>();

	const FSlateBrush* BackgroundImage = FEditorStyle::GetBrush(TEXT("Graph.Panel.SolidBackground"));
	PaintBackgroundAsLines(BackgroundImage, AllottedGeometry, MyClippingRect, OutDrawElements, LayerId);

	const float ZoomFactor = AllottedGeometry.Scale * GetZoomAmount();

	FArrangedChildren ArrangedChildren(EVisibility::Visible);
	ArrangeChildNodes(AllottedGeometry, ArrangedChildren);

	// Determine some 'global' settings based on current LOD
	const bool bDrawShadowsThisFrame = GetCurrentLOD() > EGraphRenderingLOD::LowestDetail;

	// Because we paint multiple children, we must track the maximum layer id that they produced in case one of our parents
	// wants to an overlay for all of its contents.

	// Save LayerId for comment boxes to ensure they always appear below nodes & wires
	const int32 CommentNodeShadowLayerId = LayerId++;
	const int32 CommentNodeLayerId = LayerId++;

	// Save a LayerId for wires, which appear below nodes but above comments
	// We will draw them later, along with the arrows which appear above nodes.
	const int32 WireLayerId = LayerId++;

	const int32 NodeShadowsLayerId = LayerId;
	const int32 NodeLayerId = NodeShadowsLayerId + 1;
	int32 MaxLayerId = NodeLayerId;

	const FVector2D NodeShadowSize = GetDefault<UGraphEditorSettings>()->GetShadowDeltaSize();
	const UEdGraphSchema* Schema = GraphObj->GetSchema();

	// Draw the child nodes
	{
		// When drawing a marquee, need a preview of what the selection will be.
		const FGraphPanelSelectionSet* SelectionToVisualize = &(SelectionManager.SelectedNodes);
		FGraphPanelSelectionSet SelectionPreview;
		if ( Marquee.IsValid() )
		{			
			ApplyMarqueeSelection(Marquee, SelectionManager.SelectedNodes, SelectionPreview);
			SelectionToVisualize = &SelectionPreview;
		}

		// Context for rendering node infos
		FKismetNodeInfoContext Context(GraphObj);

		TArray<FGraphDiffControl::FNodeMatch> NodeMatches;
		for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
		{
			FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
			TSharedRef<SGraphNode> ChildNode = StaticCastSharedRef<SGraphNode>(CurWidget.Widget);
			
			// Examine node to see what layers we should be drawing in
			int32 ShadowLayerId = NodeShadowsLayerId;
			int32 ChildLayerId = NodeLayerId;

			// If a comment node, draw in the dedicated comment slots
			{
				UObject* NodeObj = ChildNode->GetObjectBeingDisplayed();
				if (NodeObj && NodeObj->IsA(UEdGraphNode_Comment::StaticClass()))
				{
					ShadowLayerId = CommentNodeShadowLayerId;
					ChildLayerId = CommentNodeLayerId;
				}
			}


			const bool bNodeIsVisible = FSlateRect::DoRectanglesIntersect( CurWidget.Geometry.GetClippingRect(), MyClippingRect );

			if (bNodeIsVisible)
			{
				const bool bSelected = SelectionToVisualize->Contains( StaticCastSharedRef<SNodePanel::SNode>(CurWidget.Widget)->GetObjectBeingDisplayed() );

				// Handle Node renaming once the node is visible
				if( bSelected && ChildNode->IsRenamePending() )
				{
					ChildNode->ApplyRename();
				}

				// Draw the node's shadow.
				if (bDrawShadowsThisFrame || bSelected)
				{
					const FSlateBrush* ShadowBrush = ChildNode->GetShadowBrush(bSelected);
					FSlateDrawElement::MakeBox(
						OutDrawElements,
						ShadowLayerId,
						CurWidget.Geometry.ToInflatedPaintGeometry(NodeShadowSize),
						ShadowBrush,
						MyClippingRect
						);
				}

				// Draw the comments and information popups for this node, if it has any.
				{
					const SNodePanel::SNode::FNodeSlot& CommentSlot = ChildNode->GetOrAddSlot( ENodeZone::TopCenter );
					float CommentBubbleY = -CommentSlot.Offset.Get().Y;
					Context.bSelected = bSelected;
					TArray<FGraphInformationPopupInfo> Popups;

					{
						ChildNode->GetNodeInfoPopups(&Context, /*out*/ Popups);
					}

					for (int32 PopupIndex = 0; PopupIndex < Popups.Num(); ++PopupIndex)
					{
						FGraphInformationPopupInfo& Popup = Popups[PopupIndex];
						PaintComment(Popup.Message, CurWidget.Geometry, MyClippingRect, OutDrawElements, ChildLayerId, Popup.BackgroundColor, /*inout*/ CommentBubbleY, InWidgetStyle);
					}
				}

				int32 CurWidgetsMaxLayerId;
				{
					UEdGraphNode* NodeObj = Cast<UEdGraphNode>(ChildNode->GetObjectBeingDisplayed());

					/** When diffing nodes, nodes that are different between revisions are opaque, nodes that have not changed are faded */
					FGraphDiffControl::FNodeMatch NodeMatch = FGraphDiffControl::FindNodeMatch(GraphObjToDiff, NodeObj, NodeMatches);
					if (NodeMatch.IsValid())
					{
						NodeMatches.Add(NodeMatch);
					}
					const bool bNodeIsDifferent = (!GraphObjToDiff || NodeMatch.Diff());

					/* When dragging off a pin, we want to duck the alpha of some nodes */
					TSharedPtr< SGraphPin > OnlyStartPin = (1 == PreviewConnectorFromPins.Num()) ? PreviewConnectorFromPins[0].FindInGraphPanel(*this) : TSharedPtr< SGraphPin >();
					const bool bNodeIsNotUsableInCurrentContext = Schema->FadeNodeWhenDraggingOffPin(NodeObj, OnlyStartPin.IsValid() ? OnlyStartPin.Get()->GetPinObj() : NULL);
					const FWidgetStyle& NodeStyleToUse = (bNodeIsDifferent && !bNodeIsNotUsableInCurrentContext)? InWidgetStyle : FadedStyle;

					// Draw the node.O
					CurWidgetsMaxLayerId = CurWidget.Widget->Paint( Args.WithNewParent(this), CurWidget.Geometry, MyClippingRect, OutDrawElements, ChildLayerId, NodeStyleToUse, ShouldBeEnabled( bParentEnabled ) );
				}

				// Draw the node's overlay, if it has one.
				{
					// Get its size
					const FVector2D WidgetSize = CurWidget.Geometry.Size;

					{
						TArray<FOverlayBrushInfo> OverlayBrushes;
						ChildNode->GetOverlayBrushes(bSelected, WidgetSize, /*out*/ OverlayBrushes);

						for (int32 BrushIndex = 0; BrushIndex < OverlayBrushes.Num(); ++BrushIndex)
						{
							FOverlayBrushInfo& OverlayInfo = OverlayBrushes[BrushIndex];
							const FSlateBrush* OverlayBrush = OverlayInfo.Brush;
							if(OverlayBrush != NULL)
							{
								FPaintGeometry BouncedGeometry = CurWidget.Geometry.ToPaintGeometry(OverlayInfo.OverlayOffset, OverlayBrush->ImageSize, 1.f);

								// Handle bouncing
								const float BounceValue = FMath::Sin(2.0f * PI * BounceCurve.GetLerpLooping());
								BouncedGeometry.DrawPosition += (OverlayInfo.AnimationEnvelope * BounceValue * ZoomFactor);

								CurWidgetsMaxLayerId++;
								FSlateDrawElement::MakeBox(
									OutDrawElements,
									CurWidgetsMaxLayerId,
									BouncedGeometry,
									OverlayBrush,
									MyClippingRect
									);
							}

						}
					}

					{
						TArray<FOverlayWidgetInfo> OverlayWidgets = ChildNode->GetOverlayWidgets(bSelected, WidgetSize);

						for (int32 WidgetIndex = 0; WidgetIndex < OverlayWidgets.Num(); ++WidgetIndex)
						{
							FOverlayWidgetInfo& OverlayInfo = OverlayWidgets[WidgetIndex];
							if(OverlayInfo.Widget->GetVisibility() == EVisibility::Visible)
							{
								// call SlatePrepass as these widgets are not in the 'normal' child hierarchy
								OverlayInfo.Widget->SlatePrepass();

								const FGeometry WidgetGeometry = CurWidget.Geometry.MakeChild(OverlayInfo.OverlayOffset, OverlayInfo.Widget->GetDesiredSize(), 1.f);

								OverlayInfo.Widget->Paint(Args.WithNewParent(this), WidgetGeometry, MyClippingRect, OutDrawElements, CurWidgetsMaxLayerId, InWidgetStyle, bParentEnabled);
							}
						}
					}
				}

				MaxLayerId = FMath::Max( MaxLayerId, CurWidgetsMaxLayerId + 1 );
			}
		}
	}

	MaxLayerId += 1;


	// Draw connections between pins 
	if (Children.Num() > 0 )
	{

		//@TODO: Pull this into a factory like the pin and node ones
		FConnectionDrawingPolicy* ConnectionDrawingPolicy;
		{
			ConnectionDrawingPolicy = Schema->CreateConnectionDrawingPolicy(WireLayerId, MaxLayerId, ZoomFactor, MyClippingRect, OutDrawElements, GraphObj);
			if (!ConnectionDrawingPolicy)
			{
				if (Schema->IsA(UAnimationGraphSchema::StaticClass()))
				{
					ConnectionDrawingPolicy = new FAnimGraphConnectionDrawingPolicy(WireLayerId, MaxLayerId, ZoomFactor, MyClippingRect, OutDrawElements, GraphObj);
				}
				else if (Schema->IsA(UAnimationStateMachineSchema::StaticClass()))
				{
					ConnectionDrawingPolicy = new FStateMachineConnectionDrawingPolicy(WireLayerId, MaxLayerId, ZoomFactor, MyClippingRect, OutDrawElements, GraphObj);
				}
				else if (Schema->IsA(UEdGraphSchema_K2::StaticClass()))
				{
					ConnectionDrawingPolicy = new FKismetConnectionDrawingPolicy(WireLayerId, MaxLayerId, ZoomFactor, MyClippingRect, OutDrawElements, GraphObj);
				}
				else if (Schema->IsA(USoundCueGraphSchema::StaticClass()))
				{
					ConnectionDrawingPolicy = new FSoundCueGraphConnectionDrawingPolicy(WireLayerId, MaxLayerId, ZoomFactor, MyClippingRect, OutDrawElements, GraphObj);
				}
				else if (Schema->IsA(UMaterialGraphSchema::StaticClass()))
				{
					ConnectionDrawingPolicy = new FMaterialGraphConnectionDrawingPolicy(WireLayerId, MaxLayerId, ZoomFactor, MyClippingRect, OutDrawElements, GraphObj);
				}
				else
				{
					ConnectionDrawingPolicy = new FConnectionDrawingPolicy(WireLayerId, MaxLayerId, ZoomFactor, MyClippingRect, OutDrawElements);
				}
			}
		}

		TArray<TSharedPtr<SGraphPin>> OverridePins;
		for (const FGraphPinHandle& Handle : PreviewConnectorFromPins)
		{
			TSharedPtr<SGraphPin> Pin = Handle.FindInGraphPanel(*this);
			if (Pin.IsValid())
			{
				OverridePins.Add(Pin);
			}
		}
		ConnectionDrawingPolicy->SetHoveredPins(CurrentHoveredPins, OverridePins, TimeSinceMouseEnteredPin);
		ConnectionDrawingPolicy->SetMarkedPin(MarkedPin);

		// Get the set of pins for all children and synthesize geometry for culled out pins so lines can be drawn to them.
		TMap<TSharedRef<SWidget>, FArrangedWidget> PinGeometries;
		TSet< TSharedRef<SWidget> > VisiblePins;
		for (int32 ChildIndex = 0; ChildIndex < Children.Num(); ++ChildIndex)
		{
			TSharedRef<SGraphNode> ChildNode = StaticCastSharedRef<SGraphNode>(Children[ChildIndex]);

			// If this is a culled node, approximate the pin geometry to the corner of the node it is within
			if (IsNodeCulled(ChildNode, AllottedGeometry))
			{
				TArray< TSharedRef<SWidget> > NodePins;
				ChildNode->GetPins(NodePins);

				const FVector2D NodeLoc = ChildNode->GetPosition();
				const FGeometry SynthesizedNodeGeometry(GraphCoordToPanelCoord(NodeLoc), AllottedGeometry.AbsolutePosition, FVector2D::ZeroVector, 1.f);

				for (TArray< TSharedRef<SWidget> >::TConstIterator NodePinIterator(NodePins); NodePinIterator; ++NodePinIterator)
				{
					const SGraphPin& PinWidget = static_cast<const SGraphPin&>((*NodePinIterator).Get());
					FVector2D PinLoc = NodeLoc + PinWidget.GetNodeOffset();

					const FGeometry SynthesizedPinGeometry(GraphCoordToPanelCoord(PinLoc), AllottedGeometry.AbsolutePosition, FVector2D::ZeroVector, 1.f);
					PinGeometries.Add(*NodePinIterator, FArrangedWidget(*NodePinIterator, SynthesizedPinGeometry));
				}

				// Also add synthesized geometries for culled nodes
				ArrangedChildren.AddWidget( FArrangedWidget(ChildNode, SynthesizedNodeGeometry) );
			}
			else
			{
				ChildNode->GetPins(VisiblePins);
			}
		}

		// Now get the pin geometry for all visible children and append it to the PinGeometries map
		TMap<TSharedRef<SWidget>, FArrangedWidget> VisiblePinGeometries;
		{
			this->FindChildGeometries(AllottedGeometry, VisiblePins, VisiblePinGeometries);
			PinGeometries.Append(VisiblePinGeometries);
		}

		// Draw preview connections (only connected on one end)
		if (PreviewConnectorFromPins.Num() > 0)
		{
			for (const FGraphPinHandle& Handle : PreviewConnectorFromPins)
			{
				TSharedPtr< SGraphPin > CurrentStartPin = Handle.FindInGraphPanel(*this);
				if (!CurrentStartPin.IsValid())
				{
					continue;
				}
				const FArrangedWidget* PinGeometry = PinGeometries.Find( CurrentStartPin.ToSharedRef() );

				if (PinGeometry != NULL)
				{
					FVector2D StartPoint;
					FVector2D EndPoint;

					if (CurrentStartPin->GetDirection() == EGPD_Input)
					{
						StartPoint = AllottedGeometry.AbsolutePosition + PreviewConnectorEndpoint;
						EndPoint = FGeometryHelper::VerticalMiddleLeftOf( PinGeometry->Geometry ) - FVector2D(ConnectionDrawingPolicy->ArrowRadius.X, 0);
					}
					else
					{
						StartPoint = FGeometryHelper::VerticalMiddleRightOf( PinGeometry->Geometry );
						EndPoint = AllottedGeometry.AbsolutePosition + PreviewConnectorEndpoint;
					}

					ConnectionDrawingPolicy->DrawPreviewConnector(PinGeometry->Geometry, StartPoint, EndPoint, CurrentStartPin.Get()->GetPinObj());
				}

				//@TODO: Re-evaluate this incompatible mojo; it's mutating every pin state every frame to accomplish a visual effect
				ConnectionDrawingPolicy->SetIncompatiblePinDrawState(CurrentStartPin, VisiblePins);
			}
		}
		else
		{
			//@TODO: Re-evaluate this incompatible mojo; it's mutating every pin state every frame to accomplish a visual effect
			ConnectionDrawingPolicy->ResetIncompatiblePinDrawState(VisiblePins);
		}

		// Draw all regular connections
		ConnectionDrawingPolicy->Draw(PinGeometries, ArrangedChildren);

		delete ConnectionDrawingPolicy;
	}

	// Draw a shadow overlay around the edges of the graph
	++MaxLayerId;
	PaintSurroundSunkenShadow(FEditorStyle::GetBrush(TEXT("Graph.Shadow")), AllottedGeometry, MyClippingRect, OutDrawElements, MaxLayerId);

	if(ShowGraphStateOverlay.Get())
	{
		const FSlateBrush* BorderBrush = nullptr;
		if((GEditor->bIsSimulatingInEditor || GEditor->PlayWorld != NULL))
		{
			// Draw a surrounding indicator when PIE is active, to make it clear that the graph is read-only, etc...
			BorderBrush = FEditorStyle::GetBrush(TEXT("Graph.PlayInEditor"));
		}
		else if(!IsEditable.Get())
		{
			// Draw a different border when we're not simulating but the graph is read-only
			BorderBrush = FEditorStyle::GetBrush(TEXT("Graph.ReadOnlyBorder"));
		}

		if(BorderBrush)
		{
			// Actually draw the border
			FSlateDrawElement::MakeBox(
				OutDrawElements,
				MaxLayerId,
				AllottedGeometry.ToPaintGeometry(),
				BorderBrush,
				MyClippingRect
				);
		}
	}

	// Draw the marquee selection rectangle
	PaintMarquee(AllottedGeometry, MyClippingRect, OutDrawElements, MaxLayerId);

	// Draw the software cursor
	++MaxLayerId;
	PaintSoftwareCursor(AllottedGeometry, MyClippingRect, OutDrawElements, MaxLayerId);

	return MaxLayerId;
}
int32 SWidget::Paint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const
{
	INC_DWORD_STAT(STAT_SlateNumPaintedWidgets);
	SLATE_CYCLE_COUNTER_SCOPE_CUSTOM_DETAILED(SLATE_STATS_DETAIL_LEVEL_MED, GSlateOnPaint, GetType());

	// Save the current layout cache we're associated with (if any)
	LayoutCache = Args.GetLayoutCache();

	// Record if we're part of a volatility pass, this is critical for ensuring we don't report a child
	// of a volatile widget as non-volatile, causing the invalidation panel to do work that's not required.
	bInheritedVolatility = Args.IsVolatilityPass();

	// If this paint pass is to cache off our geometry, but we're a volatile widget,
	// record this widget as volatile in the draw elements so that we get our own tick/paint 
	// pass later when the layout cache draws.
	if ( Args.IsCaching() && IsVolatile() )
	{
		const int32 VolatileLayerId = LayerId + 1;
		OutDrawElements.QueueVolatilePainting(
			FSlateWindowElementList::FVolatilePaint(SharedThis(this), Args, AllottedGeometry, MyClippingRect, VolatileLayerId, InWidgetStyle, bParentEnabled));

		return VolatileLayerId;
	}

	if ( bFoldTick && bCanTick )
	{
		FGeometry TickGeometry = AllottedGeometry;
		TickGeometry.AppendTransform( FSlateLayoutTransform(Args.GetWindowToDesktopTransform()) );

		SWidget* MutableThis = const_cast<SWidget*>(this);
		MutableThis->ExecuteActiveTimers( Args.GetCurrentTime(), Args.GetDeltaTime() );
		MutableThis->Tick( TickGeometry, Args.GetCurrentTime(), Args.GetDeltaTime() );
	}

	// Record hit test geometry, but only if we're not caching.
	const FPaintArgs UpdatedArgs = Args.RecordHittestGeometry(this, AllottedGeometry, MyClippingRect);

	// Paint the geometry of this widget.
	int32 NewLayerID = OnPaint(UpdatedArgs, AllottedGeometry, MyClippingRect, OutDrawElements, LayerId, InWidgetStyle, bParentEnabled);

	// Check if we need to show the keyboard focus ring, this is only necessary if the widget could be focused.
	if ( bCanSupportFocus && SupportsKeyboardFocus() )
	{
		bool bShowUserFocus = FSlateApplicationBase::Get().ShowUserFocus(SharedThis(this));
		if (bShowUserFocus)
		{
			const FSlateBrush* BrushResource = GetFocusBrush();

			if (BrushResource != nullptr)
			{
				FSlateDrawElement::MakeBox(
					OutDrawElements,
					NewLayerID,
					AllottedGeometry.ToPaintGeometry(),
					BrushResource,
					MyClippingRect,
					ESlateDrawEffect::None,
					BrushResource->GetTint(InWidgetStyle)
					);
			}
		}
	}

	return NewLayerID;
}
Beispiel #17
0
	/**  SWidget interface */
	virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const override
	{
		// First paint the background
		{
			LayerId = PaintBackground(AllottedGeometry, MyClippingRect, OutDrawElements, LayerId);
			LayerId++;
		}

		FArrangedChildren ArrangedChildren(EVisibility::Visible);
		ArrangeChildren(AllottedGeometry, ArrangedChildren);

		// Draw the child nodes

		// When drawing a marquee, need a preview of what the selection will be.
		const auto* SelectionToVisualize = &(SelectionManager.SelectedNodes);
		FGraphPanelSelectionSet SelectionPreview;
		if (Marquee.IsValid())
		{			
			ApplyMarqueeSelection(Marquee, SelectionManager.SelectedNodes, SelectionPreview);
			SelectionToVisualize = &SelectionPreview;
		}
	
		int32 NodesLayerId = LayerId;

		for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
		{
			FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
			TSharedRef<SWorldTileItem> ChildNode = StaticCastSharedRef<SWorldTileItem>(CurWidget.Widget);
		
			ChildNode->bAffectedByMarquee = SelectionToVisualize->Contains(ChildNode->GetObjectBeingDisplayed());
			LayerId = CurWidget.Widget->Paint(Args.WithNewParent(this), CurWidget.Geometry, MyClippingRect, OutDrawElements, NodesLayerId, InWidgetStyle, ShouldBeEnabled(bParentEnabled));
			ChildNode->bAffectedByMarquee = false;
		}
		
		// Draw editable world bounds
		if (!WorldModel->IsSimulating())
		{
			float ScreenSpaceSize = FLevelCollectionModel::EditableAxisLength()*GetZoomAmount()*2.f;
			FVector2D PaintSize = FVector2D(ScreenSpaceSize, ScreenSpaceSize);
			FVector2D PaintPosition = GraphCoordToPanelCoord(FVector2D::ZeroVector) - (PaintSize*0.5f);
			float Scale = 0.2f; // Scale down drawing border
			FSlateLayoutTransform LayoutTransform(Scale, AllottedGeometry.GetAccumulatedLayoutTransform().GetTranslation() + PaintPosition);
			FSlateRenderTransform RenderTransform(Scale, AllottedGeometry.GetAccumulatedRenderTransform().GetTranslation() + PaintPosition);
			FPaintGeometry EditableArea(LayoutTransform, RenderTransform, PaintSize/Scale);

			FLinearColor PaintColor = FLinearColor::Yellow;
			PaintColor.A = 0.4f;

			FSlateDrawElement::MakeBox(
				OutDrawElements,
				++LayerId,
				EditableArea,
				FEditorStyle::GetBrush(TEXT("Graph.CompactNode.ShadowSelected")),
				MyClippingRect,
				ESlateDrawEffect::None,
				PaintColor
				);
		}
		
		// Draw the marquee selection rectangle
		PaintMarquee(AllottedGeometry, MyClippingRect, OutDrawElements, ++LayerId);

		// Draw the software cursor
		PaintSoftwareCursor(AllottedGeometry, MyClippingRect, OutDrawElements, ++LayerId);

		if(WorldModel->IsSimulating())
		{
			// Draw a surrounding indicator when PIE is active, to make it clear that the graph is read-only, etc...
			FSlateDrawElement::MakeBox(
				OutDrawElements,
				LayerId,
				AllottedGeometry.ToPaintGeometry(),
				FEditorStyle::GetBrush(TEXT("Graph.PlayInEditor")),
				MyClippingRect
				);
		}

		// Draw observer location
		{
			FVector ObserverPosition;
			FRotator ObserverRotation;
			if (WorldModel->GetObserverView(ObserverPosition, ObserverRotation))
			{
				FVector2D ObserverPositionScreen = GraphCoordToPanelCoord(FVector2D(ObserverPosition.X, ObserverPosition.Y));
				const FSlateBrush* CameraImage = FEditorStyle::GetBrush(TEXT("WorldBrowser.SimulationViewPositon"));
	
				FPaintGeometry PaintGeometry = AllottedGeometry.ToPaintGeometry(
					ObserverPositionScreen - CameraImage->ImageSize*0.5f, 
					CameraImage->ImageSize
					);

				FSlateDrawElement::MakeRotatedBox(
					OutDrawElements,
					++LayerId,
					PaintGeometry,
					CameraImage,
					MyClippingRect,
					ESlateDrawEffect::None,
					FMath::DegreesToRadians(ObserverRotation.Yaw),
					CameraImage->ImageSize*0.5f,
					FSlateDrawElement::RelativeToElement
					);
			}

			FVector PlayerPosition;
			FRotator PlayerRotation;
			if (WorldModel->GetPlayerView(PlayerPosition, PlayerRotation))
			{
				FVector2D PlayerPositionScreen = GraphCoordToPanelCoord(FVector2D(PlayerPosition.X, PlayerPosition.Y));
				const FSlateBrush* CameraImage = FEditorStyle::GetBrush(TEXT("WorldBrowser.SimulationViewPositon"));
	
				FPaintGeometry PaintGeometry = AllottedGeometry.ToPaintGeometry(
					PlayerPositionScreen - CameraImage->ImageSize*0.5f, 
					CameraImage->ImageSize
					);

				FSlateDrawElement::MakeRotatedBox(
					OutDrawElements,
					++LayerId,
					PaintGeometry,
					CameraImage,
					MyClippingRect,
					ESlateDrawEffect::None,
					FMath::DegreesToRadians(PlayerRotation.Yaw),
					CameraImage->ImageSize*0.5f,
					FSlateDrawElement::RelativeToElement,
					FLinearColor(FColorList::Orange)
					);
			}

		}

		LayerId = PaintScaleRuler(AllottedGeometry, MyClippingRect, OutDrawElements, LayerId);
		return LayerId;
	}