int32 SPaperEditorViewport::OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const
{
int32 MaxLayerId = SCompoundWidget::OnPaint(Args, AllottedGeometry, MyClippingRect, OutDrawElements, LayerId, InWidgetStyle, bParentEnabled);
++MaxLayerId;
PaintSoftwareCursor(AllottedGeometry, MyClippingRect, OutDrawElements, MaxLayerId);
return MaxLayerId;
}
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;
}
/** 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;
}