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  3. FConnectionDrawingPolicy

FConnectionDrawingPolicy

This class draws the connections for an [UEdGraph](API\Runtime\Engine\EdGraph\UEdGraph) composed of pins and nodes.

API > API/Editor > API/Editor/GraphEditor

Inheritance Hierarchy

References

   
Module GraphEditor
Header /Engine/Source/Editor/GraphEditor/Public/ConnectionDrawingPolicy.h
Include #include "ConnectionDrawingPolicy.h"

Syntax

class FConnectionDrawingPolicy

Remarks

This class draws the connections for an UEdGraph composed of pins and nodes.

Variables

  Type Name Description
Protected variable const FSlateBrush * ArrowImage  
Protected variable int32 ArrowLayerID  
Public variable FVector2D ArrowRadius  
Protected variable const FSlateBrush * BubbleImage  
Protected variable const FSlateRect & ClippingRect  
Protected variable FSlateWindowElementList & DrawElementsList  
Protected variable float HoverDeemphasisDarkFraction  
Protected variable TSet< FEdGraphPinReference > HoveredPins  
Protected variable double LastHoverTimeEvent  
Protected variable FVector2D LocalMousePosition  
Protected variable const FSlateBrush * MidpointImage  
Public variable FVector2D MidpointRadius  
Protected variable TMap< TSharedRef< SWidget >, FArrangedWidget > * PinGeometries  
Protected variable TMap< UEdGraphPin *, TSharedPtr< SGraphPin > > PinToPinWidgetMap  
Protected variable TArray< FRelinkConnection > RelinkConnections List of currently relinked connections.
Protected variable TArray< UEdGraphNode * > SelectedGraphNodes Selected nodes in the graph panel.
Protected variable const UGraphEditorSettings * Settings  
Public variable FGraphSplineOverlapResult SplineOverlapResult  
Protected variable int32 WireLayerID  
Protected variable float ZoomFactor  

Constructors

  Type Name Description
Public function  

FConnectionDrawingPolicy ( int32 InBackLayerID,
int32 InFrontLayerID,
float InZoomFactor,
const FSlateRect& InClippingRect,
FSlateWindowElementList& InDrawElements
)

  

Destructors

  Type Name Description
Public function Virtual    

Functions

  Type Name Description
Public function Virtual void

ApplyHoverDeemphasis ( UEdGraphPin* OutputPin,
UEdGraphPin* InputPin,
float& Thickness,
FLinearColor& WireColor
)

  
Protected function Virtual void Helper function used by Draw(). Called before DrawPinGeometries to populate PinToPinWidgetMap.
Public function Virtual Const FVector2D

ComputeSplineTangent ( const FVector2D& Start,
const FVector2D& End
)

  
Public function Virtual void

DetermineLinkGeometry ( FArrangedChildren& ArrangedNodes,
TSharedRef< SWidget >& OutputPinWidget,
UEdGraphPin* OutputPin,
UEdGraphPin* InputPin,
FArrangedWidget*& StartWidgetGeometry,
FArrangedWidget*& EndWidgetGeometry
)

  
Public function Virtual void

DetermineWiringStyle ( UEdGraphPin* OutputPin,
UEdGraphPin* InputPin,
FConnectionParams& Params
)

 Give specific editor modes a chance to highlight this connection or darken non-interesting connections.
Public function Virtual void

Draw ( TMap< TSharedRef< SWidget >, FArrangedWidget >& InPinGeometries,
FArrangedChildren& ArrangedNodes
)

  
Public function Virtual void

DrawConnection ( int32 LayerId,
const FVector2D& Start,
const FVector2D& End,
const FConnectionParams& Params
)

  
Protected function Virtual void

DrawPinGeometries ( TMap< TSharedRef< SWidget >, FArrangedWidget >& InPinGeometries,
FArrangedChildren& ArrangedNodes
)

 Helper function used by Draw(). Iterates over the pin geometries, drawing connections between them.
Public function Virtual void

DrawPreviewConnector ( const FGeometry& PinGeometry,
const FVector2D& StartPoint,
const FVector2D& EndPoint,
UEdGraphPin* Pin
)

  
Public function Virtual void

DrawSplineWithArrow ( const FVector2D& StartPoint,
const FVector2D& EndPoint,
const FConnectionParams& Params
)

  
Public function Virtual void

DrawSplineWithArrow ( const FGeometry& StartGeom,
const FGeometry& EndGeom,
const FConnectionParams& Params
)

  
Public function Virtual Const bool

IsConnectionCulled ( const FArrangedWidget& StartLink,
const FArrangedWidget& EndLink
)

  
Public function Static float

MakeSplineReparamTable ( const FVector2D& P0,
const FVector2D& P0Tangent,
const FVector2D& P1,
const FVector2D& P1Tangent,
FInterpCurve< float >& OutReparamTable
)

 Util to make a 'distance->alpha' table and also return spline length
Public function Virtual void

ResetIncompatiblePinDrawState ( const TSet< TSharedRef< SWidget > >& VisiblePins
)

  
Public function void

SetHoveredPins ( const TSet< FEdGraphPinReference >& InHoveredPins,
const TArray< TSharedPtr< SGraphPin > >& OverridePins,
double HoverTime
)

 Update the drawing policy with the set of hovered pins (which can be empty)
Public function Virtual void

SetIncompatiblePinDrawState ( const TSharedPtr< SGraphPin >& StartPin,
const TSet< TSharedRef< SWidget > >& VisiblePins
)

  
Public function void

SetMarkedPin ( TWeakPtr< SGraphPin > InMarkedPin
)

 Update the drawing policy with the marked pin (which may not be valid)
Public function void

SetMousePosition ( const FVector2D& InMousePos
)

  
Public function void

SetRelinkConnections ( const TArray< FRelinkConnection >& Connections
)

 Set the list of currently relinked connections.
Public function void

SetSelectedNodes ( const TArray< UEdGraphNode* >& InSelectedNodes
)

 Set the selected nodes from the graph panel.
Public function Virtual Const bool Choose whether we want to cache the pins draw state to avoid resetting it for every tick.

Classes

  Type Name Description
Public struct FRelinkConnection Handle for a currently relinked connection.  

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