nodedge.edge

Edge module containing Edge and EdgeType class.

class nodedge.edge.EdgeType

Bases: enum.IntEnum

Edge Type Constants

STRAIGHT = 1
BEZIER = 2
CIRCUIT = 3
class nodedge.edge.Edge(scene: Scene, startSocket: Optional[nodedge.connector.Socket] = None, endSocket: Optional[nodedge.connector.Socket] = None, edgeType: nodedge.edge.EdgeType = <EdgeType.CIRCUIT: 3>)

Bases: nodedge.serializable.Serializable

Edge class.

The edge is the component connecting two Node s.

[NODE 1]——EDGE——[NODE 2]

Parameters

  • scene (Scene) – Reference to the scene

  • startSocket (Socket) – Reference to the starting socket

  • endSocket (Socket | None) – Reference to the End socket or None

  • edgeType (EdgeType) – Constant determining type of edge.

Instance Attributes

  • scene - reference to the Scene

  • graphicsEdge

  • Instance of GraphicsEdge subclass

    handling graphical representation in the QGraphicsScene.

edgeValidators: List[Callable] = []

class variable containing list of

property sourceSocket

Source socket.

Getter

Return source Socket.

Setter

Set source Socket safely.

Type

Socket

property targetSocket

Target socket

Getter

Return target Socket or None if not set.

Setter

Set target Socket safely.

Type

Socket or None

property edgeType

Edge type

Getter

Get edge type constant for current Edge.

Setter

Set new edge type. On background, create new GraphicsEdge child class if necessary, add this QGraphicsPathItem to the QGraphicsScene and update edge sockets positions.

Type

EdgeType

property isSelected

Property defining whether the edge is selected or not.

Getter

Get selection state of the edge.

Setter

Provide the safe selecting/deselecting operation. In the background it takes care about the flags, notifications and storing history for undo/redo.

Type

bool

updatePos() → None

Update the internal GraphicsEdge positions according to the start and end Socket

getOtherSocket(knownSocket: Optional[Socket])

Return the opposite Socket on this Edge.

Parameters

knownSocket (Socket) – Provide known Socket to be able to determine the opposite one

Returns

The opposite socket on this Edge, eventually None.

Return type

Socket or None

removeFromSockets() → None

Set start and end Socket to None

remove(silentForSocket: Optional[nodedge.connector.Socket] = None, silent: bool = False)

Safely remove this Edge.

Remove GraphicsEdge from the QGraphicsScene and it’s reference to all other graphical elements. Notify previously connected Node (s) about this event.

Triggered Node Slots: - onEdgeConnectionChanged() - onInputChanged()

Parameters

  • silentForSocket (Optional[Socket]) – Socket for whom the removal is silent

  • silent (bool) – True if no events should be triggered during removing

classmethod getEdgeValidators()

Return the list of Edge Validator Callbacks

classmethod registerEdgeValidator(validatorCallback: Callable)

Register Edge Validator Callback

Parameters

validatorCallback (function) – A function handle to validate Edge

classmethod validateEdge(startSocket: nodedge.connector.Socket, endSocket: nodedge.connector.Socket) → bool

Validate Edge against all registered Edge Validator Callbacks

Parameters

  • startSocket (Socket) – Starting Socket of Edge to check

  • endSocket (Socket) – Target/End Socket of Edge to check

Returns

True if the Edge is valid, False otherwise

Return type

bool

reconnect(sourceSocket: nodedge.connector.Socket, targetSocket: nodedge.connector.Socket)

Helper function which reconnects edge sourceSocket to targetSocket

serialize() → collections.OrderedDict

Serialization method.

Returns

Serialized edge

Return type

OrderedDict

deserialize(data: dict, hashmap: Optional[dict] = None, restoreId: bool = True, *args, **kwargs) → bool

Deserialization method.

Parameters

  • data (dict) –

  • hashmap (Optional[dict]) –

  • restoreId (bool) –

Returns

success status

Return type

bool