Workflow Events (events)

class orangecanvas.scheme.events.WorkflowEvent

Bases: PyQt5.QtCore.QEvent

NodeAdded = QEvent.Type(...)

Delivered to Scheme when a node has been added (NodeEvent)

NodeRemoved = QEvent.Type(...)

Delivered to Scheme when a node has been removed (NodeEvent)

LinkAdded = QEvent.Type(...)

A Link has been added to the scheme (LinkEvent)

LinkRemoved = QEvent.Type(...)

A Link has been removed from the scheme (LinkEvent)

InputLinkAdded = QEvent.Type(...)

An input Link has been added to a node (LinkEvent)

OutputLinkAdded = QEvent.Type(...)

An output Link has been added to a node (LinkEvent)

InputLinkRemoved = QEvent.Type(...)

An input Link has been removed from a node (LinkEvent)

OutputLinkRemoved = QEvent.Type(...)

An output Link has been removed from a node (LinkEvent)

NodeStateChange = QEvent.Type(...)

Node’s (runtime) state has changed (NodeEvent)

LinkStateChange = QEvent.Type(...)

Link’s (runtime) state has changed (LinkEvent)

InputLinkStateChange = QEvent.Type(...)

Input link’s (runtime) state has changed (LinkEvent)

OutputLinkStateChange = QEvent.Type(...)

Output link’s (runtime) state has changed (LinkEvent)

NodeActivateRequest = QEvent.Type(...)

Node user activate request (e.g. on double click in the canvas GUI)

WorkflowResourceChange = QEvent.Type(...)

Workflow resource changed (e.g. work directory, env variable)

AnnotationAdded = QEvent.Type(...)

AnnotationRemoved = QEvent.Type(...)

AnnotationChange = QEvent.Type(...)

ActivateParentRequest = QEvent.Type(...)

Request activation (show and raise) of the window containing the workflow view

class orangecanvas.scheme.events.NodeEvent(etype, node)

Bases: orangecanvas.scheme.events.WorkflowEvent

An event notifying the receiver of an workflow link change.

This event is used with:

• WorkflowEvent.NodeAdded
• WorkflowEvent.NodeRemoved
• WorkflowEvent.NodeStateChange
• WorkflowEvent.NodeActivateRequest
• WorkflowEvent.ActivateParentRequest
• WorkflowEvent.OutputLinkRemoved

Parameters:

• etype (QEvent.Type) –
• node (SchemeNode) –

node() → SchemeNode

Returns:node – The node instance. Return type:SchemeNode

class orangecanvas.scheme.events.LinkEvent(etype, link)

Bases: orangecanvas.scheme.events.WorkflowEvent

An event notifying the receiver of an workflow link change.

This event is used with:

• WorkflowEvent.LinkAdded
• WorkflowEvent.LinkRemoved
• WorkflowEvent.InputLinkAdded
• WorkflowEvent.InputLinkRemoved
• WorkflowEvent.OutputLinkAdded
• WorkflowEvent.OutputLinkRemoved
• WorkflowEvent.InputLinkStateChange
• WorkflowEvent.OutputLinkStateChange

Parameters:

• etype (QEvent.Type) –
• link (SchemeLink) – The link subject to change

link() → SchemeLink

Returns:link – The link instance. Return type:SchemeLink

class orangecanvas.scheme.events.AnnotationEvent(etype, annotation)

Bases: orangecanvas.scheme.events.WorkflowEvent

An event notifying the receiver of an workflow annotation changes

This event is used with:

• WorkflowEvent.AnnotationAdded
• WorkflowEvent.AnnotationRemoved

Parameters:

• etype (QEvent.Type) –
• annotation (BaseSchemeAnnotation) – The annotation that is a subject of change.

annotation() → BaseSchemeAnnotation

Returns:annotation – The annotation instance. Return type:BaseSchemeAnnotation

class orangecanvas.scheme.events.WorkflowEnvChanged(name, newValue, oldValue)

Bases: orangecanvas.scheme.events.WorkflowEvent

An event notifying the receiver of a workflow environment change.

Parameters:

• name (str) – The name of the environment property that was changed
• newValue (Any) – The new value
• oldValue (Any) – The old value

See also

Scheme.runtime_env

name() → str

The name of the environment property.

oldValue() → Any

The old value.

newValue() → Any

The new value.