Scheme Link (link)

class orangecanvas.scheme.link.SchemeLink(source_node, source_channel, sink_node, sink_channel, enabled=True, properties=None, parent=None)

Bases: PyQt5.QtCore.QObject

A instantiation of a link between two SchemeNode instances in a Scheme.

Parameters:	source_node (SchemeNode) – Source node. source_channel (OutputSignal) – The source widget’s signal. sink_node (SchemeNode) – The sink node. sink_channel (InputSignal) – The sink widget’s input signal. properties (dict) – Additional link properties.

enabled_changed(enabled)

The link enabled state has changed

dynamic_enabled_changed(enabled)

The link dynamic enabled state has changed.

state_changed

Runtime link state has changed

class State

Bases: enum.IntEnum

Flags indicating the runtime state of a link

NoState = 0

The link has no associated state.

Empty = 1

A link is empty when it has no value on it

Active = 2

A link is active when the source node provides a value on output

Pending = 4

A link is pending when it’s sink node has not yet been notified of a change (note that Empty|Pending is a valid state)

source_type()

Return the type of the source channel.

sink_type()

Return the type of the sink channel.

is_dynamic()

Is this link dynamic.

set_enabled(enabled)

Enable/disable the link.

enabled

Is this link enabled.

set_dynamic_enabled(enabled)

Enable/disable the dynamic link. Has no effect if the link is not dynamic.

dynamic_enabled

Is this a dynamic link and is dynamic_enabled set to True

set_runtime_state(state)

Set the link’s runtime state.

Parameters:	state (SchemeLink.State) –

runtime_state()

Returns:	state
Return type:	SchemeLink.State

set_tool_tip(tool_tip)

Set the link tool tip.

tool_tip

Link tool tip.