Scheme Node (node
)¶
Scheme Node¶
-
class
orangecanvas.scheme.node.
SchemeNode
(description, title=None, position=None, properties=None, parent=None)[source]¶ Bases:
PyQt5.QtCore.QObject
A node in a
Scheme
.- Parameters
description (
WidgetDescription
) – Node description instance.title (str, optional) – Node title string (if None description.name is used).
position (tuple) – (x, y) tuple of floats for node position in a visual display.
properties (dict) – Additional extra instance properties (settings, widget geometry, …)
parent (
QObject
) – Parent object.
-
title_changed
(title)¶ The title of the node has changed
-
position_changed
((x, y))¶ Position of the node in the scheme has changed
-
progress_changed
(progress)¶ Node’s progress value has changed.
-
processing_state_changed
(state)¶ Node’s processing state has changed.
-
class
State
(value)[source]¶ Bases:
enum.IntEnum
A workflow node’s runtime state flags
-
NoState
= 0¶ The node has no state.
-
Running
= 1¶ The node is running (i.e. executing a task).
-
Pending
= 2¶ The node has invalidated inputs. This flag is set when:
An input link is added or removed
An input link is marked as pending
It is set/cleared by the execution manager when the inputs are propagated to the node.
-
Invalidated
= 4¶ The node has invalidated outputs. Execution manager should not propagate this node’s existing outputs to dependent nodes until this flag is cleared.
-
NotReady
= 8¶ The node is in a state where it does not accept new signals. The execution manager should not propagate inputs to this node until this flag is cleared.
-
-
input_channel
(name)[source]¶ Return the input channel matching name. Raise a ValueError if not found.
-
output_channel
(name)[source]¶ Return the output channel matching name. Raise an ValueError if not found.
-
status_message_changed
¶ The node’s status tip has changes
-
state_message_changed
¶ The node’s state message has changed
-
clear_state_message
(message_id)[source]¶ Clear (remove) a message with message_id.
state_message_changed
signal will be emitted with a empty message for the message_id.
-
state_message
(message_id)[source]¶ Return a message with message_id or None if a message with that id does not exist.
-
set_state
(state)[source]¶ Set the node runtime state flags
- Parameters
state (SchemeNode.State) –
-
set_state_flags
(flags, on)[source]¶ Set the specified state flags on/off.
- Parameters
flags (SchemeNode.State) – Flag to modify
on (bool) – Turn the flag on or off
-
test_state_flags
(flag)[source]¶ Return True/False if the runtime state flag is set.
- Parameters
flag (SchemeNode.State) –
- Returns
val
- Return type