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orange-widget-base

library4.27.0pypypiunverified

Base classes for creating Orange Canvas widgets. Provides OWBaseWidget and its derived classes for building interactive data mining components. Current version 4.27.0, requires Python >=3.10. Released as part of the Orange data mining suite.

data web-framework

pip install orange-widget-base

package ↗homepage ↗

INSTALL

IMPORT

SIG · ORANGE-WIDGET-BASE

orange-widget-base

datapythonv4.27.0

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

OWBaseWidget

✓ from orangewidget.widget import OWBaseWidget

✗ from orangewidget.widget import OWBaseWidget

Minimal OWBaseWidget subclass with inputs, outputs, settings, and control area.

from orangewidget.widget import OWBaseWidget, Input, Output from orangewidget import gui from orangewidget.settings import Setting class MyWidget(OWBaseWidget): name = "My Widget" description = "A custom widget" icon = "icons/my.svg" priority = 10 class Inputs: data = Input("Data", object, "set_data") class Outputs: result = Output("Result", object) settings = {"threshold": Setting(0.5)} want_main_area = False def __init__(self): super().__init__() self.threshold = 0.5 gui.doubleSpin(self.controlArea, self, "threshold", 0, 1, 0.1, label="Threshold:") def set_data(self, data): pass if __name__ == "__main__": from orangewidget.utils.widgetpreview import WidgetPreview WidgetPreview(MyWidget).run()

Debug

Known issues

breakingIn version 4.x, the signal handling API changed from connect/disconnect style to decorator-based Input/Output classes. Old code using `self.inputs = [...]` or `self.outputs = [...]` will break.

fix

Define Inputs and Outputs as inner classes with Input/Output instances.

affects: >=4.0.0

breakingThe `gui` module was removed from `Orange.widgets` and moved to the separate `orangewidget` package. Importing from `Orange.widgets.gui` will raise ImportError.

fix

Use `from orangewidget import gui` instead.

affects: >=4.0.0

breakingThe `Orange.widgets.settings` module moved to `orangewidget.settings`. The `Setting` class import path changed.

fix

Import from `orangewidget.settings import Setting`.

affects: >=4.0.0

breakingThe `orange-canvas-core` package now enforces the new widget API. Old-style widgets may not load or cause errors.

fix

Update widgets to use OWBaseWidget and Input/Output decorators.

affects: >=4.0.0

deprecatedThe use of `getattr(self, 'handler_{}'.format(signal_name))` signal handlers is deprecated in favor of explicit methods linked via `Input` decorator.

fix

Define handler methods with descriptive names and link them via `Input("Name", type, "method_name")`.

affects: >=4.0.0

gotchaThe `name` attribute of OWBaseWidget must be a non-empty string, otherwise the widget may not appear in the canvas.

fix

Always set `name` to a unique, descriptive string.

affects: all

gotchaSignals types must be actual Python objects (classes), not strings. Using strings for type will raise a TypeError at registration.

fix

Pass the class object, e.g., `Input("Data", Orange.data.Table, "set_data")`.

affects: >=4.0.0

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Version history

4.27.0latest on PyPI · released Dec 19, 2025

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Dependencies

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Agent activity

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Resources

packagehttps://pypi.org/project/orange-widget-base/ ↗

homepagehttp://orange.biolab.si/ ↗