EmptyWidget

Available in backends: qt, ipynb

Signals

• changed(object) - Emitted when the widget value changes.
• label_changed(str) - Emitted when the widget label changes.
• native_parent_changed(object) - Emitted with the backend widget when the widget parent changes.

EmptyWidget

Bases: ValueWidget

A base widget with no value.

This widget is primarily here to serve as a "hidden widget" to which a value or callback can be bound.

Parameters:

• value (Any, default: Undefined ) –

  The starting value for the widget.

• bind (Callable[[ValueWidget], Any] | Any, default: Undefined ) –

  A value or callback to bind this widget. If provided, whenever widget.value is accessed, the value provided here will be returned instead. bind may be a callable, in which case bind(self) will be returned (i.e. your bound callback must accept a single parameter, which is this widget instance).

• nullable (bool, default: False ) –

  If True, the widget will accepts None as a valid value, by default False.

• **base_widget_kwargs (Any, default: {} ) –

  All additional keyword arguments are passed to the base magicgui.widgets.Widget constructor.

value: Any property writable

Look for a bound value, otherwise fallback to get_value.

__repr__() -> str

Return string repr (avoid looking for value).

get_value() -> Any

Return value if one has been manually set... otherwise return Param.empty.