known subclasses: kiwi.interfaces.IValidatableProxyWidget
IProxyWidget is a widget that can be attached to a proxy.
Signals:content-changed: This must be emitted when the content changesProperties:
data-type: string, data type of the model model-attribute: string, name of the attribute in the model
Function | read | Reads the content of the widget and returns in an appropriate
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Function | update | Updates the content of the widget with a value
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