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34 lines
1.2 KiB
Plaintext
34 lines
1.2 KiB
Plaintext
# The model implements the observer pattern. This means that the class must
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# support adding, removing, and alerting observers. In this case, the model is
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# completely independent of controllers and views. It is important that all
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# registered observers implement a specific method that will be called by the
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# model when they are notified (in this case, it is the `model_is_changed`
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# method). For this, observers must be descendants of an abstract class,
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# inheriting which, the `model_is_changed` method must be overridden.
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class BaseScreenModel:
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"""Implements a base class for model modules."""
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_observers = []
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def add_observer(self, observer) -> None:
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self._observers.append(observer)
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def remove_observer(self, observer) -> None:
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self._observers.remove(observer)
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def notify_observers(self, name_screen: str) -> None:
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"""
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Method that will be called by the observer when the model data changes.
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:param name_screen:
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name of the view for which the method should be called
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:meth:`model_is_changed`.
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"""
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for observer in self._observers:
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if observer.name == name_screen:
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observer.model_is_changed()
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break
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