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32 lines
960 B
32 lines
960 B
using System;
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using System.Collections.Generic;
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/// <summary>
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/// This interface defines an action observer. It implements a generic observer pattern and can be reused,
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/// but its main usage in this project is to make the view update whenever the shop model changes.
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/// </summary>
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public interface IShopModelObserver<T>
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{
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void OnSelected(T item);
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void OnRemoved(T item);
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void OnAdded(T item);
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}
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// Unsubscriber, so the observer can self-unsubscribe from this observable without any coupling
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public class Unsubscriber<T> : IDisposable
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{
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private List<IShopModelObserver<T>> _observers;
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private IShopModelObserver<T> _observer;
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internal Unsubscriber(List<IShopModelObserver<T>> observers, IShopModelObserver<T> observer)
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{
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this._observers = observers;
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this._observer = observer;
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}
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public void Dispose()
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{
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if (_observers.Contains(_observer))
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_observers.Remove(_observer);
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}
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}
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