/// <summary>
/// Removes from the <see cref="PropertyObserver"/> subscriptions associated with the specified source object.
/// </summary>
/// <typeparam name="T">The type of the source object.</typeparam>
/// <param name="source">The source object to unobserve.</param>
public void Unobserve <T>(T source) where T : class, INotifyPropertyChanged
{
Requires.NotNull(source, nameof(source));
CheckDisposed();
lock (table)
{
if (table.TryGetValue(source, out Subscriber subscriber))
{
subscriber.Dispose();
PropertyChangedEvent.RemoveListener(source, subscriber);
table.Remove(source);
}
}
}
/// <summary>
/// Releases resources used by the <see cref="PropertyObserver"/>.
/// </summary>
/// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool disposing)
{
if (disposing && ValueSafe.Increment0(ref disposed))
{
lock (table)
{
foreach (KeyValuePair <INotifyPropertyChanged, Subscriber> pair in table)
{
Subscriber subscriber = pair.Value;
subscriber.Dispose();
PropertyChangedEvent.RemoveListener(pair.Key, subscriber);
}
table.Clear();
}
}
}
/// <summary>
/// Unsubscribes the specified delegate from the change notification of any property of the specified source object.
/// </summary>
/// <typeparam name="T">The type of the source object.</typeparam>
/// <param name="source">The source object to unsubscribe from.</param>
/// <param name="callback">The delegate to unsubscribe.</param>
private void Unsubscribe <T>(T source, Action callback) where T : class, INotifyPropertyChanged
{
CheckDisposed();
lock (table)
{
if (table.TryGetValue(source, out Subscriber subscriber))
{
subscriber.Unsubscribe <T>(callback);
if (subscriber.IsEmpty)
{
subscriber.Dispose();
PropertyChangedEvent.RemoveListener(source, subscriber);
table.Remove(source);
}
}
}
}
