/// <summary>
/// Subscribes to the <see cref="INotifyPropertyChanged.PropertyChanged"/> event for a particular property.
/// </summary>
/// <param name="source">The object whose property is observed. May not be <c>null</c>.</param>
/// <param name="propertyName">The name of the property to observe. May be <c>null</c> to indicate that all properties should be observed.</param>
/// <param name="handler">The callback that is called when the property has changed. May not be <c>null</c>.</param>
public PropertyChangedSubscription(INotifyPropertyChanged source, string propertyName, PropertyChangedEventHandler handler)
: base(source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (handler == null)
{
throw new ArgumentNullException(nameof(handler));
}
_threadAffinity = ThreadAffinity.BindToCurrentThread();
_propertyName = propertyName;
_handler = handler;
_subscription = SourceOnPropertyChanged;
source.PropertyChanged += _subscription;
}
/// <summary>
/// Creates a new weak-event implementation of <c>ICommand.CanExecuteChanged</c>.
/// </summary>
/// <param name="sender">The sender of the <c>ICommand.CanExecuteChanged</c> event.</param>
public WeakCanExecuteChanged(object sender)
{
_threadAffinity = ThreadAffinity.BindToCurrentThread();
_sender = sender;
}
private PropertyChangedNotificationManager()
{
_threadAffinity = ThreadAffinity.BindToCurrentThread();
}
/// <summary>
/// Creates a new explicit implementation of <c>ICommand.CanExecuteChanged</c>.
/// </summary>
/// <param name="sender">The sender of the <c>ICommand.CanExecuteChanged</c> event.</param>
public ExplicitCanExecute(object sender)
{
_canExecuteChanged = new WeakCanExecuteChanged(sender);
_threadAffinity = ThreadAffinity.BindToCurrentThread();
}