/// <summary>
/// Detaches the event source.
/// </summary>
/// <param name="item">The item to detach.</param>
protected void DetachEventSource([NotNull] INotifyPropertyChanged item)
{
var sourceType = item.GetType();
if (EventSources.TryGetValue(sourceType, out var oldListern))
{
oldListern?.Detach();
EventSources.Remove(sourceType);
}
}
/// <summary>
/// Detaches the event source.
/// </summary>
/// <param name="item">The item to detach.</param>
protected void DetachEventSource([NotNull] INotifyPropertyChanged item)
{
var sourceType = item.GetType();
if (EventSources.TryGetValue(sourceType, out var oldListener) && oldListener.TryGetTarget(out var target))
{
target.PropertyChanged -= RelaySource_PropertyChanged;
EventSources.Remove(sourceType);
}
}
/// <summary>
/// Relays the property changed events of the source object.
/// The properties to relay must be declared with the <see cref="RelayedEventAttribute"/>.
/// </summary>
/// <param name="source">The source.</param>
protected void RelayEventsOf([NotNull] INotifyPropertyChanged source)
{
Contract.Requires(source != null);
var sourceType = source.GetType();
if (RelayMapping.Keys.All(key => key?.IsAssignableFrom(sourceType) != true))
throw new InvalidOperationException(@"This class has no property with a RelayedEventAttribute for the type " + sourceType);
INotifyPropertyChanged oldSource;
if (EventSources.TryGetValue(sourceType, out oldSource) && (oldSource != null))
oldSource.PropertyChanged -= RelaySource_PropertyChanged;
source.PropertyChanged += RelaySource_PropertyChanged;
EventSources[sourceType] = source;
}
/// <summary>
/// Relays the property changed events of the source object.
/// The properties to relay must be declared with the <see cref="RelayedEventAttribute"/>.
/// </summary>
/// <param name="source">The source.</param>
protected void RelayEventsOf([NotNull] INotifyPropertyChanged source)
{
var sourceType = source.GetType();
if (RelayMapping.Keys.All(key => key?.IsAssignableFrom(sourceType) != true))
{
throw new InvalidOperationException(@"This class has no property with a RelayedEventAttribute for the type " + sourceType);
}
if (EventSources.TryGetValue(sourceType, out var oldListern))
{
oldListern?.Detach();
}
var newListener = new WeakEventListener(this, source, OnWeakEvent, OnAttach, OnDetach);
EventSources[sourceType] = newListener;
}
/// <summary>
/// Relays the property changed events of the source object.
/// The properties to relay must be declared with the <see cref="RelayedEventAttribute"/>.
/// </summary>
/// <param name="source">The source.</param>
protected void RelayEventsOf([NotNull] INotifyPropertyChanged source)
{
var sourceType = source.GetType();
if (RelayMapping.Keys.All(key => key?.IsAssignableFrom(sourceType) != true))
{
throw new InvalidOperationException(@"This class has no property with a RelayedEventAttribute for the type " + sourceType);
}
if (EventSources.TryGetValue(sourceType, out var oldListener) && oldListener.TryGetTarget(out var oldTarget))
{
oldTarget.PropertyChanged -= RelaySource_PropertyChanged;
}
source.PropertyChanged += RelaySource_PropertyChanged;
EventSources[sourceType] = new WeakReference <INotifyPropertyChanged>(source);
}