private void ResetWeakHandler(object source)
{
// Unsubscribes the previous subscription and create a new one.
this.weakHandler?.Unsubscribe();
this.weakHandler = null;
// Gets the new value.
var newValue = this.GetNotiyfPropertyChangedProperty(source);
if (newValue != null)
{
this.weakHandler = new INotifyPropertyChangedWeakEventHandler(newValue, this.OnPropertyChanged);
}
}
private void UnobserveInternal()
{
this.whenChanged = null;
this.weakHandler?.Unsubscribe();
this.weakHandler = null;
this.propertyInfo = null;
foreach (var node in this.Nodes.Where(x => x.IsObservable))
{
node.UnobserveInternal();
}
this.nodes.Clear();
}
private void ObserveInternal(INotifyPropertyChanged source, Action whenChanged)
{
this.whenChanged = whenChanged;
if (source != null)
{
// Observes this one.
this.weakHandler = source.AddWeakEventHandler(this.OnPropertyChanged);
// Observes the children.
foreach (var node in this.Nodes.Where(x => x.IsObservable))
{
node.ObserveInternal(node.GetNotiyfPropertyChangedProperty(source), whenChanged);
}
}
}
