/// <summary>
/// Binds an action to a specific property.
/// </summary>
/// <param name="propertyName">The property to bind against</param>
/// <param name="action">The action to be called</param>
public void Bind(string propertyName, EventHandler <EventArgs> action)
{
if (!ValidatePublicPropertyNames(CallerType, propertyName))
{
throw new ArgumentException("Invalid property name");
}
Delegate list;
if (!_links.TryGetValue(propertyName, out list))
{
_links[propertyName] =
WeakReferenceEventHandler.MakeWeakHandler(
action,
rem =>
{
var handler = (EventHandler <EventArgs>)_links[propertyName];
handler -= rem;
});
}
else
{
_links[propertyName] = (EventHandler <EventArgs>)list +
WeakReferenceEventHandler.MakeWeakHandler(
action,
rem =>
{
var handler = (EventHandler <EventArgs>)_links[propertyName];
handler -= rem;
});
}
}
/// <summary>
/// Creates an instance
/// </summary>
/// <param name="source">The source collection</param>
/// <param name="filter">The filter delegate</param>
public FilteredReadOnlyObservableCollection(ObservableCollection <Type> source, Func <Type, bool> filter)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (filter == null)
{
throw new ArgumentNullException("filter");
}
_ignoreSourceChangeEvents = false;
Source = source;
_filter = filter;
_handler = WeakReferenceEventHandler.MakeWeakPropertyChangedHandler(Handler, (item, rem) => { item.PropertyChanged -= rem; });
Filtered = new ObservableCollection <Type>(source.Where(filter));
source.CollectionChanged += source_CollectionChanged;
Filtered.CollectionChanged += filtered_CollectionChanged;
foreach (var item in Source)
{
if (item is INotifyPropertyChanged)
{
((INotifyPropertyChanged)item).PropertyChanged += _handler;
}
}
}
