public static IDisposable ProcessEach <T>(this IObservableCollection <T> self, Action <T> func, Action <T> onRemove = null)
{
foreach (var item in self)
{
func(item);
}
var finalDisp = new ListDisposable();
var collection = new Collection <T>();
finalDisp.Add(self.ObserveReset().Listen(unit =>
{
if (onRemove != null)
{
foreach (var element in collection)
{
onRemove(element);
}
}
collection.Clear();
}));
finalDisp.Add(self.ObserveAdd().Listen(add =>
{
func(add.Value);
collection.Add(add.Value);
}));
finalDisp.Add(self.ObserveReplace().Listen(replaceEvent =>
{
collection.Add(replaceEvent.NewValue);
collection.Remove(replaceEvent.OldValue);
func(replaceEvent.NewValue);
if (onRemove != null)
{
onRemove(replaceEvent.OldValue);
}
}));
if (onRemove != null)
{
finalDisp.Add(self.ObserveRemove().Listen(remove =>
{
onRemove(remove.Value);
collection.Remove(remove.Value);
}));
}
return(finalDisp);
}
