internal IStrongListener ListenImpl(Action <T> handler)
{
IWeakListener innerListener = this.ListenWeakImpl(handler);
StrongListener listener = null;
listener = new StrongListener(
() =>
{
innerListener.Unlisten();
// ReSharper disable AccessToModifiedClosure
if (listener != null)
{
lock (this.KeepListenersAlive)
{
this.KeepListenersAlive.StopKeepingListenerAlive(listener);
}
}
// ReSharper restore AccessToModifiedClosure
},
innerListener);
lock (this.KeepListenersAlive)
{
this.KeepListenersAlive.KeepListenerAlive(listener);
}
return(listener);
}
public void TestMultipleUnlistenWeak()
{
StreamSink <int> s = Stream.CreateSink <int>();
List <int> @out = new List <int>();
((Action)(() =>
{
// ReSharper disable once UnusedVariable
IWeakListener l = s.ListenWeak(@out.Add);
s.Send(1);
l.Unlisten();
l.Unlisten();
s.Send(2);
l.Unlisten();
}))();
s.Send(3);
s.Send(4);
Assert.AreEqual(1, @out.Count);
}
protected override void OnSourceChanged(object oldSource, object newSource)
{
base.OnSourceChanged(oldSource, newSource);
if (Listener != null)
{
Listener.Detach();
Listener = null;
}
if (newSource is INotifyCollectionChanged)
{
Listener = new WeakCollectionChangedListener((INotifyCollectionChanged)newSource, this);
}
GetIndexer();
}
public void TestListenWeak()
{
StreamSink <int> s = Stream.CreateSink <int>();
List <int> @out = new List <int>();
((Action)(() =>
{
// ReSharper disable once UnusedVariable
IWeakListener l = s.ListenWeak(@out.Add);
s.Send(1);
s.Send(2);
}))();
GC.Collect(0, GCCollectionMode.Forced);
s.Send(3);
s.Send(4);
Assert.AreEqual(2, @out.Count);
}
internal virtual void OnItemsSourceChanged(IEnumerable oldSource, IEnumerable newSource)
{
if (CollectionListener != null)
{
CollectionListener.Detach();
CollectionListener = null;
}
if (newSource != null)
{
if (newSource is INotifyCollectionChanged)
{
CollectionListener = new WeakCollectionChangedListener(((INotifyCollectionChanged)newSource), this);
}
Items.SetIsReadOnly(true);
itemsIsDataBound = true;
Items.ClearImpl();
foreach (var v in newSource)
{
Items.AddImpl(v);
}
// Setting itemsIsDataBound to true prevents normal notifications from propagating, so do it manually here
OnItemsChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
else
{
itemsIsDataBound = false;
Items.SetIsReadOnly(false);
Items.ClearImpl();
}
// Yes this is stupid and shouldn't be here, but DRT 348 sets an empty collection as the ItemsSource
// and expects the LayoutUpdated event to be raised. This is the only way that makes sense for this
// to happen. It's all very strange.
InvalidateMeasure();
}
public static IWeakListener AppendWeak(IWeakListener listener1, IWeakListener listener2) =>
CreateWeakComposite(new[] { listener1, listener2 });
protected override void OnSourceChanged (object oldSource, object newSource)
{
base.OnSourceChanged (oldSource, newSource);
if (Listener != null) {
Listener.Detach ();
Listener = null;
}
if (newSource is INotifyCollectionChanged)
Listener = new WeakCollectionChangedListener ((INotifyCollectionChanged) newSource, this);
GetIndexer ();
}
public void AddListener(IWeakListener listener)
{
this.listeners.Add(listener);
}
internal virtual void OnItemsSourceChanged (IEnumerable oldSource, IEnumerable newSource)
{
if (CollectionListener != null) {
CollectionListener.Detach ();
CollectionListener = null;
}
if (newSource != null) {
if (newSource is INotifyCollectionChanged) {
CollectionListener = new WeakCollectionChangedListener (((INotifyCollectionChanged)newSource), this);
}
Items.SetIsReadOnly (true);
itemsIsDataBound = true;
Items.ClearImpl ();
foreach (var v in newSource)
Items.AddImpl (v);
// Setting itemsIsDataBound to true prevents normal notifications from propagating, so do it manually here
OnItemsChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction.Reset));
} else {
itemsIsDataBound = false;
Items.SetIsReadOnly (false);
Items.ClearImpl ();
}
// Yes this is stupid and shouldn't be here, but DRT 348 sets an empty collection as the ItemsSource
// and expects the LayoutUpdated event to be raised. This is the only way that makes sense for this
// to happen. It's all very strange.
InvalidateMeasure ();
}
