/// <summary>
/// Gets an AttachedChangedListener using the provided actions.
/// </summary>
/// <param name="attachedHandler">An action called when the view is attached</param>
/// <param name="detachedHandler">An action called when the view is detached</param>
/// <returns>An AttachedChangedListener instance</returns>
internal static AttachedChangedListener CreateChangedListener(Action <View> attachedHandler, Action <View> detachedHandler)
{
AttachedChangedListener listener;
if (attachedHandler == null)
{
throw new ArgumentNullException(nameof(attachedHandler));
}
if (detachedHandler == null)
{
throw new ArgumentNullException(nameof(detachedHandler));
}
if (_listenerPool.Count != 0)
{
listener = _listenerPool.Pop();
}
else
{
listener = new AttachedChangedListener();
}
listener.AttachedHandler = attachedHandler;
listener.DetachedHandler = detachedHandler;
return(listener);
}
/// <summary>
/// Releases an AttachedChangedListener instance.
/// </summary>
/// <param name="listener">An AttachedChangedListener instance.</param>
internal static void ReleaseChangedListener(AttachedChangedListener listener)
{
if (_listenerPool.Count < MaxPoolInstances)
{
listener.AttachedHandler = null;
listener.DetachedHandler = null;
_listenerPool.Push(listener);
}
else
{
listener.AttachedHandler = null;
listener.DetachedHandler = null;
listener.Dispose();
}
}
