/// <summary>
/// To ensure connection didn't happen twice it first checks if
/// adaptor with that object already exists.
/// If Adaptor with this object specified as Target is already
/// present then object was connected already anyway
/// </summary>
/// <param name="aObject">
/// Object being connected <see cref="System.Object"/>
/// </param>
/// <remarks>
/// If object being connected to is type of PropertyChangedEventHandler
/// then connection to PropertyChanged happens, otherwise it
/// connects to all PropertyChangedEventHandler properties
/// </remarks>
public static void ConnectEvent(object aObject)
{
if (aObject == null)
{
return;
}
if (DataSourceController.CountDataSourceOwners(aObject) > 1)
{
return;
}
if (aObject is INotifyPropertyChanged)
{
(aObject as INotifyPropertyChanged).PropertyChanged += OnObjectPropertyChanged;
}
else
{
// Connect to all PropertyChangedEventHandler properties
foreach (EventInfo ev in aObject.GetType().GetEvents())
{
if (ev.EventHandlerType is PropertyChangedEventHandler)
{
ev.AddEventHandler(aObject, OnObjectPropertyChanged);
}
}
}
}
/// <summary>
/// Disconect only happens if only one Adaptor has this object
/// specified as Target.
/// If not then connection is still valid
/// </summary>
/// <param name="aObject">
/// Object being diconnected <see cref="System.Object"/>
/// </param>
/// <remarks>
/// If object being disconnected from is type of PropertyChangedEventHandler
/// then disconnection from PropertyChanged happens, otherwise it
/// disconnects from all PropertyChangedEventHandler properties
/// </remarks>
public static void DisconnectEvent(object aObject)
{
if (aObject == null)
{
return;
}
if (DataSourceController.CountDataSourceOwners(aObject) > 1)
{
return;
}
if (aObject is INotifyPropertyChanged)
{
(aObject as INotifyPropertyChanged).PropertyChanged -= OnObjectPropertyChanged;
}
else
{
// Disconnect from all PropertyChangedEventHandler properties
foreach (EventInfo ev in aObject.GetType().GetEvents())
{
if (ev.EventHandlerType is PropertyChangedEventHandler)
{
// ev.RemoveEventHandler (aObject, new PropertyChangedEventHandler(ObjectPropertyChanged));
ev.RemoveEventHandler(aObject, OnObjectPropertyChanged);
}
}
}
}