///-------------------------------------------------------------------------------------------------
/// <summary>
/// Registers for attribute changed event.
/// </summary>
/// <param name="element">
/// The element.
/// </param>
///-------------------------------------------------------------------------------------------------
public IDisposable RegisterForAttributeChangedEvent(IModelElement element)
{
if (element is IPropertyChangedNotifier)
{
DebugContract.Requires(element.Id);
_attributedChangedObserversSync.EnterWriteLock();
try
{
if (_attributedChangedObservers.ContainsKey(element.Id))
{
_attributedChangedObservers[element.Id]++;
}
else
{
_attributedChangedObservers.Add(element.Id, 1);
}
return(Disposables.ExecuteOnDispose(() =>
{
_attributedChangedObservers[element.Id]--;
if (_attributedChangedObservers[element.Id] == 0)
{
_attributedChangedObservers.Remove(element.Id);
}
}));
}
finally
{
_attributedChangedObserversSync.ExitWriteLock();
}
}
return(Disposables.Empty);
}
IDisposable ISupportsCalculatedPropertiesTracking.PushCalculatedPropertyTracker(CalculatedProperty tracker)
{
var ctx = SessionDataContext;
if (ctx == null)
{
return(Disposables.Empty);
}
if (ctx.Trackers == null)
{
ctx.Trackers = new Stack <CalculatedProperty>();
}
ctx.Trackers.Push(tracker);
return(Disposables.ExecuteOnDispose(() => SessionDataContext.Trackers.Pop()));
}