private void CaptureProperty(string property, bool isCollection = false)
{
if (_staleProperties.ContainsKey(property))
{
_staleProperties.Remove(property);
OnPropertyChanged(nameof(IsStale));
}
if (isCollection)
{
var enumerable = (IEnumerable)_viewModel.GetPropertyValue(property);
var objects = enumerable?.ToArray();
if (enumerable is INotifyCollectionChanged collectionChanged &&
!_subscriptions.Values.Contains(enumerable))
{
collectionChanged.CollectionChanged += OnCollectionChanged;
}
_subscriptions[property] = enumerable;
_originalCollectionValues = _originalCollectionValues ?? new Dictionary <string, object[]>();
CaptureInternalStaleMonitors(enumerable);
_originalCollectionValues[property] = objects;
}
else
{
_originalPropertyValues = _originalPropertyValues ?? new Dictionary <string, object>();
var propertyValue = _viewModel.GetPropertyValue(property);
_originalPropertyValues[property] = propertyValue;
if (propertyValue != null && propertyValue is IStaleMonitorViewModel viewModel)
{
viewModel.StaleMonitor?.Capture();
if (!_subscriptions.Values.Contains(viewModel) && viewModel.StaleMonitor != null)
{
viewModel.StaleMonitor.PropertyChanged +=
(sender, args) => HandlePropertyChanged(viewModel, property);
_subscriptions[property] = viewModel;
}
}
}
}
private bool CheckPropertyIsStale(string property)
{
if (_originalPropertyValues?.ContainsKey(property) != true)
{
return(false);
}
object oldValue = null;
var newValue = _viewModel?.GetPropertyValue(property);
var isStale = false;
if (_originalPropertyValues?.TryGetValue(property, out oldValue) == true)
{
isStale = !newValue.ObjectsEqual(oldValue);
}
if (!isStale && newValue != null && newValue is IStaleMonitorViewModel viewModel)
{
isStale = viewModel.StaleMonitor.IsStale;
}
return(isStale);
}
