private void OnSeriesChanged(IPieSeries oldValue, IPieSeries newValue)
{
if (_isLoaded)
{
UnsubscribeFrom(oldValue);
SubscribeTo(newValue);
}
}
private void UnsubscribeFrom(IPieSeries series)
{
var notifiable = series as INotifyPropertyChanged;
if (notifiable != null)
{
notifiable.PropertyChanged -= SeriesOnPropertyChanged;
}
if (series != null)
{
UnsubscribeFrom(series.Slices);
}
ClearItems();
}
private void SubscribeTo(IPieSeries series)
{
var notifiable = series as INotifyPropertyChanged;
if (notifiable != null)
{
notifiable.PropertyChanged += SeriesOnPropertyChanged;
}
if (series != null)
{
SubscribeTo(series.Slices);
AddItems(series.Slices);
_slices = series.Slices;
}
else
{
_slices = null;
}
SumOfSlices = _slices != null
? _slices.Sum(x => x.Value)
: 0;
}
