public void OnPropertyChanged(object newValue, [CallerMemberName] string propertyName = null)
{
if (propertyName == null)
{
throw new ArgumentNullException(nameof(propertyName));
}
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
if (!IsTracking)
{
return;
}
object oldValue;
if (_firstValues.TryGetValue(propertyName, out oldValue))
{
var oldCount = _dirtyValues.Count;
if (Equals(newValue, oldValue))
{
// remove dirty
if (_dirtyValues.Remove(propertyName))
{
RemovedDirty?.Invoke(propertyName);
}
}
else
{
// add dirty
if (!_dirtyValues.ContainsKey(propertyName))
{
_dirtyValues.Add(propertyName, newValue);
AddedDirty?.Invoke(propertyName);
}
else
{
_dirtyValues[propertyName] = newValue;
}
}
var newCount = _dirtyValues.Count;
if (oldCount != newCount)
{
DirtyCountChanged?.Invoke();
}
}
else
{
// first initialisation
_firstValues.Add(propertyName, newValue);
}
}
public void ClearDirties()
{
var hadDirty = _dirtyValues.Count != 0;
foreach (var pair in _dirtyValues)
{
_firstValues[pair.Key] = pair.Value;
}
_dirtyValues.Clear();
if (hadDirty)
{
DirtyCountChanged?.Invoke();
}
}
