protected override void RemoveItem(int index)
{
T item = this[index];
if (item is INotifyPropertyChanged notify)
{
notify.PropertyChanged -= Item_PropertyChanged;
}
base.RemoveItem(index);
Removed?.Invoke(this, new SingleChangeEventArgs <T>(index, item, SingleChangeType.Removed));
RemovedAny?.Invoke(this, new SingleChangeEventArgs <T>(index, item, SingleChangeType.Removed));
}
protected override void SetItem(int index, T newItem)
{
T oldItem = this[index];
if (oldItem is INotifyPropertyChanged oldNotify)
{
oldNotify.PropertyChanged -= Item_PropertyChanged;
}
base.SetItem(index, newItem);
Set?.Invoke(this, new SetItemEventArgs <T>(index, oldItem, newItem));
if (newItem is INotifyPropertyChanged newNotify)
{
newNotify.PropertyChanged += Item_PropertyChanged;
}
RemovedAny?.Invoke(this, new SingleChangeEventArgs <T>(index, oldItem, SingleChangeType.Removed));
AddedAny?.Invoke(this, new SingleChangeEventArgs <T>(index, newItem, SingleChangeType.Added));
}
protected override void ClearItems()
{
T[] items = new T[Count];
for (int i = 0; i < Count; i++)
{
if (items[i] is INotifyPropertyChanged notify)
{
notify.PropertyChanged -= Item_PropertyChanged;
}
items[i] = this[i];
}
base.ClearItems();
Cleared?.Invoke(this, new CollectionClearEventArgs <T>(items));
for (int i = 0; i < items.Length; i++)
{
RemovedAny?.Invoke(this, new SingleChangeEventArgs <T>(i, items[i], SingleChangeType.Removed));
}
}