public override INotificationResult Notify(IList <INotificationResult> sources)
{
var notification = CollectionChangedNotificationResult <INotifyGrouping <TKey, TItem> > .Create(this);
var added = notification.AddedItems;
var removed = notification.RemovedItems;
foreach (var change in sources)
{
if (change.Source == source)
{
var sourceChange = (ICollectionChangedNotificationResult <TItem>)change;
if (sourceChange.IsReset)
{
OnDetach();
OnAttach();
OnCleared();
notification.TurnIntoReset();
return(notification);
}
else
{
NotifySource(sourceChange, added, removed);
}
}
else
{
var keyChange = (IValueChangedNotificationResult <TKey>)change;
var tagged = (TaggedObservableValue <TKey, TItem>)keyChange.Source;
ObservableGroup <TKey, TItem> group;
if (groups.TryGetValue(keyChange.OldValue, out group))
{
group.Items.Remove(tagged.Tag);
if (group.Count == 0)
{
groups.Remove(keyChange.OldValue);
removed.Add(group);
}
}
if (!groups.TryGetValue(keyChange.NewValue, out group))
{
group = new ObservableGroup <TKey, TItem>(keyChange.NewValue);
groups.Add(keyChange.NewValue, group);
added.Add(group);
}
group.Items.Add(tagged.Tag);
}
}
if (added.Count == 0 && removed.Count == 0)
{
return(UnchangedNotificationResult.Instance);
}
OnRemoveItems(removed.Cast <ObservableGroup <TKey, TItem> >());
OnAddItems(added.Cast <ObservableGroup <TKey, TItem> >());
return(notification);
}
private void AttachItem(TItem item, INotifyValue <TKey> key)
{
var entry = new Entry(key, item, this);
Stack <Entry> entryStack;
if (!keys.TryGetValue(item, out entryStack))
{
entryStack = new Stack <Entry>();
keys.Add(item, entryStack);
}
entryStack.Push(entry);
var add = false;
ObservableGroup <TKey, TItem> group;
if (!groups.TryGetValue(key.Value, out group))
{
group = new ObservableGroup <TKey, TItem>(key.Value);
groups.Add(key.Value, group);
add = true;
}
group.ItemsInternal.Add(item);
key.ValueChanged += entry.KeyChanged;
if (add)
{
OnAddItem(group);
}
}
public override bool Contains(ObservableGroup <TKey, TItem> item)
{
if (item != null)
{
return(groups.ContainsValue(item));
}
else
{
return(false);
}
}
private bool AttachItem(TItem item)
{
var key = keySelector.InvokeTagged(item, item);
key.Successors.Set(this);
keys[item] = key;
var add = false;
ObservableGroup <TKey, TItem> group;
if (!groups.TryGetValue(key.Value, out group))
{
group = new ObservableGroup <TKey, TItem>(key.Value);
groups.Add(key.Value, group);
add = true;
}
group.Items.Add(item);
return(add);
}
public void KeyChanged(object sender, ValueChangedEventArgs e)
{
ObservableGroup <TKey, TItem> group;
var oldKey = (TKey)e.OldValue;
if (Parent.groups.TryGetValue(oldKey, out group))
{
group.ItemsInternal.Remove(Item);
if (group.Count == 0)
{
Parent.groups.Remove(oldKey);
Parent.OnRemoveItem(group);
}
}
var newKey = (TKey)e.NewValue;
if (!Parent.groups.TryGetValue(newKey, out group))
{
group = new ObservableGroup <TKey, TItem>(newKey);
Parent.groups.Add(newKey, group);
Parent.OnAddItem(group);
}
group.ItemsInternal.Add(Item);
}