private void NotifySource(ICollectionChangedNotificationResult <TSource> sourceChange, List <TResult> added, List <TResult> removed)
{
if (sourceChange.RemovedItems != null)
{
foreach (var item in sourceChange.RemovedItems)
{
SubSourcePair wrapper;
if (sourceItems.TryGetValue(item, out wrapper))
{
removed.AddRange(wrapper);
wrapper.Successors.Unset(this);
sourceItems.Remove(item);
}
}
}
if (sourceChange.AddedItems != null)
{
foreach (var item in sourceChange.AddedItems)
{
var subSource = func.Observe(item);
var wrapper = new SubSourcePair(subSource, item, this);
wrapper.Successors.Set(this);
sourceItems.Add(item, wrapper);
added.AddRange(wrapper);
}
}
}
protected override void OnAttach()
{
foreach (var item in source)
{
var subSource = func.Observe(item);
var wrapper = new SubSourcePair(subSource, item, this);
wrapper.Successors.Set(this);
sourceItems.Add(item, wrapper);
}
}
private void NotifySource(CollectionChangedNotificationResult <TSource> sourceChange, List <TResult> added, List <TResult> removed)
{
if (sourceChange.RemovedItems != null)
{
foreach (var item in sourceChange.RemovedItems)
{
SubSourcePair wrapper;
if (sourceItems.TryGetValue(item, out wrapper))
{
removed.AddRange(wrapper);
wrapper.Successors.Unset(this);
sourceItems.Remove(item);
}
}
}
if (sourceChange.AddedItems != null)
{
foreach (var item in sourceChange.AddedItems)
{
var subSource = func.Observe(item);
var wrapper = new SubSourcePair(subSource, item, this);
wrapper.Successors.Set(this);
sourceItems.Add(item, wrapper);
added.AddRange(wrapper);
}
}
if (sourceChange.ReplaceAddedItems != null)
{
for (int i = 0; i < sourceChange.ReplaceAddedItems.Count; i++)
{
var oldItem = sourceChange.ReplaceRemovedItems[i];
var newItem = sourceChange.ReplaceAddedItems[i];
var newSubSource = func.Observe(newItem);
SubSourcePair wrapper;
if (sourceItems.TryGetValue(oldItem, out wrapper))
{
removed.AddRange(SL.Select(wrapper.Results.Values, res => res.Value));
wrapper.Successors.Unset(this);
sourceItems.Remove(oldItem);
}
wrapper = new SubSourcePair(newSubSource, newItem, this);
sourceItems.Add(newItem, wrapper);
wrapper.Successors.Set(this);
added.AddRange(SL.Select(wrapper.Results.Values, res => res.Value));
}
}
}
private static void AttachSubSource(SubSourcePair wrapper)
{
if (wrapper.SubSource.Value != null)
{
foreach (var element in wrapper.SubSource.Value)
{
wrapper.AttachResult(element);
}
var notifier = wrapper.SubSource.Value as INotifyCollectionChanged;
if (notifier != null)
{
notifier.CollectionChanged += wrapper.OnCollectionChanged;
}
}
}
protected override void AttachCore()
{
if (source != null)
{
foreach (var item in source)
{
var subSource = func.Observe(item);
var wrapper = new SubSourcePair(subSource, item, this);
sourceItems.Add(item, wrapper);
AttachSubSource(wrapper);
subSource.ValueChanged += wrapper.OnSourceChanged;
}
source.CollectionChanged += SourceCollectionChanged;
}
}
private void SourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Move)
{
return;
}
if (e.Action != NotifyCollectionChangedAction.Reset)
{
if (e.Action == NotifyCollectionChangedAction.Remove && e.OldItems != null)
{
var removed = new List <TResult>();
foreach (TSource item in e.OldItems)
{
SubSourcePair wrapper;
if (sourceItems.TryGetValue(item, out wrapper))
{
removed.AddRange(SL.Select(wrapper.Values.Values, res => res.Value));
DetachSubSource(item);
}
}
OnRemoveItems(removed);
}
if (e.Action == NotifyCollectionChangedAction.Add && e.NewItems != null)
{
var added = new List <TResult>();
foreach (TSource item in e.NewItems)
{
var subSource = func.Observe(item);
var wrapper = new SubSourcePair(subSource, item, this);
sourceItems.Add(item, wrapper);
AttachSubSource(wrapper);
subSource.ValueChanged += wrapper.OnSourceChanged;
added.AddRange(SL.Select(wrapper.Values.Values, res => res.Value));
}
OnAddItems(added);
}
if (e.Action == NotifyCollectionChangedAction.Replace)
{
var removed = new List <TResult>();
var added = new List <TResult>();
for (int i = 0; i < e.OldItems.Count; i++)
{
var oldItem = (TSource)e.OldItems[i];
var newItem = (TSource)e.NewItems[i];
var newSubSource = func.Observe(newItem);
SubSourcePair wrapper;
if (sourceItems.TryGetValue(oldItem, out wrapper))
{
if (wrapper.SubSource.Value != newSubSource.Value)
{
removed.AddRange(SL.Select(wrapper.Values.Values, res => res.Value));
DetachSubSource(oldItem);
wrapper = new SubSourcePair(newSubSource, newItem, this);
sourceItems.Add(newItem, wrapper);
AttachSubSource(wrapper);
newSubSource.ValueChanged += wrapper.OnSourceChanged;
added.AddRange(SL.Select(wrapper.Values.Values, res => res.Value));
}
else
{
wrapper.SubSource.ValueChanged -= wrapper.OnSourceChanged;
wrapper.SubSource = newSubSource;
wrapper.SubSource.ValueChanged += wrapper.OnSourceChanged;
sourceItems.Remove(oldItem);
sourceItems.Add(newItem, wrapper);
wrapper.ReplaceItem(newItem);
}
}
else
{
wrapper = new SubSourcePair(newSubSource, newItem, this);
sourceItems.Add(newItem, wrapper);
AttachSubSource(wrapper);
newSubSource.ValueChanged += wrapper.OnSourceChanged;
added.AddRange(SL.Select(wrapper.Values.Values, res => res.Value));
}
}
OnAddItems(added);
OnRemoveItems(removed);
}
}
else
{
DetachSource();
OnCleared();
}
}
