/// <summary>
/// Replaces elements of <see cref="NavigableCollection{T, TMetadata}"/> with the elements in the specified sequence.
/// </summary>
/// <param name="source">The sequence of replacement elements.</param>
public void Recompose(IEnumerable <Lazy <T, TMetadata> > source)
{
Requires.NotNull(source, nameof(source));
Lazy <T, TMetadata>[] array = source.ToArray();
using (Recomposition recomposition = new Recomposition(this))
{
if (collection.Count > 0)
{
collection.Clear();
}
for (int i = 0; i < array.Length; i++)
{
collection.Add(array[i]);
}
if (current != UnsetTuple)
{
T obj = current.Item1;
foreach (Lazy <T, TMetadata> item in collection)
{
if (item != null)
{
TMetadata metadata = item.Metadata;
if (metadata != null && metadata.Route == current.Item2 && ReferenceEquals(item.Value, obj))
{
return;
}
}
}
current = UnsetTuple;
if (obj != null)
{
recomposition.Dispose();
OnCurrentChanged();
OnPropertyChanged(CurrentPropertyChanged);
NavigatedFrom(obj);
}
}
}
}
/// <summary>
/// Synchronizes the <see cref="RecomposableCollection{T}"/> with the elements in the specified sequence.
/// </summary>
/// <param name="source">The sequence of replacement elements.</param>
public void Recompose(IEnumerable <T> source)
{
Requires.NotNull(source, nameof(source));
T[] array = source.ToArray();
using (Recomposition recomposition = new Recomposition(this))
{
if (array.Length == 0)
{
if (collection.Count > 0)
{
T[] items = collection.ToArray();
collection.Clear();
recomposition.Dispose();
OnRecomposed(new RecomposedEventArgs <T>(Array.Empty <T>(), Array.AsReadOnly(items)));
}
return;
}
List <T> list = new List <T>(array);
List <int> indexes = new List <int>();
for (int i = 0; i < collection.Count; i++)
{
if (list.Count > 0)
{
int index = list.IndexOf(collection[i], comparer);
if (index < 0)
{
indexes.Add(i);
continue;
}
list.RemoveAt(index);
continue;
}
indexes.Add(i);
}
if (indexes.Count == collection.Count)
{
T[] items = Array.Empty <T>();
if (collection.Count > 0)
{
items = collection.ToArray();
collection.Clear();
}
for (int i = 0; i < array.Length; i++)
{
collection.Add(array[i]);
}
recomposition.Dispose();
OnRecomposed(new RecomposedEventArgs <T>(Array.AsReadOnly(array), Array.AsReadOnly(items)));
return;
}
List <T> added = new List <T>();
List <T> removed = new List <T>();
for (int i = indexes.Count - 1; i >= 0; i--)
{
T item = collection[indexes[i]];
collection.RemoveAt(indexes[i]);
removed.Insert(0, item);
}
for (int i = 0; i < array.Length; i++)
{
if (i < collection.Count)
{
if (comparer.Equals(array[i], collection[i]))
{
continue;
}
if (i < collection.Count - 1)
{
int index = collection.IndexOf(array[i], i + 1, comparer);
if (index > 0)
{
collection.Move(index, i);
continue;
}
}
collection.Insert(i, array[i]);
added.Add(array[i]);
continue;
}
collection.Add(array[i]);
added.Add(array[i]);
}
while (collection.Count > array.Length)
{
T item = collection[array.Length];
collection.RemoveAt(array.Length);
removed.Add(item);
}
if (added.Count > 0 || removed.Count > 0)
{
recomposition.Dispose();
OnRecomposed(new RecomposedEventArgs <T>(added.AsReadOnly(), removed.AsReadOnly()));
}
}
}
