public void ReplaceWith(IEnumerable <TItem> items)
{
collection.ReplaceWith(items);
var changes = new CollectionChangesListBuilder <TItem>();
changes.Reload();
collectionChangesSubject.OnNext(changes.Build());
}
public TItem RemoveItemAt(int section, int row)
{
var index = new SectionedIndex(section, row);
var item = collection.RemoveItemAt(section, row);
var changes = new CollectionChangesListBuilder <TItem>();
changes.RemoveRow(index);
collectionChangesSubject.OnNext(changes.Build());
return(item);
}
public (SectionedIndex index, bool needsNewSection) InsertItem(TItem item)
{
var(index, needsNewSection) = collection.InsertItem(item);
var changes = new CollectionChangesListBuilder <TItem>();
if (needsNewSection)
{
changes.InsertSection(index.Section, item);
}
else
{
changes.AddRow(index, item);
}
collectionChangesSubject.OnNext(changes.Build());
return(index, needsNewSection);
}
public SectionedIndex?UpdateItem(IComparable key, TItem item)
{
var oldIndex = collection.IndexOf(key);
if (!oldIndex.HasValue)
{
return(InsertItem(item).index);
}
var changes = new CollectionChangesListBuilder <TItem>();
var section = collection.FitsIntoSection(item);
var movesToDifferentSection = !section.HasValue || section.Value != oldIndex.Value.Section;
collection.RemoveItemAt(oldIndex.Value.Section, oldIndex.Value.Row);
var(newIndex, needsNewSection) = collection.InsertItem(item);
if (!movesToDifferentSection && oldIndex.Value.Equals(newIndex))
{
changes.UpdateRow(newIndex, item);
}
else
{
if (needsNewSection)
{
changes.MoveRowToNewSection(oldIndex.Value, newIndex.Section, item);
}
else
{
changes.MoveRowWithinExistingSections(oldIndex.Value, newIndex, item, movesToDifferentSection);
}
}
collectionChangesSubject.OnNext(changes.Build());
return(newIndex);
}