private void OnContainerReplacedInItems(IndexedFilterItemContainer <T> newItem,
IndexedFilterItemContainer <T> oldItem,
int index)
{
if (newItem.Value && !oldItem.Value)
{
UpdateIndexes(index, Items.Count);
FilteredItems.Insert(newItem.LocalIndex - 1, newItem.Item);
}
else if (oldItem.Value && !newItem.Value)
{
UpdateIndexes(index, Items.Count);
FilteredItems.RemoveAt(oldItem.LocalIndex - 1);
}
else
{
newItem.GlobalIndex = oldItem.GlobalIndex;
newItem.LocalIndex = oldItem.LocalIndex;
if (newItem.Value)
{
FilteredItems[newItem.LocalIndex - 1] = newItem.Item;
}
}
oldItem.GlobalIndex = int.MinValue;
oldItem.LocalIndex = int.MinValue;
}
/// <summary>
/// Creates a container for an item that is included in the source collection.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>
/// Container for <paramref name="item" />.
/// </returns>
protected override IndexedFilterItemContainer <T> CreateContainer(T item)
{
var container = new IndexedFilterItemContainer <T>(item, Filter(item));
container.ValueChanged += ContainerOnIsIncludedChanged;
return(container);
}
private void OnContainerAddedToItems(IndexedFilterItemContainer <T> item, int index)
{
UpdateIndexes(index, Items.Count);
if (item.Value)
{
FilteredItems.Insert(item.LocalIndex - 1, item.Item);
}
}
private void OnContainerRemovedFromItems(IndexedFilterItemContainer <T> item, int index)
{
UpdateIndexes(index, Items.Count);
if (item.Value)
{
FilteredItems.RemoveAt(item.LocalIndex - 1);
}
item.LocalIndex = item.GlobalIndex = int.MinValue;
}
private void OnContainerMovedInItems(IndexedFilterItemContainer <T> item, int oldIndex, int newIndex)
{
var oldLocalIndex = item.LocalIndex - 1;
if (oldIndex > newIndex)
{
UpdateIndexes(newIndex, oldIndex + 1);
}
else
{
UpdateIndexes(oldIndex, newIndex + 1);
}
var newLocalIndex = item.LocalIndex - 1;
if (item.Value)
{
FilteredItems.Move(oldLocalIndex, newLocalIndex);
}
}
/// <summary>
/// Destroys a container when it's item is removed from the source collection.
/// </summary>
/// <param name="container">The container.</param>
protected override void DestroyContainer(IndexedFilterItemContainer <T> container)
{
container.Dispose();
container.ValueChanged -= ContainerOnIsIncludedChanged;
}
