internal SelectionRangeWithItems(SelectionRange range, SharedList items)
{
if ((items.Count != range.Length) && (!range.IsEmpty))
{
throw new ArgumentException("selectionRange and items must have the same length.");
}
m_items = new OptimizedItemsList(items);
m_range = range;
}
public static void UpdateSelectionRangeWithItemsFromAdd(
DataGridContext dataGridContext,
SelectionRangeWithItems newRangeWithItems,
ref SelectionRangeWithItems lastRangeWithItems)
{
// Only work for adding at the end of an existing range.
object[] newRangeItems = newRangeWithItems.Items;
if ((dataGridContext == null) ||
((dataGridContext.ItemsSourceCollection == null) && (newRangeItems == null)) ||
(dataGridContext.ItemsSourceCollection is DataGridVirtualizingCollectionViewBase))
{
lastRangeWithItems = new SelectionRangeWithItems(new SelectionRange(lastRangeWithItems.Range.StartIndex, newRangeWithItems.Range.EndIndex), null);
return;
}
SharedList newItemsList;
if (newRangeWithItems == lastRangeWithItems)
{
if (newRangeItems != null)
{
return;
}
newItemsList = new SharedList(lastRangeWithItems.Length);
}
else
{
int minNewCapacity = lastRangeWithItems.Length + newRangeWithItems.Length;
// Optimization, re-use the ItemsList if available.
if (lastRangeWithItems.SharedList != null)
{
newItemsList = lastRangeWithItems.SharedList.Value;
newItemsList.EnsureCapacity(minNewCapacity);
}
else
{
newItemsList = new SharedList(minNewCapacity);
newItemsList.AddRange(lastRangeWithItems.Items);
}
}
var rangeToUpdateStartIndex = lastRangeWithItems.Range.StartIndex;
var newRangeEndIndex = newRangeWithItems.Range.EndIndex;
// If new range have no items set, found the items and set it.
if (newRangeItems == null)
{
var items = dataGridContext.Items;
var newRangeStartIndex = newRangeWithItems.Range.StartIndex;
if (newRangeEndIndex > newRangeStartIndex)
{
for (int i = newRangeStartIndex; i <= newRangeEndIndex; i++)
{
newItemsList.Add(items.GetItemAt(i));
}
}
else
{
for (int i = newRangeStartIndex; i >= newRangeEndIndex; i--)
{
newItemsList.Add(items.GetItemAt(i));
}
}
}
else
{
newItemsList.AddRange(newRangeItems);
}
lastRangeWithItems = new SelectionRangeWithItems(new SelectionRange(rangeToUpdateStartIndex, newRangeEndIndex), newItemsList);
}
public OptimizedItemsList(SharedList list)
{
m_itemsArray = null;
m_itemsList = list;
}
