public int GetGlobalIndexOf(object item)
{
ReadOnlyCollection <VirtualList> virtualItemLists = this.ManagedLists;
int virtualItemListsCount = virtualItemLists.Count;
for (int i = 0; i < virtualItemListsCount; i++)
{
VirtualList localList = virtualItemLists[i];
int localIndex = localList.IndexOf(item);
if (localIndex >= 0)
{
Debug.Assert(m_virtualListVSCollectionViewGroupDictionary.ContainsKey(localList));
DataGridVirtualizingCollectionViewGroupBase dgvcvg = m_virtualListVSCollectionViewGroupDictionary[localList];
return(localIndex + dgvcvg.StartGlobalIndex);
}
}
return(-1);
}
internal VirtualizedItemValueCollection GetCachedValuesForItem(object item)
{
LinkedListNode <VirtualPage> pageNode = m_pageNodes.First;
while (pageNode != null)
{
VirtualList virtualList = pageNode.Value.ParentVirtualList;
Debug.Assert(m_managedLists.Contains(virtualList));
int localIndex = virtualList.IndexOf(item);
if (localIndex != -1)
{
return(virtualList.GetCachedValuesForItemAtIndex(localIndex));
}
pageNode = pageNode.Next;
}
return(null);
}
internal void ClearCachedValuesForItem(object item)
{
LinkedListNode <VirtualPage> pageNode = m_pageNodes.First;
while (pageNode != null)
{
VirtualList virtualList = pageNode.Value.ParentVirtualList;
Debug.Assert(m_managedLists.Contains(virtualList));
int localIndex = virtualList.IndexOf(item);
if (localIndex != -1)
{
virtualList.ClearCachedValuesForItemAtIndex(localIndex);
return;
}
pageNode = pageNode.Next;
}
throw new InvalidOperationException("An attempt was made to leave the edit process on an unknown item.");
}