internal object GetItemAt(int index)
{
if ((index < 0) || (index >= m_virtualCount))
{
throw new ArgumentOutOfRangeException("Index", index, "index must be greater than or equal to zero and less than count.");
}
VirtualizedItemInfo virtualizedItemInfo = this.GetVirtualizedItemInfoAtIndex(index, true, false);
return(virtualizedItemInfo.DataItem);
}
internal void ClearCachedValuesForItemAtIndex(int index)
{
VirtualizedItemInfo virtualizedItemInfo = this.GetVirtualizedItemInfoAtIndex(index, false, true);
if (virtualizedItemInfo == null)
{
throw new ArgumentOutOfRangeException("index", index, "No VirtualizedItemInfo can be found at the specified index.");
}
virtualizedItemInfo.OldValues = null;
}
internal void SetCachedValuesForItemAtIndex(int index, string[] names, object[] values)
{
VirtualizedItemInfo virtualizedItemInfo = this.GetVirtualizedItemInfoAtIndex(index, false, true);
if (virtualizedItemInfo == null)
{
throw new ArgumentOutOfRangeException("index", index, "No VirtualizedItemInfo can be found at the specified index.");
}
virtualizedItemInfo.OldValues = new VirtualizedItemValueCollection(names, values);
}
internal bool IsItemDirty(object item)
{
int localIndex = this.IndexOf(item);
if (localIndex == -1)
{
return(false);
}
VirtualizedItemInfo virtualizedItemInfo = this.GetVirtualizedItemInfoAtIndex(localIndex, false, true);
return((virtualizedItemInfo == null) ? false : virtualizedItemInfo.IsDirty);
}
public void AddPage(VirtualPage page)
{
Debug.Assert(!m_virtualPages.Contains(page));
m_virtualPages.Add(page);
int itemCount = page.Count;
for (int i = 0; i < itemCount; i++)
{
VirtualizedItemInfo virtualizedItemInfo = page[i];
Debug.Assert(!m_objectVersusIndexDictionary.ContainsKey(virtualizedItemInfo.DataItem));
Debug.Assert(!m_indexVersusPageDictionary.ContainsKey(virtualizedItemInfo.Index));
m_objectVersusIndexDictionary.Add(virtualizedItemInfo.DataItem, virtualizedItemInfo.Index);
m_indexVersusPageDictionary.Add(virtualizedItemInfo.Index, page);
}
}
public void RemovePage(VirtualPage page)
{
Debug.Assert(m_virtualPages.Contains(page));
int itemCount = page.Count;
for (int i = 0; i < itemCount; i++)
{
VirtualizedItemInfo virtualizedItemInfo = page[i];
Debug.Assert(m_objectVersusIndexDictionary.ContainsKey(virtualizedItemInfo.DataItem));
Debug.Assert(m_indexVersusPageDictionary.ContainsKey(virtualizedItemInfo.Index));
Debug.Assert(m_indexVersusPageDictionary[virtualizedItemInfo.Index] == page);
m_objectVersusIndexDictionary.Remove(virtualizedItemInfo.DataItem);
m_indexVersusPageDictionary.Remove(virtualizedItemInfo.Index);
}
m_virtualPages.Remove(page);
}
internal VirtualizedItemInfo GetVirtualizedItemInfoAtIndex(int index, bool createPageIfLineNotFound, bool preventMovePageToFront)
{
VirtualizedItemInfo virtualizedItemInfo = null;
VirtualPage page = this.GetPageOrDefaultForItemIndex(index, preventMovePageToFront);
if (page != null)
{
virtualizedItemInfo = page.GetVirtualizedItemInfoAtIndex(index);
Debug.Assert(virtualizedItemInfo != null);
//if( ( virtualizedItemInfo == null ) && ( createPageIfLineNotFound ) )
//{
// // No VirtualizedItemInfo was found at the requested index.
// LinkedListNode<VirtualPage> firstPageNode = m_pageNodes.First;
// Debug.Assert( firstPageNode != null, "If the page is not null, there should be at least one page in the book." );
// if( firstPageNode.Value != page )
// {
//
// page = this.CreateNewPage( index );
// virtualizedItemInfo = page.GetVirtualizedItemInfoAtIndex( index );
// this.AddPageToFront( page );
// }
//}
}
else if (createPageIfLineNotFound)
{
page = this.CreateNewPage(index);
virtualizedItemInfo = page.GetVirtualizedItemInfoAtIndex(index);
m_pagingManager.AddPage(page, VirtualPageManager.PageInsertPosition.Front);
}
return(virtualizedItemInfo);
}
internal VirtualizedItemValueCollection GetCachedValuesForItemAtIndex(int index)
{
VirtualizedItemInfo virtualizedItemInfo = this.GetVirtualizedItemInfoAtIndex(index, false, true);
return((virtualizedItemInfo == null) ? null : virtualizedItemInfo.OldValues);
}
