internal static VirtualPage CreateEmptyPage(VirtualList parentVirtualList, int startSourceIndex, int entryCount)
{
if (parentVirtualList == null)
{
throw new ArgumentNullException("parentVirtualList");
}
if (startSourceIndex < 0)
{
throw new ArgumentOutOfRangeException("startSourceIndex", startSourceIndex, "startSourceIndex must be greater than or equal to zero.");
}
if (entryCount < 0)
{
throw new ArgumentOutOfRangeException("entryCount", entryCount, "entryCount must be greater than or equal to zero.");
}
EmptyDataItem[] emptyDataItems = new EmptyDataItem[entryCount];
for (int i = 0; i < entryCount; i++)
{
emptyDataItems[i] = new EmptyDataItem(startSourceIndex + i, parentVirtualList);
}
VirtualPage emptyDataItemPage = new VirtualPage(parentVirtualList, startSourceIndex, emptyDataItems);
emptyDataItemPage.IsFilled = false;
return(emptyDataItemPage);
}
internal int IndexOf(object item)
{
if ((item == null) || (this.IsDisposed))
{
return(-1);
}
EmptyDataItem emptyDataItem = item as EmptyDataItem;
if (emptyDataItem != null)
{
if ((emptyDataItem.ParentVirtualList == this) && (emptyDataItem.Index < m_virtualCount))
{
return(emptyDataItem.Index);
}
return(-1);
}
return(m_tableOfContent.IndexOf(item));
}