private void _OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs args)
{
if (args.Action == NotifyCollectionChangedAction.Add)
{
if (args.NewItems.Count != 1)
{
throw new NotSupportedException(SR.Get(SRID.RangeActionsNotSupported));
}
else
{
// get the affected item
object item = args.NewItems[0];
DocumentsTrace.FixedDocumentSequence.Content.Trace(string.Format("_OnCollectionChange: Add {0}", item.GetHashCode()));
AddLogicalChild(item);
int pageCount = this.PageCount;
DynamicDocumentPaginator paginator = GetPaginator((DocumentReference)item);
if (paginator == null)
{
throw new ApplicationException(SR.Get(SRID.DocumentReferenceHasInvalidDocument));
}
int addedPages = paginator.PageCount;
int firstPage = pageCount - addedPages;
if (addedPages > 0)
{
DocumentsTrace.FixedDocumentSequence.Content.Trace(string.Format("_OnCollectionChange: Add with IDP {0}", paginator.GetHashCode()));
_paginator.NotifyPaginationProgress(new PaginationProgressEventArgs(firstPage, addedPages));
_paginator.NotifyPagesChanged(new PagesChangedEventArgs(firstPage, addedPages));
}
}
}
else
{
throw new NotSupportedException(SR.Get(SRID.UnexpectedCollectionChangeAction, args.Action));
}
}