public DataGridPageManagerEnumerator( DataGridPageManagerBase dataGridPageManagerBase )
{
if( dataGridPageManagerBase == null )
throw new ArgumentNullException( "dataGridPageManagerBase" );
m_dataGridPageManagerBase = dataGridPageManagerBase;
VirtualList[] orderedVirtualLists =
m_dataGridPageManagerBase.m_virtualListVSCollectionViewGroupDictionary.Keys.OrderBy(
virtualList => m_dataGridPageManagerBase.m_virtualListVSCollectionViewGroupDictionary[ virtualList ].StartGlobalIndex ).ToArray();
m_orderedVirtualListEnumerators = new VirtualListEnumerator[ orderedVirtualLists.Length ];
for( int i = 0; i < orderedVirtualLists.Length; i++ )
{
m_orderedVirtualListEnumerators[ i ] = ( VirtualListEnumerator )( ( IEnumerable )orderedVirtualLists[ i ] ).GetEnumerator();
}
}
public bool MoveNext()
{
// No need to check the VirtualPageManager's version. The sub VirtualLists' Enumerator will take care of it.
while (m_currentEnumeratorIndex < m_orderedVirtualListEnumerators.Length)
{
VirtualListEnumerator enumerator = m_orderedVirtualListEnumerators[m_currentEnumeratorIndex];
enumerator.MoveNext();
if (!enumerator.AfterEnd)
{
m_currentItem = enumerator.Current;
return(true);
}
else
{
// Reached the end of this enumerator. Let's increment the currentEnumeratorIndex.
m_currentEnumeratorIndex++;
}
}
m_currentItem = null;
return(false);
}
