protected override void RestoreStateCore(IDataGridContextVisitable dataGridContextVisitable)
{
try
{
m_rootDataGridContext = SaveRestoreDataGridContextStateVisitor.GetDataGridContextFromVisitable(dataGridContextVisitable);
if (m_saveExpandedItems)
{
for (int i = 0; i < m_itemsToExpand.Count; i++)
{
object dataItemToExpand = m_itemsToExpand[i].Target;
if (dataItemToExpand != null)
{
try
{
// Verify if we have a System.Data.DataView as ItemsSource to
// ensure to restore the System.Data.DataRowView that represents
// the System.Data.DataRow saved previously
System.Data.DataView dataView =
ItemsSourceHelper.TryGetDataViewFromDataGridContext(m_rootDataGridContext);
if ((dataView != null) &&
(dataItemToExpand is System.Data.DataRow))
{
foreach (System.Data.DataRowView dataRowView in dataView)
{
if (dataRowView.Row == dataItemToExpand)
{
dataItemToExpand = dataRowView;
break;
}
}
}
m_rootDataGridContext.ExpandDetails(dataItemToExpand);
}
catch
{
System.Diagnostics.Debug.Assert(false, "Item has moved in the source ?");
}
}
}
}
bool visitWasStopped;
dataGridContextVisitable.AcceptVisitor(0, int.MaxValue, this, DataGridContextVisitorType.Groups, false, out visitWasStopped);
}
finally
{
m_itemsToExpand = null;
m_rootDataGridContext = null;
}
}
private void RecursiveSaveDataGridContextsState(DataGridContext dataGridContext)
{
var saveRestoreDataGridContextStateVisitor = new SaveRestoreDataGridContextStateVisitor(true, int.MaxValue, m_stopAtFirstCollapsedGroup);
saveRestoreDataGridContextStateVisitor.SaveState(dataGridContext as IDataGridContextVisitable);
m_dataGridContextsStateDictionary.Add(new WeakDataGridContextKey(dataGridContext), saveRestoreDataGridContextStateVisitor);
foreach (var subDataGridContext in dataGridContext.GetChildContextsCore())
{
this.RecursiveSaveDataGridContextsState(subDataGridContext);
}
}
private void RecursiveSaveDataGridContextsState( DataGridContext dataGridContext )
{
SaveRestoreDataGridContextStateVisitor saveRestoreDataGridContextStateVisitor
= new SaveRestoreDataGridContextStateVisitor( true, int.MaxValue, m_stopAtFirstCollapsedGroup );
saveRestoreDataGridContextStateVisitor.SaveState( dataGridContext as IDataGridContextVisitable );
m_dataGridContextsStateDictionary.Add( new WeakDataGridContextKey( dataGridContext ), saveRestoreDataGridContextStateVisitor );
IEnumerable<DataGridContext> subDataGridContexts = dataGridContext.GetChildContexts();
foreach( DataGridContext subDataGridContext in subDataGridContexts )
{
this.RecursiveSaveDataGridContextsState( subDataGridContext );
}
}
internal void SaveDataGridContextState( DataGridContext dataGridContext, bool handleExpandedItems, int maxGroupLevel )
{
if( dataGridContext == null )
throw new ArgumentNullException( "dataGridContext" );
Debug.Assert( !dataGridContext.IsRestoringState );
if( dataGridContext.IsSavingState )
return;
dataGridContext.IsSavingState = true;
try
{
WeakDataGridContextKey weakDataGridContextKey = new WeakDataGridContextKey( dataGridContext );
if( m_dataGridContextsStateDictionary == null )
{
m_dataGridContextsStateDictionary = new Dictionary<WeakDataGridContextKey, SaveRestoreDataGridContextStateVisitor>();
}
else if( m_dataGridContextsStateDictionary.ContainsKey( weakDataGridContextKey ) )
{
// Already a state saved for this context. Don't overwrite it.
Debug.WriteLineIf( this.DebugSaveRestore, "Already a state saved for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() );
return;
}
SaveRestoreDataGridContextStateVisitor saveRestoreDataGridContextStateVisitor = new SaveRestoreDataGridContextStateVisitor( handleExpandedItems, maxGroupLevel, false );
try
{
saveRestoreDataGridContextStateVisitor.SaveState( ( IDataGridContextVisitable )dataGridContext );
m_dataGridContextsStateDictionary.Add( weakDataGridContextKey, saveRestoreDataGridContextStateVisitor );
Debug.WriteLineIf( this.DebugSaveRestore, "SAVING DataGridContext state for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() + " SAVED!" );
}
catch
{
Debug.WriteLineIf( this.DebugSaveRestore, "SAVING DataGridContext state for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() + " FAILED!" );
}
}
finally
{
dataGridContext.IsSavingState = false;
}
}
