protected IDisposable DeferResortHelper(
IEnumerable itemsSourceCollection,
CollectionView collectionView)
{
var dataGridCollectionView = itemsSourceCollection as DataGridCollectionViewBase;
if (dataGridCollectionView != null)
{
return(dataGridCollectionView.DataGridSortDescriptions.DeferResort());
}
ColumnSortCommand.ThrowIfNull(collectionView, "collectionView");
return(collectionView.DeferRefresh());
}
protected void SynchronizeColumnSort(
SynchronizationContext synchronizationContext,
SortDescriptionCollection sortDescriptions,
ColumnCollection columns)
{
ColumnSortCommand.ThrowIfNull(synchronizationContext, "synchronizationContext");
ColumnSortCommand.ThrowIfNull(sortDescriptions, "sortDescriptions");
ColumnSortCommand.ThrowIfNull(columns, "columns");
if (!synchronizationContext.Own || !columns.Any())
{
return;
}
this.SetResortCallback(sortDescriptions, columns);
int count = sortDescriptions.Count;
Dictionary <string, ColumnSortInfo> sortOrder = new Dictionary <string, ColumnSortInfo>(count);
for (int i = 0; i < count; i++)
{
var sortDescription = sortDescriptions[i];
string propertyName = sortDescription.PropertyName;
if (sortOrder.ContainsKey(propertyName))
{
continue;
}
sortOrder.Add(propertyName, new ColumnSortInfo(i, sortDescription.Direction));
}
foreach (var column in columns)
{
ColumnSortInfo entry;
if (sortOrder.TryGetValue(column.FieldName, out entry))
{
column.SetSortIndex(entry.Index);
column.SetSortDirection(entry.Direction);
}
else
{
column.SetSortIndex(-1);
column.SetSortDirection(SortDirection.None);
}
}
}
