internal void OnQueryAutoFilterDistinctValues(QueryAutoFilterDistinctValuesEventArgs e)
{
if (this.QueryAutoFilterDistinctValues != null)
{
this.QueryAutoFilterDistinctValues(this, e);
}
}
internal void OnQueryAutoFilterDistinctValues(QueryAutoFilterDistinctValuesEventArgs e)
{
if (this.QueryAutoFilterDistinctValues != null)
{
this.QueryAutoFilterDistinctValues(this, e);
}
DataGridVirtualizingCollectionViewSource source = this.ParentCollectionViewSourceBase as DataGridVirtualizingCollectionViewSource;
if (source != null)
{
source.OnQueryAutoFilterDistinctValues(e);
}
}
internal override void RefreshDistinctValuesForField(DataGridItemPropertyBase dataGridItemProperty)
{
if (dataGridItemProperty == null)
{
return;
}
if (dataGridItemProperty.CalculateDistinctValues == false)
{
return;
}
// List containing current column distinct values
HashSet <object> currentColumnDistinctValues = new HashSet <object>();
ReadOnlyObservableHashList readOnlyColumnDistinctValues = null;
// If the key is not set in DistinctValues yet, do not calculate distinct values for this field
if (!(( DistinctValuesDictionary )this.DistinctValues).InternalTryGetValue(dataGridItemProperty.Name, out readOnlyColumnDistinctValues))
{
return;
}
ObservableHashList columnDistinctValues = readOnlyColumnDistinctValues.InnerObservableHashList;
// We use the DistinctValuesSortComparer if present, else the SortComparer for the DataGridItemProperty, else,
// the Comparer used is the one of the base class.
IComparer distinctValuesSortComparer = dataGridItemProperty.DistinctValuesSortComparer;
if (distinctValuesSortComparer == null)
{
distinctValuesSortComparer = dataGridItemProperty.SortComparer;
}
using (columnDistinctValues.DeferINotifyCollectionChanged())
{
QueryAutoFilterDistinctValuesEventArgs e = new QueryAutoFilterDistinctValuesEventArgs(dataGridItemProperty);
this.OnQueryAutoFilterDistinctValues(e);
foreach (object distinctValue in e.DistinctValues)
{
// Compute current value to be able to remove unused values
currentColumnDistinctValues.Add(distinctValue);
}
DataGridCollectionViewBase.RemoveUnusedDistinctValues(
distinctValuesSortComparer, currentColumnDistinctValues, columnDistinctValues, null);
}
}