private void UpdateSortDefinitions(DataGridColumn updatedColumn)
{
// Not nullable, check if there already is a sort description for that column.
if (_sortDescriptions.Any(i => i.PropertyName == updatedColumn.SortMemberPath))
{
// Get the description.
var columnSortDescription =
_sortDescriptions.FirstOrDefault(i => i.PropertyName == updatedColumn.SortMemberPath);
var columnSortDirection = updatedColumn.SortDirection;
// Always remove from definitions, updating value throws an exception.
_sortDescriptions.Remove(columnSortDescription);
// If there is a direction, add the new value.
if (columnSortDirection != null)
{
_sortDescriptions.Add(
new SortDescription(updatedColumn.SortMemberPath, GetSortDirection(updatedColumn)));
}
}
// Add column to definitions.
else
{
_sortDescriptions.Add(
new SortDescription(updatedColumn.SortMemberPath, GetSortDirection(updatedColumn)));
}
UpdateColumnSortDefinitions();
}
private static void ApplyColumnSort( DataGridContext dataGridContext, SortDescriptionCollection sortDescriptions, ColumnCollection columns, ColumnBase column, SortDirection sortDirection )
{
if( column == null )
throw new ArgumentNullException( "column" );
Debug.Assert( ( dataGridContext != null ) || ( column.ParentDetailConfiguration != null ) );
if( ( dataGridContext == null ) && ( column.ParentDetailConfiguration == null ) )
throw new DataGridInternalException( "DataGridContext or ParentDetailConfiguration cannot be null." );
if( !columns.Contains( column ) )
throw new ArgumentException( "The specified column is not part of the DataGridContext.", "column" );
string fieldName = column.FieldName;
bool canSort = ( dataGridContext != null ) ? dataGridContext.Items.CanSort : true;
if( ( !string.IsNullOrEmpty( fieldName ) ) && ( canSort == true ) )
{
SortDescription existingSort;
int sortDescriptionIndex = sortDescriptions.Count;
for( int i = sortDescriptions.Count - 1; i >= 0; i-- )
{
existingSort = sortDescriptions[ i ];
if( existingSort.PropertyName == fieldName )
{
if( ( ( existingSort.Direction == ListSortDirection.Ascending ) && ( sortDirection == SortDirection.Ascending ) ) ||
( ( existingSort.Direction == ListSortDirection.Descending ) && ( sortDirection == SortDirection.Descending ) ) )
{
// Nothing to change!
sortDescriptionIndex = -1;
}
else
{
sortDescriptionIndex = i;
sortDescriptions.Remove( existingSort );
}
break;
}
}
int maxDescriptions = ( dataGridContext != null ) ? dataGridContext.MaxSortLevels
: column.ParentDetailConfiguration.MaxSortLevels;
if( ( maxDescriptions != -1 ) && ( sortDescriptions.Count >= maxDescriptions ) )
{
// Cannot insert sort description since it would go beyond the max sort description count.
sortDescriptionIndex = -1;
sortDirection = SortDirection.None;
}
if( ( sortDescriptionIndex > -1 ) && ( sortDirection != SortDirection.None ) )
{
SortDescription sortDescription = new SortDescription( fieldName,
( sortDirection == SortDirection.Ascending ) ? ListSortDirection.Ascending : ListSortDirection.Descending );
sortDescriptions.Insert( sortDescriptionIndex, sortDescription );
column.SetSortIndex( sortDescriptionIndex );
column.SetSortDirection( sortDirection );
}
SortingHelper.SynchronizeSortIndexes( sortDescriptions, columns );
}
}
private static void ApplyColumnSort(DataGridContext dataGridContext, SortDescriptionCollection sortDescriptions, ColumnCollection columns, ColumnBase column, SortDirection sortDirection)
{
if (column == null)
{
throw new ArgumentNullException("column");
}
Debug.Assert((dataGridContext != null) || (column.ParentDetailConfiguration != null));
if ((dataGridContext == null) && (column.ParentDetailConfiguration == null))
{
throw new DataGridInternalException("DataGridContext or ParentDetailConfiguration cannot be null.");
}
if (!columns.Contains(column))
{
throw new ArgumentException("The specified column is not part of the DataGridContext.", "column");
}
string fieldName = column.FieldName;
bool canSort = (dataGridContext != null) ? dataGridContext.Items.CanSort : true;
if ((!string.IsNullOrEmpty(fieldName)) && (canSort == true))
{
SortDescription existingSort;
int sortDescriptionIndex = sortDescriptions.Count;
for (int i = sortDescriptions.Count - 1; i >= 0; i--)
{
existingSort = sortDescriptions[i];
if (existingSort.PropertyName == fieldName)
{
if (((existingSort.Direction == ListSortDirection.Ascending) && (sortDirection == SortDirection.Ascending)) ||
((existingSort.Direction == ListSortDirection.Descending) && (sortDirection == SortDirection.Descending)))
{
// Nothing to change!
sortDescriptionIndex = -1;
}
else
{
sortDescriptionIndex = i;
sortDescriptions.Remove(existingSort);
}
break;
}
}
int maxDescriptions = (dataGridContext != null) ? dataGridContext.MaxSortLevels
: column.ParentDetailConfiguration.MaxSortLevels;
if ((maxDescriptions != -1) && (sortDescriptions.Count >= maxDescriptions))
{
// Cannot insert sort description since it would go beyond the max sort description count.
sortDescriptionIndex = -1;
sortDirection = SortDirection.None;
}
if ((sortDescriptionIndex > -1) && (sortDirection != SortDirection.None))
{
SortDescription sortDescription = new SortDescription(fieldName,
(sortDirection == SortDirection.Ascending) ? ListSortDirection.Ascending : ListSortDirection.Descending);
sortDescriptions.Insert(sortDescriptionIndex, sortDescription);
column.SetSortIndex(sortDescriptionIndex);
column.SetSortDirection(sortDirection);
}
SortingHelper.SynchronizeSortIndexes(sortDescriptions, columns);
}
}