public virtual void DisplayCurrentSortStates()
{
GridViewColumnCollection columns = GridViewDataControl.Columns;
ISet <GridViewBoundColumnBase> unmatchedColumns = new IdentityHashSet <GridViewBoundColumnBase>();
foreach (GridViewBoundColumnBase column in columns)
{
unmatchedColumns.Add(column);
}
foreach (AmbethSortDescriptor sortDescriptor in SortDescriptorList)
{
foreach (GridViewBoundColumnBase column in columns)
{
if (column.GetDataMemberName() == sortDescriptor.Member)
{
column.SortingState = SortDescriptorConverter.GetTelerikSortingState(sortDescriptor);
unmatchedColumns.Remove(column);
break;
}
}
}
foreach (GridViewBoundColumnBase unmatchedColumn in unmatchedColumns)
{
unmatchedColumn.SortingState = SortingState.None;
}
}
public virtual void ControlSorting(Object sender, GridViewSortingEventArgs e)
{
// Sorting happens on server-side, hence the the own sorting of the UIControl must be
// canceled and therefore, the SortingStates must be switched manually here.
if (e.OldSortingState == SortingState.None)
{
e.NewSortingState = SortingState.Ascending;
}
else if (e.OldSortingState == SortingState.Ascending)
{
e.NewSortingState = SortingState.Descending;
}
else if (e.OldSortingState == SortingState.Descending)
{
e.NewSortingState = SortingState.None;
}
List <ISortDescriptor> sortDescriptorList = new List <ISortDescriptor>();
bool modifiedOrRemoved = false;
// Not only the EventArgs, but all SortDescriptors set on the Control must be evaluated.
// (E.g. in a RadGridView, the user can specify multiple descriptors by holding the shift key)
// As the Controls own sorting is canceled, the descriptors are not directly available from the
// sender and must be tracked manually.
if (!e.IsMultipleColumnSorting)
{
if (SortDescriptorList.Count > 0)
{
SortDescriptorList.Clear();
modifiedOrRemoved = true;
}
}
// The MemberName of the property to sort is currently still available as SortPropertyName in the
// EventArgs, but it is marked as obsolet and thus removed in future versions. Therefore the PropertyName
// will be evaluated by casting the the Column to a GridViewBoundColumnBase and calling its
// GetDataMemberName() method.
String sortPropertyName = ((GridViewBoundColumnBase)e.Column).GetDataMemberName();
AmbethISortDescriptor ambethDescriptor = SortDescriptorConverter.ConvertTelerikSortingState(e.NewSortingState, sortPropertyName);
foreach (AmbethSortDescriptor sortDescriptor in SortDescriptorList)
{
if (sortDescriptor.Member != sortPropertyName)
{
continue;
}
if (ambethDescriptor != null)
{
sortDescriptor.SortDirection = ambethDescriptor.SortDirection;
ambethDescriptor = null;
}
else
{
SortDescriptorList.Remove(sortDescriptor); // OK to remove directly, because break is following
}
modifiedOrRemoved = true;
break;
}
if (ambethDescriptor != null)
{
SortDescriptorList.Add(ambethDescriptor);
modifiedOrRemoved = true;
}
if (modifiedOrRemoved)
{
OnPropertyChanged("SortDescriptorList");
}
// As sorting is canceled for the control, the status of all other descriptors must be reset manually:
//DisplayCurrentSortStates();
e.Cancel = true; // Prevent the UIControl from own sorting
}