public override void Execute(object parameter)
{
base.Execute(parameter);
ColumnHeaderTapContext context = parameter as ColumnHeaderTapContext;
string columnHeader = context.Column.Header.ToString();
RadDataGrid grid = this.Owner as RadDataGrid;
if (context.Column.SortDirection == SortDirection.None)
{
grid.SortDescriptors.Clear();
grid.SortDescriptors.Add(new DelegateSortDescriptor {
KeyLookup = new CustomIKeyLookup()
{
GroupHeaderName = columnHeader
}, SortOrder = SortOrder.Ascending
});
context.Column.SortDirection = SortDirection.Ascending;
}
else if (context.Column.SortDirection == SortDirection.Ascending)
{
grid.SortDescriptors.Clear();
grid.SortDescriptors.Add(new DelegateSortDescriptor {
KeyLookup = new CustomIKeyLookup()
{
GroupHeaderName = columnHeader
}, SortOrder = SortOrder.Descending
});
context.Column.SortDirection = SortDirection.Descending;
}
else
{
grid.SortDescriptors.Clear();
context.Column.SortDirection = SortDirection.None;
}
}
internal ColumnHeaderTapContext GenerateColumnHeaderTapContext(DataGridColumn column, PointerDeviceType deviceType)
{
bool multiple = false;
bool canSort = column.CanSort;
if (canSort)
{
switch (this.UserSortMode)
{
case DataGridUserSortMode.Auto:
if (deviceType == PointerDeviceType.Touch)
{
multiple = true;
}
else
{
multiple = KeyboardHelper.IsModifierKeyDown(VirtualKey.Control);
}
break;
case DataGridUserSortMode.Multiple:
multiple = true;
break;
case DataGridUserSortMode.None:
canSort = false;
break;
}
}
var context = new ColumnHeaderTapContext()
{
Column = column,
CanSort = canSort,
IsMultipleSortAllowed = multiple
};
return(context);
}
