internal void AddGroupDropAreaItem(GridColumn column, object direction, bool needToGroup)
{
if (this.Panel != null && this.Panel.Children.ToList <GroupDropAreaItem>().All(item => (item as GroupDropAreaItem).GridColumn.MappingName != column.MappingName) && this.dataGrid.View != null)
{
if (column.MappingName == null)
{
throw new InvalidOperationException("MappingName is necessary for Sorting, Grouping and Filtering");
}
//if the column is dummy, we need to restrict it and avoid to add that column in groupdroparea.
if (!dataGrid.CheckColumnNameinItemProperties(column) && !column.IsUnbound)
{
return;
}
var content = this.CreateGroupDropAreaItem(column);
content.SortDirection = direction;
this.Panel.Children.Add(content);
if (needToGroup)
{
this.dataGrid.GroupBy(column.MappingName, null, null);
}
this.WatermarkTextVisibility = Visibility.Collapsed;
}
else
#if !WPF
{ this.dataGrid.GridColumnDragDropController.reverseAnimationStoryboard.Begin(); }
#else
{ this.dataGrid.GridColumnDragDropController.DraggablePopup.IsOpen = false; }
#endif
}
