/// Gets the sorting direction of the header clicked.
private static ListSortDirection GetSortingDirection(GridViewColumnHeader headerClicked, ListViewSortItem listViewSortItem)
{
if (headerClicked != listViewSortItem.LastColumnHeaderClicked)
{
return(ListSortDirection.Ascending);
}
else
{
return((listViewSortItem.LastSortDirection == ListSortDirection.Ascending) ? ListSortDirection.Descending : ListSortDirection.Ascending);
}
}
/// Grids the view column header clicked handler.
public static void GridViewColumnHeaderClickedHandler(Object sender, RoutedEventArgs e)
{
System.Windows.Controls.ListView view = sender as System.Windows.Controls.ListView;
if (view == null)
{
return;
}
if (_listViewDefinitions == null)
{
return;
}
ListViewSortItem listViewSortItem = (_listViewDefinitions.ContainsKey(view.Name)) ? _listViewDefinitions[view.Name] : null;
if (listViewSortItem == null)
{
return;
}
GridViewColumnHeader headerClicked = e.OriginalSource as GridViewColumnHeader;
if (headerClicked == null)
{
return;
}
ListCollectionView collectionView = CollectionViewSource.GetDefaultView(view.ItemsSource) as ListCollectionView;
if (collectionView == null)
{
return;
}
ListSortDirection sortDirection = GetSortingDirection(headerClicked, listViewSortItem);
// get header name
String header = headerClicked.Column.Header as string;
if (String.IsNullOrEmpty(header))
{
return;
}
// sort listview
if (listViewSortItem.Comparer != null)
{
listViewSortItem.Comparer.SortBy = header;
listViewSortItem.Comparer.SortDirection = sortDirection;
collectionView.CustomSort = listViewSortItem.Comparer;
view.Items.Refresh();
}
else
{
view.Items.SortDescriptions.Clear();
view.Items.SortDescriptions.Add(new SortDescription(headerClicked.Column.Header.ToString(), sortDirection));
view.Items.Refresh();
}
// change datatemplate of previous and current column header
headerClicked.Column.HeaderTemplate = GetHeaderColumnsDataTemplate(view, listViewSortItem, sortDirection);
// Set current sort values as last sort values
listViewSortItem.LastColumnHeaderClicked = headerClicked;
listViewSortItem.LastSortDirection = sortDirection;
}
/// Gets the header columns data template.
private static DataTemplate GetHeaderColumnsDataTemplate(System.Windows.Controls.ListView view, ListViewSortItem listViewSortItem, ListSortDirection sortDirection)
{
// remove mark from previous sort column
if (listViewSortItem.LastColumnHeaderClicked != null)
{
listViewSortItem.LastColumnHeaderClicked.Column.HeaderTemplate = view.TryFindResource("ListViewHeaderTemplateNoSorting") as DataTemplate;
}
// set correct mark to current column
switch (sortDirection)
{
case ListSortDirection.Ascending:
return(view.TryFindResource("ListViewHeaderTemplateAscendingSorting") as DataTemplate);
case ListSortDirection.Descending:
return(view.TryFindResource("ListViewHeaderTemplateDescendingSorting") as DataTemplate);
default:
return(null);
}
}
