/// <summary>
/// Event Handler for the ColumnHeader Click Event.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void GridViewColumnHeaderClickedHandler(object sender, RoutedEventArgs e)
{
GridViewColumnHeader headerClicked = e.OriginalSource as GridViewColumnHeader;
// ensure that we clicked on the column header and not the padding that's added to fill the space.
if (headerClicked != null && headerClicked.Role != GridViewColumnHeaderRole.Padding)
{
// attempt to cast to the sortableGridViewColumn object.
SortableGridViewColumn sortableGridViewColumn = (headerClicked.Column) as SortableGridViewColumn;
if (_curSortCol != null)
{
AdornerLayer.GetAdornerLayer(_curSortCol).Remove(_curAdorner);
}
// ensure that the column header is the correct type and a sort property has been set.
if (sortableGridViewColumn != null && !String.IsNullOrEmpty(sortableGridViewColumn.SortPropertyName))
{
ListSortDirection direction;
// determine if this is a new sort, or a switch in sort direction.
if (_lastSortedOnColumn == null ||
String.IsNullOrEmpty(_lastSortedOnColumn.SortPropertyName) ||
!String.Equals(sortableGridViewColumn.SortPropertyName, _lastSortedOnColumn.SortPropertyName, StringComparison.InvariantCultureIgnoreCase))
{
direction = ListSortDirection.Ascending;
}
else
{
direction = (_lastSortDirection == ListSortDirection.Ascending) ? ListSortDirection.Descending : ListSortDirection.Ascending;
}
Cursor oldCursor = Cursor;
try
{
Cursor = Cursors.Wait;
FirePreviewSortCompletedEvent( );
Sort(sortableGridViewColumn.SortPropertyName, direction);
SetAdorner(headerClicked, direction);
FireSortCompletedEvent( );
}
finally
{
Cursor = oldCursor;
}
_lastSortedOnColumn = sortableGridViewColumn;
}
}
}
/// <summary>
/// Executes when the control is initialized completely the first time through. Runs only once.
/// </summary>
/// <param name="e"></param>
protected override void OnInitialized(EventArgs e)
{
// add the event handler to the GridViewColumnHeader. This strongly ties this ListView to a GridView.
this.AddHandler(GridViewColumnHeader.ClickEvent, new RoutedEventHandler(GridViewColumnHeaderClickedHandler));
// cast the ListView's View to a GridView
GridView gridView = this.View as GridView;
if (gridView != null)
{
// determine which column is marked as IsDefaultSortColumn. Stops on the first column marked this way.
SortableGridViewColumn sortableGridViewColumn = null;
foreach (GridViewColumn gridViewColumn in gridView.Columns)
{
sortableGridViewColumn = gridViewColumn as SortableGridViewColumn;
if (sortableGridViewColumn != null)
{
if (sortableGridViewColumn.IsDefaultSortColumn)
{
break;
}
sortableGridViewColumn = null;
}
}
// if the default sort column is defined, sort the data and then update the templates as necessary.
//if( sortableGridViewColumn != null )
//{
// lastSortedOnColumn = sortableGridViewColumn;
// Sort( sortableGridViewColumn.SortPropertyName, ListSortDirection.Ascending );
// GridViewColumnHeader header = (GridViewColumnHeader)sortableGridViewColumn;
// SetAdorner( header, ListSortDirection.Ascending );
//if( !String.IsNullOrEmpty( this.ColumnHeaderSortedAscendingTemplate ) )
//{
// sortableGridViewColumn.HeaderTemplate = this.TryFindResource( ColumnHeaderSortedAscendingTemplate ) as DataTemplate;
//}
// this.SelectedIndex = 0;
// }
}
base.OnInitialized(e);
}
