//event handler for the GridViewColumnHeader click
private static void OnColumnHeaderClicked(object sender, RoutedEventArgs e)
{
ListView view = sender as ListView;
if (view == null)
{
return;
}
GridViewSortHandler handler = view.GetValue(GridViewSortHandlerProperty) as GridViewSortHandler;
if (handler == null)
{
return;
}
//set the parent control of the handler
handler.parentControl = view;
handler.comparer = view.GetValue(CustomComparerProperty) as GridViewCustomComparer;
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 (sortableGridViewColumn.CanSort)
{
handler.ApplySort(sortableGridViewColumn);
}
}
}
//registers to the column click of the header to apply the sort
private static void RegisterSortHandler(DependencyObject obj,
DependencyPropertyChangedEventArgs args)
{
ListView grid = obj as ListView;
if (grid == null)
{
return;
}
GridViewSortHandler handler = args.NewValue as GridViewSortHandler;
if (handler != null)
{
//register to click events of column header
grid.AddHandler(GridViewColumnHeader.ClickEvent,
columnClickhandler);
}
}
/// <summary>
/// Sets the value GridViewSortable on the specified object
/// </summary>
/// <param name="obj">The object to store the value of the property</param>
/// <param name="value">The value to set</param>
public static void SetGridViewSortHandler(DependencyObject obj, GridViewSortHandler value)
{
obj.SetValue(GridViewSortHandlerProperty, value);
}
/// <summary>
/// Sets the value GridViewSortable on the specified object
/// </summary>
/// <param name="obj">The object to store the value of the property</param>
/// <param name="value">The value to set</param>
public static void SetGridViewSortHandler(DependencyObject obj, GridViewSortHandler value)
{
obj.SetValue(GridViewSortHandlerProperty, value);
}