//Since the ColumnFilterHeader control is defined in the headerStyle for the grid, we can only get a reference to it once it loads. We
//then we have to find the column that the ColumnFilterHeader is associated with. We do this by comparing the Header
//and HeaderContent for each column.
private void ColumnFilterHeader_Loaded(object sender, RoutedEventArgs e)
{
var header = sender as ColumnFilterControl;
if (!FilterHeaders.Any())
{
if (header != null)
{
header.TxtFilter.Focus();
}
}
FilterHeaders.Add(header);
if (header != null && header.HeaderContent != null)
{
var column = Columns.FirstOrDefault(c => c.Header != null && c.Header.ToString() == header.HeaderContent.ToString());
header.Column = column;
header.Grid = this;
header.PropertyChanged += header_PropertyChanged;
if (FilterType != null)
{
header.ResetFilterValues(CreateFilterColumnInfo(column));
}
}
}
//Each time any ColumnFilterHeader values change. We need to generate the new predicate for the PagedCollectionView
private void header_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
var view = ItemsSource as PagedCollectionView;
Predicate <object> predicate = null;
foreach (var filter in FilterHeaders.Where(x => x.HasPredicate))
{
predicate = predicate == null
? filter.GeneratePredicate()
: predicate.And(filter.GeneratePredicate());
}
CommitEdit();
if (view != null)
{
view.Filter = predicate;
}
}
public void FireFilter()
{
OnFilter(this, new FilterEvent {
FiltersPredicate = FilterHeaders.Where(x => x.HasPredicate)
});
}