private void RefreshFilteredItems()
{
if (_collectionView == null)
return;
IFilterCommand filterCommand = GetMatchingFilterCommand();
if (filterCommand != null)
{
if (filterCommand != _activeFilterCommand) // Set the new filter command.
{
_activeFilterCommand = filterCommand;
_collectionView.Filter = GetMatchStrategy(filterCommand);
}
}
else if (_activeFilterCommand != null) // Remove the filter command and reset the filter strategy.
{
_activeFilterCommand = null;
_collectionView.Filter = GetMatchStrategy(FilterStrategy);
}
var items = _collectionView.Cast<object>();
var itemsList = new List<object>(items);
FilteredItems = itemsList;
_filteredItemsPopup.IsOpen = itemsList.Count > 0;
}
private Predicate<object> GetMatchStrategy(IFilterCommand filterCommand)
{
return o =>
{
var text = _textBox.Text.Replace(filterCommand.CommandText, "").Trim();
return text.Length > 0 &&
filterCommand.IsMatch(o, text);
};
}
public FilterRepository(IFilterCommand filterCommand, IFilterQuery filterQuery)
{
_filterCommand = filterCommand;
_filterQuery = filterQuery;
}