private void ExecutePreviewKeyDown(KeyEventArgs kea)
{
if (kea.Key == Key.Enter && _unfrozenText.Length > 0)
{
bool add = true;
foreach (var fe in FilterCriteria)
{
if (fe.FrozenText.Equals(_unfrozenText))
{
add = false;
}
}
if (add)
{
FilterCriteria.Add(new FilterCriteriaVM(_unfrozenText, _filterCritera));
}
UnfrozenText = "";
}
else if (kea.Key == Key.Back && CaretPosition == 0)
{
if (FilterCriteria.Any())
{
FilterCriteriaVM fe = FilterCriteria[FilterCriteria.Count() - 1];
FilterCriteria.RemoveAt(FilterCriteria.Count() - 1);
UnfrozenText = fe.FrozenText + _unfrozenText;
CaretPosition = _unfrozenText.Length;
}
}
}