private void AssociatedObject_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (!AutoCompletePopup.IsOpen)
{
return;
}
bool close = false;
switch (e.Key)
{
case Key.Escape:
close = true;
break;
case Key.Return:
InsertText();
close = true;
break;
case Key.Up:
AutoCompleteBox.SelectedIndex--;
e.Handled = true;
break;
case Key.Down:
AutoCompleteBox.SelectedIndex++;
e.Handled = true;
break;
case Key.Back:
if (FilterText.Length > 0)
{
FilterText = FilterText.Substring(0, FilterText.Length - 1);
}
else
{
close = true;
}
break;
}
int itemCount = FilteredItems.Count();
if (AutoCompleteBox.SelectedIndex < 0)
{
AutoCompleteBox.SelectedIndex = itemCount - 1;
}
if (AutoCompleteBox.SelectedIndex >= itemCount)
{
AutoCompleteBox.SelectedIndex = 0;
}
if (close)
{
e.Handled = true;
CloseAutoCompleteBox();
}
}