private void ContactComboBox_OnPreviewKeyUp(object sender, KeyEventArgs e)
{
if (e.Key == Key.Back || e.Key == Key.Space)
{
ContactComboBox.IsDropDownOpen = true;
var be = ContactComboBox.GetBindingExpression(ComboBox.TextProperty);
be.UpdateSource();
}
if (e.Key == Key.Up && ContactComboBox.IsDropDownOpen)
{
if (ContactComboBox.SelectedIndex != -1)
{
ContactComboBox.SelectedIndex = ContactComboBox.SelectedIndex - 1;
if (ContactComboBox.SelectedIndex == -1)
{
var be = ContactComboBox.GetBindingExpression(ComboBox.TextProperty);
be.UpdateSource();
}
}
}
if (e.Key == Key.Down && ContactComboBox.IsDropDownOpen)
{
if (ContactComboBox.SelectedIndex < ContactComboBox.Items.Count)
{
ContactComboBox.SelectedIndex = ContactComboBox.SelectedIndex + 1;
}
}
}
private void ContactComboBox_OnTextInput(object sender, TextCompositionEventArgs e)
{
ContactComboBox.IsDropDownOpen = true;
var be = ContactComboBox.GetBindingExpression(ComboBox.TextProperty);
be.UpdateSource();
}