static void SelectedItem_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ComboBoxAdaptor adapter = (ComboBoxAdaptor)d;
if (adapter.ItemsSource != null)
{
//If SelectedItem is changing from the Source (which we can tell by checking if the
//ComboBox.SelectedItem is already set to the new value), trigger Adapt() so that we
//throw out any items that are not in ItemsSource.
object adapterValue = (e.NewValue ?? adapter.NullItem);
object comboboxValue = (adapter.ComboBox.SelectedItem ?? adapter.NullItem);
if (!object.Equals(adapterValue, comboboxValue))
{
adapter.Adapt();
adapter.ComboBox.SelectedItem = e.NewValue;
}
//If the NewValue is not in the CollectionView (and therefore not in the ComboBox)
//trigger an Adapt so that it will be added.
else if (e.NewValue != null && !adapter.CollectionView.Contains(e.NewValue))
{
adapter.Adapt();
}
}
}
static void AllowNull_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ComboBoxAdaptor adapter = (ComboBoxAdaptor)d;
adapter.Adapt();
}
static void ItemsSource_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ComboBoxAdaptor adapter = (ComboBoxAdaptor)d;
adapter.Adapt();
}