void SearchBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
// TODO: focus on next element
if (e.Key == Key.Down && listBox.ItemCount > 0)
{
e.Handled = true;
DirectionalNavigation.GetNext(listBox, NavigationDirection.First).Focus();
//listBox.MoveFocus(new TraversalRequest(FocusNavigationDirection.First));
listBox.SelectedIndex = 0;
}
}
/// <summary>
/// Gets the next control in the specified navigation direction.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="direction">The navigation direction.</param>
/// <returns>
/// The next element in the specified direction, or null if <paramref name="element"/>
/// was the last in therequested direction.
/// </returns>
public static IInputElement GetNext(
IInputElement element,
FocusNavigationDirection direction)
{
Contract.Requires <ArgumentNullException>(element != null);
if (direction == FocusNavigationDirection.Next || direction == FocusNavigationDirection.Previous)
{
return(TabNavigation.GetNextInTabOrder(element, direction));
}
else
{
return(DirectionalNavigation.GetNext(element, direction));
}
}
/// <summary>
/// Gets the next control in the specified navigation direction.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="direction">The navigation direction.</param>
/// <returns>
/// The next element in the specified direction, or null if <paramref name="element"/>
/// was the last in therequested direction.
/// </returns>
public static IInputElement GetNext(
IInputElement element,
NavigationDirection direction)
{
Contract.Requires <ArgumentNullException>(element != null);
var customHandler = element.GetSelfAndVisualAncestors()
.OfType <ICustomKeyboardNavigation>()
.FirstOrDefault();
if (customHandler != null)
{
var(handled, next) = customHandler.GetNext(element, direction);
if (handled)
{
if (next != null)
{
return(next);
}
else if (direction == NavigationDirection.Next || direction == NavigationDirection.Previous)
{
return(TabNavigation.GetNextInTabOrder((IInputElement)customHandler, direction, true));
}
else
{
return(null);
}
}
}
if (direction == NavigationDirection.Next || direction == NavigationDirection.Previous)
{
return(TabNavigation.GetNextInTabOrder(element, direction));
}
else
{
return(DirectionalNavigation.GetNext(element, direction));
}
}