/// <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 the requested direction.
/// </returns>
public static IInputElement?GetNext(
IInputElement element,
NavigationDirection direction)
{
element = element ?? throw new ArgumentNullException(nameof(element));
// If there's a custom keyboard navigation handler as an ancestor, use that.
var custom = element.FindAncestorOfType <ICustomKeyboardNavigation>(true);
if (custom is object && HandlePreCustomNavigation(custom, element, direction, out var ce))
{
return(ce);
}
var result = direction switch
{
NavigationDirection.Next => TabNavigation.GetNextTab(element, false),
NavigationDirection.Previous => TabNavigation.GetPrevTab(element, null, false),
_ => throw new NotSupportedException(),
};
// If there wasn't a custom navigation handler as an ancestor of the current element,
// but there is one as an ancestor of the new element, use that.
if (custom is null && HandlePostCustomNavigation(element, result, direction, out ce))
{
return(ce);
}
return(result);
}
