private static bool HandlePreCustomNavigation(
ICustomKeyboardNavigation customHandler,
IInputElement element,
NavigationDirection direction,
[NotNullWhen(true)] out IInputElement?result)
{
if (customHandler != null)
{
var(handled, next) = customHandler.GetNext(element, direction);
if (handled)
{
if (next != null)
{
result = next;
return(true);
}
else if (direction == NavigationDirection.Next || direction == NavigationDirection.Previous)
{
var r = direction switch
{
NavigationDirection.Next => TabNavigation.GetNextTabOutside(customHandler),
NavigationDirection.Previous => TabNavigation.GetPrevTabOutside(customHandler),
_ => throw new NotSupportedException(),
};
if (r is object)
{
result = r;
return(true);
}
}
}
}
result = null;
return(false);
}
