/// <summary>
/// Attempts to navigate focus in the specified direction.
/// </summary>
/// <param name="view">The view for which to perform navigation.</param>
/// <param name="element">The element at which to begin navigation.</param>
/// <param name="direction">The direction in which to navigate focus.</param>
/// <param name="ctrl">A value indicating whether the Ctrl modifier is active.</param>
/// <returns><c>true</c> if navigation was performed; otherwise, <c>false</c>.</returns>
public static Boolean PerformNavigation(PresentationFoundationView view, UIElement element, FocusNavigationDirection direction, Boolean ctrl)
{
if (!PrepareNavigation(view, ref element, ref direction))
return false;
var navprop = GetNavigationProperty(direction, ctrl);
var navContainer = default(DependencyObject);
var destination = default(IInputElement);
switch (direction)
{
case FocusNavigationDirection.Next:
navContainer = FindNavigationContainer(element, navprop);
destination = FindNextNavigationStop(view, navContainer, element, navprop, false) as IInputElement;
break;
case FocusNavigationDirection.Previous:
navContainer = FindNavigationContainer(element, navprop);
destination = FindPrevNavigationStop(view, navContainer, element, navprop, false) as IInputElement;
break;
case FocusNavigationDirection.First:
destination = FindNextNavigationStop(view, element, null, navprop, true) as IInputElement;
break;
case FocusNavigationDirection.Last:
destination = FindPrevNavigationStop(view, element, null, navprop, true) as IInputElement;
break;
case FocusNavigationDirection.Left:
case FocusNavigationDirection.Right:
case FocusNavigationDirection.Up:
case FocusNavigationDirection.Down:
navContainer = FindNavigationContainer(element, navprop, false);
if (navContainer != null)
{
destination = FindNavigationStopInDirection(view, navContainer, element, navprop, direction) as IInputElement;
}
break;
}
if (destination != null)
{
view.FocusElement(destination);
return true;
}
return false;
}
