private static bool NavigateUsingKeyboard(object element, KeyEventArgs args, Menu menu, Orientation orientation)
{
if (!menu.IsOpened && element is MenuItem)
{
menu.UpdateMenuItemsFlyoutPlacement();
if (args.VirtualKey == VirtualKey.Enter ||
((args.VirtualKey == VirtualKey.Down) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Bottom) ||
((args.VirtualKey == VirtualKey.Up) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Top) ||
((args.VirtualKey == VirtualKey.Left) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Left) ||
((args.VirtualKey == VirtualKey.Right) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Right))
{
menu.SelectedMenuItem.ShowMenu();
return true;
}
if ((args.VirtualKey == VirtualKey.Left && orientation == Orientation.Horizontal) ||
(args.VirtualKey == VirtualKey.Up && orientation == Orientation.Vertical))
{
GetNextMenuItem(menu, -1);
return true;
}
if ((args.VirtualKey == VirtualKey.Right && orientation == Orientation.Horizontal) ||
(args.VirtualKey == VirtualKey.Down && orientation == Orientation.Vertical))
{
GetNextMenuItem(menu, +1);
return true;
}
}
if ((menu._currentFlyoutPlacement == FlyoutPlacementMode.Left &&
args.VirtualKey == VirtualKey.Right) ||
(args.VirtualKey == VirtualKey.Left &&
menu._currentFlyoutPlacement != FlyoutPlacementMode.Left))
{
if (element is MenuFlyoutItem)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, -1).ShowMenu();
return true;
}
if (element is MenuFlyoutSubItem)
{
var menuFlyoutSubItem = (MenuFlyoutSubItem)element;
if (menuFlyoutSubItem.Parent is MenuItem && element == menu._lastFocusElement)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, -1).ShowMenu();
return true;
}
}
}
if ((args.VirtualKey == VirtualKey.Right &&
menu._currentFlyoutPlacement != FlyoutPlacementMode.Left) ||
(args.VirtualKey == VirtualKey.Left &&
menu._currentFlyoutPlacement == FlyoutPlacementMode.Left))
{
if (element is MenuFlyoutItem)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, +1).ShowMenu();
return true;
}
}
return false;
}