protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (e.Handled)
{
return;
}
if (e.Key == Key.Down)
{
DependencyObject element = e.OriginalSource as DependencyObject;
if (element != null)
{
UIElement footerPaneHost = FooterPaneHost;
if (footerPaneHost != null &&
footerPaneHost.IsKeyboardFocusWithin &&
TreeHelper.IsVisualAncestorOf(footerPaneHost, element))
{
DependencyObject nextFocus = RibbonHelper.PredictFocus(element, FocusNavigationDirection.Down);
if (nextFocus == null ||
nextFocus == element)
{
// If the focus is on the last element of footer pane,
// then try moving focus into items pane and then into
// auxiliary pane if needed.
if (ItemsPaneMoveFocus(FocusNavigationDirection.First) ||
AuxiliaryPaneMoveFocus(FocusNavigationDirection.First))
{
e.Handled = true;
}
}
}
}
}
else if (e.Key == Key.Up)
{
UIElement popupChild = _popup.TryGetChild();
if (popupChild != null &&
!popupChild.IsKeyboardFocusWithin)
{
// If the popup does not have focus with in then try moving focus to
// last element of FooterPane and then to the last element of
// auxiliary pane if needed.
if (FooterPaneMoveFocus(FocusNavigationDirection.Last) ||
AuxiliaryPaneMoveFocus(FocusNavigationDirection.Last))
{
e.Handled = true;
}
}
else
{
DependencyObject element = e.OriginalSource as DependencyObject;
if (element != null)
{
UIElement auxilaryPaneHost = AuxiliaryPaneHost;
if (auxilaryPaneHost != null &&
auxilaryPaneHost.IsKeyboardFocusWithin &&
TreeHelper.IsVisualAncestorOf(auxilaryPaneHost, element))
{
DependencyObject nextFocus = RibbonHelper.PredictFocus(element, FocusNavigationDirection.Up);
if (nextFocus == null ||
nextFocus == element)
{
// If the focus is on last first element of auxiliary pane,
// then try moving focus to last element of Items Pane and
// then to last element of FooterPane if needed.
if (ItemsPaneMoveFocus(FocusNavigationDirection.Last) ||
FooterPaneMoveFocus(FocusNavigationDirection.Last))
{
e.Handled = true;
}
}
}
}
}
}
else if (e.Key == Key.Left ||
e.Key == Key.Right)
{
DependencyObject element = e.OriginalSource as DependencyObject;
if (element != null)
{
if ((e.Key == Key.Left) == (FlowDirection == FlowDirection.LeftToRight))
{
UIElement auxilaryPaneHost = AuxiliaryPaneHost;
if (auxilaryPaneHost != null &&
auxilaryPaneHost.IsKeyboardFocusWithin &&
TreeHelper.IsVisualAncestorOf(auxilaryPaneHost, element))
{
// If the effective key is left and the focus is on left most element
// of auxiliary pane, then move focus to nearest element to the left of
// auxiliarypane.
DependencyObject nextFocus = RibbonHelper.PredictFocus(element, FocusNavigationDirection.Last);
if (nextFocus != null &&
!TreeHelper.IsVisualAncestorOf(auxilaryPaneHost, nextFocus))
{
if (RibbonHelper.Focus(nextFocus))
{
e.Handled = true;
}
}
}
}
else if (e.Key == Key.Left)
{
ScrollViewer subMenuScrollViewer = SubMenuScrollViewer;
if (subMenuScrollViewer != null &&
subMenuScrollViewer.IsKeyboardFocusWithin &&
TreeHelper.IsVisualAncestorOf(subMenuScrollViewer, element))
{
// If the flow direction is RightToLeft and the key is Left,
// and the focus is in items pane, move the the focus outside teh
// items pane if needed.
RibbonMenuItem menuItem = element as RibbonMenuItem;
if (menuItem == null)
{
menuItem = TreeHelper.FindVisualAncestor <RibbonMenuItem>(element);
}
if (menuItem != null &&
!menuItem.CanOpenSubMenu)
{
DependencyObject nextFocus = menuItem.PredictFocus(FocusNavigationDirection.Right);
if (nextFocus != null)
{
if (RibbonHelper.Focus(nextFocus))
{
e.Handled = true;
}
}
}
}
}
}
}
base.OnPreviewKeyDown(e);
}