// Helper method that ensures that the element marked as IsSelected also has focus.
// If it cannot receive focus, we look for its closest visual child that can
//
private void SynchronizeSelectionFocus(StealFocusMode focusMode)
{
// Is there something to select?
if (_selection == null)
{
return;
}
// Are we even allowed to mess around with focus or does someone else on the
// design surface have focus right now and we should just let them have it?
if (focusMode == StealFocusMode.OnlyIfCategoryListHasFocusWithin && !this.IsKeyboardFocusWithin)
{
return;
}
if (focusMode == StealFocusMode.OnlyIfCurrentSelectionDoesNotHaveFocusWithin && _selection.IsKeyboardFocusWithin)
{
return;
}
FrameworkElement focusableElement = VisualTreeUtils.FindFocusableElement <FrameworkElement>(_selection);
if (focusableElement != null)
{
focusableElement.Focus();
}
}
// Find the closest IsSelectable parent, select it and set focus on it.
//
private void SelectAndFocus(DependencyObject element, StealFocusMode focusMode)
{
Select(element);
SynchronizeSelectionFocus(focusMode);
}
