/// <summary>
/// Moves keyboard focus the specified number of steps away from the currently focused item.
/// </summary>
/// <param name="step">The number of steps by which to move focus.</param>
private void MoveItemFocus(Int32 step)
{
var selectedContainer = ItemsControlUtil.FindFocusedContainer <ComboBoxItem>(this);
var selectedIndex = (selectedContainer == null) ? -1 : ItemContainers.IndexOf(selectedContainer);
var targetIndex = selectedIndex + step;
if (targetIndex < 0 || targetIndex >= Items.Count)
{
return;
}
var targetContainer = ItemContainers[targetIndex] as UIElement;
if (targetContainer == null)
{
return;
}
targetContainer.Focus();
ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, targetContainer);
}
/// <summary>
/// Selects the item which currently has keyboard focus.
/// </summary>
private void SelectFocusedItem()
{
var container = ItemsControlUtil.FindFocusedContainer <ComboBoxItem>(this);
SelectedIndex = (container == null) ? -1 : ItemContainers.IndexOf(container);
}
