/// <summary>
/// Adds a keyboard focus handler for a container.
/// </summary>
/// <param name="container">The container.</param>
protected virtual void AddKeyboardFocusWithinHandler(ExtendedTreeViewItemBase container)
{
RemoveKeyboardFocusWithinHandler();
CurrentlyFocusedContainer = container ?? throw new ArgumentNullException(nameof(container));
CurrentlyFocusedContainer.IsKeyboardFocusWithinChanged += OnIsKeyboardFocusWithinChanged;
}
protected static void OnIsExpandedChanged(DependencyObject modifiedObject, DependencyPropertyChangedEventArgs e)
{
ExtendedTreeViewItemBase ctrl = (ExtendedTreeViewItemBase)modifiedObject;
ctrl.OnIsExpandedChanged(e);
}
/// <summary>
/// Adds a tag to a container.
/// </summary>
/// <param name="container">The container.</param>
protected virtual void TagContainer(ExtendedTreeViewItemBase container)
{
container.SetValue(HasContextMenuOpenPropertyKey, true);
MarkedContainerList.Add(container);
}
/// <summary>
/// Calleds when a container gets the focus.
/// </summary>
/// <param name="container">The container.</param>
public void ContainerGotFocus(ExtendedTreeViewItemBase container)
{
AddKeyboardFocusWithinHandler(container);
}
/// <summary>
/// Checks whether a container is the destination of a drop.
/// </summary>
/// <param name="itemContainer">The container.</param>
/// <returns>True if destination of a drop; otherwise, false.</returns>
public static bool IsDropOver(ExtendedTreeViewItemBase itemContainer)
{
return(itemContainer == DropTargetContainer);
}