/// <summary>
/// Select/unselect a node.
/// All parent nodes up to root must already be expanded.
/// Otherwise there is no effect.
/// </summary>
/// <param name="data">The data that the target node contains</param>
/// <param name="selected">true: select the node; false: unselect the node</param>
public void SelectItem(object data, bool selected)
{
int index;
TreeGridViewItemInfo info = this.FindItemInfoForData(data, out index);
if (info != null)
{
this.ScrollIntoView(info);
this.Dispatcher.BeginInvoke(
(Action)(() =>
{
TreeGridViewItem container = this.ItemContainerGenerator.ContainerFromIndex(index) as TreeGridViewItem;
if (container != null)
{
container.IsSelected = selected;
}
}),
System.Windows.Threading.DispatcherPriority.Background);
}
}
// Callback function for IsExpanded dependency property
// all it does is to ask parent view to expand/collapse the item accordingly
private static void OnIsExpandedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TreeGridViewItem container = (TreeGridViewItem)d;
var info = container.DataContext as TreeGridViewItemInfo;
bool oldValue = (bool)e.OldValue;
bool newValue = (bool)e.NewValue;
if (oldValue == false && newValue == true)
{
if (container.ParentView != null && info != null)
{
container.ParentView.ExpandItem(info.Data);
}
}
else if (oldValue == true && newValue == false)
{
if (container.ParentView != null && info != null)
{
container.ParentView.CollapseItem(info.Data);
}
}
}
/// <summary>
/// Called by an item to notify the view when it gets focus
/// The view has to know the currently focused item
/// </summary>
/// <param name="childItem">the child item got focus</param>
internal void NotifyItemGotFocus(TreeGridViewItem childItem)
{
this.focusItemInfo = this.ItemContainerGenerator.ItemFromContainer(childItem) as TreeGridViewItemInfo;
// clear the pending focus restore since a new focus is set by user
this.restoreFocusItemInfo = null;
}