static void HandleExecuted_Delete(object sender, ExecutedRoutedEventArgs e)
{
SharpTreeView treeView = (SharpTreeView)sender;
treeView.updatesLocked = true;
int selectedIndex = -1;
try
{
foreach (SharpTreeNode node in treeView.GetTopLevelSelection().ToArray())
{
if (selectedIndex == -1)
{
selectedIndex = treeView.flattener.IndexOf(node);
}
node.Delete();
}
}
finally
{
treeView.updatesLocked = false;
treeView.UpdateFocusedNode(null, Math.Max(0, selectedIndex - 1));
}
}
static void HandleCanExecute_Delete(object sender, CanExecuteRoutedEventArgs e)
{
SharpTreeView treeView = (SharpTreeView)sender;
e.CanExecute = treeView.GetTopLevelSelection().All(node => node.CanDelete());
}
public UpdateLock(SharpTreeView instance)
{
this.instance = instance;
this.instance.updatesLocked = true;
}