void BindTreeViewItem(VisualElement element, int index)
{
var visualProgressItem = element as VisualProgressItem;
if (visualProgressItem == null)
{
return;
}
var progressItem = m_TreeView.GetItemDataForIndex <Progress.Item>(index);
visualProgressItem.BindItem(progressItem);
var indentLevel = GetIndentationLevel(index);
var rootVE = m_TreeView.GetRootElementForIndex(index);
var isEven = indentLevel % 2 == 0;
rootVE.EnableInClassList("unity-tree-view__item-indent-even", isEven);
rootVE.EnableInClassList("unity-tree-view__item-indent-odd", !isEven);
}