void OnEnable()
{
var styleSheet = AssetDatabase.LoadAssetAtPath <StyleSheet>(_styleSheetPath);
var uxml = AssetDatabase.LoadAssetAtPath <VisualTreeAsset>(_uxmlPath);
uxml.CloneTree(rootVisualElement);
rootVisualElement.styleSheets.Add(styleSheet);
_back = rootVisualElement.Query <Button>("back");
_back.clickable.clicked += HistoryList.MoveBack;
_back.SetEnabled(HistoryList.CanMoveBack());
_forward = rootVisualElement.Query <Button>("forward");
_forward.clickable.clicked += HistoryList.MoveForward;
_forward.SetEnabled(HistoryList.CanMoveForward());
_listView = rootVisualElement.Query <ListView>().First();
_listView.selectionType = SelectionType.Single;
_listView.itemsSource = HistoryList.History;
_listView.makeItem = MakeItem;
_listView.bindItem = BindItem;
_listView.onItemChosen += item => Select();
_listView.onSelectionChanged += selection => Highlight();
Selection.selectionChanged += Refresh;
}
private void Refresh()
{
_back.SetEnabled(HistoryList.CanMoveBack());
_forward.SetEnabled(HistoryList.CanMoveForward());
_listView.Refresh();
}