层次,wrappable(当容器宽度比长度变小的菜单),鼠标悬停和tab键驱动的菜单栏。最初创建代表选中项的路径在树形视图。 -Hierarchical, wrappable (when container width gets smaller than the menu length), mouse-hover and Tab-key driven menu bar. Originally created to represent a path to the selected item i