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use Cursive;
use With;
use event::Callback;
use std::rc::Rc;
#[derive(Default, Clone)]
pub struct MenuTree {
pub children: Vec<MenuItem>,
}
#[derive(Clone)]
pub enum MenuItem {
Leaf(String, Callback),
Subtree(String, Rc<MenuTree>),
Delimiter,
}
impl MenuItem {
pub fn label(&self) -> &str {
match *self {
MenuItem::Delimiter => "",
MenuItem::Leaf(ref label, _) |
MenuItem::Subtree(ref label, _) => label,
}
}
pub fn is_delimiter(&self) -> bool {
match *self {
MenuItem::Delimiter => true,
_ => false,
}
}
pub fn is_subtree(&self) -> bool {
match *self {
MenuItem::Subtree(_, _) => true,
_ => false,
}
}
}
impl MenuTree {
pub fn new() -> Self {
Self::default()
}
pub fn clear(&mut self) {
self.children.clear();
}
pub fn insert_delimiter(&mut self, i: usize) {
self.children.insert(i, MenuItem::Delimiter);
}
pub fn add_delimiter(&mut self) {
let i = self.children.len();
self.insert_delimiter(i);
}
pub fn delimiter(self) -> Self {
self.with(|menu| menu.add_delimiter())
}
pub fn add_leaf<S, F>(&mut self, title: S, cb: F)
where S: Into<String>,
F: 'static + Fn(&mut Cursive)
{
let i = self.children.len();
self.insert_leaf(i, title, cb);
}
pub fn insert_leaf<S, F>(&mut self, i: usize, title: S, cb: F)
where S: Into<String>,
F: 'static + Fn(&mut Cursive)
{
let title = title.into();
self.children.insert(i, MenuItem::Leaf(title, Callback::from_fn(cb)));
}
pub fn leaf<S, F>(self, title: S, cb: F) -> Self
where S: Into<String>,
F: 'static + Fn(&mut Cursive)
{
self.with(|menu| menu.add_leaf(title, cb))
}
pub fn insert_subtree<S>(&mut self, i: usize, title: S, tree: MenuTree)
where S: Into<String>
{
let title = title.into();
let tree = MenuItem::Subtree(title, Rc::new(tree));
self.children.insert(i, tree);
}
pub fn add_subtree<S>(&mut self, title: S, tree: MenuTree)
where S: Into<String>
{
let i = self.children.len();
self.insert_subtree(i, title, tree);
}
pub fn subtree<S>(self, title: S, tree: MenuTree) -> Self
where S: Into<String>
{
self.with(|menu| menu.add_subtree(title, tree))
}
pub fn find_item(&mut self, title: &str) -> Option<&mut MenuItem> {
self.children
.iter_mut()
.find(|child| child.label() == title)
}
pub fn find_position(&mut self, title: &str) -> Option<usize> {
self.children
.iter()
.position(|child| child.label() == title)
}
pub fn find_subtree(&mut self, title: &str) -> Option<&mut MenuTree> {
self.find_item(title)
.and_then(|item| if let MenuItem::Subtree(_, ref mut tree) =
*item {
Some(Rc::make_mut(tree))
} else {
None
})
}
pub fn remove(&mut self, i: usize) {
self.children.remove(i);
}
pub fn len(&self) -> usize {
self.children.len()
}
pub fn is_empty(&self) -> bool {
self.children.is_empty()
}
}