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use crate::view::{Selector, View, ViewWrapper};
use owning_ref::{OwningHandle, RcRef};
use std::any::Any;
use std::cell::{RefCell, RefMut};
use std::ops::DerefMut;
use std::rc::Rc;
pub struct IdView<V: View> {
view: Rc<RefCell<V>>,
id: String,
}
pub type ViewRef<V> = OwningHandle<RcRef<RefCell<V>>, RefMut<'static, V>>;
impl<V: View> IdView<V> {
pub fn new<S: Into<String>>(id: S, view: V) -> Self {
IdView {
view: Rc::new(RefCell::new(view)),
id: id.into(),
}
}
pub fn get_mut(&mut self) -> ViewRef<V> {
let cell_ref = RcRef::new(Rc::clone(&self.view));
OwningHandle::new_mut(cell_ref)
}
}
type BoxedCallback<'a> = Box<for<'b> FnMut(&'b mut dyn Any) + 'a>;
impl<T: View + 'static> ViewWrapper for IdView<T> {
type V = T;
fn with_view<F, R>(&self, f: F) -> Option<R>
where
F: FnOnce(&Self::V) -> R,
{
self.view.try_borrow().ok().map(|v| f(&*v))
}
fn with_view_mut<F, R>(&mut self, f: F) -> Option<R>
where
F: FnOnce(&mut Self::V) -> R,
{
self.view.try_borrow_mut().ok().map(|mut v| f(&mut *v))
}
fn into_inner(mut self) -> Result<Self::V, Self>
where
Self::V: Sized,
{
match Rc::try_unwrap(self.view) {
Err(rc) => {
self.view = rc;
Err(self)
}
Ok(cell) => Ok(cell.into_inner()),
}
}
fn wrap_call_on_any<'a>(
&mut self, selector: &Selector<'_>, mut callback: BoxedCallback<'a>,
) {
match selector {
&Selector::Id(id) if id == self.id => callback(self),
s => {
if let Ok(mut v) = self.view.try_borrow_mut() {
v.deref_mut().call_on_any(s, callback);
}
}
}
}
fn wrap_focus_view(&mut self, selector: &Selector<'_>) -> Result<(), ()> {
match selector {
&Selector::Id(id) if id == self.id => Ok(()),
s => self
.view
.try_borrow_mut()
.map_err(|_| ())
.and_then(|mut v| v.deref_mut().focus_view(s)),
}
}
}