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use std::{fmt, rc::Rc};
use crate::engine::d2::platform::Dynamic;
use super::SignalConnection;
struct Generate<T>(fn() -> T);
impl<T> Copy for Generate<T> {}
impl<T> Clone for Generate<T> {
fn clone(&self) -> Self {
*self
}
}
#[derive(Default, Clone, Debug)]
pub struct SignalBase {
head: Box<Option<SignalConnection>>,
deferred_tasks: Option<Rc<Task>>,
}
impl SignalBase {
// pub const DISPATCHING_SENTINEL: SignalConnection = SignalConnection {
// listener: None,
// next: None,
// signal: None,
// stayInList: false,
// };
pub fn new(listener: Option<Dynamic>) -> Self {
// let instance = Self {
// head: None,
// deferred_tasks: None,
// };
// instance.head = if listener.is_some() {
// SignalConnection::new(Some(instance), listener)
// } else {
// None
// };
// instance
todo!("should deal with it");
}
/// Whether this signal has at least one listener.
#[inline]
pub fn has_listeners(&self) -> bool {
self.head.is_some()
}
pub(crate) fn connect_impl(&self, listener: Dynamic, prioritize: bool) -> SignalConnection {
todo!("should deal with it");
// let conn = SignalConnection::new(Some(self), listener);
// if self.dispatching() {
// todo!("should deal with it");
// // self.defer(Box::new(|| {
// // self.listAdd(conn, prioritize);
// // }));
// } else {
// self.listAdd(conn, prioritize);
// }
// conn
}
pub fn disconnect(&self, conn: &SignalConnection) {
if self.dispatching() {
todo!("should deal with it");
// self.defer(Box::new(|| {
// self.listRemove(conn);
// }));
} else {
self.list_remove(conn);
}
}
pub fn defer(&self, function: Box<dyn Fn()>) {
todo!("should deal with it");
// let tail = None;
// let p = self.deferred_tasks;
// while let Some(ref val) = p {
// tail = p;
// p = val.next;
// }
// let task = Task::new(function);
// if let Some(ref tail) = tail {
// tail.next = Some(task);
// } else {
// self.deferred_tasks = Some(task);
// }
}
pub fn will_emit(&self) -> Option<SignalConnection> {
// // Should never happen, since the pub emit methods will defer, but just in case..
// assert!(!self.dispatching());
// let snapshot = self.head;
// self.head = Self::DISPATCHING_SENTINEL;
// snapshot
todo!("should deal with it");
}
pub fn did_emit(&self, head: SignalConnection) {
// self.head = Some(head);
// let snapshot = self.deferred_tasks;
// self.deferred_tasks = None;
// while let Some(ref val) = snapshot {
// (val.func)();
// snapshot = val.next;
// }
todo!("should deal with it");
}
pub fn list_add(&self, conn: SignalConnection, prioritize: bool) {
todo!("should deal with it");
// if prioritize {
// // Prepend it to the beginning of the list
// conn.next = self.head;
// self.head = Some(conn);
// } else {
// // Append it to the end of the list
// let tail = None;
// let p = self.head;
// while let Some(ref val) = p {
// tail = p;
// p = val._next;
// }
// if let Some(ref tail) = tail {
// tail._next = Some(conn);
// } else {
// self.head = Some(conn);
// }
// }
}
pub fn list_remove(&self, conn: &SignalConnection) {
let prev: Option<SignalConnection> = None;
let p = &self.head;
todo!("should deal with it");
// while let Some(val) = p {
// if val == conn {
// // Splice out p
// let next = val._next;
// match prev {
// None => self.head = next,
// Some(ref prev) => prev.next = next,
// }
// return;
// }
// prev = *p;
// p = &val._next;
// }
}
#[inline]
pub fn dispatching(&self) -> bool {
todo!("should deal with it");
// self.head == Self::DISPATCHING_SENTINEL
}
}
#[derive(Default, Clone)]
struct Task {
pub func: Option<Rc<dyn Fn() + 'static>>,
pub next: Option<Box<Task>>,
}
// impl Copy for Task { }
impl Task {
pub fn new(func: Box<dyn Fn()>) -> Self {
// Self {
// func: Some(func),
// next: None,
// }
todo!("should deal with it");
}
}
impl fmt::Debug for Task {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Task")
// .field("x", &self.x)
// .field("y", &self.y)
.finish()
}
}