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use std::collections::*;
use std::cell::*;
use std::marker::*;
use std::any::*;
use std::rc::*;
use serde::{Serialize, Deserialize, de::DeserializeOwned};
use crate::backend::browser;
use crate::view_sys::dsl::View;
use crate::program_sys::instances::TickEnv;
use crate::program_sys::shell::*;
use crate::reactive_sys::*;
use crate::program_sys::spec::Spec;
pub use crate::program_sys::shell::{Shell};
pub use crate::program_sys::effect::nav::UrlString;
pub struct Subscriptions<Msg> {
signal_sub: Vec<Box<Fn()->Option<Msg>>>,
mail_subs: Vec<Box<Fn(Rc<Any>)->Option<Msg>>>,
}
impl<Msg> Default for Subscriptions<Msg> {
fn default() -> Self {
Subscriptions {
signal_sub: Vec::new(),
mail_subs: Vec::new(),
}
}
}
impl<Msg: 'static> Subscriptions<Msg> {
pub fn add_signal_sub<S: Reactive<T>, T: 'static + PartialEq + Clone>(
&mut self,
signal: &S,
on_change: impl Fn(T) -> Msg + 'static,
) {
let f: Box<Fn() -> Option<Msg> + 'static> = Box::new({
let signal = signal.signal_output();
let recorded_value: Rc<RefCell<Rc<T>>> = Rc::new(RefCell::new(signal.get()));
move || -> Option<Msg> {
let mut result: Option<Msg> = None;
let signal = signal.clone();
let current_value: Rc<T> = signal.get();
let unchanged = {
let x: &T = current_value.as_ref();
let y: &T = &recorded_value.borrow();
x == y
};
if !unchanged {
result = Some(on_change(signal.get_copy()));
recorded_value.replace(current_value);
}
result
}
});
self.signal_sub.push(Box::new(f));
}
pub fn add_msg_sub<T: 'static + Clone>(&mut self, on_global_message: impl Fn(T) -> Msg + 'static) {
let f: Box<Fn(Rc<Any>)->Option<Msg>> = Box::new({
move |something: Rc<Any>| -> Option<Msg> {
let mut result: Option<Msg> = None;
if let Some(value) = something.downcast_ref::<T>() {
result = Some(on_global_message(value.clone()));
}
result
}
});
self.mail_subs.push(f);
}
}
impl<Msg> Subscriptions<Msg> {
pub(crate) fn tick<S: Spec + 'static>(&self, instance_name: &str, tick_env: &mut TickEnv<Msg>){
let self_tid = TypeId::of::<S>();
for f in self.signal_sub.iter() {
if let Some(msg) = f() {
tick_env.local_messages.push(msg);
}
}
for message in tick_env.system_messages {
let sender_is_receiver = message.sender_is_receiver::<S>(instance_name);
let opt_valid_private_address = {
let mut result = true;
if let Some(to_tid) = message.is_private() {
result = to_tid == self_tid;
}
result
};
if (!sender_is_receiver) && opt_valid_private_address {
for mail_sub in self.mail_subs.iter() {
if let Some(msg) = mail_sub(message.value()) {
tick_env.local_messages.push(msg);
}
}
}
}
}
}
#[macro_export]
#[doc(hidden)]
macro_rules! i_subs_entry {
($subs:expr; sig $name:ident ($value:expr => $new_value:ident) -> $msg:ty {$($body:tt)*}) => {{
$subs.add_signal_sub(&$value, move |$new_value| -> $msg {{
$($body)*
}});
}};
($subs:expr; msg $name:ident ($value:ident : $type:ty) -> $msg:ty {$body:expr}) => {{
$subs.add_msg_sub(move |$value : $type| {
$body
});
}};
}
#[macro_export]
macro_rules! subs {
() => {{
use $crate::program_sys::spec::*;
let subs = Subscriptions::default();
subs
}};
($($kind:ident $fn_name:ident $args:tt -> $msg:ty {$($body:tt)*})*) => {{
use std::any::{Any, TypeId};
use std::rc::Rc;
use $crate::program_sys::spec::*;
let mut subs = Subscriptions::default();
$({
i_subs_entry!(subs; $kind $fn_name $args -> $msg {{$($body)*}});
})*
subs
}};
}