spair 0.0.9

A framework for single-page application in Rust
Documentation 
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use std::{cell::RefCell, rc::Rc};
use wasm_bindgen::UnwrapThrowExt;

use super::{FnMap, FnMapC};

pub struct QrVal<T>(Rc<RefCell<ValueContent<T>>>);
pub struct QrValMap<T, U> {
    value: QrVal<T>,
    fn_map: FnMap<T, U>,
}
pub struct QrValMapWithState<C, T, U> {
    value: QrVal<T>,
    fn_map: FnMapC<C, T, U>,
}

impl<T, U> QrValMap<T, U> {
    pub fn into_parts(self) -> (QrVal<T>, FnMap<T, U>) {
        (self.value, self.fn_map)
    }
}

impl<C, T, U> QrValMapWithState<C, T, U> {
    pub fn into_parts(self) -> (QrVal<T>, FnMapC<C, T, U>) {
        (self.value, self.fn_map)
    }
}

pub struct ValueContent<T> {
    value: T,
    a_render_is_queued: bool,
    // TODO: Removed dropped renders
    renders: Vec<Box<dyn QueueRender<T>>>,
}

impl<T> ValueContent<T> {
    pub fn value(&self) -> &T {
        &self.value
    }

    pub fn add_render(&mut self, r: Box<dyn QueueRender<T>>) {
        self.renders.push(r);
    }

    fn render(&mut self) {
        for r in self.renders.iter_mut() {
            r.render(&self.value)
        }
        self.a_render_is_queued = false;
    }

    fn need_to_queue_a_render(&mut self) -> bool {
        if self.a_render_is_queued {
            return false;
        }
        self.a_render_is_queued = true;
        true
    }
}

impl<T> From<T> for QrVal<T> {
    fn from(t: T) -> Self {
        QrVal(Rc::new(RefCell::new(ValueContent {
            value: t,
            a_render_is_queued: false,
            renders: Vec::new(),
        })))
    }
}

impl<T: 'static> QrVal<T> {
    pub(crate) fn content(&self) -> &Rc<RefCell<ValueContent<T>>> {
        &self.0
    }
}

impl<T: 'static + PartialEq + Copy> QrVal<T> {
    pub fn get(&self) -> T {
        self.0
            .try_borrow()
            .expect_throw("Borrow for getting T")
            .value
    }
}

impl<T: 'static + PartialEq> QrVal<T> {
    fn clone(&self) -> Self {
        Self(self.0.clone())
    }

    fn queue_me(&self, queue_me: bool) {
        if queue_me {
            let this = self.clone();
            super::queue_render(move || this.render());
        }
    }

    pub fn set(&mut self, t: T) {
        let queue_me = match self.0.try_borrow_mut() {
            Ok(mut this) if t != this.value => {
                this.value = t;
                this.need_to_queue_a_render()
            }
            Ok(_) => false,
            Err(e) => {
                log::error!("{}", e);
                return;
            }
        };
        self.queue_me(queue_me);
    }

    pub fn set_with(&mut self, ft: impl FnOnce(&T) -> T) {
        let queue_me = match self.0.try_borrow_mut() {
            Ok(mut this) => {
                let t = ft(&this.value);
                if t == this.value {
                    false
                } else {
                    this.value = t;
                    this.need_to_queue_a_render()
                }
            }
            Err(e) => {
                log::error!("{}", e);
                return;
            }
        };
        self.queue_me(queue_me);
    }

    fn render(&self) {
        match self.0.try_borrow_mut() {
            Ok(mut this) => this.render(),
            Err(e) => log::error!("queue_render::value::Value::render: {}", e),
        }
    }

    pub fn map<U, F>(&self, fn_map: F) -> QrValMap<T, U>
    where
        F: 'static + Fn(&T) -> U,
    {
        QrValMap {
            value: self.clone(),
            fn_map: Box::new(fn_map),
        }
    }

    pub fn map_with_state<C, U, F>(&self, fn_map: F) -> QrValMapWithState<C, T, U>
    where
        F: 'static + Fn(&C, &T) -> U,
    {
        QrValMapWithState {
            value: self.clone(),
            fn_map: Box::new(fn_map),
        }
    }
}

pub trait QueueRender<T> {
    fn render(&mut self, t: &T);
    fn unmounted(&self) -> bool;
}