mirror of
https://github.com/DioxusLabs/dioxus
synced 2024-12-24 03:23:11 +00:00
627 lines
23 KiB
Rust
627 lines
23 KiB
Rust
//! # Virtual DOM Implementation for Rust
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//!
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//! This module provides the primary mechanics to create a hook-based, concurrent VDOM for Rust.
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use crate::{
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any_props::VProps,
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arena::{ElementId, ElementRef},
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innerlude::{DirtyScope, ErrorBoundary, Mutations, Scheduler, SchedulerMsg},
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mutations::Mutation,
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nodes::RenderReturn,
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nodes::{Template, TemplateId},
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scheduler::SuspenseId,
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scopes::{ScopeId, ScopeState},
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AttributeValue, Element, Event, Scope, SuspenseContext,
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};
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use futures_util::{pin_mut, StreamExt};
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use slab::Slab;
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use std::{
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any::Any,
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borrow::BorrowMut,
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cell::Cell,
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collections::{BTreeSet, HashMap},
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future::Future,
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rc::Rc,
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};
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/// A virtual node system that progresses user events and diffs UI trees.
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///
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/// ## Guide
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///
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/// Components are defined as simple functions that take [`Scope`] and return an [`Element`].
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///
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/// ```rust, ignore
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/// #[derive(Props, PartialEq)]
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/// struct AppProps {
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/// title: String
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/// }
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///
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/// fn App(cx: Scope<AppProps>) -> Element {
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/// cx.render(rsx!(
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/// div {"hello, {cx.props.title}"}
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/// ))
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/// }
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/// ```
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///
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/// Components may be composed to make complex apps.
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///
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/// ```rust, ignore
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/// fn App(cx: Scope<AppProps>) -> Element {
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/// cx.render(rsx!(
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/// NavBar { routes: ROUTES }
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/// Title { "{cx.props.title}" }
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/// Footer {}
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/// ))
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/// }
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/// ```
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///
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/// To start an app, create a [`VirtualDom`] and call [`VirtualDom::rebuild`] to get the list of edits required to
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/// draw the UI.
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///
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/// ```rust, ignore
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/// let mut vdom = VirtualDom::new(App);
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/// let edits = vdom.rebuild();
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/// ```
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///
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/// To call listeners inside the VirtualDom, call [`VirtualDom::handle_event`] with the appropriate event data.
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///
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/// ```rust, ignore
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/// vdom.handle_event(event);
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/// ```
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///
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/// While no events are ready, call [`VirtualDom::wait_for_work`] to poll any futures inside the VirtualDom.
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///
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/// ```rust, ignore
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/// vdom.wait_for_work().await;
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/// ```
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///
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/// Once work is ready, call [`VirtualDom::render_with_deadline`] to compute the differences between the previous and
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/// current UI trees. This will return a [`Mutations`] object that contains Edits, Effects, and NodeRefs that need to be
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/// handled by the renderer.
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///
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/// ```rust, ignore
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/// let mutations = vdom.work_with_deadline(tokio::time::sleep(Duration::from_millis(100)));
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///
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/// for edit in mutations.edits {
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/// real_dom.apply(edit);
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/// }
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/// ```
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///
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/// To not wait for suspense while diffing the VirtualDom, call [`VirtualDom::render_immediate`] or pass an immediately
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/// ready future to [`VirtualDom::render_with_deadline`].
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///
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///
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/// ## Building an event loop around Dioxus:
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///
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/// Putting everything together, you can build an event loop around Dioxus by using the methods outlined above.
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/// ```rust, ignore
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/// fn app(cx: Scope) -> Element {
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/// cx.render(rsx! {
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/// div { "Hello World" }
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/// })
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/// }
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///
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/// let dom = VirtualDom::new(app);
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///
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/// real_dom.apply(dom.rebuild());
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///
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/// loop {
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/// select! {
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/// _ = dom.wait_for_work() => {}
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/// evt = real_dom.wait_for_event() => dom.handle_event(evt),
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/// }
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///
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/// real_dom.apply(dom.render_immediate());
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/// }
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/// ```
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///
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/// ## Waiting for suspense
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///
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/// Because Dioxus supports suspense, you can use it for server-side rendering, static site generation, and other usecases
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/// where waiting on portions of the UI to finish rendering is important. To wait for suspense, use the
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/// [`VirtualDom::render_with_deadline`] method:
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///
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/// ```rust, ignore
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/// let dom = VirtualDom::new(app);
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///
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/// let deadline = tokio::time::sleep(Duration::from_millis(100));
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/// let edits = dom.render_with_deadline(deadline).await;
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/// ```
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///
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/// ## Use with streaming
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///
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/// If not all rendering is done by the deadline, it might be worthwhile to stream the rest later. To do this, we
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/// suggest rendering with a deadline, and then looping between [`VirtualDom::wait_for_work`] and render_immediate until
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/// no suspended work is left.
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///
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/// ```rust, ignore
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/// let dom = VirtualDom::new(app);
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///
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/// let deadline = tokio::time::sleep(Duration::from_millis(20));
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/// let edits = dom.render_with_deadline(deadline).await;
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///
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/// real_dom.apply(edits);
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///
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/// while dom.has_suspended_work() {
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/// dom.wait_for_work().await;
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/// real_dom.apply(dom.render_immediate());
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/// }
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/// ```
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pub struct VirtualDom {
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pub(crate) templates: HashMap<TemplateId, Template<'static>>,
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pub(crate) scopes: Slab<Box<ScopeState>>,
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pub(crate) dirty_scopes: BTreeSet<DirtyScope>,
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pub(crate) scheduler: Rc<Scheduler>,
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// Every element is actually a dual reference - one to the template and the other to the dynamic node in that template
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pub(crate) elements: Slab<ElementRef>,
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// While diffing we need some sort of way of breaking off a stream of suspended mutations.
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pub(crate) scope_stack: Vec<ScopeId>,
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pub(crate) collected_leaves: Vec<SuspenseId>,
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// Whenever a suspense tree is finished, we push its boundary onto this stack.
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// When "render_with_deadline" is called, we pop the stack and return the mutations
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pub(crate) finished_fibers: Vec<ScopeId>,
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pub(crate) rx: futures_channel::mpsc::UnboundedReceiver<SchedulerMsg>,
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pub(crate) mutations: Mutations<'static>,
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}
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impl VirtualDom {
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/// Create a new VirtualDom with a component that does not have special props.
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///
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/// # Description
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///
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/// Later, the props can be updated by calling "update" with a new set of props, causing a set of re-renders.
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///
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/// This is useful when a component tree can be driven by external state (IE SSR) but it would be too expensive
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/// to toss out the entire tree.
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///
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///
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/// # Example
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/// ```rust, ignore
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/// fn Example(cx: Scope) -> Element {
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/// cx.render(rsx!( div { "hello world" } ))
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/// }
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///
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/// let dom = VirtualDom::new(Example);
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/// ```
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///
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/// Note: the VirtualDom is not progressed, you must either "run_with_deadline" or use "rebuild" to progress it.
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pub fn new(app: fn(Scope) -> Element) -> Self {
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Self::new_with_props(app, ())
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}
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/// Create a new VirtualDom with the given properties for the root component.
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///
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/// # Description
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///
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/// Later, the props can be updated by calling "update" with a new set of props, causing a set of re-renders.
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///
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/// This is useful when a component tree can be driven by external state (IE SSR) but it would be too expensive
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/// to toss out the entire tree.
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///
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///
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/// # Example
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/// ```rust, ignore
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/// #[derive(PartialEq, Props)]
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/// struct SomeProps {
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/// name: &'static str
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/// }
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///
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/// fn Example(cx: Scope<SomeProps>) -> Element {
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/// cx.render(rsx!{ div{ "hello {cx.props.name}" } })
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/// }
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///
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/// let dom = VirtualDom::new(Example);
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/// ```
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///
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/// Note: the VirtualDom is not progressed on creation. You must either "run_with_deadline" or use "rebuild" to progress it.
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///
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/// ```rust, ignore
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/// let mut dom = VirtualDom::new_with_props(Example, SomeProps { name: "jane" });
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/// let mutations = dom.rebuild();
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/// ```
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pub fn new_with_props<P: 'static>(root: fn(Scope<P>) -> Element, root_props: P) -> Self {
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let (tx, rx) = futures_channel::mpsc::unbounded();
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let mut dom = Self {
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rx,
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scheduler: Scheduler::new(tx),
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templates: Default::default(),
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scopes: Slab::default(),
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elements: Default::default(),
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scope_stack: Vec::new(),
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dirty_scopes: BTreeSet::new(),
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collected_leaves: Vec::new(),
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finished_fibers: Vec::new(),
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mutations: Mutations::default(),
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};
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let root = dom.new_scope(
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Box::new(VProps::new(root, |_, _| unreachable!(), root_props)),
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"app",
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);
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// The root component is always a suspense boundary for any async children
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// This could be unexpected, so we might rethink this behavior later
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//
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// We *could* just panic if the suspense boundary is not found
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root.provide_context(Rc::new(SuspenseContext::new(ScopeId(0))));
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// Unlike react, we provide a default error boundary that just renders the error as a string
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root.provide_context(Rc::new(ErrorBoundary::new(ScopeId(0))));
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// the root element is always given element ID 0 since it's the container for the entire tree
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dom.elements.insert(ElementRef::null());
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dom
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}
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/// Get the state for any scope given its ID
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///
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/// This is useful for inserting or removing contexts from a scope, or rendering out its root node
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pub fn get_scope(&self, id: ScopeId) -> Option<&ScopeState> {
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self.scopes.get(id.0).map(|f| f.as_ref())
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}
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/// Get the single scope at the top of the VirtualDom tree that will always be around
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///
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/// This scope has a ScopeId of 0 and is the root of the tree
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pub fn base_scope(&self) -> &ScopeState {
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self.scopes.get(0).unwrap()
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}
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/// Build the virtualdom with a global context inserted into the base scope
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///
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/// This is useful for what is essentially dependency injection when building the app
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pub fn with_root_context<T: Clone + 'static>(self, context: T) -> Self {
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self.base_scope().provide_context(context);
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self
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}
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/// Manually mark a scope as requiring a re-render
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///
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/// Whenever the VirtualDom "works", it will re-render this scope
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pub fn mark_dirty(&mut self, id: ScopeId) {
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let height = self.scopes[id.0].height;
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self.dirty_scopes.insert(DirtyScope { height, id });
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}
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/// Determine whether or not a scope is currently in a suspended state
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///
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/// This does not mean the scope is waiting on its own futures, just that the tree that the scope exists in is
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/// currently suspended.
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pub fn is_scope_suspended(&self, id: ScopeId) -> bool {
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!self.scopes[id.0]
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.consume_context::<Rc<SuspenseContext>>()
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.unwrap()
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.waiting_on
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.borrow()
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.is_empty()
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}
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/// Determine if the tree is at all suspended. Used by SSR and other outside mechanisms to determine if the tree is
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/// ready to be rendered.
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pub fn has_suspended_work(&self) -> bool {
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!self.scheduler.leaves.borrow().is_empty()
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}
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/// Call a listener inside the VirtualDom with data from outside the VirtualDom.
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///
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/// This method will identify the appropriate element. The data must match up with the listener delcared. Note that
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/// this method does not give any indication as to the success of the listener call. If the listener is not found,
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/// nothing will happen.
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///
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/// It is up to the listeners themselves to mark nodes as dirty.
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///
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/// If you have multiple events, you can call this method multiple times before calling "render_with_deadline"
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pub fn handle_event(
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&mut self,
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name: &str,
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data: Rc<dyn Any>,
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element: ElementId,
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bubbles: bool,
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) {
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/*
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------------------------
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The algorithm works by walking through the list of dynamic attributes, checking their paths, and breaking when
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we find the target path.
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With the target path, we try and move up to the parent until there is no parent.
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Due to how bubbling works, we call the listeners before walking to the parent.
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If we wanted to do capturing, then we would accumulate all the listeners and call them in reverse order.
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----------------------
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For a visual demonstration, here we present a tree on the left and whether or not a listener is collected on the
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right.
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| <-- yes (is ascendant)
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| | | <-- no (is not direct ascendant)
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| | <-- yes (is ascendant)
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| | | | | <--- target element, break early, don't check other listeners
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| | | <-- no, broke early
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| <-- no, broke early
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*/
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let mut parent_path = self.elements.get(element.0);
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let mut listeners = vec![];
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// We will clone this later. The data itself is wrapped in RC to be used in callbacks if required
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let uievent = Event {
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propogates: Rc::new(Cell::new(bubbles)),
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data,
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};
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// Loop through each dynamic attribute in this template before moving up to the template's parent.
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while let Some(el_ref) = parent_path {
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// safety: we maintain references of all vnodes in the element slab
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let template = unsafe { &*el_ref.template };
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let target_path = el_ref.path;
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for (idx, attr) in template.dynamic_attrs.iter().enumerate() {
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let this_path = template.template.attr_paths[idx];
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// listeners are required to be prefixed with "on", but they come back to the virtualdom with that missing
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// we should fix this so that we look for "onclick" instead of "click"
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if &attr.name[2..] == name && target_path.is_ascendant(&this_path) {
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listeners.push(&attr.value);
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// Break if the event doesn't bubble anyways
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if !bubbles {
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break;
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}
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// Break if this is the exact target element.
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// This means we won't call two listeners with the same name on the same element. This should be
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// documented, or be rejected from the rsx! macro outright
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if target_path == this_path {
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break;
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}
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}
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}
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// Now that we've accumulated all the parent attributes for the target element, call them in reverse order
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// We check the bubble state between each call to see if the event has been stopped from bubbling
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for listener in listeners.drain(..).rev() {
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if let AttributeValue::Listener(listener) = listener {
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if let Some(cb) = listener.borrow_mut().as_deref_mut() {
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cb(uievent.clone());
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}
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if !uievent.propogates.get() {
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return;
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}
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}
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}
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parent_path = template.parent.and_then(|id| self.elements.get(id.0));
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}
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}
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/// Wait for the scheduler to have any work.
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///
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/// This method polls the internal future queue, waiting for suspense nodes, tasks, or other work. This completes when
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/// any work is ready. If multiple scopes are marked dirty from a task or a suspense tree is finished, this method
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/// will exit.
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///
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/// This method is cancel-safe, so you're fine to discard the future in a select block.
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///
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/// This lets us poll async tasks and suspended trees during idle periods without blocking the main thread.
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///
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/// # Example
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///
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/// ```rust, ignore
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/// let dom = VirtualDom::new(App);
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/// let sender = dom.get_scheduler_channel();
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/// ```
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pub async fn wait_for_work(&mut self) {
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let mut some_msg = None;
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loop {
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match some_msg.take() {
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// If a bunch of messages are ready in a sequence, try to pop them off synchronously
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Some(msg) => match msg {
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SchedulerMsg::Immediate(id) => self.mark_dirty(id),
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SchedulerMsg::TaskNotified(task) => self.handle_task_wakeup(task),
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SchedulerMsg::SuspenseNotified(id) => self.handle_suspense_wakeup(id),
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},
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// If they're not ready, then we should wait for them to be ready
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None => {
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match self.rx.try_next() {
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Ok(Some(val)) => some_msg = Some(val),
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Ok(None) => return,
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Err(_) => {
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// If we have any dirty scopes, or finished fiber trees then we should exit
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if !self.dirty_scopes.is_empty() || !self.finished_fibers.is_empty() {
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return;
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}
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some_msg = self.rx.next().await
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}
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}
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}
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}
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}
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}
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/// Process all events in the queue until there are no more left
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pub fn process_events(&mut self) {
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while let Ok(Some(msg)) = self.rx.try_next() {
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match msg {
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SchedulerMsg::Immediate(id) => self.mark_dirty(id),
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SchedulerMsg::TaskNotified(task) => self.handle_task_wakeup(task),
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SchedulerMsg::SuspenseNotified(id) => self.handle_suspense_wakeup(id),
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}
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}
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}
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/// Performs a *full* rebuild of the virtual dom, returning every edit required to generate the actual dom from scratch.
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///
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/// The mutations item expects the RealDom's stack to be the root of the application.
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///
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/// Tasks will not be polled with this method, nor will any events be processed from the event queue. Instead, the
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/// root component will be ran once and then diffed. All updates will flow out as mutations.
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///
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/// All state stored in components will be completely wiped away.
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///
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/// Any templates previously registered will remain.
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///
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/// # Example
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/// ```rust, ignore
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/// static App: Component = |cx| cx.render(rsx!{ "hello world" });
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///
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/// let mut dom = VirtualDom::new();
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/// let edits = dom.rebuild();
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///
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/// apply_edits(edits);
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/// ```
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pub fn rebuild(&mut self) -> Mutations {
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match unsafe { self.run_scope(ScopeId(0)).extend_lifetime_ref() } {
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// Rebuilding implies we append the created elements to the root
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RenderReturn::Sync(Ok(node)) => {
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let m = self.create_scope(ScopeId(0), node);
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self.mutations.edits.push(Mutation::AppendChildren {
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id: ElementId(0),
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m,
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});
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}
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// If an error occurs, we should try to render the default error component and context where the error occured
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RenderReturn::Sync(Err(e)) => panic!("Cannot catch errors during rebuild {:?}", e),
|
|
RenderReturn::Async(_) => unreachable!("Root scope cannot be an async component"),
|
|
}
|
|
|
|
self.finalize()
|
|
}
|
|
|
|
/// Render whatever the VirtualDom has ready as fast as possible without requiring an executor to progress
|
|
/// suspended subtrees.
|
|
pub fn render_immediate(&mut self) -> Mutations {
|
|
// Build a waker that won't wake up since our deadline is already expired when it's polled
|
|
let waker = futures_util::task::noop_waker();
|
|
let mut cx = std::task::Context::from_waker(&waker);
|
|
|
|
// Now run render with deadline but dont even try to poll any async tasks
|
|
let fut = self.render_with_deadline(std::future::ready(()));
|
|
pin_mut!(fut);
|
|
|
|
// The root component is not allowed to be async
|
|
match fut.poll(&mut cx) {
|
|
std::task::Poll::Ready(mutations) => mutations,
|
|
std::task::Poll::Pending => panic!("render_immediate should never return pending"),
|
|
}
|
|
}
|
|
|
|
/// Render what you can given the timeline and then move on
|
|
///
|
|
/// It's generally a good idea to put some sort of limit on the suspense process in case a future is having issues.
|
|
///
|
|
/// If no suspense trees are present
|
|
pub async fn render_with_deadline(&mut self, deadline: impl Future<Output = ()>) -> Mutations {
|
|
pin_mut!(deadline);
|
|
|
|
loop {
|
|
// first, unload any complete suspense trees
|
|
for finished_fiber in self.finished_fibers.drain(..) {
|
|
let scope = &mut self.scopes[finished_fiber.0];
|
|
let context = scope.has_context::<Rc<SuspenseContext>>().unwrap();
|
|
|
|
self.mutations
|
|
.templates
|
|
.append(&mut context.mutations.borrow_mut().templates);
|
|
|
|
self.mutations
|
|
.edits
|
|
.append(&mut context.mutations.borrow_mut().edits);
|
|
|
|
// TODO: count how many nodes are on the stack?
|
|
self.mutations.push(Mutation::ReplaceWith {
|
|
id: context.placeholder.get().unwrap(),
|
|
m: 1,
|
|
})
|
|
}
|
|
|
|
// Next, diff any dirty scopes
|
|
// We choose not to poll the deadline since we complete pretty quickly anyways
|
|
if let Some(dirty) = self.dirty_scopes.iter().next().cloned() {
|
|
self.dirty_scopes.remove(&dirty);
|
|
|
|
// if the scope is currently suspended, then we should skip it, ignoring any tasks calling for an update
|
|
if self.is_scope_suspended(dirty.id) {
|
|
continue;
|
|
}
|
|
|
|
// Save the current mutations length so we can split them into boundary
|
|
let mutations_to_this_point = self.mutations.edits.len();
|
|
|
|
// Run the scope and get the mutations
|
|
self.run_scope(dirty.id);
|
|
self.diff_scope(dirty.id);
|
|
|
|
// If suspended leaves are present, then we should find the boundary for this scope and attach things
|
|
// No placeholder necessary since this is a diff
|
|
if !self.collected_leaves.is_empty() {
|
|
let mut boundary = self.scopes[dirty.id.0]
|
|
.consume_context::<Rc<SuspenseContext>>()
|
|
.unwrap();
|
|
|
|
let boundary_mut = boundary.borrow_mut();
|
|
|
|
// Attach mutations
|
|
boundary_mut
|
|
.mutations
|
|
.borrow_mut()
|
|
.edits
|
|
.extend(self.mutations.edits.split_off(mutations_to_this_point));
|
|
|
|
// Attach suspended leaves
|
|
boundary
|
|
.waiting_on
|
|
.borrow_mut()
|
|
.extend(self.collected_leaves.drain(..));
|
|
}
|
|
}
|
|
|
|
// If there's more work, then just continue, plenty of work to do
|
|
if !self.dirty_scopes.is_empty() {
|
|
continue;
|
|
}
|
|
|
|
// If there's no pending suspense, then we have no reason to wait for anything
|
|
if self.scheduler.leaves.borrow().is_empty() {
|
|
return self.finalize();
|
|
}
|
|
|
|
// Poll the suspense leaves in the meantime
|
|
let mut work = self.wait_for_work();
|
|
|
|
// safety: this is okay since we don't touch the original future
|
|
let pinned = unsafe { std::pin::Pin::new_unchecked(&mut work) };
|
|
|
|
// If the deadline is exceded (left) then we should return the mutations we have
|
|
use futures_util::future::{select, Either};
|
|
if let Either::Left((_, _)) = select(&mut deadline, pinned).await {
|
|
// release the borrowed
|
|
drop(work);
|
|
return self.finalize();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Swap the current mutations with a new
|
|
fn finalize(&mut self) -> Mutations {
|
|
// todo: make this a routine
|
|
let mut out = Mutations::default();
|
|
std::mem::swap(&mut self.mutations, &mut out);
|
|
out
|
|
}
|
|
}
|
|
|
|
impl Drop for VirtualDom {
|
|
fn drop(&mut self) {
|
|
// Simply drop this scope which drops all of its children
|
|
self.drop_scope(ScopeId(0));
|
|
}
|
|
}
|