743 lines
25 KiB
Rust
743 lines
25 KiB
Rust
//! # VirtualDom Implementation for Rust
|
||
//!
|
||
//! This module provides the primary mechanics to create a hook-based, concurrent VDOM for Rust.
|
||
|
||
use crate::innerlude::*;
|
||
use futures_channel::mpsc::{UnboundedReceiver, UnboundedSender};
|
||
use futures_util::{future::poll_fn, StreamExt};
|
||
use fxhash::FxHashSet;
|
||
use indexmap::IndexSet;
|
||
use std::{collections::VecDeque, iter::FromIterator, task::Poll};
|
||
|
||
/// A virtual node s ystem that progresses user events and diffs UI trees.
|
||
///
|
||
///
|
||
/// ## Guide
|
||
///
|
||
/// Components are defined as simple functions that take [`Scope`] and return an [`Element`].
|
||
///
|
||
/// ```rust, ignore
|
||
/// #[derive(Props, PartialEq)]
|
||
/// struct AppProps {
|
||
/// title: String
|
||
/// }
|
||
///
|
||
/// fn App(cx: Scope<AppProps>) -> Element {
|
||
/// cx.render(rsx!(
|
||
/// div {"hello, {cx.props.title}"}
|
||
/// ))
|
||
/// }
|
||
/// ```
|
||
///
|
||
/// Components may be composed to make complex apps.
|
||
///
|
||
/// ```rust, ignore
|
||
/// fn App(cx: Scope<AppProps>) -> Element {
|
||
/// cx.render(rsx!(
|
||
/// NavBar { routes: ROUTES }
|
||
/// Title { "{cx.props.title}" }
|
||
/// Footer {}
|
||
/// ))
|
||
/// }
|
||
/// ```
|
||
///
|
||
/// To start an app, create a [`VirtualDom`] and call [`VirtualDom::rebuild`] to get the list of edits required to
|
||
/// draw the UI.
|
||
///
|
||
/// ```rust, ignore
|
||
/// let mut vdom = VirtualDom::new(App);
|
||
/// let edits = vdom.rebuild();
|
||
/// ```
|
||
///
|
||
/// To inject UserEvents into the VirtualDom, call [`VirtualDom::get_scheduler_channel`] to get access to the scheduler.
|
||
///
|
||
/// ```rust, ignore
|
||
/// let channel = vdom.get_scheduler_channel();
|
||
/// channel.send_unbounded(SchedulerMsg::UserEvent(UserEvent {
|
||
/// // ...
|
||
/// }))
|
||
/// ```
|
||
///
|
||
/// While waiting for UserEvents to occur, call [`VirtualDom::wait_for_work`] to poll any futures inside the VirtualDom.
|
||
///
|
||
/// ```rust, ignore
|
||
/// vdom.wait_for_work().await;
|
||
/// ```
|
||
///
|
||
/// Once work is ready, call [`VirtualDom::work_with_deadline`] to compute the differences between the previous and
|
||
/// current UI trees. This will return a [`Mutations`] object that contains Edits, Effects, and NodeRefs that need to be
|
||
/// handled by the renderer.
|
||
///
|
||
/// ```rust, ignore
|
||
/// let mutations = vdom.work_with_deadline(|| false);
|
||
/// for edit in mutations {
|
||
/// apply(edit);
|
||
/// }
|
||
/// ```
|
||
///
|
||
/// ## Building an event loop around Dioxus:
|
||
///
|
||
/// Putting everything together, you can build an event loop around Dioxus by using the methods outlined above.
|
||
///
|
||
/// ```rust, ignore
|
||
/// fn App(cx: Scope) -> Element {
|
||
/// cx.render(rsx!{
|
||
/// div { "Hello World" }
|
||
/// })
|
||
/// }
|
||
///
|
||
/// async fn main() {
|
||
/// let mut dom = VirtualDom::new(App);
|
||
///
|
||
/// let mut inital_edits = dom.rebuild();
|
||
/// apply_edits(inital_edits);
|
||
///
|
||
/// loop {
|
||
/// dom.wait_for_work().await;
|
||
/// let frame_timeout = TimeoutFuture::new(Duration::from_millis(16));
|
||
/// let deadline = || (&mut frame_timeout).now_or_never();
|
||
/// let edits = dom.run_with_deadline(deadline).await;
|
||
/// apply_edits(edits);
|
||
/// }
|
||
/// }
|
||
/// ```
|
||
pub struct VirtualDom {
|
||
scopes: ScopeArena,
|
||
|
||
pending_messages: VecDeque<SchedulerMsg>,
|
||
dirty_scopes: IndexSet<ScopeId>,
|
||
|
||
channel: (
|
||
UnboundedSender<SchedulerMsg>,
|
||
UnboundedReceiver<SchedulerMsg>,
|
||
),
|
||
}
|
||
|
||
#[derive(Debug)]
|
||
pub enum SchedulerMsg {
|
||
// events from the host
|
||
Event(UserEvent),
|
||
|
||
// setstate
|
||
Immediate(ScopeId),
|
||
|
||
// an async task pushed from an event handler (or just spawned)
|
||
NewTask(ScopeId),
|
||
}
|
||
|
||
// Methods to create the VirtualDom
|
||
impl VirtualDom {
|
||
/// Create a new VirtualDom with a component that does not have special props.
|
||
///
|
||
/// # Description
|
||
///
|
||
/// Later, the props can be updated by calling "update" with a new set of props, causing a set of re-renders.
|
||
///
|
||
/// This is useful when a component tree can be driven by external state (IE SSR) but it would be too expensive
|
||
/// to toss out the entire tree.
|
||
///
|
||
///
|
||
/// # Example
|
||
/// ```rust, ignore
|
||
/// fn Example(cx: Scope) -> Element {
|
||
/// cx.render(rsx!( div { "hello world" } ))
|
||
/// }
|
||
///
|
||
/// let dom = VirtualDom::new(Example);
|
||
/// ```
|
||
///
|
||
/// Note: the VirtualDom is not progressed, you must either "run_with_deadline" or use "rebuild" to progress it.
|
||
pub fn new(root: Component) -> Self {
|
||
Self::new_with_props(root, ())
|
||
}
|
||
|
||
/// Create a new VirtualDom with the given properties for the root component.
|
||
///
|
||
/// # Description
|
||
///
|
||
/// Later, the props can be updated by calling "update" with a new set of props, causing a set of re-renders.
|
||
///
|
||
/// This is useful when a component tree can be driven by external state (IE SSR) but it would be too expensive
|
||
/// to toss out the entire tree.
|
||
///
|
||
///
|
||
/// # Example
|
||
/// ```rust, ignore
|
||
/// #[derive(PartialEq, Props)]
|
||
/// struct SomeProps {
|
||
/// name: &'static str
|
||
/// }
|
||
///
|
||
/// fn Example(cx: Scope<SomeProps>) -> Element {
|
||
/// cx.render(rsx!{ div{ "hello {cx.props.name}" } })
|
||
/// }
|
||
///
|
||
/// let dom = VirtualDom::new(Example);
|
||
/// ```
|
||
///
|
||
/// Note: the VirtualDom is not progressed on creation. You must either "run_with_deadline" or use "rebuild" to progress it.
|
||
///
|
||
/// ```rust, ignore
|
||
/// let mut dom = VirtualDom::new_with_props(Example, SomeProps { name: "jane" });
|
||
/// let mutations = dom.rebuild();
|
||
/// ```
|
||
pub fn new_with_props<P>(root: Component<P>, root_props: P) -> Self
|
||
where
|
||
P: 'static,
|
||
{
|
||
Self::new_with_props_and_scheduler(
|
||
root,
|
||
root_props,
|
||
futures_channel::mpsc::unbounded::<SchedulerMsg>(),
|
||
)
|
||
}
|
||
|
||
/// Launch the VirtualDom, but provide your own channel for receiving and sending messages into the scheduler
|
||
///
|
||
/// This is useful when the VirtualDom must be driven from outside a thread and it doesn't make sense to wait for the
|
||
/// VirtualDom to be created just to retrieve its channel receiver.
|
||
///
|
||
/// ```rust, ignore
|
||
/// let channel = futures_channel::mpsc::unbounded();
|
||
/// let dom = VirtualDom::new_with_scheduler(Example, (), channel);
|
||
/// ```
|
||
pub fn new_with_props_and_scheduler<P: 'static>(
|
||
root: Component<P>,
|
||
root_props: P,
|
||
channel: (
|
||
UnboundedSender<SchedulerMsg>,
|
||
UnboundedReceiver<SchedulerMsg>,
|
||
),
|
||
) -> Self {
|
||
let scopes = ScopeArena::new(channel.0.clone());
|
||
|
||
scopes.new_with_key(
|
||
root as *const _,
|
||
Box::new(VComponentProps {
|
||
props: root_props,
|
||
memo: |_a, _b| unreachable!("memo on root will neve be run"),
|
||
render_fn: root,
|
||
}),
|
||
None,
|
||
ElementId(0),
|
||
0,
|
||
);
|
||
|
||
Self {
|
||
scopes,
|
||
channel,
|
||
dirty_scopes: IndexSet::from_iter([ScopeId(0)]),
|
||
pending_messages: VecDeque::new(),
|
||
}
|
||
}
|
||
|
||
/// Get the [`Scope`] for the root component.
|
||
///
|
||
/// This is useful for traversing the tree from the root for heuristics or alternsative renderers that use Dioxus
|
||
/// directly.
|
||
///
|
||
/// This method is equivalent to calling `get_scope(ScopeId(0))`
|
||
///
|
||
/// # Example
|
||
///
|
||
/// ```rust, ignore
|
||
/// let mut dom = VirtualDom::new(example);
|
||
/// dom.rebuild();
|
||
///
|
||
///
|
||
/// ```
|
||
pub fn base_scope(&self) -> &ScopeState {
|
||
self.get_scope(ScopeId(0)).unwrap()
|
||
}
|
||
|
||
/// Get the [`ScopeState`] for a component given its [`ScopeId`]
|
||
///
|
||
/// # Example
|
||
///
|
||
///
|
||
///
|
||
pub fn get_scope(&self, id: ScopeId) -> Option<&ScopeState> {
|
||
self.scopes.get_scope(id)
|
||
}
|
||
|
||
/// Get an [`UnboundedSender`] handle to the channel used by the scheduler.
|
||
///
|
||
/// # Example
|
||
///
|
||
/// ```rust, ignore
|
||
/// let dom = VirtualDom::new(App);
|
||
/// let sender = dom.get_scheduler_channel();
|
||
/// ```
|
||
pub fn get_scheduler_channel(&self) -> UnboundedSender<SchedulerMsg> {
|
||
self.channel.0.clone()
|
||
}
|
||
|
||
/// Try to get an element from its ElementId
|
||
pub fn get_element(&self, id: ElementId) -> Option<&VNode> {
|
||
self.scopes.get_element(id)
|
||
}
|
||
|
||
/// Add a new message to the scheduler queue directly.
|
||
///
|
||
///
|
||
/// This method makes it possible to send messages to the scheduler from outside the VirtualDom without having to
|
||
/// call `get_schedule_channel` and then `send`.
|
||
///
|
||
/// # Example
|
||
/// ```rust, ignore
|
||
/// let dom = VirtualDom::new(App);
|
||
/// dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
|
||
/// ```
|
||
pub fn handle_message(&mut self, msg: SchedulerMsg) {
|
||
if self.channel.0.unbounded_send(msg).is_ok() {
|
||
self.process_all_messages();
|
||
}
|
||
}
|
||
|
||
/// Check if the [`VirtualDom`] has any pending updates or work to be done.
|
||
///
|
||
/// # Example
|
||
///
|
||
/// ```rust, ignore
|
||
/// let dom = VirtualDom::new(App);
|
||
///
|
||
/// // the dom is "dirty" when it is started and must be rebuilt to get the first render
|
||
/// assert!(dom.has_any_work());
|
||
/// ```
|
||
pub fn has_work(&self) -> bool {
|
||
!(self.dirty_scopes.is_empty() && self.pending_messages.is_empty())
|
||
}
|
||
|
||
/// Wait for the scheduler to have any work.
|
||
///
|
||
/// This method polls the internal future queue *and* the scheduler channel.
|
||
/// To add work to the VirtualDom, insert a message via the scheduler channel.
|
||
///
|
||
/// This lets us poll async tasks during idle periods without blocking the main thread.
|
||
///
|
||
/// # Example
|
||
///
|
||
/// ```rust, ignore
|
||
/// let dom = VirtualDom::new(App);
|
||
/// let sender = dom.get_scheduler_channel();
|
||
/// ```
|
||
pub async fn wait_for_work(&mut self) {
|
||
loop {
|
||
if !self.dirty_scopes.is_empty() && self.pending_messages.is_empty() {
|
||
break;
|
||
}
|
||
|
||
if self.pending_messages.is_empty() {
|
||
if self.scopes.tasks.has_tasks() {
|
||
use futures_util::future::{select, Either};
|
||
|
||
let scopes = &mut self.scopes;
|
||
let task_poll = poll_fn(|cx| {
|
||
//
|
||
let mut any_pending = false;
|
||
|
||
let mut tasks = scopes.tasks.tasks.borrow_mut();
|
||
let mut to_remove = vec![];
|
||
|
||
// this would be better served by retain
|
||
for (id, task) in tasks.iter_mut() {
|
||
if task.as_mut().poll(cx).is_ready() {
|
||
to_remove.push(*id);
|
||
} else {
|
||
any_pending = true;
|
||
}
|
||
}
|
||
|
||
for id in to_remove {
|
||
tasks.remove(&id);
|
||
}
|
||
|
||
// Resolve the future if any singular task is ready
|
||
match any_pending {
|
||
true => Poll::Pending,
|
||
false => Poll::Ready(()),
|
||
}
|
||
});
|
||
|
||
match select(task_poll, self.channel.1.next()).await {
|
||
Either::Left((_, _)) => {}
|
||
Either::Right((msg, _)) => self.pending_messages.push_front(msg.unwrap()),
|
||
}
|
||
} else {
|
||
self.pending_messages
|
||
.push_front(self.channel.1.next().await.unwrap());
|
||
}
|
||
}
|
||
|
||
// Move all the messages into the queue
|
||
self.process_all_messages();
|
||
}
|
||
}
|
||
|
||
/// Manually kick the VirtualDom to process any
|
||
pub fn process_all_messages(&mut self) {
|
||
// clear out the scheduler queue
|
||
while let Ok(Some(msg)) = self.channel.1.try_next() {
|
||
self.pending_messages.push_front(msg);
|
||
}
|
||
|
||
// process all the messages pulled from the queue
|
||
while let Some(msg) = self.pending_messages.pop_back() {
|
||
self.process_message(msg);
|
||
}
|
||
}
|
||
|
||
pub fn process_message(&mut self, msg: SchedulerMsg) {
|
||
match msg {
|
||
SchedulerMsg::NewTask(_id) => {
|
||
// uh, not sure? I think end up re-polling it anyways
|
||
}
|
||
SchedulerMsg::Event(event) => {
|
||
if let Some(element) = event.element {
|
||
self.scopes.call_listener_with_bubbling(event, element);
|
||
}
|
||
}
|
||
SchedulerMsg::Immediate(s) => {
|
||
self.dirty_scopes.insert(s);
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Run the virtualdom with a deadline.
|
||
///
|
||
/// This method will perform any outstanding diffing work and try to return as many mutations as possible before the
|
||
/// deadline is reached. This method accepts a closure that returns `true` if the deadline has been reached. To wrap
|
||
/// your future into a deadline, consider the `now_or_never` method from `future_utils`.
|
||
///
|
||
/// ```rust, ignore
|
||
/// let mut vdom = VirtualDom::new(App);
|
||
///
|
||
/// let timeout = TimeoutFuture::from_ms(16);
|
||
/// let deadline = || (&mut timeout).now_or_never();
|
||
///
|
||
/// let mutations = vdom.work_with_deadline(deadline);
|
||
/// ```
|
||
///
|
||
/// This method is useful when needing to schedule the virtualdom around other tasks on the main thread to prevent
|
||
/// "jank". It will try to finish whatever work it has by the deadline to free up time for other work.
|
||
///
|
||
/// If the work is not finished by the deadline, Dioxus will store it for later and return when work_with_deadline
|
||
/// is called again. This means you can ensure some level of free time on the VirtualDom's thread during the work phase.
|
||
///
|
||
/// For use in the web, it is expected that this method will be called to be executed during "idle times" and the
|
||
/// mutations to be applied during the "paint times" IE "animation frames". With this strategy, it is possible to craft
|
||
/// entirely jank-free applications that perform a ton of work.
|
||
///
|
||
/// In general use, Dioxus is plenty fast enough to not need to worry about this.
|
||
///
|
||
/// # Example
|
||
///
|
||
/// ```rust, ignore
|
||
/// fn App(cx: Scope) -> Element {
|
||
/// cx.render(rsx!( div {"hello"} ))
|
||
/// }
|
||
///
|
||
/// let mut dom = VirtualDom::new(App);
|
||
///
|
||
/// loop {
|
||
/// let mut timeout = TimeoutFuture::from_ms(16);
|
||
/// let deadline = move || (&mut timeout).now_or_never();
|
||
///
|
||
/// let mutations = dom.run_with_deadline(deadline).await;
|
||
///
|
||
/// apply_mutations(mutations);
|
||
/// }
|
||
/// ```
|
||
pub fn work_with_deadline(&mut self, mut deadline: impl FnMut() -> bool) -> Vec<Mutations> {
|
||
let mut committed_mutations = vec![];
|
||
|
||
while !self.dirty_scopes.is_empty() {
|
||
let scopes = &self.scopes;
|
||
let mut diff_state = DiffState::new(scopes);
|
||
|
||
let mut ran_scopes = FxHashSet::default();
|
||
|
||
// Sort the scopes by height. Theoretically, we'll de-duplicate scopes by height
|
||
self.dirty_scopes
|
||
.retain(|id| scopes.get_scope(*id).is_some());
|
||
|
||
self.dirty_scopes.sort_by(|a, b| {
|
||
let h1 = scopes.get_scope(*a).unwrap().height;
|
||
let h2 = scopes.get_scope(*b).unwrap().height;
|
||
h1.cmp(&h2).reverse()
|
||
});
|
||
|
||
if let Some(scopeid) = self.dirty_scopes.pop() {
|
||
if !ran_scopes.contains(&scopeid) {
|
||
ran_scopes.insert(scopeid);
|
||
|
||
self.scopes.run_scope(scopeid);
|
||
|
||
let (old, new) = (self.scopes.wip_head(scopeid), self.scopes.fin_head(scopeid));
|
||
diff_state.stack.push(DiffInstruction::Diff { new, old });
|
||
diff_state.stack.scope_stack.push(scopeid);
|
||
|
||
let scope = scopes.get_scope(scopeid).unwrap();
|
||
diff_state.stack.element_stack.push(scope.container);
|
||
}
|
||
}
|
||
|
||
if diff_state.work(&mut deadline) {
|
||
let DiffState { mutations, .. } = diff_state;
|
||
|
||
for scope in &mutations.dirty_scopes {
|
||
self.dirty_scopes.remove(scope);
|
||
}
|
||
|
||
committed_mutations.push(mutations);
|
||
} else {
|
||
// leave the work in an incomplete state
|
||
//
|
||
// todo: we should store the edits and re-apply them later
|
||
// for now, we just dump the work completely (threadsafe)
|
||
return committed_mutations;
|
||
}
|
||
}
|
||
|
||
committed_mutations
|
||
}
|
||
|
||
/// Performs a *full* rebuild of the virtual dom, returning every edit required to generate the actual dom from scratch.
|
||
///
|
||
/// The diff machine expects the RealDom's stack to be the root of the application.
|
||
///
|
||
/// Tasks will not be polled with this method, nor will any events be processed from the event queue. Instead, the
|
||
/// root component will be ran once and then diffed. All updates will flow out as mutations.
|
||
///
|
||
/// All state stored in components will be completely wiped away.
|
||
///
|
||
/// # Example
|
||
/// ```rust, ignore
|
||
/// static App: Component = |cx| cx.render(rsx!{ "hello world" });
|
||
/// let mut dom = VirtualDom::new();
|
||
/// let edits = dom.rebuild();
|
||
///
|
||
/// apply_edits(edits);
|
||
/// ```
|
||
pub fn rebuild(&mut self) -> Mutations {
|
||
let scope_id = ScopeId(0);
|
||
let mut diff_state = DiffState::new(&self.scopes);
|
||
|
||
self.scopes.run_scope(scope_id);
|
||
diff_state
|
||
.stack
|
||
.create_node(self.scopes.fin_head(scope_id), MountType::Append);
|
||
|
||
diff_state.stack.element_stack.push(ElementId(0));
|
||
diff_state.stack.scope_stack.push(scope_id);
|
||
diff_state.work(|| false);
|
||
diff_state.mutations
|
||
}
|
||
|
||
/// Compute a manual diff of the VirtualDom between states.
|
||
///
|
||
/// This can be useful when state inside the DOM is remotely changed from the outside, but not propagated as an event.
|
||
///
|
||
/// In this case, every component will be diffed, even if their props are memoized. This method is intended to be used
|
||
/// to force an update of the DOM when the state of the app is changed outside of the app.
|
||
///
|
||
/// To force a reflow of the entire VirtualDom, use `ScopeId(0)` as the scope_id.
|
||
///
|
||
/// # Example
|
||
/// ```rust, ignore
|
||
/// #[derive(PartialEq, Props)]
|
||
/// struct AppProps {
|
||
/// value: Shared<&'static str>,
|
||
/// }
|
||
///
|
||
/// static App: Component<AppProps> = |cx| {
|
||
/// let val = cx.value.borrow();
|
||
/// cx.render(rsx! { div { "{val}" } })
|
||
/// };
|
||
///
|
||
/// let value = Rc::new(RefCell::new("Hello"));
|
||
/// let mut dom = VirtualDom::new_with_props(App, AppProps { value: value.clone(), });
|
||
///
|
||
/// let _ = dom.rebuild();
|
||
///
|
||
/// *value.borrow_mut() = "goodbye";
|
||
///
|
||
/// let edits = dom.diff();
|
||
/// ```
|
||
pub fn hard_diff(&mut self, scope_id: ScopeId) -> Mutations {
|
||
let mut diff_machine = DiffState::new(&self.scopes);
|
||
self.scopes.run_scope(scope_id);
|
||
|
||
let (old, new) = (
|
||
diff_machine.scopes.wip_head(scope_id),
|
||
diff_machine.scopes.fin_head(scope_id),
|
||
);
|
||
|
||
diff_machine.force_diff = true;
|
||
diff_machine.stack.push(DiffInstruction::Diff { old, new });
|
||
diff_machine.stack.scope_stack.push(scope_id);
|
||
|
||
let scope = diff_machine.scopes.get_scope(scope_id).unwrap();
|
||
diff_machine.stack.element_stack.push(scope.container);
|
||
diff_machine.work(|| false);
|
||
|
||
diff_machine.mutations
|
||
}
|
||
|
||
/// Renders an `rsx` call into the Base Scope's allocator.
|
||
///
|
||
/// Useful when needing to render nodes from outside the VirtualDom, such as in a test.
|
||
///
|
||
/// ```rust, ignore
|
||
/// fn Base(cx: Scope) -> Element {
|
||
/// rsx!(cx, div {})
|
||
/// }
|
||
///
|
||
/// let dom = VirtualDom::new(Base);
|
||
/// let nodes = dom.render_nodes(rsx!("div"));
|
||
/// ```
|
||
pub fn render_vnodes<'a>(&'a self, lazy_nodes: LazyNodes<'a, '_>) -> &'a VNode<'a> {
|
||
let scope = self.scopes.get_scope(ScopeId(0)).unwrap();
|
||
let frame = scope.wip_frame();
|
||
let factory = NodeFactory { bump: &frame.bump };
|
||
let node = lazy_nodes.call(factory);
|
||
frame.bump.alloc(node)
|
||
}
|
||
|
||
/// Renders an `rsx` call into the Base Scope's allocator.
|
||
///
|
||
/// Useful when needing to render nodes from outside the VirtualDom, such as in a test.
|
||
///
|
||
/// ```rust, ignore
|
||
/// fn Base(cx: Scope) -> Element {
|
||
/// rsx!(cx, div {})
|
||
/// }
|
||
///
|
||
/// let dom = VirtualDom::new(Base);
|
||
/// let nodes = dom.render_nodes(rsx!("div"));
|
||
/// ```
|
||
pub fn diff_vnodes<'a>(&'a self, old: &'a VNode<'a>, new: &'a VNode<'a>) -> Mutations<'a> {
|
||
let mut machine = DiffState::new(&self.scopes);
|
||
machine.stack.push(DiffInstruction::Diff { new, old });
|
||
machine.stack.element_stack.push(ElementId(0));
|
||
machine.stack.scope_stack.push(ScopeId(0));
|
||
machine.work(|| false);
|
||
machine.mutations
|
||
}
|
||
|
||
/// Renders an `rsx` call into the Base Scope's allocator.
|
||
///
|
||
/// Useful when needing to render nodes from outside the VirtualDom, such as in a test.
|
||
///
|
||
///
|
||
/// ```rust, ignore
|
||
/// fn Base(cx: Scope) -> Element {
|
||
/// rsx!(cx, div {})
|
||
/// }
|
||
///
|
||
/// let dom = VirtualDom::new(Base);
|
||
/// let nodes = dom.render_nodes(rsx!("div"));
|
||
/// ```
|
||
pub fn create_vnodes<'a>(&'a self, nodes: LazyNodes<'a, '_>) -> Mutations<'a> {
|
||
let mut machine = DiffState::new(&self.scopes);
|
||
machine.stack.element_stack.push(ElementId(0));
|
||
machine
|
||
.stack
|
||
.create_node(self.render_vnodes(nodes), MountType::Append);
|
||
machine.work(|| false);
|
||
machine.mutations
|
||
}
|
||
|
||
/// Renders an `rsx` call into the Base Scopes's arena.
|
||
///
|
||
/// Useful when needing to diff two rsx! calls from outside the VirtualDom, such as in a test.
|
||
///
|
||
///
|
||
/// ```rust, ignore
|
||
/// fn Base(cx: Scope) -> Element {
|
||
/// rsx!(cx, div {})
|
||
/// }
|
||
///
|
||
/// let dom = VirtualDom::new(Base);
|
||
/// let nodes = dom.render_nodes(rsx!("div"));
|
||
/// ```
|
||
pub fn diff_lazynodes<'a>(
|
||
&'a self,
|
||
left: LazyNodes<'a, '_>,
|
||
right: LazyNodes<'a, '_>,
|
||
) -> (Mutations<'a>, Mutations<'a>) {
|
||
let (old, new) = (self.render_vnodes(left), self.render_vnodes(right));
|
||
|
||
let mut create = DiffState::new(&self.scopes);
|
||
create.stack.scope_stack.push(ScopeId(0));
|
||
create.stack.element_stack.push(ElementId(0));
|
||
create.stack.create_node(old, MountType::Append);
|
||
create.work(|| false);
|
||
|
||
let mut edit = DiffState::new(&self.scopes);
|
||
edit.stack.scope_stack.push(ScopeId(0));
|
||
edit.stack.element_stack.push(ElementId(0));
|
||
edit.stack.push(DiffInstruction::Diff { old, new });
|
||
edit.work(|| false);
|
||
|
||
(create.mutations, edit.mutations)
|
||
}
|
||
}
|
||
|
||
/*
|
||
Scopes and ScopeArenas are never dropped internally.
|
||
An app will always occupy as much memory as its biggest form.
|
||
|
||
This means we need to handle all specifics of drop *here*. It's easier
|
||
to reason about centralizing all the drop logic in one spot rather than scattered in each module.
|
||
|
||
Broadly speaking, we want to use the remove_nodes method to clean up *everything*
|
||
This will drop listeners, borrowed props, and hooks for all components.
|
||
We need to do this in the correct order - nodes at the very bottom must be dropped first to release
|
||
the borrow chain.
|
||
|
||
Once the contents of the tree have been cleaned up, we can finally clean up the
|
||
memory used by ScopeState itself.
|
||
|
||
questions:
|
||
should we build a vcomponent for the root?
|
||
- probably - yes?
|
||
- store the vcomponent in the root dom
|
||
|
||
- 1: Use remove_nodes to use the ensure_drop_safety pathway to safely drop the tree
|
||
- 2: Drop the ScopeState itself
|
||
*/
|
||
impl Drop for VirtualDom {
|
||
fn drop(&mut self) {
|
||
// the best way to drop the dom is to replace the root scope with a dud
|
||
// the diff infrastructure will then finish the rest
|
||
let scope = self.scopes.get_scope(ScopeId(0)).unwrap();
|
||
|
||
// todo: move the remove nodes method onto scopearena
|
||
// this will clear *all* scopes *except* the root scope
|
||
let mut machine = DiffState::new(&self.scopes);
|
||
machine.remove_nodes([scope.root_node()], false);
|
||
|
||
// Now, clean up the root scope
|
||
// safety: there are no more references to the root scope
|
||
let scope = unsafe { &mut *self.scopes.get_scope_raw(ScopeId(0)).unwrap() };
|
||
scope.reset();
|
||
|
||
// make sure there are no "live" components
|
||
for (_, scopeptr) in self.scopes.scopes.get_mut().drain() {
|
||
// safety: all scopes were made in the bump's allocator
|
||
// They are never dropped until now. The only way to drop is through Box.
|
||
let scope = unsafe { bumpalo::boxed::Box::from_raw(scopeptr) };
|
||
drop(scope);
|
||
}
|
||
|
||
for scopeptr in self.scopes.free_scopes.get_mut().drain(..) {
|
||
// safety: all scopes were made in the bump's allocator
|
||
// They are never dropped until now. The only way to drop is through Box.
|
||
let mut scope = unsafe { bumpalo::boxed::Box::from_raw(scopeptr) };
|
||
scope.reset();
|
||
drop(scope);
|
||
}
|
||
}
|
||
}
|