107 lines
3.5 KiB
Rust
107 lines
3.5 KiB
Rust
use crate::{
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any_props::AnyProps,
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bump_frame::BumpFrame,
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innerlude::DirtyScope,
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nodes::RenderReturn,
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scope_context::ScopeContext,
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scopes::{ScopeId, ScopeState},
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virtual_dom::VirtualDom,
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};
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impl VirtualDom {
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pub(super) fn new_scope(
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&mut self,
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props: Box<dyn AnyProps<'static>>,
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name: &'static str,
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) -> &ScopeState {
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let parent_id = self.runtime.current_scope_id();
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let height = parent_id
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.and_then(|parent_id| self.get_scope(parent_id).map(|f| f.context().height + 1))
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.unwrap_or(0);
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let entry = self.scopes.vacant_entry();
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let id = ScopeId(entry.key());
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let scope = entry.insert(Box::new(ScopeState {
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runtime: self.runtime.clone(),
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context_id: id,
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props: Some(props),
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node_arena_1: BumpFrame::new(0),
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node_arena_2: BumpFrame::new(0),
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render_cnt: Default::default(),
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hooks: Default::default(),
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hook_idx: Default::default(),
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borrowed_props: Default::default(),
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attributes_to_drop_before_render: Default::default(),
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element_refs_to_drop: Default::default(),
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}));
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let context =
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ScopeContext::new(name, id, parent_id, height, self.runtime.scheduler.clone());
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self.runtime.create_context_at(id, context);
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scope
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}
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pub(crate) fn run_scope(&mut self, scope_id: ScopeId) -> &RenderReturn {
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self.runtime.scope_stack.borrow_mut().push(scope_id);
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// Cycle to the next frame and then reset it
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// This breaks any latent references, invalidating every pointer referencing into it.
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// Remove all the outdated listeners
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self.ensure_drop_safety(scope_id);
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let new_nodes = unsafe {
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let scope = &self.scopes[scope_id.0];
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scope.previous_frame().reset();
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scope.context().suspended.set(false);
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scope.hook_idx.set(0);
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// safety: due to how we traverse the tree, we know that the scope is not currently aliased
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let props: &dyn AnyProps = scope.props.as_ref().unwrap().as_ref();
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let props: &dyn AnyProps = std::mem::transmute(props);
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let _span = tracing::trace_span!("render", scope = %scope.context().name);
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props.render(scope).extend_lifetime()
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};
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let scope = &self.scopes[scope_id.0];
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// We write on top of the previous frame and then make it the current by pushing the generation forward
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let frame = scope.previous_frame();
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// set the new head of the bump frame
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let allocated = &*frame.bump().alloc(new_nodes);
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frame.node.set(allocated);
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// And move the render generation forward by one
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scope.render_cnt.set(scope.render_cnt.get() + 1);
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let context = scope.context();
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// remove this scope from dirty scopes
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self.dirty_scopes.remove(&DirtyScope {
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height: context.height,
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id: context.id,
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});
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if context.suspended.get() {
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if matches!(allocated, RenderReturn::Aborted(_)) {
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self.suspended_scopes.insert(context.id);
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}
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} else if !self.suspended_scopes.is_empty() {
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_ = self.suspended_scopes.remove(&context.id);
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}
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// rebind the lifetime now that its stored internally
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let result = unsafe { allocated.extend_lifetime_ref() };
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self.runtime.scope_stack.borrow_mut().pop();
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result
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}
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}
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