88 lines
3.0 KiB
Rust
88 lines
3.0 KiB
Rust
use crate::{
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any_props::BoxedAnyProps, nodes::RenderReturn, runtime::Runtime, scope_context::Scope,
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};
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use std::{cell::Ref, rc::Rc};
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/// A component's unique identifier.
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///
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/// `ScopeId` is a `usize` that acts a key for the internal slab of Scopes. This means that the key is not unqiue across
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/// time. We do try and guarantee that between calls to `wait_for_work`, no ScopeIds will be recycled in order to give
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/// time for any logic that relies on these IDs to properly update.
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#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
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#[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub struct ScopeId(pub usize);
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impl std::fmt::Debug for ScopeId {
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#[allow(unused_mut)]
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let mut builder = f.debug_tuple("ScopeId");
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let mut builder = builder.field(&self.0);
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#[cfg(debug_assertions)]
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{
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if let Some(name) = Runtime::current()
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.as_ref()
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.and_then(|rt| rt.get_state(*self))
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{
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builder = builder.field(&name.name);
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}
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}
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builder.finish()
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}
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}
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impl ScopeId {
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/// The root ScopeId.
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///
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/// This scope will last for the entire duration of your app, making it convenient for long-lived state
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/// that is created dynamically somewhere down the component tree.
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///
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/// # Example
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///
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/// ```rust, ignore
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/// use dioxus_signals::*;
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/// let my_persistent_state = Signal::new_in_scope(ScopeId::ROOT, String::new());
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/// ```
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pub const ROOT: ScopeId = ScopeId(0);
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}
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/// A component's rendered state.
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///
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/// This state erases the type of the component's props. It is used to store the state of a component in the runtime.
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pub struct ScopeState {
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pub(crate) runtime: Rc<Runtime>,
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pub(crate) context_id: ScopeId,
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pub(crate) last_rendered_node: Option<RenderReturn>,
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pub(crate) props: BoxedAnyProps,
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}
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impl Drop for ScopeState {
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fn drop(&mut self) {
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self.runtime.remove_scope(self.context_id);
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}
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}
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impl ScopeState {
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/// Get a handle to the currently active head node arena for this Scope
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///
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/// This is useful for traversing the tree outside of the VirtualDom, such as in a custom renderer or in SSR.
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///
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/// Panics if the tree has not been built yet.
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pub fn root_node(&self) -> &RenderReturn {
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self.try_root_node()
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.expect("The tree has not been built yet. Make sure to call rebuild on the tree before accessing its nodes.")
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}
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/// Try to get a handle to the currently active head node arena for this Scope
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///
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/// This is useful for traversing the tree outside of the VirtualDom, such as in a custom renderer or in SSR.
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///
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/// Returns [`None`] if the tree has not been built yet.
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pub fn try_root_node(&self) -> Option<&RenderReturn> {
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self.last_rendered_node.as_ref()
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}
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pub(crate) fn state(&self) -> Ref<'_, Scope> {
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self.runtime.get_state(self.context_id).unwrap()
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}
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}
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