euv_core/reactive/hook/
struct.rs

1use super::*;
2
3/// Internal storage for hook state, holding boxed `Any` values.
4///
5/// This struct is not exposed directly; use `HookContext` instead.
6/// The `arm_changed` flag tracks whether a `match` arm switch occurred;
7/// when toggled, the hook array is cleared to prevent signal leakage
8/// between different match arms.
9#[derive(CustomDebug, Data, Default, New)]
10pub struct HookContextInner {
11    /// Storage for hook state values (signals, etc.).
12    #[debug(skip)]
13    pub hooks: Vec<Box<dyn Any>>,
14    /// The match arm index from the last render.
15    #[get(type(copy))]
16    pub arm_changed: usize,
17    /// Current hook index, incremented on each hook call and reset per render.
18    #[get(type(copy))]
19    pub hook_index: usize,
20    /// Cleanup closures registered by hooks (e.g., `use_signal`) that must
21    /// be executed when the hook context is cleared due to a `match` arm
22    /// switch.
23    #[debug(skip)]
24    pub cleanups: Vec<Box<dyn FnOnce()>>,
25}
26
27/// Manages hook state across render cycles for a DynamicNode.
28///
29/// Stores boxed `Any` values keyed by hook call order, enabling `use_signal`
30/// and similar hooks to persist state between re-renders of the same
31/// dynamic node.
32///
33/// Implements `Clone` for ergonomic use; all clones share the same underlying state.
34#[derive(CustomDebug, Data, New)]
35pub struct HookContext {
36    /// Shared reference to the heap-allocated hook context inner state.
37    #[debug(skip)]
38    pub inner: Rc<RefCell<HookContextInner>>,
39}
40
41/// A handle to a browser interval timer created by `use_interval`.
42///
43/// Stores the numeric interval ID returned by `window.setInterval` so the
44/// timer can be cancelled later via `clear_interval`.
45#[derive(Clone, Copy, Data, Debug, Default, Eq, Hash, New, Ord, PartialEq, PartialOrd)]
46pub struct IntervalHandle {
47    /// The interval ID assigned by the browser.
48    #[get(type(copy))]
49    pub(crate) interval_id: i32,
50}
euv_core/reactive/hook/struct.rs

euv_core/reactive/hook/
struct.rs
