mirror of
https://github.com/DioxusLabs/dioxus
synced 2024-12-21 10:03:13 +00:00
62 lines
2 KiB
Rust
62 lines
2 KiB
Rust
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use crate::{
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innerlude::{ComponentPtr, Element, Scope, ScopeId, ScopeState},
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Component,
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};
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use std::cell::{Cell, RefCell};
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/// Virtual Components for custom user-defined components
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/// Only supports the functional syntax
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pub struct VComponent<'src> {
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/// The key of the component to be used during keyed diffing.
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pub key: Option<&'src str>,
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/// The ID of the component.
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/// Will not be assigned until after the component has been initialized.
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pub scope: Cell<Option<ScopeId>>,
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/// An indication if the component is static (can be memozied)
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pub can_memoize: bool,
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/// The function pointer to the component's render function.
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pub user_fc: ComponentPtr,
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/// The actual name of the component.
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pub fn_name: &'static str,
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/// The props of the component.
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pub props: RefCell<Option<Box<dyn AnyProps + 'src>>>,
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}
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pub(crate) struct VComponentProps<P> {
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pub render_fn: Component<P>,
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pub memo: unsafe fn(&P, &P) -> bool,
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pub props: P,
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}
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pub trait AnyProps {
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fn as_ptr(&self) -> *const ();
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fn render<'a>(&'a self, bump: &'a ScopeState) -> Element<'a>;
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unsafe fn memoize(&self, other: &dyn AnyProps) -> bool;
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}
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impl<P> AnyProps for VComponentProps<P> {
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fn as_ptr(&self) -> *const () {
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&self.props as *const _ as *const ()
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}
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// Safety:
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// this will downcast the other ptr as our swallowed type!
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// you *must* make this check *before* calling this method
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// if your functions are not the same, then you will downcast a pointer into a different type (UB)
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unsafe fn memoize(&self, other: &dyn AnyProps) -> bool {
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let real_other: &P = &*(other.as_ptr() as *const _ as *const P);
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let real_us: &P = &*(self.as_ptr() as *const _ as *const P);
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(self.memo)(real_us, real_other)
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}
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fn render<'a>(&'a self, scope: &'a ScopeState) -> Element<'a> {
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let props = unsafe { std::mem::transmute::<&P, &P>(&self.props) };
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(self.render_fn)(Scope { scope, props })
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}
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}
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