Demonthos
047ed1e553
This commit adds subtree memoization to Dioxus. Subtree memoization is basically a compile-time step that drastically reduces the amount of work the diffing engine needs to do at runtime by extracting non-changing nodes out into a static "template." Templates are then understood by the various renderers in the ecosystem as a faster way of rendering the same items. For example, in the web, templates are simply a set of DOM Nodes created once and then cloned later. This is the same pattern frameworks like Lithtml and SolidJS use to achieve near-perfect performance. Subtree memoization adds an additional level of complexity to Dioxus. The RSX macro needs to be much smarter to identify changing/nonchanging nodes and generate a mapping between the Template and its runtime counterparts. This commit represents a working starter point for this work, adding support for templates for the web, desktop, liveview, ssr, and native-core renderers. In the future we will try to shrink code generation, generally improve performance, and simplify our implementation.
74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
#![allow(unused, non_upper_case_globals, non_snake_case)]
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//! Prove that the dom works normally through virtualdom methods.
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//!
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//! This methods all use "rebuild" which completely bypasses the scheduler.
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//! Hard rebuilds don't consume any events from the event queue.
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use dioxus::prelude::*;
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use dioxus_core::{DomEdit::*, ScopeId};
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const IS_LOGGING_ENABLED: bool = false;
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fn new_dom<P: 'static + Send>(app: Component<P>, props: P) -> VirtualDom {
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VirtualDom::new_with_props(app, props)
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}
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/// This test ensures that if a component aborts early, it is replaced with a placeholder.
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/// In debug, this should also toss a warning.
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#[test]
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fn test_early_abort() {
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const app: Component = |cx| {
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let val = cx.use_hook(|| 0);
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*val += 1;
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if *val == 2 {
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return None;
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}
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render!(div { "Hello, world!" })
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};
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let mut dom = new_dom(app, ());
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let edits = dom.rebuild();
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assert_eq!(
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edits.edits,
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[
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CreateTemplate { id: 0 },
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CreateElementTemplate {
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root: 4503599627370495,
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tag: "div",
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locally_static: true,
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fully_static: true
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},
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CreateTextNodeTemplate {
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root: 4503599627370496,
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text: "Hello, world!",
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locally_static: true
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},
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AppendChildren { many: 1 },
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FinishTemplate { len: 1 },
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CreateTemplateRef { id: 1, template_id: 0 },
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AppendChildren { many: 1 }
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]
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);
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let edits = dom.hard_diff(ScopeId(0));
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assert_eq!(
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edits.edits,
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[CreatePlaceholder { root: 2 }, ReplaceWith { root: 1, m: 1 },],
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);
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let edits = dom.hard_diff(ScopeId(0));
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assert_eq!(
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edits.edits,
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[
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CreateTemplateRef { id: 1, template_id: 0 }, // gets reused
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ReplaceWith { root: 2, m: 1 }
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]
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);
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}
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