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perf(editor): reduce long-document decoration work and fix fold navigation

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admin
2026-09-06 14:30:56 +08:00
parent 750e17212e
commit 874e916106
23 changed files with 9398 additions and 54 deletions
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frontend/src/features/editor/codeBlockLabels.ts
+31 -4
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@@ -1,11 +1,38 @@
/** Mirror the live picker label for theme decorations without changing Markdown. */
/** Mirror changed language labels without rescanning every code block on each DOM mutation. */
export function installCodeBlockLabels(root: HTMLElement): () => void {
const sync = () => root.querySelectorAll<HTMLElement>('.milkdown-code-block').forEach(block => {
const sync = (block: HTMLElement) => {
const label = block.querySelector('.language-button')?.textContent?.trim() || 'Plain text'
if (block.dataset.languageLabel !== label) block.dataset.languageLabel = label
}
const discover = (node: Node, blocks: Set<HTMLElement>) => {
if (!(node instanceof HTMLElement)) return
if (node.matches('.milkdown-code-block')) blocks.add(node)
node.querySelectorAll<HTMLElement>('.milkdown-code-block').forEach(block => blocks.add(block))
}
const observer = new MutationObserver(records => {
const changed = new Set<HTMLElement>()
for (const record of records) {
const element = record.target instanceof Element ? record.target : record.target.parentElement
// CodeMirror viewport/text changes do not change the footer's language.
const label = element?.closest('.language-button')
const block = label?.closest<HTMLElement>('.milkdown-code-block')
if (block) changed.add(block)
if ([...record.removedNodes].some(node => node instanceof Element &&
(node.matches('.language-button') || node.querySelector('.language-button')))) {
const owner = element?.closest<HTMLElement>('.milkdown-code-block')
if (owner) changed.add(owner)
}
for (const node of record.addedNodes) {
discover(node, changed)
if (node instanceof Element && (node.matches('.language-button') || node.querySelector('.language-button'))) {
const owner = node.closest<HTMLElement>('.milkdown-code-block')
if (owner) changed.add(owner)
}
}
}
changed.forEach(block => { if (root.contains(block)) sync(block) })
})
const observer = new MutationObserver(sync)
root.querySelectorAll<HTMLElement>('.milkdown-code-block').forEach(sync)
observer.observe(root, { subtree: true, childList: true, characterData: true })
sync()
return () => observer.disconnect()
}