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✨ feat: Add TOC highlighting effect #215

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✨ feat: Add TOC highlighting effect #215

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eee9f6c
✨ feat: Add TOC highlighting effect
KinhoLeung Oct 30, 2024
01446c6
Merge branch 'saicaca:main' into main
KinhoLeung Nov 11, 2024
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37 changes: 34 additions & 3 deletions src/components/widget/TOC.astro
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Original file line number Diff line number Diff line change
Expand Up @@ -51,9 +51,9 @@ const maxLevel = siteConfig.toc.depth;
---
<div class:list={[className]}>
{headings.filter((heading) => heading.depth < minDepth + maxLevel).map((heading) =>
<a href={`#${heading.slug}`} class="px-2 flex gap-2 relative transition w-full min-h-9 rounded-xl
<a href={`#${heading.slug}`} class="toc-item px-2 flex gap-2 relative transition w-full min-h-9 rounded-xl
hover:bg-[var(--toc-btn-hover)] active:bg-[var(--toc-btn-active)] py-2
">
" data-heading={heading.slug}>
<div class:list={["w-5 h-5 shrink-0 rounded-lg text-xs flex items-center justify-center font-bold",
{
"bg-[var(--toc-badge-bg)] text-[var(--btn-content)]": heading.depth == minDepth,
Expand All @@ -66,10 +66,41 @@ const maxLevel = siteConfig.toc.depth;
{heading.depth == minDepth + 1 && <div class="w-2 h-2 rounded-[0.1875rem] bg-[var(--toc-badge-bg)]"></div>}
{heading.depth == minDepth + 2 && <div class="w-1.5 h-1.5 rounded-sm bg-black/5 dark:bg-white/10"></div>}
</div>
<div class:list={["text-sm", {
<div class:list={["text-sm transition-colors", {
"text-50": heading.depth == minDepth || heading.depth == minDepth + 1,
"text-30": heading.depth == minDepth + 2,
}]}>{removeTailingHash(heading.text)}</div>
</a>
)}
</div>

<script>
const observerOptions = {
root: null,
rootMargin: '0px',
threshold: 1.0
};

const headings = document.querySelectorAll('h1, h2, h3, h4, h5, h6');
const tocItems = document.querySelectorAll('.toc-item');

const observer = new IntersectionObserver((entries) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
// 移除所有当前的高亮
tocItems.forEach(item => {
item.classList.remove('bg-[var(--toc-btn-hover)]');
});

// 添加高亮到当前可见的标题
const id = entry.target.id;
const correspondingTocItem = document.querySelector(`[data-heading="${id}"]`);
if (correspondingTocItem) {
correspondingTocItem.classList.add('bg-[var(--toc-btn-hover)]');
}
}
});
}, observerOptions);

headings.forEach(heading => observer.observe(heading));
</script>