50 lines
1.4 KiB
Svelte
50 lines
1.4 KiB
Svelte
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<script>
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import { onMount } from 'svelte';
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import { scrollBreadcrumbsStore } from '../../model';
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import BreadcrumbHeader from './BreadcrumbHeader.svelte';
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const sections = [
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{ index: 100, title: 'Introduction' },
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{ index: 101, title: 'Typography' },
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{ index: 102, title: 'Spacing' },
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];
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/** @type {HTMLDivElement} */
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let container;
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onMount(() => {
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for (const section of sections) {
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const el = /** @type {HTMLElement} */ (container.querySelector(`[data-story-index="${section.index}"]`));
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scrollBreadcrumbsStore.add({ index: section.index, title: section.title, element: el }, 96);
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}
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/*
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* Scroll past the sections so IntersectionObserver marks them as
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* scrolled-past, making scrolledPastItems non-empty and the header visible.
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*/
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setTimeout(() => {
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window.scrollTo({ top: 2000, behavior: 'instant' });
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}, 100);
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return () => {
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for (const { index } of sections) {
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scrollBreadcrumbsStore.remove(index);
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}
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window.scrollTo({ top: 0, behavior: 'instant' });
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};
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});
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</script>
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<div bind:this={container} style="height: 2400px; padding-top: 900px;">
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{#each sections as section}
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<div
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data-story-index={section.index}
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style="height: 400px; padding: 2rem; background: #f5f5f5; margin-bottom: 1rem;"
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>
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{section.title} — scroll up to see the breadcrumb header
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</div>
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{/each}
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</div>
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<BreadcrumbHeader />
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