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<script lang="ts"> |
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import { fade } from "svelte/transition"; |
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import { onDestroy } from "svelte"; |
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import IconChevron from "./icons/IconChevron.svelte"; |
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export let scrollNode: HTMLElement; |
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export { className as class }; |
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let visible = false; |
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let className = ""; |
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let observer: ResizeObserver | null = null; |
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$: if (scrollNode) { |
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destroy(); |
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if (window.ResizeObserver) { |
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observer = new ResizeObserver(() => { |
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updateVisibility(); |
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}); |
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observer.observe(scrollNode); |
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} |
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scrollNode.addEventListener("scroll", updateVisibility); |
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} |
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function updateVisibility() { |
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if (!scrollNode) return; |
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visible = |
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Math.ceil(scrollNode.scrollTop) + 200 < scrollNode.scrollHeight - scrollNode.clientHeight; |
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} |
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function destroy() { |
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observer?.disconnect(); |
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scrollNode?.removeEventListener("scroll", updateVisibility); |
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} |
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onDestroy(destroy); |
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</script> |
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{#if visible} |
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<button |
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transition:fade={{ duration: 150 }} |
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on:click={() => scrollNode.scrollTo({ top: scrollNode.scrollHeight, behavior: "smooth" })} |
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class="btn absolute flex h-[41px] w-[41px] rounded-full border bg-white shadow-md transition-all hover:bg-gray-100 dark:border-gray-600 dark:bg-gray-700 dark:shadow-gray-950 dark:hover:bg-gray-600 {className}" |
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><IconChevron classNames="mt-[2px]" /></button |
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> |
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{/if} |
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