Reworked the table scroll

2026-09-09 19:34:30 +02:00
parent d9132fe6ee
commit ca6c9fe38c
7 changed files with 305 additions and 23 deletions
@@ -0,0 +1,168 @@
+<script setup lang="ts">
+import type { ScrollAreaRootProps } from "reka-ui"
+import { onBeforeUnmount, onMounted, ref, toRef, type HTMLAttributes } from "vue"
+import { reactiveOmit, useScroll } from "@vueuse/core"
+import {
+  ScrollAreaCorner,
+  ScrollAreaRoot,
+  ScrollAreaViewport,
+} from "reka-ui"
+import { cn } from "@/lib/utils"
+import ScrollBar from "./ScrollBar.vue"
+
+const props = defineProps<ScrollAreaRootProps & { class?: HTMLAttributes["class"], keepBottom?: boolean }>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const scrollAreaRootRef = ref<{ viewport: HTMLElement } | null>(null)
+const { arrivedState } = useScroll(() => scrollAreaRootRef.value?.viewport)
+const bottom = toRef(arrivedState, 'bottom')
+const isFollowingBottom = ref(props.keepBottom ?? false)
+let isAutoScrolling = false
+let mutationObserver: MutationObserver | null = null
+let resizeObserver: ResizeObserver | null = null
+let followFrame: number | null = null
+let previousScrollTop = 0
+
+const getViewport = () => scrollAreaRootRef.value?.viewport
+const isNearBottom = () => {
+  const viewport = getViewport()
+
+  return viewport ? viewport.scrollHeight - viewport.scrollTop - viewport.clientHeight <= 4 : true
+}
+const handleScroll = () => {
+  const viewport = getViewport()
+  if (!viewport) {
+    return
+  }
+
+  const scrollTop = viewport.scrollTop
+  if (scrollTop < previousScrollTop) {
+    isAutoScrolling = false
+    isFollowingBottom.value = false
+  }
+  previousScrollTop = scrollTop
+
+  if (isAutoScrolling) {
+    if (isNearBottom()) {
+      isAutoScrolling = false
+    }
+    return
+  }
+
+  isFollowingBottom.value = isNearBottom()
+}
+const handleUserScroll = () => {
+  isAutoScrolling = false
+  isFollowingBottom.value = false
+  const viewport = getViewport()
+  viewport?.scrollTo({ top: viewport.scrollTop, behavior: 'auto' })
+}
+const followBottomAfterUpdate = () => {
+  followFrame = null
+  if (isFollowingBottom.value) {
+    scrollToBottom('smooth')
+  }
+}
+const scheduleFollowBottom = () => {
+  if (followFrame === null) {
+    followFrame = requestAnimationFrame(followBottomAfterUpdate)
+  }
+}
+
+const isBottom = () => bottom.value
+const scrollToBottom = (behavior: string = 'auto') => {
+  const viewport = getViewport()
+  if (viewport) {
+    isFollowingBottom.value = true
+    isAutoScrolling = behavior === 'smooth'
+    previousScrollTop = viewport.scrollTop
+    viewport.scrollTo({
+      top: viewport.scrollHeight,
+      behavior: behavior === 'smooth' ? 'smooth' : 'auto',
+    })
+  }
+}
+const followBottom = (force = false) => {
+  if (!force && !isFollowingBottom.value) {
+    return
+  }
+
+  isFollowingBottom.value = true
+  scrollToBottom('smooth')
+}
+const scrollToTop = (behavior: ScrollBehavior = 'smooth') => {
+  const viewport = getViewport()
+  if (viewport) {
+    isAutoScrolling = false
+    isFollowingBottom.value = false
+    viewport.scrollTo({ top: 0, behavior })
+  }
+}
+
+onMounted(() => {
+  const viewport = getViewport()
+  if (!viewport) {
+    return
+  }
+
+  viewport.addEventListener('scroll', handleScroll, { passive: true })
+  viewport.addEventListener('wheel', handleUserScroll, { passive: true })
+  viewport.addEventListener('touchstart', handleUserScroll, { passive: true })
+  mutationObserver = new MutationObserver(() => {
+    if (props.keepBottom) {
+      scheduleFollowBottom()
+    }
+  })
+  mutationObserver.observe(viewport, { childList: true, subtree: true })
+  resizeObserver = new ResizeObserver(scheduleFollowBottom)
+  resizeObserver.observe(viewport)
+
+  if (props.keepBottom) {
+    scrollToBottom()
+  }
+})
+
+onBeforeUnmount(() => {
+  const viewport = getViewport()
+  viewport?.removeEventListener('scroll', handleScroll)
+  viewport?.removeEventListener('wheel', handleUserScroll)
+  viewport?.removeEventListener('touchstart', handleUserScroll)
+  mutationObserver?.disconnect()
+  resizeObserver?.disconnect()
+  if (followFrame !== null) {
+    cancelAnimationFrame(followFrame)
+  }
+})
+
+interface Expose {
+  isBottom: () => boolean
+  isFollowingBottom: typeof isFollowingBottom
+  followBottom: (force?: boolean) => void
+  scrollToBottom: (behavior?: string) => void
+  scrollToTop: (behavior?: ScrollBehavior) => void
+}
+
+defineExpose<Expose>({
+  isBottom,
+  isFollowingBottom,
+  followBottom,
+  scrollToBottom,
+  scrollToTop,
+})
+</script>
+
+<template>
+  <ScrollAreaRoot
+    v-bind="delegatedProps"
+    :class="cn('relative overflow-hidden', props.class)"
+    ref="scrollAreaRootRef"
+  >
+    <ScrollAreaViewport class="h-full w-full overflow-y-auto rounded-[inherit]">
+      <slot />
+    </ScrollAreaViewport>
+    <slot name="overlay" />
+    <ScrollBar />
+    <ScrollAreaCorner />
+  </ScrollAreaRoot>
+</template>