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[组件-下载视频] feat: 引入了虚拟列表来改善列表太长时操作卡顿的问题 #4455
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156 changes: 156 additions & 0 deletions
156
registry/lib/components/video/download/inputs/VirtualList.vue
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| <script setup lang="ts"> | ||
| import { ref, computed, watch, onMounted } from 'vue' | ||
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| type PropsType = { | ||
| items: any[] | ||
| itemHeight: number | ||
| stageItemCount?: number // 容器容纳的列表项数量 | ||
| bufferItemCount?: number // 边缘预留缓冲的列表项数量 | ||
| updateRequiredItemCount?: number // 缓冲列表项低于此数时触发更新 | ||
| focuseItemIndex?: number // 初始聚焦的列表项 | ||
| } | ||
|
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||
| const props = withDefaults(defineProps<PropsType>(), { | ||
| stageItemCount: 50, | ||
| bufferItemCount: 5, | ||
| updateRequiredItemCount: 5, | ||
| focuseItemIndex: 0, | ||
| }) | ||
|
|
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| const container = ref<HTMLDivElement>() | ||
| const stageHeight = computed(() => props.stageItemCount * props.itemHeight) | ||
| const clientHeight = computed(() => container.value?.clientHeight ?? 0) | ||
| // const scrollHeight = computed(() => container.value?.scrollHeight ?? 0) | ||
|
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||
| const ptr = ref(0) | ||
| const appendPaddingTop = computed(() => ptr.value * props.itemHeight) | ||
| const appendPaddingBottom = computed(() => { | ||
| return (props.items.length - ptr.value - props.stageItemCount) * props.itemHeight | ||
| }) | ||
| const activatedItems = computed(() => { | ||
| return props.items.slice(ptr.value, ptr.value + props.stageItemCount) | ||
| }) | ||
|
|
||
| const forceScrolling = ref(false) | ||
| const lastScrollTop = ref(0) | ||
|
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| /** | ||
| * 在 stage 之内移动 viewport，不引起数据变化 | ||
| * @param top float | ||
| */ | ||
| const moveViewport = (top: number) => { | ||
| if (top < 0) { | ||
| top = 0 | ||
| } else if (top > stageHeight.value - clientHeight.value) { | ||
| top = stageHeight.value - clientHeight.value | ||
| } | ||
| // 滚动列表 | ||
| forceScrolling.value = true | ||
| container.value?.scrollTo({ | ||
| top: appendPaddingTop.value + top, | ||
| behavior: 'instant', | ||
| }) | ||
|
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||
| return top | ||
| } | ||
|
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| /** | ||
| * 在虚拟列表之内移动 stage，引起数据变化 | ||
| * @param index int | ||
| */ | ||
| const moveStage = (index: number) => { | ||
| if (index < 0) { | ||
| index = 0 | ||
| } else if (index > props.items.length - props.stageItemCount) { | ||
| index = props.items.length - props.stageItemCount | ||
| } | ||
| // 触发内容变化并推动列表 | ||
| return (ptr.value = index) | ||
| } | ||
|
|
||
| /** | ||
| * 将 viewport 对齐到指定元素 | ||
| * @param index | ||
| * @param alignment 决定用顶部还是底部对齐 | ||
| */ | ||
| const focus = (index: number, alignment: 'top' | 'bottom' = 'top') => { | ||
| if (alignment === 'top') { | ||
| const offset = index - moveStage(index - props.bufferItemCount) | ||
| moveViewport(offset * props.itemHeight) | ||
| } else if (alignment === 'bottom') { | ||
| const offset = index - moveStage(index + props.bufferItemCount - props.stageItemCount) | ||
| moveViewport(offset * props.itemHeight) | ||
| } | ||
| } | ||
|
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||
| onMounted(() => { | ||
| setTimeout(() => focus(props.focuseItemIndex)) | ||
| }) | ||
|
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| watch( | ||
| () => props.focuseItemIndex, | ||
| newv => { | ||
| focus(newv) | ||
| }, | ||
| ) | ||
|
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||
| const onScroll = lodash.throttle((event: Event) => { | ||
| if (forceScrolling.value) { | ||
| // 手动触发滚动时不做处理 | ||
| forceScrolling.value = false | ||
| return | ||
| } | ||
|
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||
| const tar = event.currentTarget as HTMLDivElement | ||
| const step = tar.scrollTop - lastScrollTop.value | ||
| // console.log(tar.scrollHeight, tar.scrollTop, step) | ||
| lastScrollTop.value = tar.scrollTop | ||
| if (step > 0) { | ||
| // 向下滚动 | ||
| const actualBottomHeight = tar.scrollTop + tar.clientHeight | ||
| const contentBottomHeight = appendPaddingTop.value + stageHeight.value | ||
| const buffer = contentBottomHeight - actualBottomHeight | ||
| const min = props.itemHeight * props.updateRequiredItemCount | ||
| if (buffer < min) { | ||
| const offset = props.bufferItemCount - Math.round(buffer / props.itemHeight) | ||
| moveStage(ptr.value + offset) | ||
| } | ||
| } else if (step < 0) { | ||
| // 向上滚动 | ||
| const actualTopHeight = tar.scrollHeight - tar.scrollTop | ||
| const contentTopHeight = tar.scrollHeight - appendPaddingTop.value | ||
| const buffer = contentTopHeight - actualTopHeight | ||
| const min = props.itemHeight * props.updateRequiredItemCount | ||
| if (buffer < min) { | ||
| const offset = props.bufferItemCount - Math.round(buffer / props.itemHeight) | ||
| moveStage(ptr.value - offset) | ||
| } | ||
| } | ||
| }, 33) | ||
| </script> | ||
|
|
||
| <template> | ||
| <div class="virtual-list" ref="container" @scroll.self="onScroll"> | ||
| <ul class="scroll-box"> | ||
| <li class="list-item" v-for="(item, index) in activatedItems" :key="index"> | ||
| <slot name="item" :item="item" :index="index"></slot> | ||
| </li> | ||
| </ul> | ||
| </div> | ||
| </template> | ||
|
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| <style scoped> | ||
| .virtual-list { | ||
| overflow-x: hidden; | ||
| overflow-y: auto; | ||
|
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| > .scroll-box { | ||
| list-style: none; | ||
| padding-top: v-bind('`${appendPaddingTop}px`'); | ||
| padding-bottom: v-bind('`${appendPaddingBottom}px`'); | ||
|
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||
| > .list-item { | ||
| } | ||
| } | ||
| } | ||
| </style> |
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限制为 1 行的话, 建议加一个 title, 鼠标停留时可以看到完整标题