{"version":3,"file":"virtual-scroll-list-otmacS0b.mjs","sources":["../../../../packages/components/virtual-scroll-list/src/props.ts","../../../../packages/components/virtual-scroll-list/src/virtual.ts","../../../../packages/components/virtual-scroll-list/src/virtual-item.tsx","../../../../packages/components/virtual-scroll-list/src/virtual-list.tsx","../../../../packages/components/virtual-scroll-list/index.ts"],"sourcesContent":["import type { DefineComponent, ExtractPropTypes, PropType } from 'vue';\n\n/**\n * 滚动方向 (向上 / 向下)\n */\nexport const virtualScrollDirection = ['front', 'behind'] as const;\n\nexport type VirtualScrollDirection = (typeof virtualScrollDirection)[number];\n\nexport type RangeOptions = {\n start: number;\n end: number;\n padFront: number;\n padBehind: number;\n};\n\nexport type VirtualOptions = {\n keeps: number;\n cache: number;\n estimatedRowHeight: number;\n uniqueIds: string[];\n};\n\nexport type UpdateType = (range: RangeOptions) => void;\n\nexport const virtualProps = {\n /**\n * 数据源\n */\n dataSource: {\n type: Array,\n required: true,\n default: () => []\n },\n /**\n * 每一项数据的 key\n */\n dataKey: {\n type: String,\n required: true\n },\n /**\n * 渲染多少条数据 (存在真实 dom)\n */\n keeps: {\n type: Number,\n default: 30\n },\n /**\n * 每一条数据预估高度\n */\n estimatedRowHeight: {\n type: Number,\n default: 80\n },\n /**\n * 每一行的数据组件\n */\n dataComponent: {\n type: [Object, Function] as PropType<\n DefineComponent\n >,\n required: true\n },\n /**\n * 数据渲染缓冲区 (基于视口顶部 top 的数据所在位置, top ~ top + cache 为缓冲区)\n *\n * start = 10 cache = 5 end = 20\n * - 向下滚动时, 当 top 处于 10 ~ 15, 不做处理,\n * 当 top > 15, 将 start 赋为 15, 从而 end = 25(即往后渲染 cache 条数据)\n * - 向上滚动时, 当 top 处于 10 ~ 15, 不做处理,\n * 当 top < 10, 将 start 赋为 5, 从而 end = 15(即往前渲染 cache 条数据)\n */\n cache: {\n type: Number,\n default: 2\n }\n} as const;\n\nexport type VirtualProps = ExtractPropTypes;\n\nexport const virtualItemProps = {\n uniqueKey: {\n type: [String, Number] as PropType,\n required: true\n },\n source: {\n type: Object,\n required: true\n },\n component: {\n type: [Object, Function] as PropType<\n DefineComponent<{ source: object }, object, unknown>\n >\n }\n} as const;\n\nexport type VirtualItemProps = ExtractPropTypes;\n\nexport const virtualItemEmits = {\n itemResize: (id: number | string, size: number) =>\n typeof size === 'number' &&\n (typeof id === 'number' || typeof id === 'string')\n};\n\nexport type VirtualItemEmits = ExtractPropTypes;\n","import type {\n RangeOptions,\n UpdateType,\n VirtualOptions,\n VirtualScrollDirection\n} from './props';\n\n// 固定高度\n// 1. 上 padding 利用 开始范围前面的数据个数 * 每项高度\n// 2. 下 padding 利用 (总个数 - 当前显示到的个数) * 每项高度\n// 动态高度 (根据已经渲染出的数据先预估滚动条高度)\n// 1. 上 padding 根据当前 start 来累加 start 之前每一项的高度\n// 2. 下 padding 利用 (总个数 - 当前显示到的个数) * 预估高度\n// 当开始滚动时, 固定高度直接采用 偏移量 / 每项高度 计算数据在视口的起始位置\n// 动态高度则采用二分查找, 取已经加载的数据项的偏移量和当前偏移量最接近的那一项\n\nenum CALC_TYPE {\n /**\n * 初始高度\n */\n INIT = 'init',\n /**\n * 固定高度\n */\n FIXED = 'fixed',\n /**\n * 动态高度\n */\n DYNAMIC = 'dynamic'\n}\n\nexport function initVirtual(options: VirtualOptions, update: UpdateType) {\n const range: RangeOptions = {\n start: 0,\n end: 0,\n padBehind: 0,\n padFront: 0\n };\n /* 未滚动前的偏移量 */\n let offsetValue = 0;\n /* 每一项渲染过后的实际高度 */\n const sizes = new Map();\n let calcType = CALC_TYPE.INIT;\n let fixedSizeVal = 0;\n /* 一开始时每一项的预估高度 */\n let firstRangeAvg: number;\n\n function isFixed() {\n return calcType === CALC_TYPE.FIXED;\n }\n\n function getEstimatedRowHeight() {\n return isFixed()\n ? fixedSizeVal\n : firstRangeAvg || options.estimatedRowHeight;\n }\n\n /**\n * 获取 index 处数据的偏移量\n */\n function getIndexOffset(idx: number) {\n if (!idx) return 0;\n let offset = 0;\n for (let i = 0; i < idx; i++) {\n const indexSize = sizes.get(options.uniqueIds[i]);\n offset +=\n typeof indexSize === 'number'\n ? indexSize\n : getEstimatedRowHeight();\n }\n return offset;\n }\n\n /**\n * 获取上 padding\n */\n function getPadFront() {\n if (isFixed()) {\n return getEstimatedRowHeight() * range.start;\n } else {\n return getIndexOffset(range.start);\n }\n }\n\n /**\n * 获取下 padding\n */\n function getPadBehind() {\n const lastIndex = options.uniqueIds.length - 1;\n return (lastIndex - range.end) * getEstimatedRowHeight();\n }\n\n /**\n * 更新范围\n */\n function updateRange(start: number, end: number) {\n range.start = start;\n range.end = end;\n range.padFront = getPadFront();\n range.padBehind = getPadBehind();\n update({ ...range });\n }\n\n /**\n * 范围检查\n */\n function checkRange(start: number, end: number) {\n const total = options.uniqueIds.length;\n const keeps = options.keeps;\n if (total < keeps) {\n start = 0;\n end = total - 1;\n } else if (end - start < keeps - 1) {\n start = end - keeps + 1;\n }\n updateRange(start, end);\n }\n\n /**\n * 获取滚动了多少条数据\n */\n function getScrollOvers() {\n if (isFixed()) {\n return Math.floor(offsetValue / getEstimatedRowHeight());\n } else {\n let l = 0;\n let r = options.uniqueIds.length;\n let mid = 0;\n let midOffset = 0;\n while (l < r) {\n mid = l + Math.floor((r - l) / 2);\n midOffset = getIndexOffset(mid);\n if (midOffset === offsetValue) {\n return mid;\n } else if (midOffset < offsetValue) {\n l = mid + 1;\n } else {\n r = mid - 1;\n }\n }\n return l > 0 ? --l : 0;\n }\n }\n\n function getEndByStart(start: number) {\n const computedEnd = start + options.keeps - 1;\n const end = Math.min(computedEnd, options.uniqueIds.length - 1);\n return end;\n }\n\n /**\n * 向上滚动 ( start 的更新 )\n */\n function handleFront() {\n const overs = getScrollOvers();\n if (overs > range.start) {\n // start = 10, end = 40, cache = 10\n // 但滚动到了15个, 此时无需更新 start (属于 start--cache 范围(缓冲区)内滚动)\n return;\n }\n const start = Math.max(0, overs - options.cache);\n checkRange(start, getEndByStart(start));\n }\n\n /**\n * 向下滚动\n */\n function handleBehind() {\n const overs = getScrollOvers();\n if (overs < range.start + options.cache) {\n return;\n }\n checkRange(overs, getEndByStart(overs));\n }\n\n function handleScroll(offset: number) {\n const direction: VirtualScrollDirection =\n offset < offsetValue ? 'front' : 'behind';\n offsetValue = offset;\n if (direction === 'front') {\n handleFront();\n } else if (direction === 'behind') {\n handleBehind();\n }\n }\n\n function saveSize(id: number | string, size: number) {\n sizes.set(id, size);\n\n // 第一条数据加载完后拿到其高度, 如果第二条数据高度与之不同, 则说明是动态高度\n // 否则说明是固定高度(即数据组件设置了 height), 此时便使用 estimatedRowHeight\n if (calcType === CALC_TYPE.INIT) {\n // 第一条数据渲染完后进入这里, 先设置为 fixed 高度\n fixedSizeVal = size;\n calcType = CALC_TYPE.FIXED;\n } else if (calcType === CALC_TYPE.FIXED && fixedSizeVal !== size) {\n // 第二条数据渲染完后如果高度和第一条数据不一样, 便会进入这里, 设置为 dynamic 高度\n calcType = CALC_TYPE.DYNAMIC;\n fixedSizeVal = 0;\n }\n\n // 如果是动态高度, 则根据已加载的数据高度算出平均值, 撑开滚动条\n if (calcType === CALC_TYPE.DYNAMIC) {\n // 判断条件保证只在初始的时候计算每一项的预估高度\n if (\n sizes.size < Math.min(options.keeps, options.uniqueIds.length)\n ) {\n firstRangeAvg = Math.round(\n [...sizes.values()].reduce((acc, val) => acc + val, 0) /\n sizes.size\n );\n }\n }\n }\n\n checkRange(0, options.keeps - 1);\n\n return {\n handleScroll,\n saveSize\n };\n}\n","import { defineComponent, onMounted, onUpdated, ref } from 'vue';\nimport { virtualItemEmits, virtualItemProps } from './props';\n\nexport default defineComponent({\n name: 'virtual-item',\n props: virtualItemProps,\n emits: virtualItemEmits,\n setup(props, { emit }) {\n const rootRef = ref();\n\n function dispatchEvent() {\n emit('itemResize', props.uniqueKey!, rootRef.value!.offsetHeight);\n }\n\n onMounted(() => {\n dispatchEvent();\n });\n\n onUpdated(() => {\n dispatchEvent();\n });\n\n return () => {\n const { component: Comp, source, uniqueKey } = props;\n return (\n Comp && (\n
\n \n
\n )\n );\n };\n }\n});\n","import { defineComponent, h, onBeforeMount, ref } from 'vue';\nimport { virtualProps } from './props';\nimport type { RangeOptions } from './props';\nimport { initVirtual } from './virtual';\nimport virtualItem from './virtual-item';\n\nexport default defineComponent({\n name: 'mc-virtual-scroll-list',\n props: virtualProps,\n setup(props) {\n const range = ref(null);\n let virtual: ReturnType;\n\n const getUniqueIdFromDataSource = (): string[] => {\n const { dataSource, dataKey } = props;\n return dataSource.map(\n item => (item as object)[dataKey as keyof typeof item]\n ) as string[];\n };\n\n const update = (newRange: RangeOptions) => {\n range.value = newRange;\n };\n\n const installVirtual = () => {\n virtual = initVirtual(\n {\n keeps: props.keeps,\n cache: props.cache || Math.round(props.keeps / 3),\n uniqueIds: getUniqueIdFromDataSource(),\n estimatedRowHeight: props.estimatedRowHeight\n },\n update\n );\n };\n\n onBeforeMount(() => {\n installVirtual();\n });\n\n function onItemResize(id: string | number, size: number) {\n virtual.saveSize(id, size);\n }\n\n function genRenderComponent() {\n const slots = [];\n const { start, end } = range.value!;\n const { dataSource, dataComponent, dataKey } = props;\n for (let index = start; index <= end; index++) {\n const data = dataSource[index];\n const key = (data as object)[dataKey as keyof typeof data];\n if (data) {\n slots.push(\n h(virtualItem, {\n uniqueKey: key,\n source: data,\n component: dataComponent,\n onItemResize: onItemResize\n })\n );\n }\n }\n return slots;\n }\n\n const rootRef = ref();\n function onScroll() {\n if (rootRef.value) {\n const offset = rootRef.value.scrollTop;\n virtual.handleScroll(offset);\n }\n }\n\n return () => {\n const { padFront, padBehind } = range.value!;\n const paddingStyle = {\n padding: `${padFront}px 0 ${padBehind}px`\n };\n\n return (\n \n
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