tdesign-vue-next
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TDesign Component for vue-next
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{"version":3,"file":"useVirtualScroll.mjs","sources":["../../../components/hooks/useVirtualScroll.ts"],"sourcesContent":["/* eslint-disable */\n/**\n * 当前虚拟滚动存在的问题\n * 1. 反复拖动滚动条，底部会出现奇怪的高度\n * 2. 表格高度发生变化时，底部也会出现奇怪的高度\n * 3. 无法直接定位滚动到某个元素，进而无法实现 Select 组件直接滚动到选中项\n */\nimport { ref, toRefs, reactive, onMounted, computed, watch, nextTick } from 'vue';\n\n// 虚拟滚动Hooks的完整实现，只所以封装成hooks，主要是为了方便跟其他组件搭配使用，比如说表格或者下拉框\nconst useVirtualScroll = ({\n data,\n container,\n fixedHeight = false,\n lineHeight = 30,\n bufferSize = 20,\n threshold = 100,\n}: {\n data: any;\n container: any;\n fixedHeight: boolean;\n lineHeight: number;\n bufferSize: number;\n threshold: number;\n}) => {\n const state = reactive({\n visibleData: [],\n cachedHeight: [],\n cachedScrollY: [],\n });\n const isVirtual = computed(() => data.value.length > threshold);\n const updateId = ref(0);\n const trs = new Map(); // 当前展示的行元素和数据\n\n let visibleCount = 0; // 可见的节点数量\n let beforeScrollTop = 0; // 上一次的滚动条位置\n let index = 0; // 偏移行数\n let offset = 0; // 少于一行行高的偏移量\n let start = 0; // 第一条显示的行\n let last = 0; // 最后一条显示的行\n // let revising = false; // 是否正在修正滚动条\n\n const reset = () => {\n data.value.forEach((item: any, i: number) => {\n item.$index = i;\n if (fixedHeight) {\n state.cachedScrollY[i] = i * lineHeight;\n }\n });\n if (!fixedHeight) {\n state.cachedScrollY[data.value.length - 1] = undefined; // 初始化cachedScrollY数组的长度\n }\n };\n reset();\n\n // 计算虚拟滚动列表总高度，需要动态修正\n const scrollHeight = computed(() => {\n const { cachedHeight } = state;\n const { length } = cachedHeight;\n if (length) {\n const maxScrollY = cachedHeight.reduce((sum, v) => sum + v || lineHeight, 0); // 当前总高度\n if (cachedHeight.length === data.value.length) {\n return maxScrollY;\n }\n const average = maxScrollY / cachedHeight.length; // 平均高度\n return maxScrollY + (data.value.length - cachedHeight.length) * average; // 预估总高度\n }\n return isVirtual.value ? data.value.length * lineHeight : 0;\n });\n const translateY = computed(() => {\n const { visibleData } = state;\n const firstRow = visibleData[0];\n if (firstRow) {\n // 修复只有一个元素时存在偏移的问题\n return visibleData.length === 1 ? 0 : state.cachedScrollY[firstRow.$index];\n }\n return 0;\n });\n\n // 更新可视区域的节点数据\n const updateVisibleData = () => {\n last = Math.min(start + visibleCount + bufferSize * 2, data.value.length);\n state.visibleData = data.value.slice(start, last);\n };\n // 计算每行对应的scrollTop值\n const calculateScrollY = () => {\n const anchorDom = trs.get(index); // 获取锚点元素\n if (!anchorDom) {\n return; // 快速调整高度时，新的元素可能来不及加载，暂时跳过更新\n }\n const anchorDomHeight = anchorDom?.getBoundingClientRect()?.height; // 获取锚点元素的高\n state.cachedScrollY[index] = container.value.scrollTop - offset; // 锚点元素scrollY= 容器滚动高度 - 锚点元素的offset\n state.cachedHeight[index] = anchorDomHeight;\n\n for (let i = index + 1; i <= state.visibleData[state.visibleData.length - 1]?.$index; i++) {\n // 计算锚点后面的元素scrollY\n const tr = trs.get(i);\n const { height } = tr?.getBoundingClientRect() || {};\n state.cachedHeight[i] = height;\n const scrollY = state.cachedScrollY[i - 1] + state.cachedHeight[i - 1]; // 当前元素的y 是前一个元素的y+前一个元素高度\n // state.cachedScrollY[i] = scrollY;\n state.cachedScrollY.splice(i, 1, scrollY); // 兼容vue2的composition api\n }\n\n for (let i = index - 1; i >= state.visibleData[0]?.$index; i--) {\n const tr = trs.get(i);\n const { height } = tr?.getBoundingClientRect() || {};\n state.cachedHeight[i] = height;\n const scrollY = state.cachedScrollY[i + 1] - state.cachedHeight[i]; // 当前元素的y是下一个元素y - 当前元素高度\n // state.cachedScrollY[i] = scrollY;\n state.cachedScrollY.splice(i, 1, scrollY);\n }\n if (state.cachedScrollY[0] > 0) {\n // 修正滚动过快时，滚动到顶部时，滚动条多余的问题\n // revising = true;\n const distance = state.cachedScrollY[0]; // 第一个元素scrollY即为多出的量\n const length = Math.min(last, data.value.length);\n for (let i = 0; i < length; i++) {\n // state.cachedScrollY[i] -= distance;\n state.cachedScrollY.splice(i, 1, state.cachedScrollY[i] - distance);\n }\n\n const scrollTop = state.cachedScrollY[index - 1] ? state.cachedScrollY[index - 1] + offset : offset;\n container.value.scrollTop = scrollTop;\n beforeScrollTop = scrollTop;\n // revising = false;\n }\n // 修正拖动过快时，滚动到顶端时，滚动条不足的偏差\n if (state.cachedScrollY[start] < 0) {\n // revising = true;\n const s = state.cachedHeight.slice(0, Math.max(0, index)).reduce((sum, v) => sum + v, 0) + offset;\n container.value.scrollTop = s;\n beforeScrollTop = s;\n if (s === 0) {\n index = 0;\n offset = 0;\n }\n // revising = false;\n }\n nextTick(() => {\n // setTimeout是为了保证快速拖动到底部时，以下逻辑能够正常执行\n const { scrollTop, scrollHeight, clientHeight } = container.value;\n if (scrollTop + clientHeight === scrollHeight) {\n // 滚动到底部时，修正底部有空余的问题\n // revising = true;\n for (let i = last - 1; i >= start; i--) {\n if (i === last - 1) {\n // state.cachedScrollY[i] = scrollHeight.value - state.cachedHeight[i];\n state.cachedScrollY.splice(i, 1, scrollHeight.value - state.cachedHeight[i]);\n } else {\n // state.cachedScrollY[i] = state.cachedScrollY[i + 1] - state.cachedHeight[i];\n state.cachedScrollY.splice(i, 1, state.cachedScrollY[i + 1] - state.cachedHeight[i]);\n }\n }\n // revising = false;\n }\n });\n };\n\n // 滚动时动态计算和渲染\n const handleScroll = () => {\n if (!isVirtual.value) return;\n // if (revising) {\n // return false; // 修正滚动条时，暂停滚动逻辑\n // }\n const { scrollTop } = container.value;\n let distance = scrollTop - beforeScrollTop; // 滚动差值\n beforeScrollTop = scrollTop;\n distance += offset;\n let lastIndex = index;\n // !disatance 可能为横向滚动，不做任何计算\n if (!distance) return;\n if (distance >= 0) {\n // 向下滚动\n while (lastIndex < data.value.length && distance > (state.cachedHeight[lastIndex] || lineHeight)) {\n if (!state.cachedHeight[lastIndex]) {\n state.cachedHeight[lastIndex] = lineHeight;\n }\n distance -= state.cachedHeight[lastIndex];\n lastIndex++;\n }\n if (lastIndex >= data.value.length) {\n index = data.value.length - 1;\n offset = 0;\n } else {\n index = lastIndex;\n offset = distance;\n }\n const { clientHeight, scrollHeight } = container.value;\n if (scrollTop + clientHeight === scrollHeight) {\n // 滚动条到底了\n index = data.value.length - visibleCount + 1;\n // calculateScrollY();\n }\n if (start <= index - bufferSize) {\n // 计算第一个挂载元素\n start = Math.min(data.value.length - visibleCount, index - bufferSize);\n if (start < 0) {\n start = 0;\n }\n }\n } else {\n // 向上滚动\n while (distance < 0) {\n lastIndex--;\n if (!state.cachedHeight[lastIndex]) {\n state.cachedHeight[lastIndex] = lineHeight;\n }\n distance += state.cachedHeight[lastIndex];\n }\n if (lastIndex < 0) {\n index = 0;\n offset = 0;\n } else {\n index = lastIndex;\n offset = distance;\n }\n calculateScrollY();\n if (start > index - bufferSize) {\n // 计算第一个挂载元素\n start = Math.max(0, index - bufferSize);\n }\n }\n updateVisibleData();\n };\n\n !fixedHeight && watch(updateId, calculateScrollY, { flush: 'post' });\n const handleRowMounted = () => {\n if (!isVirtual.value) return;\n updateId.value++;\n };\n watch(data, () => {\n reset();\n state.visibleData = [];\n state.cachedScrollY = [];\n state.cachedHeight = [];\n beforeScrollTop = 0;\n index = 0;\n offset = 0;\n start = 0;\n // revising = false;\n trs.clear();\n if (data.value.length <= threshold) {\n state.visibleData = data.value;\n } else {\n updateVisibleData();\n }\n\n container.value && (container.value.scrollTop = 0);\n });\n let mounted = false;\n const refreshContainer = () => {\n if (mounted) {\n visibleCount = Math.ceil(container.value.offsetHeight / lineHeight);\n updateVisibleData();\n }\n };\n onMounted(() => {\n if (!window || !window.IntersectionObserver) {\n return;\n }\n const ob = new window.IntersectionObserver((entries) => {\n const entry = entries[0];\n if (entry.isIntersecting || entry.intersectionRatio) {\n mounted = true;\n isVirtual.value && refreshContainer();\n ob.unobserve(container.value);\n }\n });\n container.value && ob.observe(container.value);\n });\n return {\n trs,\n scrollHeight,\n ...toRefs(state),\n 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