vuetify/lib/labs/VVirtualScroll/VVirtualScroll.mjs.map

Vue Material Component Framework

{"version":3,"file":"VVirtualScroll.mjs","names":["VVirtualScrollItem","makeDimensionProps","useDimension","useDisplay","useResizeObserver","computed","onMounted","ref","watch","watchEffect","clamp","convertToUnit","createRange","genericComponent","useRender","UP","DOWN","VVirtualScroll","name","props","items","type","Array","default","itemHeight","Number","String","visibleItems","setup","slots","first","baseItemHeight","get","parseInt","value","set","val","rootEl","resizeRef","contentRect","display","sizeMap","Map","sizes","length","map","Math","max","ceil","height","handleItemResize","index","calculateOffset","slice","reduce","curr","calculateMidPointIndex","scrollTop","start","end","middle","floor","middleOffset","lastScrollTop","handleScroll","direction","midPointIndex","buffer","round","scrollToIndex","offset","last","min","computedItems","paddingTop","paddingBottom","dimensionStyles","forEach","item","indexOf","delete"],"sources":["../../../src/labs/VVirtualScroll/VVirtualScroll.tsx"],"sourcesContent":["// Styles\nimport './VVirtualScroll.sass'\n\n// Components\nimport { VVirtualScrollItem } from './VVirtualScrollItem'\n\n// Composables\nimport { makeDimensionProps, useDimension } from '@/composables/dimensions'\nimport { useDisplay } from '@/composables/display'\nimport { useResizeObserver } from '@/composables/resizeObserver'\n\n// Utilities\nimport { computed, onMounted, ref, watch, watchEffect } from 'vue'\nimport {\n  clamp,\n  convertToUnit,\n  createRange,\n  genericComponent,\n  useRender,\n} from '@/util'\n\n// Types\nimport type { SlotsToProps } from '@/util'\n\nconst UP = -1\nconst DOWN = 1\n\nexport interface VVirtualScrollSlot<T> {\n  item: T\n  index: number\n}\n\nexport const VVirtualScroll = genericComponent<new <T>() => {\n  $props: {\n    items: readonly T[]\n  } & SlotsToProps<{\n    default: [VVirtualScrollSlot<T>]\n  }>\n}>()({\n  name: 'VVirtualScroll',\n\n  props: {\n    items: {\n      type: Array,\n      default: () => ([]),\n    },\n    itemHeight: [Number, String],\n    visibleItems: [Number, String],\n\n    ...makeDimensionProps(),\n  },\n\n  setup (props, { slots }) {\n    const first = ref(0)\n    const baseItemHeight = ref(props.itemHeight)\n    const itemHeight = computed({\n      get: () => parseInt(baseItemHeight.value ?? 0, 10),\n      set (val) {\n        baseItemHeight.value = val\n      },\n    })\n    const rootEl = ref<HTMLDivElement>()\n    const { resizeRef, contentRect } = useResizeObserver()\n    watchEffect(() => {\n      resizeRef.value = rootEl.value\n    })\n    const display = useDisplay()\n\n    const sizeMap = new Map<any, number>()\n    let sizes = createRange(props.items.length).map(() => itemHeight.value)\n    const visibleItems = computed(() => {\n      return props.visibleItems\n        ? parseInt(props.visibleItems, 10)\n        : Math.max(12,\n          Math.ceil(((contentRect.value?.height ?? display.height.value) / itemHeight.value) * 1.7 + 1)\n        )\n    })\n\n    function handleItemResize (index: number, height: number) {\n      itemHeight.value = Math.max(itemHeight.value, height)\n      sizes[index] = height\n      sizeMap.set(props.items[index], height)\n    }\n\n    function calculateOffset (index: number) {\n      return sizes.slice(0, index).reduce((curr, value) => curr + (value || itemHeight.value), 0)\n    }\n\n    function calculateMidPointIndex (scrollTop: number) {\n      let start = 0\n      let end = props.items.length\n\n      while (start <= end) {\n        const middle = start + Math.floor((end - start) / 2)\n        const middleOffset = calculateOffset(middle)\n\n        if (middleOffset === scrollTop) {\n          return middle\n        } else if (middleOffset < scrollTop) {\n          start = middle + 1\n        } else if (middleOffset > scrollTop) {\n          end = middle - 1\n        }\n      }\n\n      return start\n    }\n\n    let lastScrollTop = 0\n    function handleScroll () {\n      if (!rootEl.value || !contentRect.value) return\n\n      const height = contentRect.value.height\n      const scrollTop = rootEl.value.scrollTop\n      const direction = scrollTop < lastScrollTop ? UP : DOWN\n\n      const midPointIndex = calculateMidPointIndex(scrollTop + height / 2)\n      const buffer = Math.round(visibleItems.value / 3)\n      if (direction === UP && midPointIndex <= first.value + (buffer * 2) - 1) {\n        first.value = clamp(midPointIndex - buffer, 0, props.items.length)\n      } else if (direction === DOWN && midPointIndex >= first.value + (buffer * 2) - 1) {\n        first.value = clamp(midPointIndex - buffer, 0, props.items.length - visibleItems.value)\n      }\n\n      lastScrollTop = rootEl.value.scrollTop\n    }\n\n    function scrollToIndex (index: number) {\n      if (!rootEl.value) return\n\n      const offset = calculateOffset(index)\n      rootEl.value.scrollTop = offset\n    }\n\n    const last = computed(() => Math.min(props.items.length, first.value + visibleItems.value))\n    const computedItems = computed(() => props.items.slice(first.value, last.value))\n    const paddingTop = computed(() => calculateOffset(first.value))\n    const paddingBottom = computed(() => calculateOffset(props.items.length) - calculateOffset(last.value))\n\n    const { dimensionStyles } = useDimension(props)\n\n    onMounted(() => {\n      if (!itemHeight.value) {\n        // If itemHeight prop is not set, then calculate an estimated height from the average of inital items\n        itemHeight.value = sizes.slice(first.value, last.value).reduce((curr, height) => curr + height, 0) / (visibleItems.value)\n      }\n    })\n\n    watch(() => props.items.length, () => {\n      sizes = createRange(props.items.length).map(() => itemHeight.value)\n      sizeMap.forEach((height, item) => {\n        const index = props.items.indexOf(item)\n        if (index === -1) {\n          sizeMap.delete(item)\n        } else {\n          sizes[index] = height\n        }\n      })\n    })\n\n    useRender(() => (\n      <div\n        ref={ rootEl }\n        class=\"v-virtual-scroll\"\n        onScroll={ handleScroll }\n        style={ dimensionStyles.value }\n      >\n        <div\n          class=\"v-virtual-scroll__container\"\n          style={{\n            paddingTop: convertToUnit(paddingTop.value),\n            paddingBottom: convertToUnit(paddingBottom.value),\n          }}\n        >\n          { computedItems.value.map((item, index) => (\n            <VVirtualScrollItem\n              key={ index }\n              dynamicHeight={ !props.itemHeight }\n              onUpdate:height={ height => handleItemResize(index + first.value, height) }\n            >\n              { slots.default?.({ item, index: index + first.value }) }\n            </VVirtualScrollItem>\n          )) }\n        </div>\n      </div>\n    ))\n\n    return {\n      scrollToIndex,\n    }\n  },\n})\n\nexport type VVirtualScroll = InstanceType<typeof 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