element-plus/es/components/virtual-list/src/builders/build-list.mjs.map

A Component Library for Vue 3

{"version":3,"file":"build-list.mjs","sources":["../../../../../../../packages/components/virtual-list/src/builders/build-list.ts"],"sourcesContent":["import {\n  Fragment,\n  computed,\n  defineComponent,\n  getCurrentInstance,\n  h,\n  mergeProps,\n  nextTick,\n  onActivated,\n  onMounted,\n  onUpdated,\n  ref,\n  resolveDynamicComponent,\n  unref,\n} from 'vue'\nimport { useEventListener } from '@vueuse/core'\nimport { hasOwn, isClient, isNumber, isString } from '@element-plus/utils'\nimport { useNamespace } from '@element-plus/hooks'\nimport { useCache } from '../hooks/use-cache'\nimport useWheel from '../hooks/use-wheel'\nimport Scrollbar from '../components/scrollbar'\nimport { getRTLOffsetType, getScrollDir, isHorizontal } from '../utils'\nimport { virtualizedListProps } from '../props'\nimport {\n  AUTO_ALIGNMENT,\n  BACKWARD,\n  FORWARD,\n  HORIZONTAL,\n  ITEM_RENDER_EVT,\n  RTL,\n  RTL_OFFSET_NAG,\n  RTL_OFFSET_POS_ASC,\n  RTL_OFFSET_POS_DESC,\n  SCROLL_EVT,\n} from '../defaults'\n\nimport type { CSSProperties, Slot, VNode, VNodeChild } from 'vue'\nimport type { Alignment, ListConstructorProps } from '../types'\nimport type { VirtualizedListProps } from '../props'\n\nconst createList = ({\n  name,\n  getOffset,\n  getItemSize,\n  getItemOffset,\n  getEstimatedTotalSize,\n  getStartIndexForOffset,\n  getStopIndexForStartIndex,\n  initCache,\n  clearCache,\n  validateProps,\n}: ListConstructorProps<VirtualizedListProps>) => {\n  return defineComponent({\n    name: name ?? 'ElVirtualList',\n    props: virtualizedListProps,\n    emits: [ITEM_RENDER_EVT, SCROLL_EVT],\n    setup(props, { emit, expose }) {\n      validateProps(props)\n      const instance = getCurrentInstance()!\n\n      const ns = useNamespace('vl')\n\n      const dynamicSizeCache = ref(initCache(props, instance))\n\n      const getItemStyleCache = useCache<CSSProperties>()\n      // refs\n      // here windowRef and innerRef can be type of HTMLElement\n      // or user defined component type, depends on the type passed\n      // by user\n      const windowRef = ref<HTMLElement>()\n      const innerRef = ref<HTMLElement>()\n      const scrollbarRef = ref()\n      const states = ref({\n        isScrolling: false,\n        scrollDir: 'forward',\n        scrollOffset: isNumber(props.initScrollOffset)\n          ? props.initScrollOffset\n          : 0,\n        updateRequested: false,\n        isScrollbarDragging: false,\n        scrollbarAlwaysOn: props.scrollbarAlwaysOn,\n      })\n\n      // computed\n      const itemsToRender = computed(() => {\n        const { total, cache } = props\n        const { isScrolling, scrollDir, scrollOffset } = unref(states)\n\n        if (total === 0) {\n          return [0, 0, 0, 0]\n        }\n\n        const startIndex = getStartIndexForOffset(\n          props,\n          scrollOffset,\n          unref(dynamicSizeCache)\n        )\n        const stopIndex = getStopIndexForStartIndex(\n          props,\n          startIndex,\n          scrollOffset,\n          unref(dynamicSizeCache)\n        )\n\n        const cacheBackward =\n          !isScrolling || scrollDir === BACKWARD ? Math.max(1, cache) : 1\n        const cacheForward =\n          !isScrolling || scrollDir === FORWARD ? Math.max(1, cache) : 1\n\n        return [\n          Math.max(0, startIndex - cacheBackward),\n          Math.max(0, Math.min(total! - 1, stopIndex + cacheForward)),\n          startIndex,\n          stopIndex,\n        ]\n      })\n\n      const estimatedTotalSize = computed(() =>\n        getEstimatedTotalSize(props, unref(dynamicSizeCache))\n      )\n\n      const _isHorizontal = computed(() => isHorizontal(props.layout))\n\n      const windowStyle = computed(() => [\n        {\n          position: 'relative',\n          [`overflow-${_isHorizontal.value ? 'x' : 'y'}`]: 'scroll',\n          WebkitOverflowScrolling: 'touch',\n          willChange: 'transform',\n        },\n        {\n          direction: props.direction,\n          height: isNumber(props.height) ? `${props.height}px` : props.height,\n          width: isNumber(props.width) ? `${props.width}px` : props.width,\n        },\n        props.style,\n      ])\n\n      const innerStyle = computed(() => {\n        const size = unref(estimatedTotalSize)\n        const horizontal = unref(_isHorizontal)\n        return {\n          height: horizontal ? '100%' : `${size}px`,\n          pointerEvents: unref(states).isScrolling ? 'none' : undefined,\n          width: horizontal ? `${size}px` : '100%',\n\n          // fix scrolling issues in Firefox.\n          margin: 0,\n          boxSizing: 'border-box',\n        }\n      })\n\n      const clientSize = computed(() =>\n        _isHorizontal.value ? props.width : props.height\n      )\n\n      // methods\n      const { onWheel } = useWheel(\n        {\n          atStartEdge: computed(() => states.value.scrollOffset <= 0),\n          atEndEdge: computed(\n            () => states.value.scrollOffset >= estimatedTotalSize.value\n          ),\n          layout: computed(() => props.layout),\n        },\n        (offset) => {\n          ;(\n            scrollbarRef.value as {\n              onMouseUp: () => void\n            }\n          ).onMouseUp?.()\n          scrollTo(\n            Math.min(\n              states.value.scrollOffset + offset,\n              estimatedTotalSize.value - (clientSize.value as number)\n            )\n          )\n        }\n      )\n\n      useEventListener(windowRef, 'wheel', onWheel, {\n        passive: false,\n      })\n\n      const emitEvents = () => {\n        const { total } = props\n\n        if (total! > 0) {\n          const [cacheStart, cacheEnd, visibleStart, visibleEnd] =\n            unref(itemsToRender)\n          emit(ITEM_RENDER_EVT, cacheStart, cacheEnd, visibleStart, visibleEnd)\n        }\n\n        const { scrollDir, scrollOffset, updateRequested } = unref(states)\n        emit(SCROLL_EVT, scrollDir, scrollOffset, updateRequested)\n      }\n\n      const scrollVertically = (e: Event) => {\n        const { clientHeight, scrollHeight, scrollTop } =\n          e.currentTarget as HTMLElement\n        const _states = unref(states)\n        if (_states.scrollOffset === scrollTop) {\n          return\n        }\n\n        const scrollOffset = Math.max(\n          0,\n          Math.min(scrollTop, scrollHeight - clientHeight)\n        )\n\n        states.value = {\n          ..._states,\n          isScrolling: true,\n          scrollDir: getScrollDir(_states.scrollOffset, scrollOffset),\n          scrollOffset,\n          updateRequested: false,\n        }\n\n        nextTick(resetIsScrolling)\n      }\n\n      const scrollHorizontally = (e: Event) => {\n        const { clientWidth, scrollLeft, scrollWidth } =\n          e.currentTarget as HTMLElement\n        const _states = unref(states)\n\n        if (_states.scrollOffset === scrollLeft) {\n          return\n        }\n\n        const { direction } = props\n\n        let scrollOffset = scrollLeft\n\n        if (direction === RTL) {\n          // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n          // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n          // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.\n          // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.\n          switch (getRTLOffsetType()) {\n            case RTL_OFFSET_NAG: {\n              scrollOffset = -scrollLeft\n              break\n            }\n            case RTL_OFFSET_POS_DESC: {\n              scrollOffset = scrollWidth - clientWidth - scrollLeft\n              break\n            }\n          }\n        }\n\n        scrollOffset = Math.max(\n          0,\n          Math.min(scrollOffset, scrollWidth - clientWidth)\n        )\n\n        states.value = {\n          ..._states,\n          isScrolling: true,\n          scrollDir: getScrollDir(_states.scrollOffset, scrollOffset),\n          scrollOffset,\n          updateRequested: false,\n        }\n\n        nextTick(resetIsScrolling)\n      }\n\n      const onScroll = (e: Event) => {\n        unref(_isHorizontal) ? scrollHorizontally(e) : scrollVertically(e)\n        emitEvents()\n      }\n\n      const onScrollbarScroll = (distanceToGo: number, totalSteps: number) => {\n        const offset =\n          ((estimatedTotalSize.value - (clientSize.value as number)) /\n            totalSteps) *\n          distanceToGo\n        scrollTo(\n          Math.min(\n            estimatedTotalSize.value - (clientSize.value as number),\n            offset\n          )\n        )\n      }\n\n      const scrollTo = (offset: number) => {\n        offset = Math.max(offset, 0)\n\n        if (offset === unref(states).scrollOffset) {\n          return\n        }\n\n        states.value = {\n          ...unref(states),\n          scrollOffset: offset,\n          scrollDir: getScrollDir(unref(states).scrollOffset, offset),\n          updateRequested: true,\n        }\n\n        nextTick(resetIsScrolling)\n      }\n\n      const scrollToItem = (\n        idx: number,\n        alignment: Alignment = AUTO_ALIGNMENT\n      ) => {\n        const { scrollOffset } = unref(states)\n\n        idx = Math.max(0, Math.min(idx, props.total! - 1))\n        scrollTo(\n          getOffset(\n            props,\n            idx,\n            alignment,\n            scrollOffset,\n            unref(dynamicSizeCache)\n          )\n        )\n      }\n\n      const getItemStyle = (idx: number) => {\n        const { direction, itemSize, layout } = props\n\n        const itemStyleCache = getItemStyleCache.value(\n          clearCache && itemSize,\n          clearCache && layout,\n          clearCache && direction\n        )\n\n        let style: CSSProperties\n        if (hasOwn(itemStyleCache, String(idx))) {\n          style = itemStyleCache[idx]\n        } else {\n          const offset = getItemOffset(props, idx, unref(dynamicSizeCache))\n          const size = getItemSize(props, idx, unref(dynamicSizeCache))\n          const horizontal = unref(_isHorizontal)\n\n          const isRtl = direction === RTL\n          const offsetHorizontal = horizontal ? offset : 0\n          itemStyleCache[idx] = style = {\n            position: 'absolute',\n            left: isRtl ? undefined : `${offsetHorizontal}px`,\n            right: isRtl ? `${offsetHorizontal}px` : undefined,\n            top: !horizontal ? `${offset}px` : 0,\n            height: !horizontal ? `${size}px` : '100%',\n            width: horizontal ? `${size}px` : '100%',\n          }\n        }\n\n        return style\n      }\n\n      // TODO: perf optimization here, reset isScrolling with debounce.\n\n      const resetIsScrolling = () => {\n        states.value.isScrolling = false\n        nextTick(() => {\n          getItemStyleCache.value(-1, null, null)\n        })\n      }\n\n      const resetScrollTop = () => {\n        const window = windowRef.value\n        if (window) {\n          window.scrollTop = 0\n        }\n      }\n\n      // life cycles\n      onMounted(() => {\n        if (!isClient) return\n        const { initScrollOffset } = props\n        const windowElement = unref(windowRef)\n        if (isNumber(initScrollOffset) && windowElement) {\n          if (unref(_isHorizontal)) {\n            windowElement.scrollLeft = initScrollOffset\n          } else {\n            windowElement.scrollTop = initScrollOffset\n          }\n        }\n\n        emitEvents()\n      })\n\n      onUpdated(() => {\n        const { direction, layout } = props\n        const { scrollOffset, updateRequested } = unref(states)\n        const windowElement = unref(windowRef)\n\n        if (updateRequested && windowElement) {\n          if (layout === HORIZONTAL) {\n            if (direction === RTL) {\n              // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n              // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n              // So we need to determine which browser behavior we're dealing with, and mimic it.\n              switch (getRTLOffsetType()) {\n                case RTL_OFFSET_NAG: {\n                  windowElement.scrollLeft = -scrollOffset\n                  break\n                }\n                case RTL_OFFSET_POS_ASC: {\n                  windowElement.scrollLeft = scrollOffset\n                  break\n                }\n                default: {\n                  const { clientWidth, scrollWidth } = windowElement\n                  windowElement.scrollLeft =\n                    scrollWidth - clientWidth - scrollOffset\n                  break\n                }\n              }\n            } else {\n              windowElement.scrollLeft = scrollOffset\n            }\n          } else {\n            windowElement.scrollTop = scrollOffset\n          }\n        }\n      })\n\n      onActivated(() => {\n        unref(windowRef)!.scrollTop = unref(states).scrollOffset\n      })\n\n      const api = {\n        ns,\n        clientSize,\n        estimatedTotalSize,\n        windowStyle,\n        windowRef,\n        innerRef,\n        innerStyle,\n        itemsToRender,\n        scrollbarRef,\n        states,\n        getItemStyle,\n        onScroll,\n        onScrollbarScroll,\n        onWheel,\n        scrollTo,\n        scrollToItem,\n        resetScrollTop,\n      }\n\n      expose({\n        windowRef,\n        innerRef,\n        getItemStyleCache,\n        scrollTo,\n        scrollToItem,\n        resetScrollTop,\n        states,\n      })\n\n      return api\n    },\n\n    render(ctx: any) {\n      const {\n        $slots,\n        className,\n        clientSize,\n        containerElement,\n        data,\n        getItemStyle,\n        innerElement,\n        itemsToRender,\n        innerStyle,\n        layout,\n        total,\n        onScroll,\n        onScrollbarScroll,\n        states,\n        useIsScrolling,\n        windowStyle,\n        ns,\n      } = ctx\n\n      const [start, end] = itemsToRender\n\n      const Container = resolveDynamicComponent(containerElement)\n      const Inner = resolveDynamicComponent(innerElement)\n\n      const children = [] as VNodeChild[]\n\n      if (total > 0) {\n        for (let i = start; i <= end; i++) {\n          children.push(\n            h(\n              Fragment,\n              { key: i },\n              ($slots.default as Slot)?.({\n                data,\n                index: i,\n                isScrolling: useIsScrolling ? states.isScrolling : undefined,\n                style: getItemStyle(i),\n              })\n            )\n          )\n        }\n      }\n\n      const InnerNode = [\n        h(\n          Inner as VNode,\n          mergeProps(ctx.innerProps, {\n            style: innerStyle,\n            ref: 'innerRef',\n          }),\n          !isString(Inner)\n            ? {\n                default: () => children,\n              }\n            : children\n        ),\n      ]\n\n      const scrollbar = h(Scrollbar, {\n        ref: 'scrollbarRef',\n        clientSize,\n        layout,\n        onScroll: onScrollbarScroll,\n        ratio: (clientSize * 100) / this.estimatedTotalSize,\n        scrollFrom:\n          states.scrollOffset / (this.estimatedTotalSize - clientSize),\n        total,\n        alwaysOn: states.scrollbarAlwaysOn,\n      })\n\n      const listContainer = h(\n        Container as VNode,\n        {\n          class: [ns.e('window'), className],\n          style: windowStyle,\n          onScroll,\n          ref: 'windowRef',\n          key: 0,\n        },\n        !isString(Container) ? { default: () => [InnerNode] } : [InnerNode]\n      )\n\n      return h(\n        'div',\n        {\n          key: 0,\n          class: [ns.e('wrapper'), states.scrollbarAlwaysOn ? 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