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'./VVirtualTable.sass'\n\n// Components\nimport VSimpleTable from './VSimpleTable'\n\n// Types\nimport { VNode, VNodeChildren } from 'vue'\nimport { PropValidator } from 'vue/types/options'\nimport mixins from '../../util/mixins'\n\n// Utiltiies\nimport { convertToUnit, debounce } from '../../util/helpers'\n\n// Types\nconst baseMixins = mixins(VSimpleTable)\n\ninterface options extends InstanceType<typeof baseMixins> {\n  $refs: {\n    table: HTMLElement\n  }\n  cachedItems: VNodeChildren\n}\n\nexport default baseMixins.extend<options>().extend({\n  name: 'v-virtual-table',\n\n  props: {\n    chunkSize: {\n      type: Number,\n      default: 25,\n    },\n    headerHeight: {\n      type: Number,\n      default: 48,\n    },\n    items: {\n      type: Array,\n      default: () => ([]),\n    } as PropValidator<any[]>,\n    rowHeight: {\n      type: Number,\n      default: 48,\n    },\n  },\n\n  data: () => ({\n    scrollTop: 0,\n    oldChunk: 0,\n    scrollDebounce: null as any,\n    invalidateCache: false,\n  }),\n\n  computed: {\n    itemsLength (): number {\n      return this.items.length\n    },\n    totalHeight (): number {\n      return (this.itemsLength * this.rowHeight) + this.headerHeight\n    },\n    topIndex (): number {\n      return Math.floor(this.scrollTop / this.rowHeight)\n    },\n    chunkIndex (): number {\n      return Math.floor(this.topIndex / this.chunkSize)\n    },\n    startIndex (): number {\n      return Math.max(0, (this.chunkIndex * this.chunkSize) - this.chunkSize)\n    },\n    offsetTop (): number {\n      return Math.max(0, this.startIndex * this.rowHeight)\n    },\n    stopIndex (): number {\n      return Math.min(this.startIndex + (this.chunkSize * 3), this.itemsLength)\n    },\n    offsetBottom (): number {\n      return Math.max(0, (this.itemsLength - this.stopIndex - this.startIndex) * this.rowHeight)\n    },\n  },\n\n  watch: {\n    chunkIndex (newValue, oldValue) {\n      this.oldChunk = oldValue\n    },\n    items () {\n      this.cachedItems = null\n      this.$refs.table.scrollTop = 0\n    },\n  },\n\n  created () {\n    this.cachedItems = null\n  },\n\n  mounted () {\n    this.scrollDebounce = debounce(this.onScroll, 50)\n\n    this.$refs.table.addEventListener('scroll', this.scrollDebounce, { passive: true })\n  },\n\n  beforeDestroy () {\n    this.$refs.table.removeEventListener('scroll', this.scrollDebounce)\n  },\n\n  methods: {\n    createStyleHeight (height: number) {\n      return {\n        height: `${height}px`,\n      }\n    },\n    genBody () {\n      if (this.cachedItems === null || this.chunkIndex !== this.oldChunk) {\n        this.cachedItems = this.genItems()\n        this.oldChunk = this.chunkIndex\n      }\n\n      return this.$createElement('tbody', [\n        this.$createElement('tr', { style: this.createStyleHeight(this.offsetTop) }),\n        this.cachedItems,\n        this.$createElement('tr', { style: this.createStyleHeight(this.offsetBottom) }),\n      ])\n    },\n    genItems () {\n      return this.$scopedSlots.items!({ items: this.items.slice(this.startIndex, this.stopIndex) })\n    },\n    onScroll (e: Event) {\n      const target = e.target as Element\n      this.scrollTop = target.scrollTop\n    },\n    genTable () {\n      return this.$createElement('div', {\n        ref: 'table',\n        staticClass: 'v-virtual-table__table',\n      }, [\n        this.$createElement('table', [\n          this.$slots['body.before'],\n          this.genBody(),\n          this.$slots['body.after'],\n        ]),\n      ])\n    },\n    genWrapper () {\n      return this.$createElement('div', {\n        staticClass: 'v-virtual-table__wrapper',\n        style: {\n          height: convertToUnit(this.height),\n        },\n      }, [\n        this.genTable(),\n      ])\n    },\n  },\n\n  render (h): VNode {\n    return h('div', {\n      staticClass: 'v-data-table v-virtual-table',\n      class: this.classes,\n    }, [\n      this.$slots.top,\n      this.genWrapper(),\n      this.$slots.bottom,\n    ])\n  },\n})\n"],"sourceRoot":"","file":"VVirtualTable.js"}