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/***/ 0:
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "a", function() { return normalizeComponent; });
/* globals __VUE_SSR_CONTEXT__ */

// IMPORTANT: Do NOT use ES2015 features in this file (except for modules).
// This module is a runtime utility for cleaner component module output and will
// be included in the final webpack user bundle.

function normalizeComponent (
  scriptExports,
  render,
  staticRenderFns,
  functionalTemplate,
  injectStyles,
  scopeId,
  moduleIdentifier, /* server only */
  shadowMode /* vue-cli only */
) {
  // Vue.extend constructor export interop
  var options = typeof scriptExports === 'function'
    ? scriptExports.options
    : scriptExports

  // render functions
  if (render) {
    options.render = render
    options.staticRenderFns = staticRenderFns
    options._compiled = true
  }

  // functional template
  if (functionalTemplate) {
    options.functional = true
  }

  // scopedId
  if (scopeId) {
    options._scopeId = 'data-v-' + scopeId
  }

  var hook
  if (moduleIdentifier) { // server build
    hook = function (context) {
      // 2.3 injection
      context =
        context || // cached call
        (this.$vnode && this.$vnode.ssrContext) || // stateful
        (this.parent && this.parent.$vnode && this.parent.$vnode.ssrContext) // functional
      // 2.2 with runInNewContext: true
      if (!context && typeof __VUE_SSR_CONTEXT__ !== 'undefined') {
        context = __VUE_SSR_CONTEXT__
      }
      // inject component styles
      if (injectStyles) {
        injectStyles.call(this, context)
      }
      // register component module identifier for async chunk inferrence
      if (context && context._registeredComponents) {
        context._registeredComponents.add(moduleIdentifier)
      }
    }
    // used by ssr in case component is cached and beforeCreate
    // never gets called
    options._ssrRegister = hook
  } else if (injectStyles) {
    hook = shadowMode
      ? function () {
        injectStyles.call(
          this,
          (options.functional ? this.parent : this).$root.$options.shadowRoot
        )
      }
      : injectStyles
  }

  if (hook) {
    if (options.functional) {
      // for template-only hot-reload because in that case the render fn doesn't
      // go through the normalizer
      options._injectStyles = hook
      // register for functional component in vue file
      var originalRender = options.render
      options.render = function renderWithStyleInjection (h, context) {
        hook.call(context)
        return originalRender(h, context)
      }
    } else {
      // inject component registration as beforeCreate hook
      var existing = options.beforeCreate
      options.beforeCreate = existing
        ? [].concat(existing, hook)
        : [hook]
    }
  }

  return {
    exports: scriptExports,
    options: options
  }
}


/***/ }),

/***/ 14:
/***/ (function(module, exports) {

module.exports = require("@ued_fpi/element-ui/lib/scrollbar");

/***/ }),

/***/ 140:
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
// ESM COMPAT FLAG
__webpack_require__.r(__webpack_exports__);

// CONCATENATED MODULE: ./node_modules/vue-loader/lib/loaders/templateLoader.js??vue-loader-options!./node_modules/vue-loader/lib??vue-loader-options!./packages/virtual-scroller/src/main.vue?vue&type=template&id=088783e3&
var render = function() {
  var _vm = this
  var _h = _vm.$createElement
  var _c = _vm._self._c || _h
  return _c(
    "el-scrollbar",
    { ref: "scrollbar", staticClass: "el-virtual-scroller" },
    [
      _c(
        "div",
        {
          staticClass: "el-virtual-scroller-content",
          style: { height: _vm.data.length * _vm.ceilSize + "px" }
        },
        _vm._l(_vm.list, function(ceil) {
          return _c(
            "div",
            {
              key: ceil[_vm.nodeKey],
              staticClass: "el-virtual-scroller-ceil",
              style: {
                transform:
                  "translateY(" + _vm.ceilSize * ceil._scrollIndex + "px)"
              }
            },
            [
              _vm._t("default", null, null, {
                row: ceil,
                $index: ceil._scrollIndex
              })
            ],
            2
          )
        }),
        0
      )
    ]
  )
}
var staticRenderFns = []
render._withStripped = true


// CONCATENATED MODULE: ./packages/virtual-scroller/src/main.vue?vue&type=template&id=088783e3&

// EXTERNAL MODULE: external "@ued_fpi/element-ui/lib/scrollbar"
var scrollbar_ = __webpack_require__(14);
var scrollbar_default = /*#__PURE__*/__webpack_require__.n(scrollbar_);

// CONCATENATED MODULE: ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib??vue-loader-options!./packages/virtual-scroller/src/main.vue?vue&type=script&lang=js&
//
//
//
//
//
//
//
//
//
//
//
//
//
//


/* harmony default export */ var mainvue_type_script_lang_js_ = ({
  name: 'ElVirtualScroller',
  props: {
    // 需要渲染的数据
    data: {
      type: Array,
      default: function _default() {
        return [];
      }
    },
    // 模式
    mode: {
      type: String,
      default: 'vertical'
    },
    // 单个数据的高度
    ceilSize: {
      type: Number,
      default: 26
    },
    nodeKey: {
      type: String,
      default: 'id'
    },
    // 冗余量
    redundancy: {
      type: Number,
      default: 10
    },
    // 距离边界的标准ceilSize
    boundaryDistance: {
      type: Number,
      default: 5
    }
  },
  data: function data() {
    return {
      list: [], // 实际上被渲染的元素列表
      scrollbarEl: undefined, // 元素
      visibleSize: 0, // 容器大小
      curStartIndex: 0, // 当前显示区域的开始索引(包含了冗余)
      curEndIndex: 0 // 当前显示区域的末尾索引(包含了冗余)
    };
  },

  watch: {
    data: function data() {
      // console.log('watch', new Date().getTime());
      this.renderDom();
    }
  },
  components: {
    ElScrollbar: scrollbar_default.a
  },
  mounted: function mounted() {
    // 根据总数据量和单个节点高度，计算总高度
    // this.totalHeight = this.ceilSize * this.flatData.length
    // 获得当前容器高度
    this.visibleSize = this.$el.offsetHeight;
    this.scrollbarEl = this.$refs.scrollbar.wrap;
    // 添加滚动监听
    this.addListenerScroll();
    this.renderDom();
  },
  beforeDestroy: function beforeDestroy() {
    // 移除事件监听
    this.removeListenerScroll();
  },

  methods: {
    /**
     * 添加滚动条滚动事件监听
     */
    addListenerScroll: function addListenerScroll() {
      this.scrollbarEl.addEventListener('scroll', this.scrollEvent);
    },

    /**
     * 移除滚动条滚动事件监听
     */
    removeListenerScroll: function removeListenerScroll() {
      this.scrollbarEl.removeEventListener('scroll', this.scrollEvent);
    },

    /**
     * 滚动事件,
     * 根据当前滚动的距离，计算需要显示的索引
     */
    scrollEvent: function scrollEvent() {
      // 计算是否靠近边界
      var scrollTop = this.getScrollTop();
      var curIndex = Math.ceil(scrollTop / this.ceilSize);
      // 当前可视区域总数
      var visibleSize = Math.ceil(this.visibleSize / this.ceilSize);

      // 未达到设定的边界值，不用重新渲染

      if (curIndex - this.curStartIndex > this.boundaryDistance && this.curEndIndex - visibleSize - curIndex > this.boundaryDistance) {
        return;
      }

      this.renderDom();
    },

    /**
     * dom渲染方法
    */
    renderDom: function renderDom() {
      var _this = this;

      var scrollTop = this.getScrollTop();
      // 根据滚动距离，计算顶部节点索引
      // 在计算完底部节点索引后，需要在顶部节点的索引基础上加上冗余量
      var startIndex = Math.ceil(scrollTop / this.ceilSize);
      // 根据容器高度，顶部节点索引和冗余量，获取底部节点索引
      this.curEndIndex = Math.ceil(this.visibleSize / this.ceilSize) + startIndex + this.redundancy;
      this.curStartIndex = startIndex - this.redundancy;
      this.list = this.data.filter(function (item, index) {
        item._scrollIndex = index;
        // 实际上渲染的节点
        return index > _this.curStartIndex && index <= _this.curEndIndex;
      });
    },

    /**
     * 获取滚动高度
    */
    getScrollTop: function getScrollTop() {
      return this.$refs.scrollbar.wrap.scrollTop;
    },

    /**
     * 设置滚动高度
    */
    setScrollTop: function setScrollTop() {
      var distance = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;

      this.$refs.scrollbar.wrap.scrollTop = distance;
    }
  }
});
// CONCATENATED MODULE: ./packages/virtual-scroller/src/main.vue?vue&type=script&lang=js&
 /* harmony default export */ var src_mainvue_type_script_lang_js_ = (mainvue_type_script_lang_js_); 
// EXTERNAL MODULE: ./node_modules/vue-loader/lib/runtime/componentNormalizer.js
var componentNormalizer = __webpack_require__(0);

// CONCATENATED MODULE: ./packages/virtual-scroller/src/main.vue





/* normalize component */

var component = Object(componentNormalizer["a" /* default */])(
  src_mainvue_type_script_lang_js_,
  render,
  staticRenderFns,
  false,
  null,
  null,
  null
  
)

/* hot reload */
if (false) { var api; }
component.options.__file = "packages/virtual-scroller/src/main.vue"
/* harmony default export */ var main = (component.exports);
// CONCATENATED MODULE: ./packages/virtual-scroller/index.js


/* istanbul ignore next */
main.install = function (Vue) {
  Vue.component(main.name, main);
};

/* harmony default export */ var virtual_scroller = __webpack_exports__["default"] = (main);

/***/ })

/******/ });