element-ui/lib/backtop.js

module.exports =
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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, 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 functioal 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
  }
}


/***/ }),

/***/ 108:
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__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/backtop/src/main.vue?vue&type=template&id=257dd4a9&
var render = function() {
  var _vm = this
  var _h = _vm.$createElement
  var _c = _vm._self._c || _h
  return _c("transition", { attrs: { name: "el-fade-in" } }, [
    _vm.visible
      ? _c(
          "div",
          {
            staticClass: "el-backtop",
            style: {
              right: _vm.styleRight,
              bottom: _vm.styleBottom
            },
            on: {
              click: function($event) {
                $event.stopPropagation()
                return _vm.handleClick($event)
              }
            }
          },
          [
            _vm._t("default", [_c("el-icon", { attrs: { name: "caret-top" } })])
          ],
          2
        )
      : _vm._e()
  ])
}
var staticRenderFns = []
render._withStripped = true


// CONCATENATED MODULE: ./packages/backtop/src/main.vue?vue&type=template&id=257dd4a9&

// EXTERNAL MODULE: external "throttle-debounce/throttle"
var throttle_ = __webpack_require__(25);
var throttle_default = /*#__PURE__*/__webpack_require__.n(throttle_);

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



var cubic = function cubic(value) {
  return Math.pow(value, 3);
};
var easeInOutCubic = function easeInOutCubic(value) {
  return value < 0.5 ? cubic(value * 2) / 2 : 1 - cubic((1 - value) * 2) / 2;
};

/* harmony default export */ var mainvue_type_script_lang_js_ = ({
  name: 'ElBacktop',

  props: {
    visibilityHeight: {
      type: Number,
      default: 200
    },
    target: [String],
    right: {
      type: Number,
      default: 40
    },
    bottom: {
      type: Number,
      default: 40
    }
  },

  data: function data() {
    return {
      el: null,
      container: null,
      visible: false
    };
  },


  computed: {
    styleBottom: function styleBottom() {
      return this.bottom + 'px';
    },
    styleRight: function styleRight() {
      return this.right + 'px';
    }
  },

  mounted: function mounted() {
    this.init();
    this.throttledScrollHandler = throttle_default()(300, this.onScroll);
    this.container.addEventListener('scroll', this.throttledScrollHandler);
  },


  methods: {
    init: function init() {
      this.container = document;
      this.el = document.documentElement;
      if (this.target) {
        this.el = document.querySelector(this.target);
        if (!this.el) {
          throw new Error('target is not existed: ' + this.target);
        }
        this.container = this.el;
      }
    },
    onScroll: function onScroll() {
      var scrollTop = this.el.scrollTop;
      this.visible = scrollTop >= this.visibilityHeight;
    },
    handleClick: function handleClick(e) {
      this.scrollToTop();
      this.$emit('click', e);
    },
    scrollToTop: function scrollToTop() {
      var el = this.el;
      var beginTime = Date.now();
      var beginValue = el.scrollTop;
      var rAF = window.requestAnimationFrame || function (func) {
        return setTimeout(func, 16);
      };
      var frameFunc = function frameFunc() {
        var progress = (Date.now() - beginTime) / 500;
        if (progress < 1) {
          el.scrollTop = beginValue * (1 - easeInOutCubic(progress));
          rAF(frameFunc);
        } else {
          el.scrollTop = 0;
        }
      };
      rAF(frameFunc);
    }
  },

  beforeDestroy: function beforeDestroy() {
    this.container.removeEventListener('scroll', this.throttledScrollHandler);
  }
});
// CONCATENATED MODULE: ./packages/backtop/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/backtop/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/backtop/src/main.vue"
/* harmony default export */ var main = (component.exports);
// CONCATENATED MODULE: ./packages/backtop/index.js


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

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

/***/ }),

/***/ 25:
/***/ (function(module, exports) {

module.exports = require("throttle-debounce/throttle");

/***/ })

/******/ });