import * as _vue from "vue";

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import PropTypes from '../_util/vue-types';
import BaseMixin from '../_util/BaseMixin';
import classnames from '../_util/classNames';
import raf from 'raf';
import { findDOMNode } from '../_util/props-util';

function noop() {}

var scrollTo = function scrollTo(element, to, duration) {
  // jump to target if duration zero
  if (duration <= 0) {
    raf(function () {
      element.scrollTop = to;
    });
    return;
  }

  var difference = to - element.scrollTop;
  var perTick = difference / duration * 10;
  raf(function () {
    element.scrollTop += perTick;
    if (element.scrollTop === to) return;
    scrollTo(element, to, duration - 10);
  });
};

var Select = {
  name: 'Select',
  mixins: [BaseMixin],
  inheritAttrs: false,
  props: {
    prefixCls: PropTypes.string,
    options: PropTypes.array,
    selectedIndex: PropTypes.number,
    type: PropTypes.string // onSelect: PropTypes.func,
    // onMouseEnter: PropTypes.func,

  },
  data: function data() {
    return {
      active: false
    };
  },
  mounted: function mounted() {
    var _this = this;

    this.$nextTick(function () {
      // jump to selected option
      _this.scrollToSelected(0);
    });
  },
  watch: {
    selectedIndex: function selectedIndex() {
      var _this2 = this;

      this.$nextTick(function () {
        // smooth scroll to selected option
        _this2.scrollToSelected(120);
      });
    }
  },
  methods: {
    onSelect: function onSelect(value) {
      var type = this.type;

      this.__emit('select', type, value);
    },
    onEsc: function onEsc(e) {
      this.__emit('esc', e);
    },
    getOptions: function getOptions() {
      var _this3 = this;

      var options = this.options,
          selectedIndex = this.selectedIndex,
          prefixCls = this.prefixCls;
      return options.map(function (item, index) {
        var _classnames;

        var cls = classnames((_classnames = {}, _defineProperty(_classnames, "".concat(prefixCls, "-select-option-selected"), selectedIndex === index), _defineProperty(_classnames, "".concat(prefixCls, "-select-option-disabled"), item.disabled), _classnames));
        var onClick = item.disabled ? noop : function () {
          _this3.onSelect(item.value);
        };

        var onKeyDown = function onKeyDown(e) {
          if (e.keyCode === 13) onClick();else if (e.keyCode === 27) _this3.onEsc();
        };

        return _vue.createVNode("li", {
          "role": "button",
          "onClick": onClick,
          "class": cls,
          "key": index,
          "disabled": item.disabled,
          "tabindex": "0",
          "onKeydown": onKeyDown
        }, [item.value]);
      });
    },
    handleMouseEnter: function handleMouseEnter(e) {
      this.setState({
        active: true
      });

      this.__emit('mouseenter', e);
    },
    handleMouseLeave: function handleMouseLeave() {
      this.setState({
        active: false
      });
    },
    saveList: function saveList(node) {
      this.list = node;
    },
    scrollToSelected: function scrollToSelected(duration) {
      // move to selected item
      var select = findDOMNode(this);
      var list = this.$refs.list;

      if (!list) {
        return;
      }

      var index = this.selectedIndex;

      if (index < 0) {
        index = 0;
      }

      var topOption = list.children[index];
      var to = topOption.offsetTop;
      scrollTo(select, to, duration);
    }
  },
  render: function render() {
    var _cls;

    var prefixCls = this.prefixCls,
        options = this.options,
        active = this.active;

    if (options.length === 0) {
      return null;
    }

    var cls = (_cls = {}, _defineProperty(_cls, "".concat(prefixCls, "-select"), 1), _defineProperty(_cls, "".concat(prefixCls, "-select-active"), active), _cls);
    return _vue.createVNode("div", {
      "class": cls,
      "onMouseenter": this.handleMouseEnter,
      "onMouseleave": this.handleMouseLeave
    }, [_vue.createVNode("ul", {
      "ref": this.saveList
    }, [this.getOptions()])]);
  }
};
export default Select;