jiaojiu/node_modules/vant/es/rate/index.js

// Utils
import { createNamespace, addUnit } from '../utils';
import { preventDefault } from '../utils/dom/event'; // Mixins

import { TouchMixin } from '../mixins/touch';
import { FieldMixin } from '../mixins/field'; // Components

import Icon from '../icon';

var _createNamespace = createNamespace('rate'),
    createComponent = _createNamespace[0],
    bem = _createNamespace[1];

function getRateStatus(value, index, allowHalf) {
  if (value >= index) {
    return 'full';
  }

  if (value + 0.5 >= index && allowHalf) {
    return 'half';
  }

  return 'void';
}

export default createComponent({
  mixins: [TouchMixin, FieldMixin],
  props: {
    size: [Number, String],
    color: String,
    gutter: [Number, String],
    readonly: Boolean,
    disabled: Boolean,
    allowHalf: Boolean,
    voidColor: String,
    iconPrefix: String,
    disabledColor: String,
    value: {
      type: Number,
      default: 0
    },
    icon: {
      type: String,
      default: 'star'
    },
    voidIcon: {
      type: String,
      default: 'star-o'
    },
    count: {
      type: [Number, String],
      default: 5
    },
    touchable: {
      type: Boolean,
      default: true
    }
  },
  computed: {
    list: function list() {
      var list = [];

      for (var i = 1; i <= this.count; i++) {
        list.push(getRateStatus(this.value, i, this.allowHalf));
      }

      return list;
    },
    sizeWithUnit: function sizeWithUnit() {
      return addUnit(this.size);
    },
    gutterWithUnit: function gutterWithUnit() {
      return addUnit(this.gutter);
    }
  },
  mounted: function mounted() {
    this.bindTouchEvent(this.$el);
  },
  methods: {
    select: function select(index) {
      if (!this.disabled && !this.readonly && index !== this.value) {
        this.$emit('input', index);
        this.$emit('change', index);
      }
    },
    onTouchStart: function onTouchStart(event) {
      var _this = this;

      if (this.readonly || this.disabled || !this.touchable) {
        return;
      }

      this.touchStart(event);
      var rects = this.$refs.items.map(function (item) {
        return item.getBoundingClientRect();
      });
      var ranges = [];
      rects.forEach(function (rect, index) {
        if (_this.allowHalf) {
          ranges.push({
            score: index + 0.5,
            left: rect.left
          }, {
            score: index + 1,
            left: rect.left + rect.width / 2
          });
        } else {
          ranges.push({
            score: index + 1,
            left: rect.left
          });
        }
      });
      this.ranges = ranges;
    },
    onTouchMove: function onTouchMove(event) {
      if (this.readonly || this.disabled || !this.touchable) {
        return;
      }

      this.touchMove(event);

      if (this.direction === 'horizontal') {
        preventDefault(event);
        var clientX = event.touches[0].clientX;
        this.select(this.getScoreByPosition(clientX));
      }
    },
    getScoreByPosition: function getScoreByPosition(x) {
      for (var i = this.ranges.length - 1; i > 0; i--) {
        if (x > this.ranges[i].left) {
          return this.ranges[i].score;
        }
      }

      return this.allowHalf ? 0.5 : 1;
    },
    genStar: function genStar(status, index) {
      var _this2 = this;

      var h = this.$createElement;
      var icon = this.icon,
          color = this.color,
          count = this.count,
          voidIcon = this.voidIcon,
          disabled = this.disabled,
          voidColor = this.voidColor,
          disabledColor = this.disabledColor;
      var score = index + 1;
      var isFull = status === 'full';
      var isVoid = status === 'void';
      var style;

      if (this.gutterWithUnit && score !== +count) {
        style = {
          paddingRight: this.gutterWithUnit
        };
      }

      return h("div", {
        "ref": "items",
        "refInFor": true,
        "key": index,
        "attrs": {
          "role": "radio",
          "tabindex": "0",
          "aria-setsize": count,
          "aria-posinset": score,
          "aria-checked": String(!isVoid)
        },
        "style": style,
        "class": bem('item')
      }, [h(Icon, {
        "attrs": {
          "size": this.sizeWithUnit,
          "name": isFull ? icon : voidIcon,
          "color": disabled ? disabledColor : isFull ? color : voidColor,
          "classPrefix": this.iconPrefix,
          "data-score": score
        },
        "class": bem('icon', {
          disabled: disabled,
          full: isFull
        }),
        "on": {
          "click": function click() {
            _this2.select(score);
          }
        }
      }), this.allowHalf && h(Icon, {
        "attrs": {
          "size": this.sizeWithUnit,
          "name": isVoid ? voidIcon : icon,
          "color": disabled ? disabledColor : isVoid ? voidColor : color,
          "classPrefix": this.iconPrefix,
          "data-score": score - 0.5
        },
        "class": bem('icon', ['half', {
          disabled: disabled,
          full: !isVoid
        }]),
        "on": {
          "click": function click() {
            _this2.select(score - 0.5);
          }
        }
      })]);
    }
  },
  render: function render() {
    var _this3 = this;

    var h = arguments[0];
    return h("div", {
      "class": bem({
        readonly: this.readonly,
        disabled: this.disabled
      }),
      "attrs": {
        "tabindex": "0",
        "role": "radiogroup"
      }
    }, [this.list.map(function (status, index) {
      return _this3.genStar(status, index);
    })]);
  }
});