zarm/lib/slider/utils/getClosestPoint.js

基于 React 的移动端UI库

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getClosestPoint;

var _toConsumableArray2 = _interopRequireDefault(require("@babel/runtime/helpers/toConsumableArray"));

function getClosestPoint(val, _ref) {
  var _ref$marks = _ref.marks,
      marks = _ref$marks === void 0 ? {} : _ref$marks,
      _ref$step = _ref.step,
      step = _ref$step === void 0 ? 1 : _ref$step,
      _ref$min = _ref.min,
      min = _ref$min === void 0 ? 0 : _ref$min,
      _ref$max = _ref.max,
      max = _ref$max === void 0 ? 10 : _ref$max;

  if (max < min) {
    throw new Error("\"max\" should be greater than \"min\". Got \"min\" = ".concat(min, ", \"max\" = ").concat(max));
  }

  var points = Object.keys(marks || {}).map(parseFloat);

  if (step !== null) {
    var maxSteps = Math.floor((max - min) / step);
    var steps = Math.min((val - min) / step, maxSteps);
    var closestStep = Math.round(steps) * step + min;
    points.push(closestStep);
  }

  var diffs = points.map(function (point) {
    return Math.abs(val - point);
  });
  return points[diffs.indexOf(Math.min.apply(Math, (0, _toConsumableArray2.default)(diffs)))];
}