smooth-scroll-to/build/cjs/src/index.js

Smooth scroll to library

"use strict";

var _interopRequireDefault = require("reshow-runtime/helpers/interopRequireDefault");
exports.__esModule = true;
exports["default"] = void 0;
var _getScrollInfo = require("get-scroll-info");
var _callFunc = _interopRequireDefault(require("call-func"));
var _easingLib = require("easing-lib");
var _reshowConstant = require("reshow-constant");
// @ts-check

var isRunning = (0, _reshowConstant.NEW_OBJ)();

/**
 *  !!Important!! any logic change need take care isRunning
 *
 *  @param {number} to
 *  @param {number} [duration]
 *  @param {HTMLElement} [el]
 *  @param {function} [callback]
 *  @param {string} [scrollKey]
 *  @returns {function} cancel handler
 */
var smoothScrollTo = function smoothScrollTo(to, duration, el, callback, scrollKey) {
  if (duration === void 0) {
    duration = 500;
  }
  if (scrollKey === void 0) {
    scrollKey = "scrollTop";
  }
  var scrollNode = (0, _getScrollInfo.getScrollNode)(el);
  var cb = function cb() {
    if (isRunning[scrollKey]) {
      (0, _callFunc["default"])(callback, [{
        scrollNode: scrollNode,
        from: from,
        to: to,
        go: go
      }]);
      isRunning[scrollKey] = false;
    }
  };
  var cancel = function cancel() {
    clearTimeout(isRunning[scrollKey]);
    isRunning[scrollKey] = false;
  };
  if (isRunning[scrollKey]) {
    clearTimeout(isRunning[scrollKey]);
    isRunning[scrollKey] = setTimeout(function () {
      scrollNode[scrollKey] = to;
      cb();
    });
    return cancel;
  }
  var from = scrollNode[scrollKey];
  var go = to - from;
  if (!go) {
    return function () {};
  }
  (0, _easingLib.aniTimer)({
    isContinue: function isContinue( /**@type number*/elapsedTime) {
      if (isRunning[scrollKey]) {
        var progress = (0, _easingLib.easeInOutCubic)(elapsedTime, from, go, duration);
        scrollNode[scrollKey] = progress;
        return true;
      }
    },
    cancel: function cancel() {
      return cb();
    },
    done: function done() {
      return cb();
    }
  }, duration);
  isRunning[scrollKey] = true;
  return cancel;
};
var _default = smoothScrollTo;
exports["default"] = _default;
module.exports = exports.default;