tntd/lib/scroll-bar/Bar.js

tntd是基于 TNT Design 设计体系的 React UI 组件库，主要用于研发企业级中后台产品。

"use strict";

function _typeof(o) {
  "@babel/helpers - typeof";

  return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
    return typeof o;
  } : function (o) {
    return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
  }, _typeof(o);
}
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _react = _interopRequireWildcard(require("react"));
var _Context = _interopRequireDefault(require("./Context"));
var _Thumb = _interopRequireDefault(require("./Thumb"));
var _util = require("./util");
function _interopRequireDefault(e) {
  return e && e.__esModule ? e : {
    "default": e
  };
}
function _getRequireWildcardCache(e) {
  if ("function" != typeof WeakMap) return null;
  var r = new WeakMap(),
    t = new WeakMap();
  return (_getRequireWildcardCache = function _getRequireWildcardCache(e) {
    return e ? t : r;
  })(e);
}
function _interopRequireWildcard(e, r) {
  if (!r && e && e.__esModule) return e;
  if (null === e || "object" != _typeof(e) && "function" != typeof e) return {
    "default": e
  };
  var t = _getRequireWildcardCache(r);
  if (t && t.has(e)) return t.get(e);
  var n = {
      __proto__: null
    },
    a = Object.defineProperty && Object.getOwnPropertyDescriptor;
  for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) {
    var i = a ? Object.getOwnPropertyDescriptor(e, u) : null;
    i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u];
  }
  return n["default"] = e, t && t.set(e, n), n;
}
function _slicedToArray(r, e) {
  return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest();
}
function _nonIterableRest() {
  throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _unsupportedIterableToArray(r, a) {
  if (r) {
    if ("string" == typeof r) return _arrayLikeToArray(r, a);
    var t = {}.toString.call(r).slice(8, -1);
    return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0;
  }
}
function _arrayLikeToArray(r, a) {
  (null == a || a > r.length) && (a = r.length);
  for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e];
  return n;
}
function _iterableToArrayLimit(r, l) {
  var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
  if (null != t) {
    var e,
      n,
      i,
      u,
      a = [],
      f = !0,
      o = !1;
    try {
      if (i = (t = t.call(r)).next, 0 === l) {
        if (Object(t) !== t) return;
        f = !1;
      } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
    } catch (r) {
      o = !0, n = r;
    } finally {
      try {
        if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return;
      } finally {
        if (o) throw n;
      }
    }
    return a;
  }
}
function _arrayWithHoles(r) {
  if (Array.isArray(r)) return r;
}
var _default = exports["default"] = (0, _react.forwardRef)(function (props, ref) {
  var _useContext = (0, _react.useContext)(_Context["default"]),
    wrapElement = _useContext.wrapElement;
  var _useState = (0, _react.useState)(0),
    _useState2 = _slicedToArray(_useState, 2),
    moveX = _useState2[0],
    setMoveX = _useState2[1];
  var _useState3 = (0, _react.useState)(0),
    _useState4 = _slicedToArray(_useState3, 2),
    moveY = _useState4[0],
    setMoveY = _useState4[1];
  var _useState5 = (0, _react.useState)(0),
    _useState6 = _slicedToArray(_useState5, 2),
    sizeWidth = _useState6[0],
    setSizeWidth = _useState6[1];
  var _useState7 = (0, _react.useState)(0),
    _useState8 = _slicedToArray(_useState7, 2),
    sizeHeight = _useState8[0],
    setSizeHeight = _useState8[1];
  var _useState9 = (0, _react.useState)(1),
    _useState10 = _slicedToArray(_useState9, 2),
    ratioX = _useState10[0],
    setRatioX = _useState10[1];
  var _useState11 = (0, _react.useState)(1),
    _useState12 = _slicedToArray(_useState11, 2),
    ratioY = _useState12[0],
    setRatioY = _useState12[1];
  (0, _react.useImperativeHandle)(ref, function () {
    return {
      update: update,
      handleScroll: handleScroll
    };
  });
  function handleScroll() {
    var wrap = wrapElement.current;
    if (!wrap) return;
    var offsetHeight = wrap.offsetHeight - _util.GAP;
    var offsetWidth = wrap.offsetWidth - _util.GAP;
    setMoveY(wrap.scrollTop * 100 / offsetHeight * ratioY);
    setMoveX(wrap.scrollLeft * 100 / offsetWidth * ratioX);
  }
  function update() {
    var wrap = wrapElement.current;
    if (!wrap) return;
    // 滚动窗口的高度
    var offsetHeight = wrap.offsetHeight - _util.GAP;
    var offsetWidth = wrap.offsetWidth - _util.GAP;
    // 滚动条的逻辑高度
    var originalHeight = Math.pow(offsetHeight, 2) / wrap.scrollHeight;
    var originalWidth = Math.pow(offsetWidth, 2) / wrap.scrollWidth;
    // 滚动条的实际高度，因为如果内容太长会导致滚动条非常短，可能难以点击拖拽，所以设置了最小高度
    var height = Math.max(originalHeight, props.minSize);
    var width = Math.max(originalWidth, props.minSize);
    setRatioY(originalHeight / (offsetHeight - originalHeight) / (height / (offsetHeight - height)));
    setRatioX(originalWidth / (offsetWidth - originalWidth) / (width / (offsetWidth - width)));
    setSizeHeight(height + _util.GAP < offsetHeight ? height : 0);
    setSizeWidth(width + _util.GAP < offsetWidth ? width : 0);
  }
  return _react["default"].createElement(_react["default"].Fragment, null, _react["default"].createElement(_Thumb["default"], {
    always: props.always,
    move: moveX,
    size: sizeWidth,
    ratio: ratioX
  }), _react["default"].createElement(_Thumb["default"], {
    always: props.always,
    move: moveY,
    size: sizeHeight,
    ratio: ratioY,
    vertical: true
  }));
});