material-ui/internal/AutoLockScrolling.js

React Components that Implement Google's Material Design.

'use strict';

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

var _getPrototypeOf = require('babel-runtime/core-js/object/get-prototype-of');

var _getPrototypeOf2 = _interopRequireDefault(_getPrototypeOf);

var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _createClass2 = require('babel-runtime/helpers/createClass');

var _createClass3 = _interopRequireDefault(_createClass2);

var _possibleConstructorReturn2 = require('babel-runtime/helpers/possibleConstructorReturn');

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _inherits2 = require('babel-runtime/helpers/inherits');

var _inherits3 = _interopRequireDefault(_inherits2);

var _react = require('react');

var _propTypes = require('prop-types');

var _propTypes2 = _interopRequireDefault(_propTypes);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var originalBodyOverflow = null;
var lockingCounter = 0;

var AutoLockScrolling = function (_Component) {
  (0, _inherits3.default)(AutoLockScrolling, _Component);

  function AutoLockScrolling() {
    var _ref;

    var _temp, _this, _ret;

    (0, _classCallCheck3.default)(this, AutoLockScrolling);

    for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    return _ret = (_temp = (_this = (0, _possibleConstructorReturn3.default)(this, (_ref = AutoLockScrolling.__proto__ || (0, _getPrototypeOf2.default)(AutoLockScrolling)).call.apply(_ref, [this].concat(args))), _this), _this.locked = false, _temp), (0, _possibleConstructorReturn3.default)(_this, _ret);
  }

  (0, _createClass3.default)(AutoLockScrolling, [{
    key: 'componentDidMount',
    value: function componentDidMount() {
      if (this.props.lock === true) {
        this.preventScrolling();
      }
    }
  }, {
    key: 'componentWillReceiveProps',
    value: function componentWillReceiveProps(nextProps) {
      if (this.props.lock !== nextProps.lock) {
        if (nextProps.lock) {
          this.preventScrolling();
        } else {
          this.allowScrolling();
        }
      }
    }
  }, {
    key: 'componentWillUnmount',
    value: function componentWillUnmount() {
      this.allowScrolling();
    }

    // force to only lock/unlock once

  }, {
    key: 'preventScrolling',
    value: function preventScrolling() {
      if (this.locked === true) {
        return;
      }

      lockingCounter = lockingCounter + 1;
      this.locked = true;

      // only lock the first time the component is mounted.
      if (lockingCounter === 1) {
        var body = document.getElementsByTagName('body')[0];
        originalBodyOverflow = body.style.overflow;
        body.style.overflow = 'hidden';
      }
    }
  }, {
    key: 'allowScrolling',
    value: function allowScrolling() {
      if (this.locked === true) {
        lockingCounter = lockingCounter - 1;
        this.locked = false;
      }

      if (lockingCounter === 0 && originalBodyOverflow !== null) {
        var body = document.getElementsByTagName('body')[0];
        body.style.overflow = originalBodyOverflow || '';
        originalBodyOverflow = null;
      }
    }
  }, {
    key: 'render',
    value: function render() {
      return null;
    }
  }]);
  return AutoLockScrolling;
}(_react.Component);

AutoLockScrolling.propTypes = process.env.NODE_ENV !== "production" ? {
  lock: _propTypes2.default.bool.isRequired
} : {};
exports.default = AutoLockScrolling;