zent/lib/infinite-scroller/InfiniteScroller.js

一套前端设计语言和基于React的实现

'use strict';

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

var _defineProperty2 = require('babel-runtime/helpers/defineProperty');

var _defineProperty3 = _interopRequireDefault(_defineProperty2);

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 _react2 = _interopRequireDefault(_react);

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

var _propTypes2 = _interopRequireDefault(_propTypes);

var _classnames = require('classnames');

var _classnames2 = _interopRequireDefault(_classnames);

var _loading = require('../loading');

var _loading2 = _interopRequireDefault(_loading);

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

var InfiniteScroller = function (_ref) {
  (0, _inherits3['default'])(InfiniteScroller, _ref);

  function InfiniteScroller() {
    var _ref2;

    var _temp, _this, _ret;

    (0, _classCallCheck3['default'])(this, InfiniteScroller);

    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, (_ref2 = InfiniteScroller.__proto__ || Object.getPrototypeOf(InfiniteScroller)).call.apply(_ref2, [this].concat(args))), _this), _this.state = {
      isLoadingShow: false
    }, _this.stopLoading = function () {
      _this.setState({ isLoadingShow: false });
    }, _this.calculateTopPosition = function (el) {
      if (!el) {
        return 0;
      }
      return el.offsetTop + _this.calculateTopPosition(el.offsetParent);
    }, _this.getWindowScrollTop = function () {
      return window.pageYOffset !== undefined ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop;
    }, _this.isScrollAtBottom = function () {
      var _this$props = _this.props,
          offset = _this$props.offset,
          useWindow = _this$props.useWindow;

      var offsetDistance = void 0;

      if (useWindow) {
        var windowScrollTop = _this.getWindowScrollTop();
        offsetDistance = _this.calculateTopPosition(_this.scroller) + _this.scroller.offsetHeight - windowScrollTop - window.innerHeight;
      } else {
        var _this$scroller = _this.scroller,
            scrollHeight = _this$scroller.scrollHeight,
            clientHeight = _this$scroller.clientHeight,
            scrollTop = _this$scroller.scrollTop;

        offsetDistance = scrollHeight - clientHeight - scrollTop;
      }

      return offsetDistance <= offset;
    }, _this.handleScroll = function () {
      var _this$props2 = _this.props,
          hasMore = _this$props2.hasMore,
          loadMore = _this$props2.loadMore;

      if (!hasMore || !_this.isScrollAtBottom()) {
        return;
      }

      _this.setState({
        isLoadingShow: true
      });

      if (loadMore.length > 0) {
        loadMore(_this.stopLoading);
      } else {
        loadMore().then(function () {
          _this.setState({ isLoadingShow: false });
        })['catch'](function () {
          _this.setState({ isLoadingShow: false });
        });
      }
    }, _this.addScrollListener = function () {
      var _this$props3 = _this.props,
          useWindow = _this$props3.useWindow,
          useCapture = _this$props3.useCapture;


      var scrollEl = window;
      if (!useWindow) {
        scrollEl = _this.scroller;
      }

      scrollEl.addEventListener('scroll', _this.handleScroll, useCapture);
      scrollEl.addEventListener('resize', _this.handleScroll, useCapture);
    }, _this.removeScrollListener = function () {
      var _this$props4 = _this.props,
          useWindow = _this$props4.useWindow,
          useCapture = _this$props4.useCapture;


      var scrollEl = window;
      if (!useWindow) {
        scrollEl = _this.scroller;
      }

      scrollEl.removeEventListener('scroll', _this.handleScroll, useCapture);
      scrollEl.removeEventListener('resize', _this.handleScroll, useCapture);
    }, _temp), (0, _possibleConstructorReturn3['default'])(_this, _ret);
  }

  (0, _createClass3['default'])(InfiniteScroller, [{
    key: 'componentDidMount',
    value: function componentDidMount() {
      var _props = this.props,
          loadMore = _props.loadMore,
          initialLoad = _props.initialLoad;


      this.addScrollListener();

      if (initialLoad) {
        loadMore();
      }
    }
  }, {
    key: 'componentWillUnmount',
    value: function componentWillUnmount() {
      this.removeScrollListener();
    }
  }, {
    key: 'render',
    value: function render() {
      var _this2 = this;

      var _props2 = this.props,
          prefix = _props2.prefix,
          className = _props2.className,
          children = _props2.children,
          hasMore = _props2.hasMore,
          loader = _props2.loader,
          useWindow = _props2.useWindow;
      var isLoadingShow = this.state.isLoadingShow;

      var classString = (0, _classnames2['default'])(prefix + '-infinite-scroller', className, (0, _defineProperty3['default'])({}, prefix + '-infinite-scroller-y', !useWindow));
      return _react2['default'].createElement(
        'div',
        { ref: function ref(scroller) {
            return _this2.scroller = scroller;
          }, className: classString },
        children,
        hasMore && isLoadingShow && loader
      );
    }
  }]);
  return InfiniteScroller;
}(_react.PureComponent || _react.Component);

InfiniteScroller.PropTypes = {
  prefix: _propTypes2['default'].string,
  className: _propTypes2['default'].string,
  hasMore: _propTypes2['default'].bool,
  loadMore: _propTypes2['default'].func,
  offset: _propTypes2['default'].num,
  initialLoad: _propTypes2['default'].bool,
  useWindow: _propTypes2['default'].bool,
  useCapture: _propTypes2['default'].bool,
  loader: _propTypes2['default'].node
};
InfiniteScroller.defaultProps = {
  prefix: 'zent',
  hasMore: true,
  offset: 20,
  initialLoad: true,
  useWindow: true,
  useCapture: false,
  loader: _react2['default'].createElement(_loading2['default'], { className: 'zent-infinite-scroller-loading', show: true })
};
exports['default'] = InfiniteScroller;