@jdcfe/yep-react/es/sticky/StickyContainer.js

一套移动端的React组件库

import _extends from "@babel/runtime/helpers/extends";
import _classCallCheck from "@babel/runtime/helpers/classCallCheck";
import _createClass from "@babel/runtime/helpers/createClass";
import _assertThisInitialized from "@babel/runtime/helpers/assertThisInitialized";
import _inherits from "@babel/runtime/helpers/inherits";
import _possibleConstructorReturn from "@babel/runtime/helpers/possibleConstructorReturn";
import _getPrototypeOf from "@babel/runtime/helpers/getPrototypeOf";

function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

import * as React from 'react';
import * as PropTypes from 'prop-types';
import raf from 'raf';

var StickyContainer = /*#__PURE__*/function (_React$PureComponent) {
  _inherits(StickyContainer, _React$PureComponent);

  var _super = _createSuper(StickyContainer);

  function StickyContainer(props) {
    var _this;

    _classCallCheck(this, StickyContainer);

    _this = _super.call(this, props);
    _this.subscribers = [];
    _this.events = ['resize', 'scroll', 'touchstart', 'touchmove', 'touchend', 'pageshow', 'load'];
    _this.createRef = _this.createRef.bind(_assertThisInitialized(_this));
    _this.getParent = _this.getParent.bind(_assertThisInitialized(_this));
    _this.subscribe = _this.subscribe.bind(_assertThisInitialized(_this));
    _this.unsubscribe = _this.unsubscribe.bind(_assertThisInitialized(_this));
    _this.notifySubscribers = _this.notifySubscribers.bind(_assertThisInitialized(_this));
    return _this;
  }

  _createClass(StickyContainer, [{
    key: "getChildContext",
    value: function getChildContext() {
      return {
        subscribe: this.subscribe,
        unsubscribe: this.unsubscribe,
        getParent: this.getParent
      };
    }
  }, {
    key: "subscribe",
    value: function subscribe(handler) {
      this.subscribers = this.subscribers.concat(handler);
    }
  }, {
    key: "unsubscribe",
    value: function unsubscribe(handler) {
      this.subscribers = this.subscribers.filter(function (current) {
        return current !== handler;
      });
    }
  }, {
    key: "notifySubscribers",
    value: function notifySubscribers(evt) {
      var _this2 = this;

      if (!this.framePending) {
        var currentTarget = evt.currentTarget;
        raf(function () {
          _this2.framePending = false;

          var _this2$node$getBoundi = _this2.node.getBoundingClientRect(),
              top = _this2$node$getBoundi.top,
              bottom = _this2$node$getBoundi.bottom;

          _this2.subscribers.forEach(function (handler) {
            return handler({
              distanceFromTop: top,
              distanceFromBottom: bottom,
              eventSource: currentTarget === window ? document.body : _this2.node
            });
          });
        });
        this.framePending = true;
      }
    }
  }, {
    key: "createRef",
    value: function createRef(node) {
      this.node = node;
    }
  }, {
    key: "getParent",
    value: function getParent() {
      return this.node;
    }
  }, {
    key: "componentDidMount",
    value: function componentDidMount() {
      var _this3 = this;

      this.events.forEach(function (event) {
        return window.addEventListener(event, _this3.notifySubscribers);
      });
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      var _this4 = this;

      this.events.forEach(function (event) {
        return window.removeEventListener(event, _this4.notifySubscribers);
      });
    }
  }, {
    key: "render",
    value: function render() {
      return /*#__PURE__*/React.createElement("div", _extends({}, this.props, {
        ref: this.createRef,
        onScroll: this.notifySubscribers,
        onTouchStart: this.notifySubscribers,
        onTouchMove: this.notifySubscribers,
        onTouchEnd: this.notifySubscribers
      }));
    }
  }]);

  return StickyContainer;
}(React.PureComponent);

export { StickyContainer as default };
StickyContainer.defaultProps = {};
StickyContainer.childContextTypes = {
  subscribe: PropTypes.func,
  unsubscribe: PropTypes.func,
  getParent: PropTypes.func
};