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

一套移动端的React组件库

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 * as ReactDOM from 'react-dom';
import StickyContainer from './StickyContainer';
/**
 * @deprecated please use CSS: position: sticky; top: 0;
 */

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

  var _super = _createSuper(Sticky);

  function Sticky(props) {
    var _this;

    _classCallCheck(this, Sticky);

    _this = _super.call(this, props);
    _this.createPlaceholderRef = _this.createPlaceholderRef.bind(_assertThisInitialized(_this));
    _this.createContentRef = _this.createContentRef.bind(_assertThisInitialized(_this));
    _this.handleContainerEvent = _this.handleContainerEvent.bind(_assertThisInitialized(_this));
    _this.state = {
      isSticky: false,
      wasSticky: false,
      style: {},
      calculatedHeight: 0
    };
    return _this;
  }

  _createClass(Sticky, [{
    key: "componentWillMount",
    value: function componentWillMount() {
      if (!this.context.subscribe) throw new TypeError('Expected Sticky to be mounted within StickyContainer');
      this.context.subscribe(this.handleContainerEvent);
    }
  }, {
    key: "componentDidUpdate",
    value: function componentDidUpdate() {
      this.placeholder.style.paddingBottom = this.props.disableCompensation ? 0 : "".concat(this.state.isSticky ? this.state.calculatedHeight : 0, "px");
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      this.context.unsubscribe(this.handleContainerEvent);
    } // @ts-ignore

  }, {
    key: "handleContainerEvent",
    value: function handleContainerEvent(_ref) {
      var distanceFromTop = _ref.distanceFromTop,
          distanceFromBottom = _ref.distanceFromBottom,
          eventSource = _ref.eventSource;
      var _this$props = this.props,
          relative = _this$props.relative,
          bottomOffset = _this$props.bottomOffset,
          topOffset = _this$props.topOffset,
          disableHardwareAcceleration = _this$props.disableHardwareAcceleration;
      var parent = this.context.getParent();
      var preventingStickyStateChanges = false;

      if (relative) {
        preventingStickyStateChanges = eventSource !== parent;
        distanceFromTop = -(eventSource.scrollTop + eventSource.offsetTop) + this.placeholder.offsetTop;
      }

      var placeholderClientRect = this.placeholder.getBoundingClientRect();
      var contentClientRect = this.content.getBoundingClientRect();
      var calculatedHeight = contentClientRect.height;
      var bottomDifference = distanceFromBottom - bottomOffset - calculatedHeight;
      var wasSticky = this.state.isSticky;
      var isSticky = preventingStickyStateChanges ? wasSticky : distanceFromTop <= -topOffset && distanceFromBottom > -bottomOffset;
      distanceFromBottom = (this.props.relative ? parent.scrollHeight - parent.scrollTop : distanceFromBottom) - calculatedHeight;
      var style = !isSticky ? {} : {
        position: 'fixed',
        top: bottomDifference > 0 ? this.props.relative ? parent.offsetTop - parent.offsetParent.scrollTop : 0 : bottomDifference,
        left: placeholderClientRect.left,
        width: placeholderClientRect.width
      };

      if (!disableHardwareAcceleration) {
        style.transform = 'translateZ(0)';
      }

      this.setState({
        isSticky: isSticky,
        wasSticky: wasSticky,
        distanceFromTop: distanceFromTop,
        distanceFromBottom: distanceFromBottom,
        calculatedHeight: calculatedHeight,
        style: style
      });
    }
  }, {
    key: "createPlaceholderRef",
    value: function createPlaceholderRef(placeholder) {
      this.placeholder = placeholder;
    }
  }, {
    key: "createContentRef",
    value: function createContentRef(content) {
      this.content = ReactDOM.findDOMNode(content);
    }
  }, {
    key: "render",
    value: function render() {
      var element = /*#__PURE__*/React.cloneElement(this.props.children({
        isSticky: this.state.isSticky,
        wasSticky: this.state.wasSticky,
        distanceFromTop: this.state.distanceFromTop,
        distanceFromBottom: this.state.distanceFromBottom,
        calculatedHeight: this.state.calculatedHeight,
        style: this.state.style
      }), {
        ref: this.createContentRef
      });
      return /*#__PURE__*/React.createElement("div", null, /*#__PURE__*/React.createElement("div", {
        ref: this.createPlaceholderRef
      }), element);
    }
  }]);

  return Sticky;
}(React.PureComponent);

Sticky.StickyContainer = StickyContainer;
Sticky.defaultProps = {
  relative: false,
  topOffset: 0,
  bottomOffset: 0,
  disableCompensation: false,
  disableHardwareAcceleration: false
};
Sticky.contextTypes = {
  subscribe: PropTypes.func,
  unsubscribe: PropTypes.func,
  getParent: PropTypes.func
};
export default Sticky;