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Viewing file:     useScrollTrigger.js (2.52 KB)      -rw-r--r--

"use strict";

var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

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

var _extends2 = _interopRequireDefault(require("@babel/runtime/helpers/extends"));

var _objectWithoutProperties2 = _interopRequireDefault(require("@babel/runtime/helpers/objectWithoutProperties"));

var React = _interopRequireWildcard(require("react"));

function defaultTrigger(store, options) {
  var _options$disableHyste = options.disableHysteresis,
      disableHysteresis = _options$disableHyste === void 0 ? false : _options$disableHyste,
      _options$threshold = options.threshold,
      threshold = _options$threshold === void 0 ? 100 : _options$threshold,
      target = options.target;
  var previous = store.current;

  if (target) {
    // Get vertical scroll
    store.current = target.pageYOffset !== undefined ? target.pageYOffset : target.scrollTop;
  }

  if (!disableHysteresis && previous !== undefined) {
    if (store.current < previous) {
      return false;
    }
  }

  return store.current > threshold;
}

var defaultTarget = typeof window !== 'undefined' ? window : null;

function useScrollTrigger() {
  var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
  var _options$getTrigger = options.getTrigger,
      getTrigger = _options$getTrigger === void 0 ? defaultTrigger : _options$getTrigger,
      _options$target = options.target,
      target = _options$target === void 0 ? defaultTarget : _options$target,
      other = (0, _objectWithoutProperties2.default)(options, ["getTrigger", "target"]);
  var store = React.useRef();

  var _React$useState = React.useState(function () {
    return getTrigger(store, other);
  }),
      trigger = _React$useState[0],
      setTrigger = _React$useState[1];

  React.useEffect(function () {
    var handleScroll = function handleScroll() {
      setTrigger(getTrigger(store, (0, _extends2.default)({
        target: target
      }, other)));
    };

    handleScroll(); // Re-evaluate trigger when dependencies change

    target.addEventListener('scroll', handleScroll);
    return function () {
      target.removeEventListener('scroll', handleScroll);
    }; // See Option 3. https://github.com/facebook/react/issues/14476#issuecomment-471199055
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [target, getTrigger, JSON.stringify(other)]);
  return trigger;
}