@darius_rosendahl/react-use-hoverintent/dist/index.js

React hook for hoverIntent

"use strict";

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

var _react = require("react");

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _iterableToArrayLimit(arr, i) { if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

function useHoverIntent(options) {
  var ref = options.ref,
      _options$sensitivity = options.sensitivity,
      sensitivity = _options$sensitivity === void 0 ? 6 : _options$sensitivity,
      _options$interval = options.interval,
      interval = _options$interval === void 0 ? 100 : _options$interval,
      _options$timeout = options.timeout,
      timeout = _options$timeout === void 0 ? 0 : _options$timeout;
  var intentRef = (0, _react.useRef)(null);

  var _useState = (0, _react.useState)(false),
      _useState2 = _slicedToArray(_useState, 2),
      isHovering = _useState2[0],
      setIsHovering = _useState2[1];

  var x = 0,
      y = 0,
      pX = 0,
      pY = 0,
      timer = 0;

  var delay = function delay(e) {
    if (timer) {
      clearTimeout(timer);
    }

    return setIsHovering(false);
  };

  var tracker = function tracker(e) {
    x = e.clientX;
    y = e.clientY;
  };

  var compare = function compare(e) {
    if (timer) {
      clearTimeout(timer);
    }

    if (Math.abs(pX - x) + Math.abs(pY - y) < sensitivity) {
      return setIsHovering(true);
    } else {
      pX = x;
      pY = y;
      timer = window.setTimeout(function () {
        return compare(e);
      }, interval);
    }
  };

  var dispatchOver = function dispatchOver(e) {
    if (timer) {
      clearTimeout(timer);
    }

    if (intentRef.current) {
      intentRef.current.removeEventListener('mousemove', tracker, false);
    }

    if (!isHovering) {
      pX = e.clientX;
      pY = e.clientY;

      if (intentRef.current) {
        intentRef.current.addEventListener('mousemove', tracker, false);
      }

      timer = window.setTimeout(function () {
        return compare(e);
      }, interval);
    }
  };

  var dispatchOut = function dispatchOut(e) {
    if (timer) {
      clearTimeout(timer);
    }

    if (intentRef.current) {
      intentRef.current.removeEventListener('mousemove', tracker, false);
    }

    if (isHovering) {
      timer = window.setTimeout(function () {
        return delay(e);
      }, timeout);
    }
  };

  (0, _react.useEffect)(function () {
    var currentRef = intentRef.current;

    if (currentRef) {
      currentRef.addEventListener('mouseover', dispatchOver, false);
      currentRef.addEventListener('mouseout', dispatchOut, false);
    }

    return function () {
      if (currentRef) {
        currentRef.removeEventListener('mouseover', dispatchOver, false);
        currentRef.removeEventListener('mouseout', dispatchOut, false);
      }
    };
  });
  (0, _react.useImperativeHandle)(ref, function () {
    return intentRef.current;
  }, [intentRef]);
  return [isHovering, intentRef];
}