primereact/deferredcontent/deferredcontent.esm.js

PrimeReact is an open source UI library for React featuring a rich set of 90+ components, a theme designer, various theme alternatives such as Material, Bootstrap, Tailwind, premium templates and professional support. In addition, it integrates with Prime

import * as React from 'react';
import { useEventListener, useMountEffect } from 'primereact/hooks';
import { ObjectUtils } from 'primereact/utils';

function _extends() {
  _extends = Object.assign ? Object.assign.bind() : function (target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];
      for (var key in source) {
        if (Object.prototype.hasOwnProperty.call(source, key)) {
          target[key] = source[key];
        }
      }
    }
    return target;
  };
  return _extends.apply(this, arguments);
}

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

function _iterableToArrayLimit(arr, i) {
  var _i = null == arr ? null : "undefined" != typeof Symbol && arr[Symbol.iterator] || arr["@@iterator"];
  if (null != _i) {
    var _s,
      _e,
      _x,
      _r,
      _arr = [],
      _n = !0,
      _d = !1;
    try {
      if (_x = (_i = _i.call(arr)).next, 0 === i) {
        if (Object(_i) !== _i) return;
        _n = !1;
      } else for (; !(_n = (_s = _x.call(_i)).done) && (_arr.push(_s.value), _arr.length !== i); _n = !0);
    } catch (err) {
      _d = !0, _e = err;
    } finally {
      try {
        if (!_n && null != _i["return"] && (_r = _i["return"](), Object(_r) !== _r)) return;
      } finally {
        if (_d) throw _e;
      }
    }
    return _arr;
  }
}

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

var DeferredContentBase = {
  defaultProps: {
    __TYPE: 'DeferredContent',
    onload: null,
    children: undefined
  },
  getProps: function getProps(props) {
    return ObjectUtils.getMergedProps(props, DeferredContentBase.defaultProps);
  },
  getOtherProps: function getOtherProps(props) {
    return ObjectUtils.getDiffProps(props, DeferredContentBase.defaultProps);
  }
};

var DeferredContent = /*#__PURE__*/React.forwardRef(function (inProps, ref) {
  var props = DeferredContentBase.getProps(inProps);
  var _React$useState = React.useState(false),
    _React$useState2 = _slicedToArray(_React$useState, 2),
    loadedState = _React$useState2[0],
    setLoadedState = _React$useState2[1];
  var elementRef = React.useRef(null);
  var _useEventListener = useEventListener({
      target: 'window',
      type: 'scroll',
      listener: function listener() {
        if (shouldLoad()) {
          load();
          unbindScrollListener();
        }
      }
    }),
    _useEventListener2 = _slicedToArray(_useEventListener, 2),
    bindScrollListener = _useEventListener2[0],
    unbindScrollListener = _useEventListener2[1];
  var shouldLoad = function shouldLoad() {
    if (loadedState) {
      return false;
    } else {
      var rect = elementRef.current.getBoundingClientRect();
      var winHeight = document.documentElement.clientHeight;
      return winHeight >= rect.top;
    }
  };
  var load = function load(event) {
    setLoadedState(true);
    props.onLoad && props.onLoad(event);
  };
  React.useImperativeHandle(ref, function () {
    return {
      props: props,
      getElement: function getElement() {
        return elementRef.current;
      }
    };
  });
  useMountEffect(function () {
    if (!loadedState) {
      shouldLoad() ? load() : bindScrollListener();
    }
  });
  var otherProps = DeferredContentBase.getOtherProps(props);
  return /*#__PURE__*/React.createElement("div", _extends({
    ref: elementRef
  }, otherProps), loadedState && props.children);
});
DeferredContent.displayName = 'DeferredContent';

export { DeferredContent };