primereact/deferredcontent/deferredcontent.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

this.primereact = this.primereact || {};
this.primereact.deferredcontent = (function (exports, React, api, hooks, componentbase) {
  'use strict';

  function _interopNamespace(e) {
    if (e && e.__esModule) return e;
    var n = Object.create(null);
    if (e) {
      Object.keys(e).forEach(function (k) {
        if (k !== 'default') {
          var d = Object.getOwnPropertyDescriptor(e, k);
          Object.defineProperty(n, k, d.get ? d : {
            enumerable: true,
            get: function () { return e[k]; }
          });
        }
      });
    }
    n["default"] = e;
    return Object.freeze(n);
  }

  var React__namespace = /*#__PURE__*/_interopNamespace(React);

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

  function _iterableToArrayLimit(r, l) {
    var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"];
    if (null != t) {
      var e,
        n,
        i,
        u,
        a = [],
        f = !0,
        o = !1;
      try {
        if (i = (t = t.call(r)).next, 0 === l) {
          if (Object(t) !== t) return;
          f = !1;
        } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0);
      } catch (r) {
        o = !0, n = r;
      } finally {
        try {
          if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return;
        } finally {
          if (o) throw n;
        }
      }
      return a;
    }
  }

  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 = componentbase.ComponentBase.extend({
    defaultProps: {
      __TYPE: 'DeferredContent',
      onload: null,
      children: undefined
    }
  });

  var DeferredContent = /*#__PURE__*/React__namespace.forwardRef(function (inProps, ref) {
    var mergeProps = hooks.useMergeProps();
    var context = React__namespace.useContext(api.PrimeReactContext);
    var props = DeferredContentBase.getProps(inProps, context);
    var _React$useState = React__namespace.useState(false),
      _React$useState2 = _slicedToArray(_React$useState, 2),
      loadedState = _React$useState2[0],
      setLoadedState = _React$useState2[1];
    var elementRef = React__namespace.useRef(null);
    var _useEventListener = hooks.useEventListener({
        target: 'window',
        type: 'scroll',
        listener: function listener() {
          if (shouldLoad()) {
            load();
            unbindScrollListener();
          }
        }
      }),
      _useEventListener2 = _slicedToArray(_useEventListener, 2),
      bindScrollListener = _useEventListener2[0],
      unbindScrollListener = _useEventListener2[1];
    var _DeferredContentBase$ = DeferredContentBase.setMetaData({
        props: props,
        state: {
          loaded: loadedState
        }
      }),
      ptm = _DeferredContentBase$.ptm;
    var shouldLoad = function shouldLoad() {
      if (loadedState) {
        return false;
      }
      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__namespace.useImperativeHandle(ref, function () {
      return {
        props: props,
        getElement: function getElement() {
          return elementRef.current;
        }
      };
    });
    hooks.useMountEffect(function () {
      if (!loadedState) {
        shouldLoad() ? load() : bindScrollListener();
      }
    });
    var rootProps = mergeProps({
      ref: elementRef
    }, DeferredContentBase.getOtherProps(props), ptm('root'));
    return /*#__PURE__*/React__namespace.createElement("div", rootProps, loadedState && props.children);
  });
  DeferredContent.displayName = 'DeferredContent';

  exports.DeferredContent = DeferredContent;

  Object.defineProperty(exports, '__esModule', { value: true });

  return exports;

})({}, React, primereact.api, primereact.hooks, primereact.componentbase);