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

'use client';
import * as React from 'react';
import { PrimeReactContext } from 'primereact/api';
import { useMergeProps, useEventListener, useMountEffect } from 'primereact/hooks';
import { ComponentBase } from 'primereact/componentbase';

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

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

export { DeferredContent };