react-lazily-render-scroll-parent/dist/esnext/utils/getViewportBounds.js

Lazily render react components

var _extends = Object.assign || 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; };

import '../types';
import getElementBounds from './getElementBounds';

export default function (container) {
  if (!container) {
    return undefined;
  }
  if (container === window) {
    return {
      top: window.pageYOffset,
      left: window.pageXOffset,
      bottom: window.pageYOffset + window.innerHeight,
      right: window.pageXOffset + window.innerWidth
    };
  } else {
    var bounds = getElementBounds(container);
    if (bounds) {
      return _extends({}, bounds, {
        bottom: bounds.top + container.offsetHeight,
        right: bounds.left + container.offsetWidth
      });
    } else {
      return undefined;
    }
  }
}