Function preventOverflow

app/src/static/js/react-bootstrap.js:4817–4874

* @function * @memberof Modifiers * @argument {Object} data - The data object generated by `update` method * @argument {Object} options - Modifiers configuration and options * @returns {Object} The data object, properly modified

(data, options)

function preventOverflow(data, options) {
  var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper); // If offsetParent is the reference element, we really want to
  // go one step up and use the next offsetParent as reference to
  // avoid to make this modifier completely useless and look like broken

  if (data.instance.reference === boundariesElement) {
    boundariesElement = getOffsetParent(boundariesElement);
  } // NOTE: DOM access here
  // resets the popper's position so that the document size can be calculated excluding
  // the size of the popper element itself


  var transformProp = getSupportedPropertyName('transform');
  var popperStyles = data.instance.popper.style; // assignment to help minification

  var top = popperStyles.top,
      left = popperStyles.left,
      transform = popperStyles[transformProp];
  popperStyles.top = '';
  popperStyles.left = '';
  popperStyles[transformProp] = '';
  var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement, data.positionFixed); // NOTE: DOM access here
  // restores the original style properties after the offsets have been computed

  popperStyles.top = top;
  popperStyles.left = left;
  popperStyles[transformProp] = transform;
  options.boundaries = boundaries;
  var order = options.priority;
  var popper = data.offsets.popper;
  var check = {
    primary: function primary(placement) {
      var value = popper[placement];

      if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
        value = Math.max(popper[placement], boundaries[placement]);
      }

      return defineProperty({}, placement, value);
    },
    secondary: function secondary(placement) {
      var mainSide = placement === 'right' ? 'left' : 'top';
      var value = popper[mainSide];

      if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
        value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
      }

      return defineProperty({}, mainSide, value);
    }
  };
  order.forEach(function (placement) {
    var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
    popper = _extends({}, popper, check[side](placement));
  });
  data.offsets.popper = popper;
  return data;
}