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Edit File: applyStyle.js

import setStyles from '../utils/setStyles';
import setAttributes from '../utils/setAttributes';
import getReferenceOffsets from '../utils/getReferenceOffsets';
import computeAutoPlacement from '../utils/computeAutoPlacement';

/**
 * @function
 * @memberof Modifiers
 * @argument {Object} data - The data object generated by `update` method
 * @argument {Object} data.styles - List of style properties - values to apply to popper element
 * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
 * @argument {Object} options - Modifiers configuration and options
 * @returns {Object} The same data object
 */
export default function applyStyle(data) {
  // any property present in `data.styles` will be applied to the popper,
  // in this way we can make the 3rd party modifiers add custom styles to it
  // Be aware, modifiers could override the properties defined in the previous
  // lines of this modifier!
  setStyles(data.instance.popper, data.styles);

// any property present in `data.attributes` will be applied to the popper,
  // they will be set as HTML attributes of the element
  setAttributes(data.instance.popper, data.attributes);

// if arrowElement is defined and arrowStyles has some properties
  if (data.arrowElement && Object.keys(data.arrowStyles).length) {
    setStyles(data.arrowElement, data.arrowStyles);
  }

return data;
}

/**
 * Set the x-placement attribute before everything else because it could be used
 * to add margins to the popper margins needs to be calculated to get the
 * correct popper offsets.
 * @method
 * @memberof Popper.modifiers
 * @param {HTMLElement} reference - The reference element used to position the popper
 * @param {HTMLElement} popper - The HTML element used as popper
 * @param {Object} options - Popper.js options
 */
export function applyStyleOnLoad(
  reference,
  popper,
  options,
  modifierOptions,
  state
) {
  // compute reference element offsets
  const referenceOffsets = getReferenceOffsets(state, popper, reference, options.positionFixed);

// compute auto placement, store placement inside the data object,
  // modifiers will be able to edit `placement` if needed
  // and refer to originalPlacement to know the original value
  const placement = computeAutoPlacement(
    options.placement,
    referenceOffsets,
    popper,
    reference,
    options.modifiers.flip.boundariesElement,
    options.modifiers.flip.padding
  );

popper.setAttribute('x-placement', placement);

// Apply `position` to popper before anything else because
  // without the position applied we can't guarantee correct computations
  setStyles(popper, { position: options.positionFixed ? 'fixed' : 'absolute' });

return options;
}

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