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/**
* @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
*/
export default function keepTogether(data) {
const { popper, reference } = data.offsets;
const placement = data.placement.split('-')[0];
const floor = Math.floor;
const isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
const side = isVertical ? 'right' : 'bottom';
const opSide = isVertical ? 'left' : 'top';
const measurement = isVertical ? 'width' : 'height';
if (popper[side] < floor(reference[opSide])) {
data.offsets.popper[opSide] =
floor(reference[opSide]) - popper[measurement];
}
if (popper[opSide] > floor(reference[side])) {
data.offsets.popper[opSide] = floor(reference[side]);
}
return data;
}