Edit File: shift.js
/** * @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 shift(data) { const placement = data.placement; const basePlacement = placement.split('-')[0]; const shiftvariation = placement.split('-')[1]; // if shift shiftvariation is specified, run the modifier if (shiftvariation) { const { reference, popper } = data.offsets; const isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1; const side = isVertical ? 'left' : 'top'; const measurement = isVertical ? 'width' : 'height'; const shiftOffsets = { start: { [side]: reference[side] }, end: { [side]: reference[side] + reference[measurement] - popper[measurement], }, }; data.offsets.popper = { ...popper, ...shiftOffsets[shiftvariation] }; } return data; }
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