reka-ui/src/Splitter/utils/pivot.ts

Vue port for Radix UI Primitives.

import { getResizeHandleElementIndex } from './dom'

export function determinePivotIndices(
  groupId: string,
  dragHandleId: string,
  panelGroupElement: ParentNode,
): [indexBefore: number, indexAfter: number] {
  const index = getResizeHandleElementIndex(
    groupId,
    dragHandleId,
    panelGroupElement,
  )

  return index != null ? [index, index + 1] : [-1, -1]
}