react/components/tooltip/placement.ts

import { Placement } from '../utils/prop-types'

interface ParentDomRect {
  top: number
  left: number
  right: number
  bottom: number
  width: number
  height: number
}

export interface TooltipPosition {
  top: string
  left: string
  transform: string
}

export const defaultTooltipPosition = {
  top: '-1000px',
  left: '-1000px',
  transform: 'none',
}

export interface TooltipIconPosition {
  top: string
  left: string
  right: string
  bottom: string
  transform: string
}

export const getPosition = (
  placement: Placement,
  rect: ParentDomRect,
  offset: number,
): TooltipPosition => {
  const positions: { [key in Placement]: TooltipPosition } = {
    top: {
      top: `${rect.top - offset}px`,
      left: `${rect.left + rect.width / 2}px`,
      transform: 'translate(-50%, -100%)',
    },
    topStart: {
      top: `${rect.top - offset}px`,
      left: `${rect.left}px`,
      transform: 'translate(0, -100%)',
    },
    topEnd: {
      top: `${rect.top - offset}px`,
      left: `${rect.left + rect.width}px`,
      transform: 'translate(-100%, -100%)',
    },
    bottom: {
      top: `${rect.bottom + offset}px`,
      left: `${rect.left + rect.width / 2}px`,
      transform: 'translate(-50%, 0)',
    },
    bottomStart: {
      top: `${rect.bottom + offset}px`,
      left: `${rect.left}px`,
      transform: 'translate(0, 0)',
    },
    bottomEnd: {
      top: `${rect.bottom + offset}px`,
      left: `${rect.left + rect.width}px`,
      transform: 'translate(-100%, 0)',
    },
    left: {
      top: `${rect.top + rect.height / 2}px`,
      left: `${rect.left - offset}px`,
      transform: 'translate(-100%, -50%)',
    },
    leftStart: {
      top: `${rect.top}px`,
      left: `${rect.left - offset}px`,
      transform: 'translate(-100%, 0)',
    },
    leftEnd: {
      top: `${rect.top + rect.height}px`,
      left: `${rect.left - offset}px`,
      transform: 'translate(-100%, -100%)',
    },
    right: {
      top: `${rect.top + rect.height / 2}px`,
      left: `${rect.right + offset}px`,
      transform: 'translate(0, -50%)',
    },
    rightStart: {
      top: `${rect.top}px`,
      left: `${rect.right + offset}px`,
      transform: 'translate(0, 0)',
    },
    rightEnd: {
      top: `${rect.top + rect.height}px`,
      left: `${rect.right + offset}px`,
      transform: 'translate(0, -100%)',
    },
  }
  return positions[placement] || positions.top as TooltipPosition
}

export const getIconPosition = (
  placement: Placement,
  offset: number,
): TooltipIconPosition => {
  const positions: { [key in Placement]?: TooltipIconPosition } = {
    top: {
      top: 'auto', right: 'auto',
      left: '50%', bottom: `${offset}px`,
      transform: 'translate(-50%, 100%) rotate(-90deg)'
    },
    topStart: {
      top: 'auto', right: 'auto',
      left: '5%', bottom: `${offset}px`,
      transform: 'translate(0, 100%) rotate(-90deg)'
    },
    topEnd: {
      top: 'auto', right: '5%',
      left: 'auto', bottom: `${offset}px`,
      transform: 'translate(0, 100%) rotate(-90deg)'
    },
    bottom: {
      top: `${offset}px`, right: 'auto',
      left: '50%', bottom: 'auto',
      transform: 'translate(-50%, -100%) rotate(90deg)'
    },
    bottomStart: {
      top: `${offset}px`, right: 'auto',
      left: '5%', bottom: 'auto',
      transform: 'translate(0, -100%) rotate(90deg)'
    },
    bottomEnd: {
      top: `${offset}px`, right: '5%',
      left: 'auto', bottom: 'auto',
      transform: 'translate(0, -100%) rotate(90deg)'
    },
    left: {
      top: '50%', right: '0',
      left: 'auto', bottom: 'auto',
      transform: 'translate(100%, -50%) rotate(180deg)'
    },
    leftStart: {
      top: '10%', right: '0',
      left: 'auto', bottom: 'auto',
      transform: 'translate(100%, 0) rotate(180deg)'
    },
    leftEnd: {
      top: 'auto', right: '0',
      left: 'auto', bottom: '10%',
      transform: 'translate(100%, 0) rotate(180deg)'
    },
    right: {
      top: '50%', right: 'auto',
      left: '0', bottom: 'auto',
      transform: 'translate(-100%, -50%) rotate(0deg)'
    },
    rightStart: {
      top: '10%', right: 'auto',
      left: '0', bottom: 'auto',
      transform: 'translate(-100%, 0) rotate(0deg)'
    },
    rightEnd: {
      top: 'auto', right: 'auto',
      left: '0', bottom: '10%',
      transform: 'translate(-100%, 0) rotate(0deg)'
    },
  }
  
  return positions[placement] || positions.top as TooltipIconPosition
}