use-client-rect.ts

/**
  获取元素的大小及其相对于视口的位置，等价于 Element.getBoundingClientRect。
  width 宽度	number
  height 高度	number
  top	顶部与视图窗口左上角的距离	number
  left	左侧与视图窗口左上角的距离	number
  right	右侧与视图窗口左上角的距离	number
  bottom	底部与视图窗口左上角的距离	number
 */

function isWindow(val: unknown): val is Window {
  return val === window
}

export const getRect = (elementRef: Element | Window | undefined) => {
  const element = elementRef

  if (isWindow(element)) {
    const width = element.innerWidth
    const height = element.innerHeight

    return {
      top: 0,
      left: 0,
      right: width,
      bottom: height,
      width,
      height,
    }
  }

  if (element && element.getBoundingClientRect) {
    return element.getBoundingClientRect()
  }

  return {
    top: 0,
    left: 0,
    right: 0,
    bottom: 0,
    width: 0,
    height: 0,
  }
}

export const getRectByTaro = async (element: any) => {
  if (element) {
    const res = await element.getBoundingClientRect()
    return res
  }
  return Promise.resolve({})
}