itk-viewer-material-ui/src/Main/FullscreenButton.jsx

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import React, { useEffect, useRef } from 'react'
import { useActor } from '@xstate/react'
import { Icon, ToggleButton, Tooltip } from '@mui/material'
import { fullscreenIconDataUri } from 'itk-viewer-icons'
import '../style.css'

function FullscreenButton(props) {
  const { service } = props
  const fullscreenButton = useRef(null)
  const [state, send] = useActor(service)

  useEffect(() => {
    state.context.main.fullscreenButton = fullscreenButton.current
  }, [])

  return (
    <Tooltip
      ref={fullscreenButton}
      title="Fullscreen [f]"
      PopperProps={{
        anchorEl: fullscreenButton.current,
        disablePortal: true,
        keepMounted: true
      }}
    >
      <ToggleButton
        size="small"
        className="toggleButton"
        value="fullscreenEnabled"
        selected={state.context.main.fullscreenEnabled}
        onChange={() => {
          send('TOGGLE_FULLSCREEN')
        }}
      >
        <Icon>
          <img src={fullscreenIconDataUri} />
        </Icon>
      </ToggleButton>
    </Tooltip>
  )
}

export default FullscreenButton