itk-viewer-bootstrap-ui/src/Main/toggleFullscreen.js

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import fullscreenMethods from './fullscreenMethods'

function toggleFullscreen(context, event, actionMeta) {
  const fullscreenEnabled = context.main.fullscreenEnabled

  // Triggered by operating system events, e.g. pressing Esc while in
  // Fullscreen or F11 when not in fullscreen
  if (fullscreenEnabled === document[fullscreenMethods[3]]) {
    return
  }

  const container = context.rootContainer
  const oldWidth = context.main.rootContainerOldWidth
  const oldHeight = context.main.rootContainerOldHeight

  if (fullscreenEnabled) {
    context.main.rootContainerOldWidth = container.style.width
    context.main.rootContainerOldHeight = container.style.height
    container.style.width = '100vw'
    container.style.height = '100vh'
    context.rootContainer[fullscreenMethods[0]]()
  } else {
    container.style.width = oldWidth
    container.style.height = oldHeight
    document[fullscreenMethods[1]]()
  }
}

export default toggleFullscreen