项目在CameraXBasic中的哪里定义类PermissionsFragmentDirections？

Question

以下代码来自https://github.com/android/camera/tree/master/CameraXBasic的CameraXBasic项目

您可以在https://github.com/android/camera/blob/master/CameraXBasic/app/src/main/java/com/android/example/cameraxbasic/fragments/PermissionsFragment.kt上查看完整的代码

我搜索了整个项目，但找不到PermissionsFragmentDirections的声明。你能告诉我吗？

PermissionsFragment.kt

class PermissionsFragment : Fragment() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        if (!hasPermissions()) {
            // Request camera-related permissions
            requestPermissions(PERMISSIONS_REQUIRED, PERMISSIONS_REQUEST_CODE)
        } else {
            // If permissions have already been granted, proceed
            Navigation.findNavController(requireActivity(), R.id.fragment_container).navigate(
                    PermissionsFragmentDirections.actionPermissionsToCamera())
        }
    }

    private fun hasPermissions() = PERMISSIONS_REQUIRED.all {
        ContextCompat.checkSelfPermission(
                requireContext(), it) == PackageManager.PERMISSION_GRANTED
    }

    ...
}