ScreenWithCallbacks.kt

class SelectPictureScreen(
  private val listener: Events
) : Screen<SelectPictureContainer> {
  
  override fun attach(c: SelectPictureContainer) {
    c.setOnPictureClickListener { listener.onPictureSelected(it.id) } 
  }
 
  interface Events {
    fun onPictureSelected(id: Long) 
  }
}