class MainMenu : Menu {

    override fun sceneLoaded() {

        val glass = findStage( "glass" )
        val tutorial = glass.findActorByName( "tutorial" )

        if (HiggsAnomaly.instance.instalmentsCompleted() == 0) {
            for ( role in glass.findRolesByClass<InstalmentButton>(InstalmentButton) ) {
                role.actor.die()
            }
    
            for ( role in glass.findRolesByClass<ChapterButton>(ChapterButton) ) {
                role.actor.x = tutorial.x
            }
        } else {
            HiggsAnomaly.instance.highlightInstalment()
        }

        super.sceneLoaded()
    }

    override fun onKey(event : KeyEvent) {
        if (quit.matches(event)) {
            quit()
            return
        }
        super.onKey(event)
    }

}