use a message to communicate credits line changes

stepmania/src/ScreenManager.cpp

@@ -99,7 +99,7 @@ void ScreenManager::ThemeChanged()
 	m_SystemLayer = new ScreenSystemLayer;
 	m_SystemLayer->Init();
 	m_SystemLayer->ReloadCreditsText();
-	m_SystemLayer->RefreshCreditsMessages();
+	this->RefreshCreditsMessages();
 }
 
 void ScreenManager::EmptyDeleteQueue()
@@ -533,7 +533,7 @@ void ScreenManager::SystemMessageNoAnimate( const CString &sMessage )
 
 void ScreenManager::RefreshCreditsMessages()
 {
-	m_SystemLayer->RefreshCreditsMessages();
+	MESSAGEMAN->Broadcast( "RefreshCreditText" );
 
 	/* This is called when GAMESTATE->m_bSideIsJoined changes. */
 	CString joined;

stepmania/src/ScreenSystemLayer.cpp

@@ -31,6 +31,12 @@
 //REGISTER_SCREEN_CLASS( ScreenSystemLayer );
 ScreenSystemLayer::ScreenSystemLayer() : Screen("ScreenSystemLayer")
 {
+	MESSAGEMAN->Subscribe( this, "RefreshCreditText" );
+}
+
+ScreenSystemLayer::~ScreenSystemLayer()
+{
+	MESSAGEMAN->Unsubscribe( this, "RefreshCreditText" );
 }
 
 void ScreenSystemLayer::Init()
@@ -210,11 +216,16 @@ CString ScreenSystemLayer::GetCreditsMessage( PlayerNumber pn ) const
 	}
 }
 
-void ScreenSystemLayer::RefreshCreditsMessages()
+void ScreenSystemLayer::HandleMessage( const CString &sMessage )
 {
+	if( sMessage == "RefreshCreditText" )
+	{
 		// update joined
 		FOREACH_PlayerNumber( pn )
 			m_textCredits[pn].SetText( GetCreditsMessage(pn) );
+	}
+	
+	Screen::HandleMessage( sMessage );
 }
 
 void ScreenSystemLayer::AddTimestampLine( const CString &txt, const RageColor &color )

stepmania/src/ScreenSystemLayer.h

@@ -13,11 +13,13 @@ class ScreenSystemLayer : public Screen
 {
 public:
 	ScreenSystemLayer();
+	virtual ~ScreenSystemLayer();
 	virtual void Init();
+	void HandleMessage( const CString &sCommandName );
+
 	void SystemMessage( const CString &sMessage );
 	void SystemMessageNoAnimate( const CString &sMessage );
 	void ReloadCreditsText();
-	void RefreshCreditsMessages();
 	void Update( float fDeltaTime );
 
 private: