An Example Screen Saver

Here>s sample code that implements a screen saver that blanks the screen. This is pretty boring, so you>ll probably want to change the Draw() function to do something cute.

   /* Minimal screen saver example. */
   
   #include <add-ons/screen_saver/ScreenSaver.h>
   #include <interface/StringView.h>
   #include <BeBuild.h>
   
   extern "C" {
   _EXPORT
   BScreenSaver *instantiate_screen_saver( BMessage *msg, image_id id );
   }
   
   class MinimalSaver : public BScreenSaver
   {
   public:
       MinimalSaver( BMessage *archive, image_id image );
       virtual ~MinimalSaver( void );
       
       virtual void StartConfig( BView *view );
       virtual status_t StartSaver( BView *view, bool preview );
       virtual void Draw( BView *view, int32 frame );
   };
   
   BScreenSaver *instantiate_screen_saver( BMessage *msg, image_id id )
   {
       return new MinimalSaver( msg, id );
   }
   
   MinimalSaver::MinimalSaver( BMessage *archive, image_id image )
       : BScreenSaver( archive, image )
   {
       /* Nothing else to do here... */
   }
   
   MinimalSaver::~MinimalSaver( void )
   {
       /* Nothing else to do here... */
   }
   
   void MinimalSaver::StartConfig( BView *view )
   {
       view->AddChild( new BStringView( BRect( 10, 10, 200, 35 ),
                                        B_EMPTY_STRING, 
                                        "Minimal Saver" ) );
   }
   
   status_t MinimalSaver::StartSaver( BView *view, bool preview )
   {
       /* We>re so minimal, we don>t have a preview. */
       if( preview ) return B_ERROR;
   
       return B_OK;
   }
   
   void MinimalSaver::Draw( BView *view, int32 frame )
   {
       if( frame == 0 ) {
           /* Fill the screen with black on the first frame: */
           view->SetLowColor( 0, 0, 0 );
           view->FillRect( view->Bounds(), B_SOLID_LOW );
       }
   }