Another Screensaver with WPF

using System.Diagnostics;

namespace RZWScreenSaver.SlidePages{
    static class SlidePageFactory{
        static public ICreator Create(SaverMode mode){
            ICreator creator;
            switch (mode){
            case SaverMode.SlideShow:
                creator = new SimpleSlideCreator();
                break;
            case SaverMode.PhotoCollage:
                creator = new PhotoCollageCreator();
                break;
            case SaverMode.Mixed:
                creator = new MixedCreator();
                break;
            default:
                creator = new MixedCreator();
                Trace.WriteLine("SlidePageFactory: " + mode + " is not handled!!");
                break;
            }
            return creator;
        }
        public interface ICreator{
            ISlidePage Create(DisplayMode displayMode);
        }
        class SimpleSlideCreator : ICreator{
            public ISlidePage Create(DisplayMode displayMode){
                return new SimpleSlide{DisplayMode = displayMode};
            }
        }
        class PhotoCollageCreator : ICreator{
            public ISlidePage Create(DisplayMode displayMode){
                return new PhotoCollagePage{DisplayMode = displayMode};
            }
        }
        class MixedCreator : ICreator{
            public ISlidePage Create(DisplayMode displayMode){
                if (++count % 2 == 0)
                    return new SimpleSlide{DisplayMode = displayMode};
                else
                    return new PhotoCollagePage{DisplayMode = displayMode};
            }
            int count;
        }
    }
}