evilsatellites/EvilSatellites/ScreenManager.cs

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using SynthySound;
using Synthizer;
using Microsoft.Xna.Framework.Audio;
using EvilSatellites.Screens;


namespace EvilSatellites
{
    public class ScreenManager : DrawableGameComponent
    {
        private List<IScreen> _Screens;
        private IScreen _CurrentScreen;
        private Game _Game;
        private bool _Running = false;
        public Synthy Sound = new Synthy();
        
        public FDNReverb EnvironmentEffect;
        public AudioListener Listener = new AudioListener();
        public ScreenManager(Game instance): base(instance)
        {
            EnvironmentEffect = Sound.CreateReverb();
            EnvironmentEffect.Delay = 0.03;
            EnvironmentEffect.Wet = 30;
            EnvironmentEffect.T60 = 5;
            EnvironmentEffect.Defusion = 1;
            EnvironmentEffect.FreePath = 0.22;
            
            _Game = instance;
            _Screens = new List<IScreen>();
            _CurrentScreen = null;
        }

        public override void Initialize()
        {
            _Running = true;
            foreach (var screen in _Screens)
            {
                screen.Activate();
            }
            base.Initialize();
        }

        public void AddScreen(IScreen screen)
        {
            screen.Manager = this;
            if (_Running) screen.Activate();
            _Screens.Add(screen);
        }
        public void RemoveScreen(IScreen screen)
        {
            if (!_Screens.Contains(screen))
            {
                throw new Exception("Cannot remove a screen that isn't added to manager");
            }
            screen.Deactivate();
            _Screens.Remove(screen);
        }

        public void Update(GameTime gameTime)
        {
            Sound.Update();
            var input = Keyboard.GetState();
            foreach (var screen in _Screens)
            {
                if (screen.State == ScreenState.Active) screen.HandleInput(gameTime, input);
                screen.Update(gameTime);
            }
            base.Update(gameTime);
        }
    }
}