Merge with axios-newgsm

axios/Axios_WP7.csproj

@@ -190,18 +190,32 @@
     <Compile Include="PrimitiveBatch.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ScreenSystem\BackgroundScreen.cs" />
+    <Compile Include="ScreenSystem\Button.cs" />
     <Compile Include="ScreenSystem\Camera2D.cs" />
     <Compile Include="ScreenSystem\ConvertUnits.cs" />
     <Compile Include="ScreenSystem\FramerateCounterComponent.cs" />
+    <Compile Include="ScreenSystem\GameplayScreen.cs" />
     <Compile Include="ScreenSystem\GameScreen.cs" />
     <Compile Include="ScreenSystem\IDemoScreen.cs" />
+    <Compile Include="ScreenSystem\InputAction.cs" />
     <Compile Include="ScreenSystem\InputHelper.cs" />
+    <Compile Include="ScreenSystem\InputState.cs" />
+    <Compile Include="ScreenSystem\IScreenFactory.cs" />
+    <Compile Include="ScreenSystem\LoadingScreen.cs" />
     <Compile Include="ScreenSystem\LogoScreen.cs" />
+    <Compile Include="ScreenSystem\MainMenuScreen.cs" />
     <Compile Include="ScreenSystem\MenuButton.cs" />
     <Compile Include="ScreenSystem\MenuEntry.cs" />
     <Compile Include="ScreenSystem\MenuScreen.cs" />
     <Compile Include="ScreenSystem\MessageBoxScreen.cs" />
+    <Compile Include="ScreenSystem\OptionsMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PauseMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhoneMainMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhoneMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhonePauseScreen.cs" />
     <Compile Include="ScreenSystem\PhysicsGameScreen.cs" />
+    <Compile Include="ScreenSystem\PlayerIndexEventArgs.cs" />
+    <Compile Include="ScreenSystem\ScreenManager.cs" />
     <Compile Include="ScreenSystem\ScreenManagerComponent.cs" />
     <Compile Include="ScreenSystem\SpriteFonts.cs" />
     <Compile Include="ScreenSystem\VirtualButton.cs" />
@@ -221,6 +235,7 @@
     <Reference Include="System.Core" />
     <Reference Include="system.data.linq, Version=7.0.0.0, Culture=neutral, PublicKeyToken=24eec0d8c86cda1e, processorArchitecture=MSIL" />
     <Reference Include="System.Net" />
+    <Reference Include="System.Windows, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, processorArchitecture=MSIL" />
     <Reference Include="System.Xml" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Xml.Serialization, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
@@ -229,7 +244,7 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\XNA Game Studio\Microsoft.Xna.GameStudio.targets" />
   <PropertyGroup>
-    <PostBuildEvent>if not exist "$(TargetPath)" ..\..\Combined mkdir "$(TargetPath)" ..\..\Combined
+    <PostBuildEvent>if not exist "$(TargetDir)"..\..\Combined mkdir "$(TargetDir)"..\..\Combined
 copy "$(TargetPath)" ..\..\Combined</PostBuildEvent>
   </PropertyGroup>
   <!--

axios/Axios_Windows.csproj

@@ -234,19 +234,32 @@
     <Compile Include="PrimitiveBatch.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ScreenSystem\BackgroundScreen.cs" />
+    <Compile Include="ScreenSystem\Button.cs" />
     <Compile Include="ScreenSystem\Camera2D.cs" />
     <Compile Include="ScreenSystem\ConvertUnits.cs" />
     <Compile Include="ScreenSystem\FramerateCounterComponent.cs" />
+    <Compile Include="ScreenSystem\GameplayScreen.cs" />
     <Compile Include="ScreenSystem\GameScreen.cs" />
     <Compile Include="ScreenSystem\IDemoScreen.cs" />
-    <Compile Include="ScreenSystem\InputHelper.cs" />
+    <Compile Include="ScreenSystem\InputAction.cs" />
     <Compile Include="Engine\AxiosGameScreen.cs" />
+    <Compile Include="ScreenSystem\InputState.cs" />
+    <Compile Include="ScreenSystem\IScreenFactory.cs" />
+    <Compile Include="ScreenSystem\LoadingScreen.cs" />
     <Compile Include="ScreenSystem\LogoScreen.cs" />
+    <Compile Include="ScreenSystem\MainMenuScreen.cs" />
     <Compile Include="ScreenSystem\MenuButton.cs" />
     <Compile Include="ScreenSystem\MenuEntry.cs" />
     <Compile Include="ScreenSystem\MenuScreen.cs" />
     <Compile Include="ScreenSystem\MessageBoxScreen.cs" />
+    <Compile Include="ScreenSystem\OptionsMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PauseMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhoneMainMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhoneMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhonePauseScreen.cs" />
     <Compile Include="ScreenSystem\PhysicsGameScreen.cs" />
+    <Compile Include="ScreenSystem\PlayerIndexEventArgs.cs" />
+    <Compile Include="ScreenSystem\ScreenManager.cs" />
     <Compile Include="ScreenSystem\ScreenManagerComponent.cs" />
     <Compile Include="ScreenSystem\SpriteFonts.cs" />
     <Compile Include="ScreenSystem\VirtualButton.cs" />
@@ -260,7 +273,7 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\XNA Game Studio\Microsoft.Xna.GameStudio.targets" />
   <PropertyGroup>
-    <PostBuildEvent>if not exist "$(TargetPath)" ..\..\Combined mkdir "$(TargetPath)" ..\..\Combined
+    <PostBuildEvent>if not exist "$(TargeDir)"..\..\Combined mkdir "$(TargetDir)"..\..\Combined
 copy "$(TargetPath)" ..\..\Combined</PostBuildEvent>
   </PropertyGroup>
   <!--

axios/Axios_Xbox_360.csproj

@@ -183,18 +183,31 @@
     <Compile Include="PrimitiveBatch.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ScreenSystem\BackgroundScreen.cs" />
+    <Compile Include="ScreenSystem\Button.cs" />
     <Compile Include="ScreenSystem\Camera2D.cs" />
     <Compile Include="ScreenSystem\ConvertUnits.cs" />
     <Compile Include="ScreenSystem\FramerateCounterComponent.cs" />
+    <Compile Include="ScreenSystem\GameplayScreen.cs" />
     <Compile Include="ScreenSystem\GameScreen.cs" />
     <Compile Include="ScreenSystem\IDemoScreen.cs" />
-    <Compile Include="ScreenSystem\InputHelper.cs" />
+    <Compile Include="ScreenSystem\InputAction.cs" />
+    <Compile Include="ScreenSystem\InputState.cs" />
+    <Compile Include="ScreenSystem\IScreenFactory.cs" />
+    <Compile Include="ScreenSystem\LoadingScreen.cs" />
     <Compile Include="ScreenSystem\LogoScreen.cs" />
+    <Compile Include="ScreenSystem\MainMenuScreen.cs" />
     <Compile Include="ScreenSystem\MenuButton.cs" />
     <Compile Include="ScreenSystem\MenuEntry.cs" />
     <Compile Include="ScreenSystem\MenuScreen.cs" />
     <Compile Include="ScreenSystem\MessageBoxScreen.cs" />
+    <Compile Include="ScreenSystem\OptionsMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PauseMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhoneMainMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhoneMenuScreen.cs" />
+    <Compile Include="ScreenSystem\PhonePauseScreen.cs" />
     <Compile Include="ScreenSystem\PhysicsGameScreen.cs" />
+    <Compile Include="ScreenSystem\PlayerIndexEventArgs.cs" />
+    <Compile Include="ScreenSystem\ScreenManager.cs" />
     <Compile Include="ScreenSystem\ScreenManagerComponent.cs" />
     <Compile Include="ScreenSystem\SpriteFonts.cs" />
     <Compile Include="ScreenSystem\VirtualButton.cs" />
@@ -224,7 +237,7 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\XNA Game Studio\Microsoft.Xna.GameStudio.targets" />
   <PropertyGroup>
-    <PostBuildEvent>if not exist "$(TargetPath)" ..\..\Combined mkdir "$(TargetPath)" ..\..\Combined
+    <PostBuildEvent>if not exist "$(TargetDir)"..\..\Combined mkdir "$(TargetDir)"..\..\Combined
 copy "$(TargetPath)" ..\..\Combined</PostBuildEvent>
   </PropertyGroup>
   <!--

axios/Engine/AxiosEvents.cs

@@ -1,5 +1,6 @@
 using System;
 using FarseerPhysics.SamplesFramework;
+using GameStateManagement;
 
 namespace Axios.Engine
 {
@@ -19,45 +20,45 @@ namespace Axios.Engine
             }
         }
 
-        public delegate void AxiosHandler(object sender, AxiosGameScreen gameScreen, InputHelper input);
+        public delegate void AxiosHandler(object sender, AxiosGameScreen gameScreen, InputState input);
         
         public delegate void AxiosGameObjectHandler(AxiosGameObject sender);
 
         #region GameObjectEventMethods
 
-        public virtual void OnFocusEnter(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void OnFocusEnter(AxiosGameScreen gameScreen, InputState input)
         {
             this.HasFocus = true;
             this.OnEvent(FocusEnter, gameScreen, input);
         }
 
-        public virtual void OnFocusLeave(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void OnFocusLeave(AxiosGameScreen gameScreen, InputState input)
         {
             this.HasFocus = false;
             this.OnEvent(FocusLeave, gameScreen, input);
         }
 
-        public virtual void OnMouseHover(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void OnMouseHover(AxiosGameScreen gameScreen, InputState input)
         {
             this.OnEvent(MouseHover, gameScreen, input);
         }
 
-        public virtual void OnMouseLeave(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void OnMouseLeave(AxiosGameScreen gameScreen, InputState input)
         {
             this.OnEvent(MouseLeave, gameScreen, input);
         }
 
-        public virtual void OnValueChange(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void OnValueChange(AxiosGameScreen gameScreen, InputState input)
         {
             this.OnEvent(ValueChange, gameScreen, input);
         }
 
-        public virtual void OnMouseDown(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void OnMouseDown(AxiosGameScreen gameScreen, InputState input)
         {
             this.OnEvent(MouseDown, gameScreen, input);
         }
 
-        public virtual void OnMouseUp(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void OnMouseUp(AxiosGameScreen gameScreen, InputState input)
         {
             this.OnEvent(MouseUp, gameScreen, input);
         }
@@ -68,7 +69,7 @@ namespace Axios.Engine
                 this.ScaleChanged(gameObject);
         }
 
-        private void OnEvent(AxiosHandler e, AxiosGameScreen gameScreen, InputHelper input)
+        private void OnEvent(AxiosHandler e, AxiosGameScreen gameScreen, InputState input)
         {
             AxiosHandler handle = e;
             if (handle != null)

axios/Engine/AxiosGameObject.cs

@@ -2,6 +2,7 @@
 using FarseerPhysics.Dynamics;
 using FarseerPhysics.SamplesFramework;
 using Microsoft.Xna.Framework;
+using GameStateManagement;
 
 namespace Axios.Engine
 {
@@ -46,12 +47,12 @@ namespace Axios.Engine
 
         }
 
-        public virtual void HandleInput(AxiosGameScreen gameScreen, InputHelper input, GameTime gameTime)
+        public virtual void HandleInput(AxiosGameScreen gameScreen, InputState input, GameTime gameTime)
         {
 
         }
 
-        public virtual void HandleCursor(AxiosGameScreen gameScreen, InputHelper input)
+        public virtual void HandleCursor(AxiosGameScreen gameScreen, InputState input)
         {
 
         }

axios/Engine/AxiosGameScreen.cs

@@ -8,7 +8,9 @@ using Axios.Engine.UI;
 using FarseerPhysics.Dynamics;
 using FarseerPhysics.SamplesFramework;
 using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
+using GameStateManagement;
 
 namespace Axios.Engine
 {
@@ -158,19 +160,16 @@ namespace Axios.Engine
             AxiosLog.Instance.AddLine("Memory usage after cleanup: ", LoggingFlag.DEBUG);
         }
 
-        public override void ExitScreen()
+        public override void Activate(bool instancePreserved)
         {
-            base.ExitScreen();
+            base.Activate(instancePreserved);
-
-        }
-
-        public override void LoadContent()
-        {
-            base.LoadContent();
 
 #if DEBUG
             if (!Axios.Settings.ScreenSaver)
-                this.DebugSpriteFont = this.ScreenManager.Content.Load<SpriteFont>(this.DebugTextFont);
+            {
+                ContentManager man = new ContentManager(ScreenManager.Game.Services, "Content");
+                this.DebugSpriteFont = man.Load<SpriteFont>(this.DebugTextFont);
+            }
 #endif
         }
 
@@ -211,7 +210,7 @@ namespace Axios.Engine
             
         }
 
-        public override void HandleCursor(InputHelper input)
+        public override void HandleCursor(InputState input)
         {
             base.HandleCursor(input);
             HandleMouseEvents(input);
@@ -220,7 +219,7 @@ namespace Axios.Engine
                 g.HandleCursor(this, input);
         }
 
-        private void HandleMouseEvents(InputHelper input)
+        private void HandleMouseEvents(InputState input)
         {
             Vector2 position = this.Camera.ConvertScreenToWorld(input.Cursor);
             Fixture fix = this.World.TestPoint(position);
@@ -335,9 +334,9 @@ namespace Axios.Engine
             }
         }
 
-        public override void HandleInput(InputHelper input, GameTime gameTime)
+        public override void HandleInput(GameTime gameTime, InputState input)
         {
-            base.HandleInput(input, gameTime);
+            base.HandleInput(gameTime, input);
 
             foreach (AxiosGameObject g in _gameObjects.ToList())
                 g.HandleInput(this, input, gameTime);
@@ -346,9 +345,9 @@ namespace Axios.Engine
                 g.HandleInput(this, input, gameTime);
         }
 
-        public override void UnloadContent()
+        public override void Deactivate()
         {
-            base.UnloadContent();
+            base.Deactivate();
             //AxiosLog.Instance.AddLine("Memory usage before cleanup: " + GC.GetTotalMemory(true).ToString(), LoggingFlag.DEBUG);
             foreach (AxiosGameObject g in _gameObjects)
                 g.UnloadContent(this);

axios/Engine/AxiosTimer.cs

@@ -2,6 +2,7 @@
 
 using Axios.Engine.Interfaces;
 using Microsoft.Xna.Framework;
+using GameStateManagement;
 
 namespace Axios.Engine
 {
@@ -66,12 +67,12 @@ namespace Axios.Engine
             
         }
 
-        public override void HandleInput(AxiosGameScreen gameScreen, FarseerPhysics.SamplesFramework.InputHelper input, Microsoft.Xna.Framework.GameTime gameTime)
+        public override void HandleInput(AxiosGameScreen gameScreen, InputState input, Microsoft.Xna.Framework.GameTime gameTime)
         {
             
         }
 
-        public override void HandleCursor(AxiosGameScreen gameScreen, FarseerPhysics.SamplesFramework.InputHelper input)
+        public override void HandleCursor(AxiosGameScreen gameScreen, InputState input)
         {
             
         }

axios/Engine/Interfaces/IAxiosGameObject.cs

@@ -1,5 +1,6 @@
 using FarseerPhysics.SamplesFramework;
 using Microsoft.Xna.Framework;
+using GameStateManagement;
 
 
 namespace Axios.Engine.Interfaces
@@ -8,8 +9,8 @@ namespace Axios.Engine.Interfaces
     {
         void Update(AxiosGameScreen gameScreen, GameTime gameTime, bool otherScreenHasFocus, bool coveredByOtherScreen);
         void LoadContent(AxiosGameScreen gameScreen);
-        void HandleInput(AxiosGameScreen gameScreen, InputHelper input, GameTime gameTime);
+        void HandleInput(AxiosGameScreen gameScreen, InputState input, GameTime gameTime);
-        void HandleCursor(AxiosGameScreen gameScreen, InputHelper input);
+        void HandleCursor(AxiosGameScreen gameScreen, InputState input);
         void UnloadContent(AxiosGameScreen gameScreen);
     }
 }

axios/Engine/UI/AxiosButton.cs

@@ -1,6 +1,7 @@
 
 using FarseerPhysics.SamplesFramework;
 using Microsoft.Xna.Framework.Graphics;
+using GameStateManagement;
 
 namespace Axios.Engine.UI
 {
@@ -48,7 +49,7 @@ namespace Axios.Engine.UI
 
         }
 
-        public override void OnMouseHover(AxiosGameScreen gameScreen, InputHelper input)
+        public override void OnMouseHover(AxiosGameScreen gameScreen, InputState input)
         {
             base.OnMouseHover(gameScreen, input);
             
@@ -56,21 +57,21 @@ namespace Axios.Engine.UI
             
         }
 
-        public override void OnMouseLeave(AxiosGameScreen gameScreen, InputHelper input)
+        public override void OnMouseLeave(AxiosGameScreen gameScreen, InputState input)
         {
             base.OnMouseLeave(gameScreen, input);
 
             this.Texture = _normaltexture;
         }
 
-        public override void OnMouseDown(AxiosGameScreen gameScreen, InputHelper input)
+        public override void OnMouseDown(AxiosGameScreen gameScreen, InputState input)
         {
             base.OnMouseDown(gameScreen, input);
 
             this.Texture = _clicktexture;
         }
 
-        public override void OnMouseUp(AxiosGameScreen gameScreen, InputHelper input)
+        public override void OnMouseUp(AxiosGameScreen gameScreen, InputState input)
         {
             base.OnMouseUp(gameScreen, input);
 
@@ -81,7 +82,7 @@ namespace Axios.Engine.UI
 
 
 
-        public override void HandleCursor(AxiosGameScreen gameScreen, InputHelper input)
+        public override void HandleCursor(AxiosGameScreen gameScreen, InputState input)
         {
             base.HandleCursor(gameScreen, input);
 

axios/ScreenSystem/BackgroundScreen.cs

@@ -1,8 +1,21 @@
-using System;
+#region File Description
-using Microsoft.Xna.Framework;
+//-----------------------------------------------------------------------------
-using Microsoft.Xna.Framework.Graphics;
+// BackgroundScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
 
-namespace FarseerPhysics.SamplesFramework
+#region Using Statements
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
+using Microsoft.Xna.Framework.Graphics;
+using GameStateManagement;
+#endregion
+
+namespace GameStateManagement
 {
     /// <summary>
     /// The background screen sits behind all the other menu screens.
@@ -11,14 +24,15 @@ namespace FarseerPhysics.SamplesFramework
     /// </summary>
     public class BackgroundScreen : GameScreen
     {
-        private const float LogoScreenHeightRatio = 0.25f;
+        #region Fields
-        private const float LogoScreenBorderRatio = 0.0375f;
+
-        private const float LogoWidthHeightRatio = 1.4f;
+        ContentManager content;
+        Texture2D backgroundTexture;
+
+        #endregion
+
+        #region Initialization
 
-        private Texture2D _backgroundTexture;
-        private Rectangle _logoDestination;
-        //private Texture2D _logoTexture;
-        private Rectangle _viewport;
 
         /// <summary>
         /// Constructor.
@@ -29,24 +43,40 @@ namespace FarseerPhysics.SamplesFramework
             TransitionOffTime = TimeSpan.FromSeconds(0.5);
         }
 
-        public override void LoadContent()
+
+        /// <summary>
+        /// Loads graphics content for this screen. The background texture is quite
+        /// big, so we use our own local ContentManager to load it. This allows us
+        /// to unload before going from the menus into the game itself, wheras if we
+        /// used the shared ContentManager provided by the Game class, the content
+        /// would remain loaded forever.
+        /// </summary>
+        public override void Activate(bool instancePreserved)
         {
-            //_logoTexture = ScreenManager.Content.Load<Texture2D>("Common/logo");
+            if (!instancePreserved)
-            _backgroundTexture = ScreenManager.Content.Load<Texture2D>("Common/gradient");
+            {
+                if (content == null)
+                    content = new ContentManager(ScreenManager.Game.Services, "Content");
 
-            Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
+                backgroundTexture = content.Load<Texture2D>("background");
-            Vector2 logoSize = new Vector2();
+            }
-            logoSize.Y = viewport.Height * LogoScreenHeightRatio;
-            logoSize.X = logoSize.Y * LogoWidthHeightRatio;
-
-            float border = viewport.Height * LogoScreenBorderRatio;
-            Vector2 logoPosition = new Vector2(viewport.Width - border - logoSize.X,
-                                               viewport.Height - border - logoSize.Y);
-            _logoDestination = new Rectangle((int)logoPosition.X, (int)logoPosition.Y, (int)logoSize.X,
-                                             (int)logoSize.Y);
-            _viewport = viewport.Bounds;
         }
 
+
+        /// <summary>
+        /// Unloads graphics content for this screen.
+        /// </summary>
+        public override void Unload()
+        {
+            content.Unload();
+        }
+
+
+        #endregion
+
+        #region Update and Draw
+
+
         /// <summary>
         /// Updates the background screen. Unlike most screens, this should not
         /// transition off even if it has been covered by another screen: it is
@@ -55,20 +85,30 @@ namespace FarseerPhysics.SamplesFramework
         /// Update method wanting to transition off.
         /// </summary>
         public override void Update(GameTime gameTime, bool otherScreenHasFocus,
-                                    bool coveredByOtherScreen)
+                                                       bool coveredByOtherScreen)
         {
             base.Update(gameTime, otherScreenHasFocus, false);
         }
 
+
         /// <summary>
         /// Draws the background screen.
         /// </summary>
         public override void Draw(GameTime gameTime)
         {
-            ScreenManager.SpriteBatch.Begin();
+            SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
-            ScreenManager.SpriteBatch.Draw(_backgroundTexture, _viewport, Color.White);
+            Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
-            //ScreenManager.SpriteBatch.Draw(_logoTexture, _logoDestination, Color.White * 0.6f);
+            Rectangle fullscreen = new Rectangle(0, 0, viewport.Width, viewport.Height);
-            ScreenManager.SpriteBatch.End();
+
+            spriteBatch.Begin();
+
+            spriteBatch.Draw(backgroundTexture, fullscreen,
+                             new Color(TransitionAlpha, TransitionAlpha, TransitionAlpha));
+
+            spriteBatch.End();
         }
+
+
+        #endregion
     }
 }

axios/ScreenSystem/Button.cs

@@ -0,0 +1,191 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// Button.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+using System;
+using GameStateManagement;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// A special button that handles toggling between "On" and "Off"
+    /// </summary>
+    class BooleanButton : Button
+    {
+        private string option;
+        private bool value;
+
+        /// <summary>
+        /// Creates a new BooleanButton.
+        /// </summary>
+        /// <param name="option">The string text to display for the option.</param>
+        /// <param name="value">The initial value of the button.</param>
+        public BooleanButton(string option, bool value)
+            : base(option)
+        {
+            this.option = option;
+            this.value = value;
+
+            GenerateText();
+        }
+
+        protected override void OnTapped()
+        {
+            // When tapped we need to toggle the value and regenerate the text
+            value = !value;
+            GenerateText();
+
+            base.OnTapped();
+        }
+
+        /// <summary>
+        /// Helper that generates the actual Text value the base class uses for drawing.
+        /// </summary>
+        private void GenerateText()
+        {
+            Text = string.Format("{0}: {1}", option, value ? "On" : "Off");
+        }
+    }
+
+    /// <summary>
+    /// Represents a touchable button.
+    /// </summary>
+    class Button
+    {
+        /// <summary>
+        /// The text displayed in the button.
+        /// </summary>
+        public string Text = "Button";
+
+        /// <summary>
+        /// The position of the top-left corner of the button.
+        /// </summary>
+        public Vector2 Position = Vector2.Zero;
+
+        /// <summary>
+        /// The size of the button.
+        /// </summary>
+        public Vector2 Size = new Vector2(250, 75);
+
+        /// <summary>
+        /// The thickness of the border drawn for the button.
+        /// </summary>
+        public int BorderThickness = 4;
+
+        /// <summary>
+        /// The color of the button border.
+        /// </summary>
+        public Color BorderColor = new Color(200, 200, 200);
+
+        /// <summary>
+        /// The color of the button background.
+        /// </summary>
+        public Color FillColor = new Color(100, 100, 100) * .75f;
+
+        /// <summary>
+        /// The color of the text.
+        /// </summary>
+        public Color TextColor = Color.White;
+
+        /// <summary>
+        /// The opacity of the button.
+        /// </summary>
+        public float Alpha = 0f;
+
+        /// <summary>
+        /// Invoked when the button is tapped.
+        /// </summary>
+        public event EventHandler<EventArgs> Tapped;
+        
+        /// <summary>
+        /// Creates a new Button.
+        /// </summary>
+        /// <param name="text">The text to display in the button.</param>
+        public Button(string text)
+        {
+            Text = text;
+        }
+
+        /// <summary>
+        /// Invokes the Tapped event and allows subclasses to perform actions when tapped.
+        /// </summary>
+        protected virtual void OnTapped()
+        {
+            if (Tapped != null)
+                Tapped(this, EventArgs.Empty);
+        }
+
+        /// <summary>
+        /// Passes a tap location to the button for handling.
+        /// </summary>
+        /// <param name="tap">The location of the tap.</param>
+        /// <returns>True if the button was tapped, false otherwise.</returns>
+        public bool HandleTap(Vector2 tap)
+        {
+            if (tap.X >= Position.X &&
+                tap.Y >= Position.Y &&
+                tap.X <= Position.X + Size.X &&
+                tap.Y <= Position.Y + Size.Y)
+            {
+                OnTapped();
+                return true;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Draws the button
+        /// </summary>
+        /// <param name="screen">The screen drawing the button</param>
+        public void Draw(GameScreen screen)
+        {
+            // Grab some common items from the ScreenManager
+            SpriteBatch spriteBatch = screen.ScreenManager.SpriteBatch;
+            SpriteFont font = screen.ScreenManager.Font;
+            Texture2D blank = screen.ScreenManager.BlankTexture;
+
+            // Compute the button's rectangle
+            Rectangle r = new Rectangle(
+                (int)Position.X,
+                (int)Position.Y,
+                (int)Size.X,
+                (int)Size.Y);
+
+            // Fill the button
+            spriteBatch.Draw(blank, r, FillColor * Alpha);
+
+            // Draw the border
+            spriteBatch.Draw(
+                blank, 
+                new Rectangle(r.Left, r.Top, r.Width, BorderThickness),
+                BorderColor * Alpha);
+            spriteBatch.Draw(
+                blank, 
+                new Rectangle(r.Left, r.Top, BorderThickness, r.Height),
+                BorderColor * Alpha);
+            spriteBatch.Draw(
+                blank, 
+                new Rectangle(r.Right - BorderThickness, r.Top, BorderThickness, r.Height),
+                BorderColor * Alpha);
+            spriteBatch.Draw(
+                blank, 
+                new Rectangle(r.Left, r.Bottom - BorderThickness, r.Width, BorderThickness),
+                BorderColor * Alpha);
+
+            // Draw the text centered in the button
+            Vector2 textSize = font.MeasureString(Text);
+            Vector2 textPosition = new Vector2(r.Center.X, r.Center.Y) - textSize / 2f;
+            textPosition.X = (int)textPosition.X;
+            textPosition.Y = (int)textPosition.Y;
+            spriteBatch.DrawString(font, Text, textPosition, TextColor * Alpha);
+        }
+    }
+}

axios/ScreenSystem/FramerateCounterComponent.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Globalization;
 using Microsoft.Xna.Framework;
+using GameStateManagement;
 
 namespace FarseerPhysics.SamplesFramework
 {

axios/ScreenSystem/GameScreen.cs

@@ -1,19 +1,18 @@
 #region File Description
-
 //-----------------------------------------------------------------------------
-// PlayerIndexEventArgs.cs
+// GameScreen.cs
 //
-// XNA Community Game Platform
+// Microsoft XNA Community Game Platform
 // Copyright (C) Microsoft Corporation. All rights reserved.
 //-----------------------------------------------------------------------------
-
 #endregion
 
 using System;
+using System.IO;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Input.Touch;
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
     /// <summary>
     /// Enum describes the screen transition state.
@@ -26,6 +25,7 @@ namespace FarseerPhysics.SamplesFramework
         Hidden,
     }
 
+
     /// <summary>
     /// A screen is a single layer that has update and draw logic, and which
     /// can be combined with other layers to build up a complex menu system.
@@ -35,23 +35,13 @@ namespace FarseerPhysics.SamplesFramework
     /// </summary>
     public abstract class GameScreen
     {
-        private GestureType _enabledGestures = GestureType.None;
-        private bool _otherScreenHasFocus;
 
         public GameScreen()
         {
-            ScreenState = ScreenState.TransitionOn;
-            TransitionPosition = 1;
-            TransitionOffTime = TimeSpan.Zero;
-            TransitionOnTime = TimeSpan.Zero;
-            HasCursor = false;
             HasVirtualStick = false;
+            HasCursor = false;
         }
-
+        public bool HasCursor = false;
-        public bool HasCursor { get; set; }
-
-        public bool HasVirtualStick { get; set; }
-
         /// <summary>
         /// Normally when one screen is brought up over the top of another,
         /// the first screen will transition off to make room for the new
@@ -59,26 +49,54 @@ namespace FarseerPhysics.SamplesFramework
         /// popup, in which case screens underneath it do not need to bother
         /// transitioning off.
         /// </summary>
-        public bool IsPopup { get; protected set; }
+        public bool IsPopup
+        {
+            get { return isPopup; }
+            protected set { isPopup = value; }
+        }
+
+        bool isPopup = false;
+        public bool HasVirtualStick { get; set; }
 
         /// <summary>
         /// Indicates how long the screen takes to
         /// transition on when it is activated.
         /// </summary>
-        public TimeSpan TransitionOnTime { get; protected set; }
+        public TimeSpan TransitionOnTime
+        {
+            get { return transitionOnTime; }
+            protected set { transitionOnTime = value; }
+        }
+
+        TimeSpan transitionOnTime = TimeSpan.Zero;
+
 
         /// <summary>
         /// Indicates how long the screen takes to
         /// transition off when it is deactivated.
         /// </summary>
-        public TimeSpan TransitionOffTime { get; protected set; }
+        public TimeSpan TransitionOffTime
+        {
+            get { return transitionOffTime; }
+            protected set { transitionOffTime = value; }
+        }
+
+        TimeSpan transitionOffTime = TimeSpan.Zero;
+
 
         /// <summary>
         /// Gets the current position of the screen transition, ranging
         /// from zero (fully active, no transition) to one (transitioned
         /// fully off to nothing).
         /// </summary>
-        public float TransitionPosition { get; protected set; }
+        public float TransitionPosition
+        {
+            get { return transitionPosition; }
+            protected set { transitionPosition = value; }
+        }
+
+        float transitionPosition = 1;
+
 
         /// <summary>
         /// Gets the current alpha of the screen transition, ranging
@@ -90,10 +108,18 @@ namespace FarseerPhysics.SamplesFramework
             get { return 1f - TransitionPosition; }
         }
 
+
         /// <summary>
         /// Gets the current screen transition state.
         /// </summary>
-        public ScreenState ScreenState { get; protected set; }
+        public ScreenState ScreenState
+        {
+            get { return screenState; }
+            protected set { screenState = value; }
+        }
+
+        ScreenState screenState = ScreenState.TransitionOn;
+
 
         /// <summary>
         /// There are two possible reasons why a screen might be transitioning
@@ -103,9 +129,14 @@ namespace FarseerPhysics.SamplesFramework
         /// if set, the screen will automatically remove itself as soon as the
         /// transition finishes.
         /// </summary>
-        public bool IsExiting { get; protected internal set; }
+        public bool IsExiting
+        {
+            get { return isExiting; }
+            protected internal set { isExiting = value; }
+        }
+
+        bool isExiting = false;
 
-        public bool AlwaysHasFocus = false;
 
         /// <summary>
         /// Checks whether this screen is active and can respond to user input.
@@ -114,16 +145,43 @@ namespace FarseerPhysics.SamplesFramework
         {
             get
             {
-                return !_otherScreenHasFocus &&
+                return !otherScreenHasFocus &&
-                       (ScreenState == ScreenState.TransitionOn ||
+                       (screenState == ScreenState.TransitionOn ||
-                        ScreenState == ScreenState.Active);
+                        screenState == ScreenState.Active);
             }
         }
 
+        bool otherScreenHasFocus;
+
+
         /// <summary>
         /// Gets the manager that this screen belongs to.
         /// </summary>
-        public ScreenManager ScreenManager { get; internal set; }
+        public ScreenManager ScreenManager
+        {
+            get { return screenManager; }
+            internal set { screenManager = value; }
+        }
+
+        ScreenManager screenManager;
+
+
+        /// <summary>
+        /// Gets the index of the player who is currently controlling this screen,
+        /// or null if it is accepting input from any player. This is used to lock
+        /// the game to a specific player profile. The main menu responds to input
+        /// from any connected gamepad, but whichever player makes a selection from
+        /// this menu is given control over all subsequent screens, so other gamepads
+        /// are inactive until the controlling player returns to the main menu.
+        /// </summary>
+        public PlayerIndex? ControllingPlayer
+        {
+            get { return controllingPlayer; }
+            internal set { controllingPlayer = value; }
+        }
+
+        PlayerIndex? controllingPlayer;
+
 
         /// <summary>
         /// Gets the gestures the screen is interested in. Screens should be as specific
@@ -134,10 +192,10 @@ namespace FarseerPhysics.SamplesFramework
         /// </summary>
         public GestureType EnabledGestures
         {
-            get { return _enabledGestures; }
+            get { return enabledGestures; }
             protected set
             {
-                _enabledGestures = value;
+                enabledGestures = value;
 
                 // the screen manager handles this during screen changes, but
                 // if this screen is active and the gesture types are changing,
@@ -149,36 +207,62 @@ namespace FarseerPhysics.SamplesFramework
             }
         }
 
-        /// <summary>
+        GestureType enabledGestures = GestureType.None;
-        /// Load graphics content for the screen.
-        /// </summary>
-        public virtual void LoadContent()
-        {
-        }
 
         /// <summary>
-        /// Unload content for the screen.
+        /// Gets whether or not this screen is serializable. If this is true,
+        /// the screen will be recorded into the screen manager's state and
+        /// its Serialize and Deserialize methods will be called as appropriate.
+        /// If this is false, the screen will be ignored during serialization.
+        /// By default, all screens are assumed to be serializable.
         /// </summary>
-        public virtual void UnloadContent()
+        public bool IsSerializable
         {
+            get { return isSerializable; }
+            protected set { isSerializable = value; }
         }
 
+        bool isSerializable = true;
+        
+        
+        /// <summary>
+        /// Activates the screen. Called when the screen is added to the screen manager or if the game resumes
+        /// from being paused or tombstoned.
+        /// </summary>
+        /// <param name="instancePreserved">
+        /// True if the game was preserved during deactivation, false if the screen is just being added or if the game was tombstoned.
+        /// On Xbox and Windows this will always be false.
+        /// </param>
+        public virtual void Activate(bool instancePreserved) { }
+
+        
+        /// <summary>
+        /// Deactivates the screen. Called when the game is being deactivated due to pausing or tombstoning.
+        /// </summary>
+        public virtual void Deactivate() { }
+
+
+        /// <summary>
+        /// Unload content for the screen. Called when the screen is removed from the screen manager.
+        /// </summary>
+        public virtual void Unload() { }
+
+
         /// <summary>
         /// Allows the screen to run logic, such as updating the transition position.
         /// Unlike HandleInput, this method is called regardless of whether the screen
         /// is active, hidden, or in the middle of a transition.
         /// </summary>
-        public virtual void Update(GameTime gameTime, bool otherScreenHasFocus,
+        public virtual void Update(GameTime gameTime, bool otherScreenHasFocus, bool coveredByOtherScreen)
-                                   bool coveredByOtherScreen)
         {
-            _otherScreenHasFocus = otherScreenHasFocus;
+            this.otherScreenHasFocus = otherScreenHasFocus;
 
-            if (IsExiting)
+            if (isExiting)
             {
                 // If the screen is going away to die, it should transition off.
-                ScreenState = ScreenState.TransitionOff;
+                screenState = ScreenState.TransitionOff;
 
-                if (!UpdateTransition(gameTime, TransitionOffTime, 1))
+                if (!UpdateTransition(gameTime, transitionOffTime, 1))
                 {
                     // When the transition finishes, remove the screen.
                     ScreenManager.RemoveScreen(this);
@@ -187,59 +271,55 @@ namespace FarseerPhysics.SamplesFramework
             else if (coveredByOtherScreen)
             {
                 // If the screen is covered by another, it should transition off.
-                if (UpdateTransition(gameTime, TransitionOffTime, 1))
+                if (UpdateTransition(gameTime, transitionOffTime, 1))
                 {
                     // Still busy transitioning.
-                    ScreenState = ScreenState.TransitionOff;
+                    screenState = ScreenState.TransitionOff;
                 }
                 else
                 {
                     // Transition finished!
-                    ScreenState = ScreenState.Hidden;
+                    screenState = ScreenState.Hidden;
                 }
             }
             else
             {
                 // Otherwise the screen should transition on and become active.
-                if (UpdateTransition(gameTime, TransitionOnTime, -1))
+                if (UpdateTransition(gameTime, transitionOnTime, -1))
                 {
                     // Still busy transitioning.
-                    ScreenState = ScreenState.TransitionOn;
+                    screenState = ScreenState.TransitionOn;
                 }
                 else
                 {
                     // Transition finished!
-                    ScreenState = ScreenState.Active;
+                    screenState = ScreenState.Active;
                 }
             }
         }
 
+
         /// <summary>
         /// Helper for updating the screen transition position.
         /// </summary>
-        private bool UpdateTransition(GameTime gameTime, TimeSpan time, int direction)
+        bool UpdateTransition(GameTime gameTime, TimeSpan time, int direction)
         {
             // How much should we move by?
             float transitionDelta;
 
             if (time == TimeSpan.Zero)
-            {
+                transitionDelta = 1;
-                transitionDelta = 1f;
-            }
             else
-            {
+                transitionDelta = (float)(gameTime.ElapsedGameTime.TotalMilliseconds / time.TotalMilliseconds);
-                transitionDelta = (float)(gameTime.ElapsedGameTime.TotalMilliseconds /
-                                           time.TotalMilliseconds);
-            }
 
             // Update the transition position.
-            TransitionPosition += transitionDelta * direction;
+            transitionPosition += transitionDelta * direction;
 
             // Did we reach the end of the transition?
-            if (((direction < 0) && (TransitionPosition <= 0)) ||
+            if (((direction < 0) && (transitionPosition <= 0)) ||
-                ((direction > 0) && (TransitionPosition >= 1)))
+                ((direction > 0) && (transitionPosition >= 1)))
             {
-                TransitionPosition = MathHelper.Clamp(TransitionPosition, 0, 1);
+                transitionPosition = MathHelper.Clamp(transitionPosition, 0, 1);
                 return false;
             }
 
@@ -247,30 +327,29 @@ namespace FarseerPhysics.SamplesFramework
             return true;
         }
 
+
         /// <summary>
         /// Allows the screen to handle user input. Unlike Update, this method
         /// is only called when the screen is active, and not when some other
         /// screen has taken the focus.
         /// </summary>
-        public virtual void HandleInput(InputHelper input, GameTime gameTime)
+        public virtual void HandleInput(GameTime gameTime, InputState input) { }
-        {
+
-        }
 
         /// <summary>
         /// This is called when the screen should draw itself.
         /// </summary>
-        public virtual void Draw(GameTime gameTime)
+        public virtual void Draw(GameTime gameTime) { }
-        {
+
-        }
 
         /// <summary>
         /// Tells the screen to go away. Unlike ScreenManager.RemoveScreen, which
         /// instantly kills the screen, this method respects the transition timings
         /// and will give the screen a chance to gradually transition off.
         /// </summary>
-        public virtual void ExitScreen()
+        public void ExitScreen()
         {
-            if (TransitionOffTime == TimeSpan.Zero && this.TransitionPosition == 0 && this.TransitionAlpha == 1)
+            if (TransitionOffTime == TimeSpan.Zero)
             {
                 // If the screen has a zero transition time, remove it immediately.
                 ScreenManager.RemoveScreen(this);
@@ -278,7 +357,7 @@ namespace FarseerPhysics.SamplesFramework
             else
             {
                 // Otherwise flag that it should transition off and then exit.
-                IsExiting = true;
+                isExiting = true;
             }
         }
     }

axios/ScreenSystem/GameplayScreen.cs

@@ -0,0 +1,265 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// GameplayScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using System;
+using System.Threading;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+using GameStateManagement;
+#endregion
+
+namespace GameStateManagementSample
+{
+    /// <summary>
+    /// This screen implements the actual game logic. It is just a
+    /// placeholder to get the idea across: you'll probably want to
+    /// put some more interesting gameplay in here!
+    /// </summary>
+    class GameplayScreen : GameScreen
+    {
+        #region Fields
+
+        ContentManager content;
+        SpriteFont gameFont;
+
+        Vector2 playerPosition = new Vector2(100, 100);
+        Vector2 enemyPosition = new Vector2(100, 100);
+
+        Random random = new Random();
+
+        float pauseAlpha;
+
+        InputAction pauseAction;
+
+        #endregion
+
+        #region Initialization
+
+
+        /// <summary>
+        /// Constructor.
+        /// </summary>
+        public GameplayScreen()
+        {
+            TransitionOnTime = TimeSpan.FromSeconds(1.5);
+            TransitionOffTime = TimeSpan.FromSeconds(0.5);
+
+            pauseAction = new InputAction(
+                new Buttons[] { Buttons.Start, Buttons.Back },
+                new Keys[] { Keys.Escape },
+                true);
+        }
+
+
+        /// <summary>
+        /// Load graphics content for the game.
+        /// </summary>
+        public override void Activate(bool instancePreserved)
+        {
+            if (!instancePreserved)
+            {
+                if (content == null)
+                    content = new ContentManager(ScreenManager.Game.Services, "Content");
+
+                gameFont = content.Load<SpriteFont>("gamefont");
+
+                // A real game would probably have more content than this sample, so
+                // it would take longer to load. We simulate that by delaying for a
+                // while, giving you a chance to admire the beautiful loading screen.
+                Thread.Sleep(1000);
+
+                // once the load has finished, we use ResetElapsedTime to tell the game's
+                // timing mechanism that we have just finished a very long frame, and that
+                // it should not try to catch up.
+                ScreenManager.Game.ResetElapsedTime();
+            }
+
+#if WINDOWS_PHONE
+            if (Microsoft.Phone.Shell.PhoneApplicationService.Current.State.ContainsKey("PlayerPosition"))
+            {
+                playerPosition = (Vector2)Microsoft.Phone.Shell.PhoneApplicationService.Current.State["PlayerPosition"];
+                enemyPosition = (Vector2)Microsoft.Phone.Shell.PhoneApplicationService.Current.State["EnemyPosition"];
+            }
+#endif
+        }
+
+
+        public override void Deactivate()
+        {
+#if WINDOWS_PHONE
+            Microsoft.Phone.Shell.PhoneApplicationService.Current.State["PlayerPosition"] = playerPosition;
+            Microsoft.Phone.Shell.PhoneApplicationService.Current.State["EnemyPosition"] = enemyPosition;
+#endif
+
+            base.Deactivate();
+        }
+
+
+        /// <summary>
+        /// Unload graphics content used by the game.
+        /// </summary>
+        public override void Unload()
+        {
+            content.Unload();
+
+#if WINDOWS_PHONE
+            Microsoft.Phone.Shell.PhoneApplicationService.Current.State.Remove("PlayerPosition");
+            Microsoft.Phone.Shell.PhoneApplicationService.Current.State.Remove("EnemyPosition");
+#endif
+        }
+
+
+        #endregion
+
+        #region Update and Draw
+
+
+        /// <summary>
+        /// Updates the state of the game. This method checks the GameScreen.IsActive
+        /// property, so the game will stop updating when the pause menu is active,
+        /// or if you tab away to a different application.
+        /// </summary>
+        public override void Update(GameTime gameTime, bool otherScreenHasFocus,
+                                                       bool coveredByOtherScreen)
+        {
+            base.Update(gameTime, otherScreenHasFocus, false);
+
+            // Gradually fade in or out depending on whether we are covered by the pause screen.
+            if (coveredByOtherScreen)
+                pauseAlpha = Math.Min(pauseAlpha + 1f / 32, 1);
+            else
+                pauseAlpha = Math.Max(pauseAlpha - 1f / 32, 0);
+
+            if (IsActive)
+            {
+                // Apply some random jitter to make the enemy move around.
+                const float randomization = 10;
+
+                enemyPosition.X += (float)(random.NextDouble() - 0.5) * randomization;
+                enemyPosition.Y += (float)(random.NextDouble() - 0.5) * randomization;
+
+                // Apply a stabilizing force to stop the enemy moving off the screen.
+                Vector2 targetPosition = new Vector2(
+                    ScreenManager.GraphicsDevice.Viewport.Width / 2 - gameFont.MeasureString("Insert Gameplay Here").X / 2, 
+                    200);
+
+                enemyPosition = Vector2.Lerp(enemyPosition, targetPosition, 0.05f);
+
+                // TODO: this game isn't very fun! You could probably improve
+                // it by inserting something more interesting in this space :-)
+            }
+        }
+
+
+        /// <summary>
+        /// Lets the game respond to player input. Unlike the Update method,
+        /// this will only be called when the gameplay screen is active.
+        /// </summary>
+        public override void HandleInput(GameTime gameTime, InputState input)
+        {
+            if (input == null)
+                throw new ArgumentNullException("input");
+
+            // Look up inputs for the active player profile.
+            int playerIndex = (int)ControllingPlayer.Value;
+
+            KeyboardState keyboardState = input.CurrentKeyboardStates[playerIndex];
+            GamePadState gamePadState = input.CurrentGamePadStates[playerIndex];
+
+            // The game pauses either if the user presses the pause button, or if
+            // they unplug the active gamepad. This requires us to keep track of
+            // whether a gamepad was ever plugged in, because we don't want to pause
+            // on PC if they are playing with a keyboard and have no gamepad at all!
+            bool gamePadDisconnected = !gamePadState.IsConnected &&
+                                       input.GamePadWasConnected[playerIndex];
+
+            PlayerIndex player;
+            if (pauseAction.Evaluate(input, ControllingPlayer, out player) || gamePadDisconnected)
+            {
+#if WINDOWS_PHONE
+                ScreenManager.AddScreen(new PhonePauseScreen(), ControllingPlayer);
+#else
+                ScreenManager.AddScreen(new PauseMenuScreen(), ControllingPlayer);
+#endif
+            }
+            else
+            {
+                // Otherwise move the player position.
+                Vector2 movement = Vector2.Zero;
+
+                if (keyboardState.IsKeyDown(Keys.Left))
+                    movement.X--;
+
+                if (keyboardState.IsKeyDown(Keys.Right))
+                    movement.X++;
+
+                if (keyboardState.IsKeyDown(Keys.Up))
+                    movement.Y--;
+
+                if (keyboardState.IsKeyDown(Keys.Down))
+                    movement.Y++;
+
+                Vector2 thumbstick = gamePadState.ThumbSticks.Left;
+
+                movement.X += thumbstick.X;
+                movement.Y -= thumbstick.Y;
+
+                if (input.TouchState.Count > 0)
+                {
+                    Vector2 touchPosition = input.TouchState[0].Position;
+                    Vector2 direction = touchPosition - playerPosition;
+                    direction.Normalize();
+                    movement += direction;
+                }
+
+                if (movement.Length() > 1)
+                    movement.Normalize();
+
+                playerPosition += movement * 8f;
+            }
+        }
+
+
+        /// <summary>
+        /// Draws the gameplay screen.
+        /// </summary>
+        public override void Draw(GameTime gameTime)
+        {
+            // This game has a blue background. Why? Because!
+            ScreenManager.GraphicsDevice.Clear(ClearOptions.Target,
+                                               Color.CornflowerBlue, 0, 0);
+
+            // Our player and enemy are both actually just text strings.
+            SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
+
+            spriteBatch.Begin();
+
+            spriteBatch.DrawString(gameFont, "// TODO", playerPosition, Color.Green);
+
+            spriteBatch.DrawString(gameFont, "Insert Gameplay Here",
+                                   enemyPosition, Color.DarkRed);
+
+            spriteBatch.End();
+
+            // If the game is transitioning on or off, fade it out to black.
+            if (TransitionPosition > 0 || pauseAlpha > 0)
+            {
+                float alpha = MathHelper.Lerp(1f - TransitionAlpha, 1f, pauseAlpha / 2);
+
+                ScreenManager.FadeBackBufferToBlack(alpha);
+            }
+        }
+
+
+        #endregion
+    }
+}

axios/ScreenSystem/IScreenFactory.cs

@@ -0,0 +1,49 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// IScreenFactory.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+using System;
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// Defines an object that can create a screen when given its type.
+    /// 
+    /// The ScreenManager attempts to handle tombstoning on Windows Phone by creating an XML
+    /// document that has a list of the screens currently in the manager. When the game is
+    /// reactivated, the ScreenManager needs to create instances of those screens. However
+    /// since there is no restriction that a particular GameScreen subclass has a parameterless
+    /// constructor, there is no way the ScreenManager alone could create those instances.
+    /// 
+    /// IScreenFactory fills this gap by providing an interface the game should implement to
+    /// act as a translation from type to instance. The ScreenManager locates the IScreenFactory
+    /// from the Game.Services collection and passes each screen type to the factory, expecting
+    /// to get the correct GameScreen out.
+    /// 
+    /// If your game screens all have parameterless constructors, the minimal implementation of
+    /// this interface would look like this:
+    /// 
+    /// return Activator.CreateInstance(screenType) as GameScreen;
+    /// 
+    /// If you have screens with constructors that take arguments, you will need to ensure that
+    /// you can read these arguments from storage or generate new ones, then construct the screen
+    /// based on the type.
+    /// 
+    /// The ScreenFactory type in the sample game has the minimal implementation along with some
+    /// extra comments showing a potentially more complex example of how to implement IScreenFactory.
+    /// </summary>
+    public interface IScreenFactory
+    {
+        /// <summary>
+        /// Creates a GameScreen from the given type.
+        /// </summary>
+        /// <param name="screenType">The type of screen to create.</param>
+        /// <returns>The newly created screen.</returns>
+        GameScreen CreateScreen(Type screenType);
+    }
+}

axios/ScreenSystem/InputAction.cs

@@ -0,0 +1,96 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// InputAction.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Input;
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// Defines an action that is designated by some set of buttons and/or keys.
+    /// 
+    /// The way actions work is that you define a set of buttons and keys that trigger the action. You can
+    /// then evaluate the action against an InputState which will test to see if any of the buttons or keys
+    /// are pressed by a player. You can also set a flag that indicates if the action only occurs once when
+    /// the buttons/keys are first pressed or whether the action should occur each frame.
+    /// 
+    /// Using this InputAction class means that you can configure new actions based on keys and buttons
+    /// without having to directly modify the InputState type. This means more customization by your games
+    /// without having to change the core classes of Game State Management.
+    /// </summary>
+    public class InputAction
+    {
+        private readonly Buttons[] buttons;
+        private readonly Keys[] keys;
+        private readonly bool newPressOnly;
+
+        // These delegate types map to the methods on InputState. We use these to simplify the evalute method
+        // by allowing us to map the appropriate delegates and invoke them, rather than having two separate code paths.
+        private delegate bool ButtonPress(Buttons button, PlayerIndex? controllingPlayer, out PlayerIndex player);
+        private delegate bool KeyPress(Keys key, PlayerIndex? controllingPlayer, out PlayerIndex player);
+
+        /// <summary>
+        /// Initializes a new InputAction.
+        /// </summary>
+        /// <param name="buttons">An array of buttons that can trigger the action.</param>
+        /// <param name="keys">An array of keys that can trigger the action.</param>
+        /// <param name="newPressOnly">Whether the action only occurs on the first press of one of the buttons/keys, 
+        /// false if it occurs each frame one of the buttons/keys is down.</param>
+        public InputAction(Buttons[] buttons, Keys[] keys, bool newPressOnly)
+        {
+            // Store the buttons and keys. If the arrays are null, we create a 0 length array so we don't
+            // have to do null checks in the Evaluate method
+            this.buttons = buttons != null ? buttons.Clone() as Buttons[] : new Buttons[0];
+            this.keys = keys != null ? keys.Clone() as Keys[] : new Keys[0];
+
+            this.newPressOnly = newPressOnly;
+        }
+
+        /// <summary>
+        /// Evaluates the action against a given InputState.
+        /// </summary>
+        /// <param name="state">The InputState to test for the action.</param>
+        /// <param name="controllingPlayer">The player to test, or null to allow any player.</param>
+        /// <param name="player">If controllingPlayer is null, this is the player that performed the action.</param>
+        /// <returns>True if the action occurred, false otherwise.</returns>
+        public bool Evaluate(InputState state, PlayerIndex? controllingPlayer, out PlayerIndex player)
+        {
+            // Figure out which delegate methods to map from the state which takes care of our "newPressOnly" logic
+            ButtonPress buttonTest;
+            KeyPress keyTest;
+            if (newPressOnly)
+            {
+                buttonTest = state.IsNewButtonPress;
+                keyTest = state.IsNewKeyPress;
+            }
+            else
+            {
+                buttonTest = state.IsButtonPressed;
+                keyTest = state.IsKeyPressed;
+            }
+
+            // Now we simply need to invoke the appropriate methods for each button and key in our collections
+            foreach (Buttons button in buttons)
+            {
+                if (buttonTest(button, controllingPlayer, out player))
+                    return true;
+            }
+            foreach (Keys key in keys)
+            {
+                if (keyTest(key, controllingPlayer, out player))
+                    return true;
+            }
+
+            // If we got here, the action is not matched
+            player = PlayerIndex.One;
+            return false;
+        }
+    }
+}

axios/ScreenSystem/InputHelper.cs

@@ -1,10 +1,13 @@
 using System.Collections.Generic;
 using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
 using Microsoft.Xna.Framework.Input;
 using Microsoft.Xna.Framework.Input.Touch;
+using FarseerPhysics.SamplesFramework;
+using GameStateManagement;
 
-namespace FarseerPhysics.SamplesFramework
+namespace FarseerPhysics.SamplesFramework2
 {
     /// <summary>
     ///   an enum of all available mouse buttons.
@@ -145,13 +148,14 @@ namespace FarseerPhysics.SamplesFramework
 
         public void LoadContent()
         {
-            _cursorSprite = new Sprite(_manager.Content.Load<Texture2D>("Common/cursor"));
+            
+            _cursorSprite = new Sprite(_manager.Game.Content.Load<Texture2D>("Common/cursor"));
 #if WINDOWS_PHONE
             // virtual stick content
-            _phoneStick = new VirtualStick(_manager.Content.Load<Texture2D>("Common/socket"),
+            _phoneStick = new VirtualStick(_manager.Game.Content.Load<Texture2D>("Common/socket"),
-                                           _manager.Content.Load<Texture2D>("Common/stick"), new Vector2(80f, 400f));
+                                           _manager.Game.Content.Load<Texture2D>("Common/stick"), new Vector2(80f, 400f));
 
-            Texture2D temp = _manager.Content.Load<Texture2D>("Common/buttons");
+            Texture2D temp = _manager.Game.Content.Load<Texture2D>("Common/buttons");
             _phoneA = new VirtualButton(temp, new Vector2(695f, 380f), new Rectangle(0, 0, 40, 40), new Rectangle(0, 40, 40, 40));
             _phoneB = new VirtualButton(temp, new Vector2(745f, 360f), new Rectangle(40, 0, 40, 40), new Rectangle(40, 40, 40, 40));
 #endif

axios/ScreenSystem/InputState.cs

@@ -0,0 +1,609 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// InputState.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
+using Microsoft.Xna.Framework.Input;
+using Microsoft.Xna.Framework.Input.Touch;
+using FarseerPhysics.SamplesFramework;
+using Microsoft.Xna.Framework.Graphics;
+using System;
+
+namespace GameStateManagement
+{
+
+    /// <summary>
+    ///   an enum of all available mouse buttons.
+    /// </summary>
+    public enum MouseButtons
+    {
+        LeftButton,
+        MiddleButton,
+        RightButton,
+        ExtraButton1,
+        ExtraButton2
+    }
+
+    /// <summary>
+    /// Helper for reading input from keyboard, gamepad, and touch input. This class 
+    /// tracks both the current and previous state of the input devices, and implements 
+    /// query methods for high level input actions such as "move up through the menu"
+    /// or "pause the game".
+    /// </summary>
+    public class InputState
+    {
+        public const int MaxInputs = 4;
+
+        public readonly KeyboardState[] CurrentKeyboardStates;
+        public readonly GamePadState[] CurrentGamePadStates;
+
+        public readonly KeyboardState[] LastKeyboardStates;
+        public readonly GamePadState[] LastGamePadStates;
+
+        public readonly bool[] GamePadWasConnected;
+
+        /*
+         * Needed for virtual stick on WP7
+         *  -- Nathan Adams [adamsna@datanethost.net] - 4/12/2012
+         */
+        private GamePadState _currentVirtualState;
+        private GamePadState _lastVirtualState;
+        private bool _handleVirtualStick;
+        /*
+         * I didn't create an array for the virtual stick because there will only be one
+         *  -- Nathan Adams [adamsna@datanethost.net] - 4/12/2012
+         */
+
+
+        /*
+         * Adding variables for the cursor 
+         *  -- Nathan Adams [adamsna@datanethost.net] - 4/15/2012
+         * 
+         */
+        private MouseState _currentMouseState;
+        private MouseState _lastMouseState;
+        
+        private Vector2 _cursor;
+        private bool _cursorIsValid;
+        private bool _cursorIsVisible;
+        private bool _cursorMoved;
+        private Sprite _cursorSprite;
+
+#if WINDOWS_PHONE
+        private VirtualStick _phoneStick;
+        private VirtualButton _phoneA;
+        private VirtualButton _phoneB;
+#endif
+
+        public TouchCollection TouchState;
+
+        public readonly List<GestureSample> Gestures = new List<GestureSample>();
+
+        private ScreenManager _manager;
+        private Viewport _viewport;
+        
+
+        /// <summary>
+        /// Constructs a new input state.
+        /// </summary>
+        public InputState(ScreenManager manager)
+        {
+            _manager = manager;
+            CurrentKeyboardStates = new KeyboardState[MaxInputs];
+            CurrentGamePadStates = new GamePadState[MaxInputs];
+
+            LastKeyboardStates = new KeyboardState[MaxInputs];
+            LastGamePadStates = new GamePadState[MaxInputs];
+
+            GamePadWasConnected = new bool[MaxInputs];
+            _currentVirtualState = new GamePadState();
+            _lastVirtualState = new GamePadState();
+
+            _cursorIsVisible = false;
+            _cursorMoved = false;
+#if WINDOWS_PHONE
+            _cursorIsValid = false;
+#else
+            _cursorIsValid = true;
+#endif
+            _cursor = Vector2.Zero;
+
+            _handleVirtualStick = false;
+        }
+
+        public MouseState MouseState
+        {
+            get { return _currentMouseState; }
+        }
+
+        public GamePadState VirtualState
+        {
+            get { return _currentVirtualState; }
+        }
+
+        public MouseState PreviousMouseState
+        {
+            get { return _lastMouseState; }
+        }
+
+        public GamePadState PreviousVirtualState
+        {
+            get { return _lastVirtualState; }
+        }
+
+        public bool ShowCursor
+        {
+            get { return _cursorIsVisible && _cursorIsValid; }
+            set { _cursorIsVisible = value; }
+        }
+
+        public bool EnableVirtualStick
+        {
+            get { return _handleVirtualStick; }
+            set { _handleVirtualStick = value; }
+        }
+
+        public Vector2 Cursor
+        {
+            get { return _cursor; }
+        }
+
+        public bool IsCursorMoved
+        {
+            get { return _cursorMoved; }
+        }
+
+        public bool IsCursorValid
+        {
+            get { return _cursorIsValid; }
+        }
+
+        public void LoadContent()
+        {
+            ContentManager man = new ContentManager(_manager.Game.Services, "Content");
+            _cursorSprite = new Sprite(man.Load<Texture2D>("Common/cursor"));
+#if WINDOWS_PHONE
+            // virtual stick content
+            _phoneStick = new VirtualStick(man.Load<Texture2D>("Common/socket"),
+                                           man.Load<Texture2D>("Common/stick"), new Vector2(80f, 400f));
+
+            Texture2D temp = man.Load<Texture2D>("Common/buttons");
+            _phoneA = new VirtualButton(temp, new Vector2(695f, 380f), new Rectangle(0, 0, 40, 40), new Rectangle(0, 40, 40, 40));
+            _phoneB = new VirtualButton(temp, new Vector2(745f, 360f), new Rectangle(40, 0, 40, 40), new Rectangle(40, 40, 40, 40));
+#endif
+            _viewport = _manager.GraphicsDevice.Viewport;
+        }
+
+        private GamePadState HandleVirtualStickWin()
+        {
+            Vector2 _leftStick = Vector2.Zero;
+            List<Buttons> _buttons = new List<Buttons>();
+            PlayerIndex pout;
+            if (IsNewKeyPress(Keys.A, PlayerIndex.One, out pout))
+            {
+                _leftStick.X -= 1f;
+            }
+            if (IsNewKeyPress(Keys.S, PlayerIndex.One, out pout))
+            {
+                _leftStick.Y -= 1f;
+            }
+            if (IsNewKeyPress(Keys.D, PlayerIndex.One, out pout))
+            {
+                _leftStick.X += 1f;
+            }
+            if (IsNewKeyPress(Keys.W, PlayerIndex.One, out pout))
+            {
+                _leftStick.Y += 1f;
+            }
+            if (IsNewKeyPress(Keys.Space, PlayerIndex.One, out pout))
+            {
+                _buttons.Add(Buttons.A);
+            }
+            if (IsNewKeyPress(Keys.LeftControl, PlayerIndex.One, out pout))
+            {
+                _buttons.Add(Buttons.B);
+            }
+            if (_leftStick != Vector2.Zero)
+            {
+                _leftStick.Normalize();
+            }
+
+            return new GamePadState(_leftStick, Vector2.Zero, 0f, 0f, _buttons.ToArray());
+        }
+
+        private GamePadState HandleVirtualStickWP7()
+        {
+            List<Buttons> _buttons = new List<Buttons>();
+            Vector2 _stick = Vector2.Zero;
+#if WINDOWS_PHONE
+            _phoneA.Pressed = false;
+            _phoneB.Pressed = false;
+            TouchCollection touchLocations = TouchPanel.GetState();
+            foreach (TouchLocation touchLocation in touchLocations)
+            {
+                _phoneA.Update(touchLocation);
+                _phoneB.Update(touchLocation);
+                _phoneStick.Update(touchLocation);
+            }
+            if (_phoneA.Pressed)
+            {
+                _buttons.Add(Buttons.A);
+            }
+            if (_phoneB.Pressed)
+            {
+                _buttons.Add(Buttons.B);
+            }
+            _stick = _phoneStick.StickPosition;
+#endif
+            return new GamePadState(_stick, Vector2.Zero, 0f, 0f, _buttons.ToArray());
+        }
+
+        public void Draw()
+        {
+            if (_cursorIsVisible && _cursorIsValid)
+            {
+                _manager.SpriteBatch.Begin();
+                _manager.SpriteBatch.Draw(_cursorSprite.Texture, _cursor, null, Color.White, 0f, _cursorSprite.Origin, 1f, SpriteEffects.None, 0f);
+                _manager.SpriteBatch.End();
+            }
+#if WINDOWS_PHONE
+            if (_handleVirtualStick)
+            {
+                _manager.SpriteBatch.Begin();
+                _phoneA.Draw(_manager.SpriteBatch);
+                _phoneB.Draw(_manager.SpriteBatch);
+                _phoneStick.Draw(_manager.SpriteBatch);
+                _manager.SpriteBatch.End();
+            }
+#endif
+        }
+
+        /// <summary>
+        /// Reads the latest state user input.
+        /// </summary>
+        public void Update(GameTime gameTime)
+        {
+            PlayerIndex p;
+            _lastMouseState = _currentMouseState;
+            if (_handleVirtualStick)
+            {
+                _lastVirtualState = _currentVirtualState;
+            }
+
+            _currentMouseState = Mouse.GetState();
+
+            if (_handleVirtualStick)
+            {
+#if XBOX
+            _currentVirtualState= GamePad.GetState(PlayerIndex.One);
+#elif WINDOWS
+                if (GamePad.GetState(PlayerIndex.One).IsConnected)
+                {
+                    _currentVirtualState = GamePad.GetState(PlayerIndex.One);
+                }
+                else
+                {
+                    _currentVirtualState = HandleVirtualStickWin();
+                }
+#elif WINDOWS_PHONE
+                _currentVirtualState = HandleVirtualStickWP7();
+#endif
+            }
+            for (int i = 0; i < MaxInputs; i++)
+            {
+                LastKeyboardStates[i] = CurrentKeyboardStates[i];
+                LastGamePadStates[i] = CurrentGamePadStates[i];
+
+                CurrentKeyboardStates[i] = Keyboard.GetState((PlayerIndex)i);
+                CurrentGamePadStates[i] = GamePad.GetState((PlayerIndex)i);
+
+                // Keep track of whether a gamepad has ever been
+                // connected, so we can detect if it is unplugged.
+                if (CurrentGamePadStates[i].IsConnected)
+                {
+                    GamePadWasConnected[i] = true;
+                }
+            }
+
+            // Get the raw touch state from the TouchPanel
+            TouchState = TouchPanel.GetState();
+
+            // Read in any detected gestures into our list for the screens to later process
+            Gestures.Clear();
+            while (TouchPanel.IsGestureAvailable)
+            {
+                //System.Diagnostics.Debugger.Break();
+                Gestures.Add(TouchPanel.ReadGesture());
+            }
+            //System.Diagnostics.Debugger.Break();
+
+            // Update cursor
+            Vector2 oldCursor = _cursor;
+
+            if (CurrentGamePadStates[0].IsConnected && CurrentGamePadStates[0].ThumbSticks.Left != Vector2.Zero)
+            {
+                Vector2 temp = CurrentGamePadStates[0].ThumbSticks.Left;
+                _cursor += temp * new Vector2(300f, -300f) * (float)gameTime.ElapsedGameTime.TotalSeconds;
+                Mouse.SetPosition((int)_cursor.X, (int)_cursor.Y);
+            }
+            else
+            {
+                _cursor.X = _currentMouseState.X;
+                _cursor.Y = _currentMouseState.Y;
+            }
+
+            if (this.IsNewKeyPress(Keys.P, PlayerIndex.One, out p))
+                Console.WriteLine(_cursor.ToString());
+
+            _cursor.X = MathHelper.Clamp(_cursor.X, 0f, _viewport.Width);
+            _cursor.Y = MathHelper.Clamp(_cursor.Y, 0f, _viewport.Height);
+
+            if (this.IsNewKeyPress(Keys.P, PlayerIndex.One, out p))
+                Console.WriteLine(_cursor.ToString());
+
+            if (_cursorIsValid && oldCursor != _cursor)
+            {
+                _cursorMoved = true;
+            }
+            else
+            {
+                _cursorMoved = false;
+            }
+
+#if WINDOWS
+            if (_viewport.Bounds.Contains(_currentMouseState.X, _currentMouseState.Y))
+            {
+                _cursorIsValid = true;
+            }
+            else
+            {
+                _cursorIsValid = false;
+            }
+#elif WINDOWS_PHONE
+            if (_currentMouseState.LeftButton == ButtonState.Pressed)
+            {
+                _cursorIsValid = true;
+            }
+            else
+            {
+                _cursorIsValid = false;
+            }
+#endif
+            
+            if (this.IsNewKeyPress(Keys.P, PlayerIndex.One, out p))
+                Console.WriteLine(_viewport.ToString());
+        }
+
+
+        /// <summary>
+        /// Helper for checking if a key was pressed during this update. The
+        /// controllingPlayer parameter specifies which player to read input for.
+        /// If this is null, it will accept input from any player. When a keypress
+        /// is detected, the output playerIndex reports which player pressed it.
+        /// </summary>
+        public bool IsKeyPressed(Keys key, PlayerIndex? controllingPlayer, out PlayerIndex playerIndex)
+        {
+            if (controllingPlayer.HasValue)
+            {
+                // Read input from the specified player.
+                playerIndex = controllingPlayer.Value;
+
+                int i = (int)playerIndex;
+
+                return CurrentKeyboardStates[i].IsKeyDown(key);
+            }
+            else
+            {
+                // Accept input from any player.
+                return (IsKeyPressed(key, PlayerIndex.One, out playerIndex) ||
+                        IsKeyPressed(key, PlayerIndex.Two, out playerIndex) ||
+                        IsKeyPressed(key, PlayerIndex.Three, out playerIndex) ||
+                        IsKeyPressed(key, PlayerIndex.Four, out playerIndex));
+            }
+        }
+
+
+        /// <summary>
+        /// Helper for checking if a button was pressed during this update.
+        /// The controllingPlayer parameter specifies which player to read input for.
+        /// If this is null, it will accept input from any player. When a button press
+        /// is detected, the output playerIndex reports which player pressed it.
+        /// </summary>
+        public bool IsButtonPressed(Buttons button, PlayerIndex? controllingPlayer, out PlayerIndex playerIndex)
+        {
+            if (controllingPlayer.HasValue)
+            {
+                // Read input from the specified player.
+                playerIndex = controllingPlayer.Value;
+
+                int i = (int)playerIndex;
+
+                return CurrentGamePadStates[i].IsButtonDown(button);
+            }
+            else
+            {
+                // Accept input from any player.
+                return (IsButtonPressed(button, PlayerIndex.One, out playerIndex) ||
+                        IsButtonPressed(button, PlayerIndex.Two, out playerIndex) ||
+                        IsButtonPressed(button, PlayerIndex.Three, out playerIndex) ||
+                        IsButtonPressed(button, PlayerIndex.Four, out playerIndex));
+            }
+        }
+
+
+        /// <summary>
+        /// Helper for checking if a key was newly pressed during this update. The
+        /// controllingPlayer parameter specifies which player to read input for.
+        /// If this is null, it will accept input from any player. When a keypress
+        /// is detected, the output playerIndex reports which player pressed it.
+        /// </summary>
+        public bool IsNewKeyPress(Keys key, PlayerIndex? controllingPlayer, out PlayerIndex playerIndex)
+        {
+            if (controllingPlayer.HasValue)
+            {
+                // Read input from the specified player.
+                playerIndex = controllingPlayer.Value;
+
+                int i = (int)playerIndex;
+
+                return (CurrentKeyboardStates[i].IsKeyDown(key) &&
+                        LastKeyboardStates[i].IsKeyUp(key));
+            }
+            else
+            {
+                // Accept input from any player.
+                return (IsNewKeyPress(key, PlayerIndex.One, out playerIndex) ||
+                        IsNewKeyPress(key, PlayerIndex.Two, out playerIndex) ||
+                        IsNewKeyPress(key, PlayerIndex.Three, out playerIndex) ||
+                        IsNewKeyPress(key, PlayerIndex.Four, out playerIndex));
+            }
+        }
+
+        public bool IsNewKeyRelease(Keys key, PlayerIndex? controllingPlayer, out PlayerIndex playerIndex)
+        {
+            if (controllingPlayer.HasValue)
+            {
+                // Read input from the specified player.
+                playerIndex = controllingPlayer.Value;
+
+                int i = (int)playerIndex;
+
+                return (CurrentKeyboardStates[i].IsKeyUp(key) &&
+                        LastKeyboardStates[i].IsKeyDown(key));
+            }
+            else
+            {
+                // Accept input from any player.
+                return (IsNewKeyRelease(key, PlayerIndex.One, out playerIndex) ||
+                        IsNewKeyRelease(key, PlayerIndex.Two, out playerIndex) ||
+                        IsNewKeyRelease(key, PlayerIndex.Three, out playerIndex) ||
+                        IsNewKeyRelease(key, PlayerIndex.Four, out playerIndex));
+            }
+        }
+
+
+        /// <summary>
+        /// Helper for checking if a button was newly pressed during this update.
+        /// The controllingPlayer parameter specifies which player to read input for.
+        /// If this is null, it will accept input from any player. When a button press
+        /// is detected, the output playerIndex reports which player pressed it.
+        /// </summary>
+        public bool IsNewButtonPress(Buttons button, PlayerIndex? controllingPlayer, out PlayerIndex playerIndex)
+        {
+            if (controllingPlayer.HasValue)
+            {
+                // Read input from the specified player.
+                playerIndex = controllingPlayer.Value;
+
+                int i = (int)playerIndex;
+
+                return (CurrentGamePadStates[i].IsButtonDown(button) &&
+                        LastGamePadStates[i].IsButtonUp(button));
+            }
+            else
+            {
+                // Accept input from any player.
+                return (IsNewButtonPress(button, PlayerIndex.One, out playerIndex) ||
+                        IsNewButtonPress(button, PlayerIndex.Two, out playerIndex) ||
+                        IsNewButtonPress(button, PlayerIndex.Three, out playerIndex) ||
+                        IsNewButtonPress(button, PlayerIndex.Four, out playerIndex));
+            }
+        }
+
+        public bool IsNewButtonRelease(Buttons button, PlayerIndex? controllingPlayer, out PlayerIndex playerIndex)
+        {
+            if (controllingPlayer.HasValue)
+            {
+                // Read input from the specified player.
+                playerIndex = controllingPlayer.Value;
+
+                int i = (int)playerIndex;
+
+                return (CurrentGamePadStates[i].IsButtonUp(button) &&
+                        LastGamePadStates[i].IsButtonDown(button));
+            }
+            else
+            {
+                // Accept input from any player.
+                return (IsNewButtonRelease(button, PlayerIndex.One, out playerIndex) ||
+                        IsNewButtonRelease(button, PlayerIndex.Two, out playerIndex) ||
+                        IsNewButtonRelease(button, PlayerIndex.Three, out playerIndex) ||
+                        IsNewButtonRelease(button, PlayerIndex.Four, out playerIndex));
+            }
+        }
+
+        public bool IsNewVirtualButtonPress(Buttons button)
+        {
+            return (_lastVirtualState.IsButtonUp(button) &&
+                    _currentVirtualState.IsButtonDown(button));
+        }
+
+        public bool IsNewVirtualButtonRelease(Buttons button)
+        {
+            return (_lastVirtualState.IsButtonDown(button) &&
+                    _currentVirtualState.IsButtonUp(button));
+        }
+
+        /// <summary>
+        ///   Helper for checking if a mouse button was newly pressed during this update.
+        /// </summary>
+        public bool IsNewMouseButtonPress(MouseButtons button)
+        {
+            switch (button)
+            {
+                case MouseButtons.LeftButton:
+                    return (_currentMouseState.LeftButton == ButtonState.Pressed &&
+                            _lastMouseState.LeftButton == ButtonState.Released);
+                case MouseButtons.RightButton:
+                    return (_currentMouseState.RightButton == ButtonState.Pressed &&
+                            _lastMouseState.RightButton == ButtonState.Released);
+                case MouseButtons.MiddleButton:
+                    return (_currentMouseState.MiddleButton == ButtonState.Pressed &&
+                            _lastMouseState.MiddleButton == ButtonState.Released);
+                case MouseButtons.ExtraButton1:
+                    return (_currentMouseState.XButton1 == ButtonState.Pressed &&
+                            _lastMouseState.XButton1 == ButtonState.Released);
+                case MouseButtons.ExtraButton2:
+                    return (_currentMouseState.XButton2 == ButtonState.Pressed &&
+                            _lastMouseState.XButton2 == ButtonState.Released);
+                default:
+                    return false;
+            }
+        }
+
+        /// <summary>
+        /// Checks if the requested mouse button is released.
+        /// </summary>
+        /// <param name="button">The button.</param>
+        public bool IsNewMouseButtonRelease(MouseButtons button)
+        {
+            switch (button)
+            {
+                case MouseButtons.LeftButton:
+                    return (_lastMouseState.LeftButton == ButtonState.Pressed &&
+                            _currentMouseState.LeftButton == ButtonState.Released);
+                case MouseButtons.RightButton:
+                    return (_lastMouseState.RightButton == ButtonState.Pressed &&
+                            _currentMouseState.RightButton == ButtonState.Released);
+                case MouseButtons.MiddleButton:
+                    return (_lastMouseState.MiddleButton == ButtonState.Pressed &&
+                            _currentMouseState.MiddleButton == ButtonState.Released);
+                case MouseButtons.ExtraButton1:
+                    return (_lastMouseState.XButton1 == ButtonState.Pressed &&
+                            _currentMouseState.XButton1 == ButtonState.Released);
+                case MouseButtons.ExtraButton2:
+                    return (_lastMouseState.XButton2 == ButtonState.Pressed &&
+                            _currentMouseState.XButton2 == ButtonState.Released);
+                default:
+                    return false;
+            }
+        }
+    }
+}

axios/ScreenSystem/LoadingScreen.cs

@@ -0,0 +1,163 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// LoadingScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using GameStateManagement;
+#endregion
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// The loading screen coordinates transitions between the menu system and the
+    /// game itself. Normally one screen will transition off at the same time as
+    /// the next screen is transitioning on, but for larger transitions that can
+    /// take a longer time to load their data, we want the menu system to be entirely
+    /// gone before we start loading the game. This is done as follows:
+    /// 
+    /// - Tell all the existing screens to transition off.
+    /// - Activate a loading screen, which will transition on at the same time.
+    /// - The loading screen watches the state of the previous screens.
+    /// - When it sees they have finished transitioning off, it activates the real
+    ///   next screen, which may take a long time to load its data. The loading
+    ///   screen will be the only thing displayed while this load is taking place.
+    /// </summary>
+    class LoadingScreen : GameScreen
+    {
+        #region Fields
+
+        bool loadingIsSlow;
+        bool otherScreensAreGone;
+
+        GameScreen[] screensToLoad;
+
+        #endregion
+
+        #region Initialization
+
+
+        /// <summary>
+        /// The constructor is private: loading screens should
+        /// be activated via the static Load method instead.
+        /// </summary>
+        private LoadingScreen(ScreenManager screenManager, bool loadingIsSlow,
+                              GameScreen[] screensToLoad)
+        {
+            this.loadingIsSlow = loadingIsSlow;
+            this.screensToLoad = screensToLoad;
+
+            TransitionOnTime = TimeSpan.FromSeconds(0.5);
+        }
+
+
+        /// <summary>
+        /// Activates the loading screen.
+        /// </summary>
+        public static void Load(ScreenManager screenManager, bool loadingIsSlow,
+                                PlayerIndex? controllingPlayer,
+                                params GameScreen[] screensToLoad)
+        {
+            // Tell all the current screens to transition off.
+            foreach (GameScreen screen in screenManager.GetScreens())
+                screen.ExitScreen();
+
+            // Create and activate the loading screen.
+            LoadingScreen loadingScreen = new LoadingScreen(screenManager,
+                                                            loadingIsSlow,
+                                                            screensToLoad);
+
+            screenManager.AddScreen(loadingScreen, controllingPlayer);
+        }
+
+
+        #endregion
+
+        #region Update and Draw
+
+
+        /// <summary>
+        /// Updates the loading screen.
+        /// </summary>
+        public override void Update(GameTime gameTime, bool otherScreenHasFocus,
+                                                       bool coveredByOtherScreen)
+        {
+            base.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
+
+            // If all the previous screens have finished transitioning
+            // off, it is time to actually perform the load.
+            if (otherScreensAreGone)
+            {
+                ScreenManager.RemoveScreen(this);
+
+                foreach (GameScreen screen in screensToLoad)
+                {
+                    if (screen != null)
+                    {
+                        ScreenManager.AddScreen(screen, ControllingPlayer);
+                    }
+                }
+
+                // Once the load has finished, we use ResetElapsedTime to tell
+                // the  game timing mechanism that we have just finished a very
+                // long frame, and that it should not try to catch up.
+                ScreenManager.Game.ResetElapsedTime();
+            }
+        }
+
+
+        /// <summary>
+        /// Draws the loading screen.
+        /// </summary>
+        public override void Draw(GameTime gameTime)
+        {
+            // If we are the only active screen, that means all the previous screens
+            // must have finished transitioning off. We check for this in the Draw
+            // method, rather than in Update, because it isn't enough just for the
+            // screens to be gone: in order for the transition to look good we must
+            // have actually drawn a frame without them before we perform the load.
+            if ((ScreenState == ScreenState.Active) &&
+                (ScreenManager.GetScreens().Length == 1))
+            {
+                otherScreensAreGone = true;
+            }
+
+            // The gameplay screen takes a while to load, so we display a loading
+            // message while that is going on, but the menus load very quickly, and
+            // it would look silly if we flashed this up for just a fraction of a
+            // second while returning from the game to the menus. This parameter
+            // tells us how long the loading is going to take, so we know whether
+            // to bother drawing the message.
+            if (loadingIsSlow)
+            {
+                SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
+                SpriteFont font = ScreenManager.Font;
+
+                const string message = "Loading...";
+
+                // Center the text in the viewport.
+                Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
+                Vector2 viewportSize = new Vector2(viewport.Width, viewport.Height);
+                Vector2 textSize = font.MeasureString(message);
+                Vector2 textPosition = (viewportSize - textSize) / 2;
+
+                Color color = Color.White * TransitionAlpha;
+
+                // Draw the text.
+                spriteBatch.Begin();
+                spriteBatch.DrawString(font, message, textPosition, color);
+                spriteBatch.End();
+            }
+        }
+
+
+        #endregion
+    }
+}

axios/ScreenSystem/LogoScreen.cs

@@ -3,8 +3,9 @@ using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
 using Microsoft.Xna.Framework.Input;
+using FarseerPhysics.SamplesFramework;
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
     public class LogoScreen : GameScreen
     {
@@ -29,36 +30,40 @@ namespace FarseerPhysics.SamplesFramework
         /// used the shared ContentManager provided by the Game class, the content
         /// would remain loaded forever.
         /// </summary>
-        public override void LoadContent()
+        public override void Activate(bool instancePreserved)
         {
-            if (_content == null)
+            if (!instancePreserved)
             {
-                _content = new ContentManager(ScreenManager.Game.Services, "Content");
+                if (_content == null)
+                {
+                    _content = new ContentManager(ScreenManager.Game.Services, "Content");
+                }
+
+                _farseerLogoTexture = _content.Load<Texture2D>("Common/logo");
+
+                Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
+                int rectHeight = (int)(viewport.Height * LogoScreenHeightRatio);
+                int rectWidth = (int)(rectHeight * LogoWidthHeightRatio);
+                int posX = viewport.Bounds.Center.X - rectWidth / 2;
+                int posY = viewport.Bounds.Center.Y - rectHeight / 2;
+
+                _destination = new Rectangle(posX, posY, rectWidth, rectHeight);
             }
-
-            _farseerLogoTexture = _content.Load<Texture2D>("Common/logo");
-
-            Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
-            int rectHeight = (int)(viewport.Height * LogoScreenHeightRatio);
-            int rectWidth = (int)(rectHeight * LogoWidthHeightRatio);
-            int posX = viewport.Bounds.Center.X - rectWidth / 2;
-            int posY = viewport.Bounds.Center.Y - rectHeight / 2;
-
-            _destination = new Rectangle(posX, posY, rectWidth, rectHeight);
         }
 
         /// <summary>
         /// Unloads graphics content for this screen.
         /// </summary>
-        public override void UnloadContent()
+        public override void Unload()
         {
             _content.Unload();
         }
 
-        public override void HandleInput(InputHelper input, GameTime gameTime)
+        public override void HandleInput(GameTime gameTime, InputState input)
         {
-            if (input.KeyboardState.GetPressedKeys().Length > 0 ||
+            //input.
-                input.GamePadState.IsButtonDown(Buttons.A | Buttons.Start | Buttons.Back) ||
+            if (input.CurrentKeyboardStates[0].GetPressedKeys().Length > 0 ||
+                input.CurrentGamePadStates[0].IsButtonDown(Buttons.A | Buttons.Start | Buttons.Back) ||
                 input.MouseState.LeftButton == ButtonState.Pressed)
             {
                 _duration = TimeSpan.Zero;

axios/ScreenSystem/MainMenuScreen.cs

@@ -0,0 +1,99 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// MainMenuScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using Microsoft.Xna.Framework;
+using GameStateManagementSample;
+#endregion
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// The main menu screen is the first thing displayed when the game starts up.
+    /// </summary>
+    class MainMenuScreen : MenuScreen
+    {
+        #region Initialization
+
+
+        /// <summary>
+        /// Constructor fills in the menu contents.
+        /// </summary>
+        public MainMenuScreen()
+            : base("Main Menu")
+        {
+            // Create our menu entries.
+            MenuEntry playGameMenuEntry = new MenuEntry("Play Game");
+            MenuEntry optionsMenuEntry = new MenuEntry("Options");
+            MenuEntry exitMenuEntry = new MenuEntry("Exit");
+
+            // Hook up menu event handlers.
+            playGameMenuEntry.Selected += PlayGameMenuEntrySelected;
+            optionsMenuEntry.Selected += OptionsMenuEntrySelected;
+            exitMenuEntry.Selected += OnCancel;
+
+            // Add entries to the menu.
+            MenuEntries.Add(playGameMenuEntry);
+            MenuEntries.Add(optionsMenuEntry);
+            MenuEntries.Add(exitMenuEntry);
+        }
+
+
+        #endregion
+
+        #region Handle Input
+
+
+        /// <summary>
+        /// Event handler for when the Play Game menu entry is selected.
+        /// </summary>
+        void PlayGameMenuEntrySelected(object sender, PlayerIndexEventArgs e)
+        {
+            LoadingScreen.Load(ScreenManager, true, e.PlayerIndex,
+                               new GameplayScreen());
+        }
+
+
+        /// <summary>
+        /// Event handler for when the Options menu entry is selected.
+        /// </summary>
+        void OptionsMenuEntrySelected(object sender, PlayerIndexEventArgs e)
+        {
+            ScreenManager.AddScreen(new OptionsMenuScreen(), e.PlayerIndex);
+        }
+
+
+        /// <summary>
+        /// When the user cancels the main menu, ask if they want to exit the sample.
+        /// </summary>
+        protected override void OnCancel(PlayerIndex playerIndex)
+        {
+            const string message = "Are you sure you want to exit this sample?";
+
+            MessageBoxScreen confirmExitMessageBox = new MessageBoxScreen(message);
+
+            confirmExitMessageBox.Accepted += ConfirmExitMessageBoxAccepted;
+
+            ScreenManager.AddScreen(confirmExitMessageBox, playerIndex);
+        }
+
+
+        /// <summary>
+        /// Event handler for when the user selects ok on the "are you sure
+        /// you want to exit" message box.
+        /// </summary>
+        void ConfirmExitMessageBoxAccepted(object sender, PlayerIndexEventArgs e)
+        {
+            ScreenManager.Game.Exit();
+        }
+
+
+        #endregion
+    }
+}

axios/ScreenSystem/MenuButton.cs

@@ -2,7 +2,7 @@
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
     /// <summary>
     /// Helper class represents a single entry in a MenuScreen. By default this

axios/ScreenSystem/MenuEntry.cs

@@ -1,39 +1,35 @@
-using System;
+#region File Description
+//-----------------------------------------------------------------------------
+// MenuEntry.cs
+//
+// XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
+using GameStateManagement;
+#endregion
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
-    public enum EntryType
-    {
-        Screen,
-        Separator,
-        ExitItem,
-        BackItem
-    }
-
     /// <summary>
     /// Helper class represents a single entry in a MenuScreen. By default this
     /// just draws the entry text string, but it can be customized to display menu
     /// entries in different ways. This also provides an event that will be raised
     /// when the menu entry is selected.
     /// </summary>
-    public sealed class MenuEntry
+    public class MenuEntry
     {
-        private float _alpha;
+        #region Fields
-        private Vector2 _baseOrigin;
-
-        private float _height;
-        private MenuScreen _menu;
 
         /// <summary>
-        /// The position at which the entry is drawn. This is set by the MenuScreen
+        /// The text rendered for this entry.
-        /// each frame in Update.
         /// </summary>
-        private Vector2 _position;
+        string text;
-
-        private float _scale;
-        private GameScreen _screen;
 
         /// <summary>
         /// Tracks a fading selection effect on the entry.
@@ -41,28 +37,17 @@ namespace FarseerPhysics.SamplesFramework
         /// <remarks>
         /// The entries transition out of the selection effect when they are deselected.
         /// </remarks>
-        private float _selectionFade;
+        float selectionFade;
 
         /// <summary>
-        /// The text rendered for this entry.
+        /// The position at which the entry is drawn. This is set by the MenuScreen
+        /// each frame in Update.
         /// </summary>
-        private string _text;
+        Vector2 position;
 
-        private EntryType _type;
+        #endregion
-        private float _width;
 
-        /// <summary>
+        #region Properties
-        /// Constructs a new menu entry with the specified text.
-        /// </summary>
-        public MenuEntry(MenuScreen menu, string text, EntryType type, GameScreen screen)
-        {
-            _text = text;
-            _screen = screen;
-            _type = type;
-            _menu = menu;
-            _scale = 0.9f;
-            _alpha = 1.0f;
-        }
 
 
         /// <summary>
@@ -70,124 +55,138 @@ namespace FarseerPhysics.SamplesFramework
         /// </summary>
         public string Text
         {
-            get { return _text; }
+            get { return text; }
-            set { _text = value; }
+            set { text = value; }
         }
 
+
         /// <summary>
         /// Gets or sets the position at which to draw this menu entry.
         /// </summary>
         public Vector2 Position
         {
-            get { return _position; }
+            get { return position; }
-            set { _position = value; }
+            set { position = value; }
         }
 
-        public float Alpha
+
+        #endregion
+
+        #region Events
+
+
+        /// <summary>
+        /// Event raised when the menu entry is selected.
+        /// </summary>
+        public event EventHandler<PlayerIndexEventArgs> Selected;
+
+
+        /// <summary>
+        /// Method for raising the Selected event.
+        /// </summary>
+        protected internal virtual void OnSelectEntry(PlayerIndex playerIndex)
         {
-            get { return _alpha; }
+            if (Selected != null)
-            set { _alpha = value; }
+                Selected(this, new PlayerIndexEventArgs(playerIndex));
         }
 
-        public GameScreen Screen
+
+        #endregion
+
+        #region Initialization
+
+
+        /// <summary>
+        /// Constructs a new menu entry with the specified text.
+        /// </summary>
+        public MenuEntry(string text)
         {
-            get { return _screen; }
+            this.text = text;
         }
 
-        public void Initialize()
-        {
-            SpriteFont font = _menu.ScreenManager.Fonts.MenuSpriteFont;
 
-            _baseOrigin = new Vector2(font.MeasureString(Text).X, font.MeasureString("M").Y) * 0.5f;
+        #endregion
 
-            _width = font.MeasureString(Text).X * 0.8f;
+        #region Update and Draw
-            _height = font.MeasureString("M").Y * 0.8f;
-        }
 
-        public bool IsExitItem()
-        {
-            return _type == EntryType.ExitItem;
-        }
-
-        public bool IsSelectable()
-        {
-            return _type != EntryType.Separator;
-        }
-
-        public bool IsBackItem()
-        {
-            return _type == EntryType.BackItem;
-        }
 
         /// <summary>
         /// Updates the menu entry.
         /// </summary>
-        public void Update(bool isSelected, GameTime gameTime)
+        public virtual void Update(MenuScreen screen, bool isSelected, GameTime gameTime)
         {
             // there is no such thing as a selected item on Windows Phone, so we always
             // force isSelected to be false
 #if WINDOWS_PHONE
             isSelected = false;
 #endif
+
             // When the menu selection changes, entries gradually fade between
             // their selected and deselected appearance, rather than instantly
             // popping to the new state.
-            if (_type != EntryType.Separator)
+            float fadeSpeed = (float)gameTime.ElapsedGameTime.TotalSeconds * 4;
-            {
+
-                float fadeSpeed = (float)gameTime.ElapsedGameTime.TotalSeconds * 4;
+            if (isSelected)
-                if (isSelected)
+                selectionFade = Math.Min(selectionFade + fadeSpeed, 1);
-                {
+            else
-                    _selectionFade = Math.Min(_selectionFade + fadeSpeed, 1f);
+                selectionFade = Math.Max(selectionFade - fadeSpeed, 0);
-                }
-                else
-                {
-                    _selectionFade = Math.Max(_selectionFade - fadeSpeed, 0f);
-                }
-                _scale = 0.7f + 0.1f * _selectionFade;
-            }
         }
 
+
         /// <summary>
         /// Draws the menu entry. This can be overridden to customize the appearance.
         /// </summary>
-        public void Draw()
+        public virtual void Draw(MenuScreen screen, bool isSelected, GameTime gameTime)
         {
-            SpriteFont font = _menu.ScreenManager.Fonts.MenuSpriteFont;
+            // there is no such thing as a selected item on Windows Phone, so we always
-            SpriteBatch batch = _menu.ScreenManager.SpriteBatch;
+            // force isSelected to be false
+#if WINDOWS_PHONE
+            isSelected = false;
+#endif
 
-            Color color;
+            // Draw the selected entry in yellow, otherwise white.
-            if (_type == EntryType.Separator)
+            Color color = isSelected ? Color.Yellow : Color.White;
-            {
+
-                color = Color.DarkOrange;
+            // Pulsate the size of the selected menu entry.
-            }
+            double time = gameTime.TotalGameTime.TotalSeconds;
-            else
+            
-            {
+            float pulsate = (float)Math.Sin(time * 6) + 1;
-                // Draw the selected entry in yellow, otherwise white
+
-                color = Color.Lerp(Color.White, new Color(255, 210, 0), _selectionFade);
+            float scale = 1 + pulsate * 0.05f * selectionFade;
-            }
+
-            color *= _alpha;
+            // Modify the alpha to fade text out during transitions.
+            color *= screen.TransitionAlpha;
 
             // Draw text, centered on the middle of each line.
-            batch.DrawString(font, _text, _position - _baseOrigin * _scale + Vector2.One,
+            ScreenManager screenManager = screen.ScreenManager;
-                              Color.DarkSlateGray * _alpha * _alpha, 0, Vector2.Zero, _scale, SpriteEffects.None, 0);
+            SpriteBatch spriteBatch = screenManager.SpriteBatch;
-            batch.DrawString(font, _text, _position - _baseOrigin * _scale, color, 0, Vector2.Zero, _scale,
+            SpriteFont font = screenManager.Font;
-                              SpriteEffects.None, 0);
+
+            Vector2 origin = new Vector2(0, font.LineSpacing / 2);
+
+            spriteBatch.DrawString(font, text, position, color, 0,
+                                   origin, scale, SpriteEffects.None, 0);
         }
 
+
         /// <summary>
         /// Queries how much space this menu entry requires.
         /// </summary>
-        public int GetHeight()
+        public virtual int GetHeight(MenuScreen screen)
         {
-            return (int)_height;
+            return screen.ScreenManager.Font.LineSpacing;
         }
 
+
         /// <summary>
         /// Queries how wide the entry is, used for centering on the screen.
         /// </summary>
-        public int GetWidth()
+        public virtual int GetWidth(MenuScreen screen)
         {
-            return (int)_width;
+            return (int)screen.ScreenManager.Font.MeasureString(Text).X;
         }
+
+
+        #endregion
     }
 }

axios/ScreenSystem/MenuScreen.cs

@@ -1,9 +1,23 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// MenuScreen.cs
+//
+// XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
 using System;
 using System.Collections.Generic;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input.Touch;
+using Microsoft.Xna.Framework.Input;
+using FarseerPhysics.SamplesFramework;
+#endregion
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
     /// <summary>
     /// Base class for screens that contain a menu of options. The user can
@@ -11,225 +25,207 @@ namespace FarseerPhysics.SamplesFramework
     /// </summary>
     public class MenuScreen : GameScreen
     {
-#if WINDOWS || XBOX
+        #region Fields
-        protected const float NumEntries = 15;
-#elif WINDOWS_PHONE
-        protected const float NumEntries = 9;
-#endif
-        protected List<MenuEntry> _menuEntries = new List<MenuEntry>();
-        protected string _menuTitle;
-        protected Vector2 _titlePosition;
-        protected Vector2 _titleOrigin;
-        protected int _selectedEntry;
-        protected float _menuBorderTop;
-        protected float _menuBorderBottom;
-        protected float _menuBorderMargin;
-        protected float _menuOffset;
-        protected float _maxOffset;
 
-        protected Texture2D _texScrollButton;
+        // the number of pixels to pad above and below menu entries for touch input
-        protected Texture2D _texSlider;
+        const int menuEntryPadding = 10;
+
+        private List<MenuEntry> menuEntries = new List<MenuEntry>();
+        int selectedEntry = 0;
+        string menuTitle;
+
+        InputAction menuUp;
+        InputAction menuDown;
+        InputAction menuSelect;
+        InputAction menuCancel;
+
+        #endregion
+
+        #region Properties
+
+
+        /// <summary>
+        /// Gets the list of menu entries, so derived classes can add
+        /// or change the menu contents.
+        /// </summary>
+        protected IList<MenuEntry> MenuEntries
+        {
+            get { return menuEntries; }
+        }
+
+
+        #endregion
+
+        #region Initialization
 
-        protected MenuButton _scrollUp;
-        protected MenuButton _scrollDown;
-        protected MenuButton _scrollSlider;
-        protected bool _scrollLock;
 
         /// <summary>
         /// Constructor.
         /// </summary>
         public MenuScreen(string menuTitle)
         {
-            _menuTitle = menuTitle;
+            this.menuTitle = menuTitle;
+            // menus generally only need Tap for menu selection
+            EnabledGestures = GestureType.Tap;
 
-            TransitionOnTime = TimeSpan.FromSeconds(0.7);
+            TransitionOnTime = TimeSpan.FromSeconds(0.5);
-            TransitionOffTime = TimeSpan.FromSeconds(0.7);
+            TransitionOffTime = TimeSpan.FromSeconds(0.5);
-            HasCursor = true;
+
+            menuUp = new InputAction(
+                new Buttons[] { Buttons.DPadUp, Buttons.LeftThumbstickUp }, 
+                new Keys[] { Keys.Up },
+                true);
+            menuDown = new InputAction(
+                new Buttons[] { Buttons.DPadDown, Buttons.LeftThumbstickDown },
+                new Keys[] { Keys.Down },
+                true);
+            menuSelect = new InputAction(
+                new Buttons[] { Buttons.A, Buttons.Start },
+                new Keys[] { Keys.Enter, Keys.Space },
+                true);
+            menuCancel = new InputAction(
+                new Buttons[] { Buttons.B, Buttons.Back },
+                new Keys[] { Keys.Escape },
+                true);
         }
 
-        public void AddMenuItem(string name, EntryType type, GameScreen screen)
+
+        #endregion
+
+        public void AddMenuItem(string name)
         {
-            MenuEntry entry = new MenuEntry(this, name, type, screen);
+
-            _menuEntries.Add(entry);
+            menuEntries.Add(new MenuEntry(name));
         }
 
-        public void AddMenuItem(MenuEntry me)
+        #region Handle Input
-        {
-            _menuEntries.Add(me);
-        }
-
-        public override void LoadContent()
-        {
-            base.LoadContent();
-            
-            _texScrollButton = ScreenManager.Content.Load<Texture2D>("Common/arrow");
-            _texSlider = ScreenManager.Content.Load<Texture2D>("Common/slider");
-
-            //Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
-            //float scrollBarPos = viewport.Width / 2f;
-            //scrollBarPos -= _texScrollButton.Width + 2f;
-
-            
-
-            InitMenu();
-            
-
-            
-        }
-
-        public void InitMenu()
-        {
-            Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
-            SpriteFont font = ScreenManager.Fonts.MenuSpriteFont;
-            float scrollBarPos = viewport.Width / 2f;
-            
-            for (int i = 0; i < _menuEntries.Count; ++i)
-            {
-                _menuEntries[i].Initialize();
-                scrollBarPos = Math.Min(scrollBarPos,
-                                         (viewport.Width - _menuEntries[i].GetWidth()) / 2f);
-            }
-
-            _titleOrigin = font.MeasureString(_menuTitle) / 2f;
-            _titlePosition = new Vector2(viewport.Width / 2f, font.MeasureString("M").Y / 2f + 10f);
-
-            _menuBorderMargin = font.MeasureString("M").Y * 0.8f;
-            _menuBorderTop = (viewport.Height - _menuBorderMargin * (NumEntries - 1)) / 2f;
-            _menuBorderBottom = (viewport.Height + _menuBorderMargin * (NumEntries - 1)) / 2f;
-
-            _menuOffset = 0f;
-            _maxOffset = Math.Max(0f, (_menuEntries.Count - NumEntries) * _menuBorderMargin);
-
-            _scrollUp = new MenuButton(_texScrollButton, false,
-                                       new Vector2(scrollBarPos, _menuBorderTop - _texScrollButton.Height), this);
-            _scrollDown = new MenuButton(_texScrollButton, true,
-                                         new Vector2(scrollBarPos, _menuBorderBottom + _texScrollButton.Height), this);
-            _scrollSlider = new MenuButton(_texSlider, false, new Vector2(scrollBarPos, _menuBorderTop), this);
-
-            _scrollLock = false;
-        }
 
         /// <summary>
-        /// Returns the index of the menu entry at the position of the given mouse state.
+        /// Allows the screen to create the hit bounds for a particular menu entry.
         /// </summary>
-        /// <returns>Index of menu entry if valid, -1 otherwise</returns>
+        protected virtual Rectangle GetMenuEntryHitBounds(MenuEntry entry)
-        private int GetMenuEntryAt(Vector2 position)
         {
-            if (this.TransitionPosition == 0f && this.ScreenState == SamplesFramework.ScreenState.Active)
+            // the hit bounds are the entire width of the screen, and the height of the entry
-            {
+            // with some additional padding above and below.
-                int index = 0;
+            return new Rectangle(
-                foreach (MenuEntry entry in _menuEntries)
+                0,
-                {
+                (int)entry.Position.Y - menuEntryPadding,
-                    float width = entry.GetWidth();
+                ScreenManager.GraphicsDevice.Viewport.Width,
-                    float height = entry.GetHeight();
+                entry.GetHeight(this) + (menuEntryPadding * 2));
-                    Rectangle rect = new Rectangle((int)(entry.Position.X - width / 2f),
-                                                   (int)(entry.Position.Y - height / 2f),
-                                                   (int)width, (int)height);
-                    if (rect.Contains((int)position.X, (int)position.Y) && entry.Alpha > 0.1f)
-                    {
-                        return index;
-                    }
-                    ++index;
-                }
-            }
-            return -1;
         }
 
         /// <summary>
         /// Responds to user input, changing the selected entry and accepting
         /// or cancelling the menu.
         /// </summary>
-        public override void HandleInput(InputHelper input, GameTime gameTime)
+        public override void HandleInput(GameTime gameTime, InputState input)
         {
-            // Mouse or touch on a menu item
+            // For input tests we pass in our ControllingPlayer, which may
-            int hoverIndex = GetMenuEntryAt(input.Cursor);
+            // either be null (to accept input from any player) or a specific index.
-            if (hoverIndex > -1 && _menuEntries[hoverIndex].IsSelectable() && !_scrollLock)
+            // If we pass a null controlling player, the InputState helper returns to
+            // us which player actually provided the input. We pass that through to
+            // OnSelectEntry and OnCancel, so they can tell which player triggered them.
+            
+
+#if WINDOWS || XBOX360
+            PlayerIndex playerIndex;
+            // Move to the previous menu entry?
+            if (menuUp.Evaluate(input, ControllingPlayer, out playerIndex))
             {
-                _selectedEntry = hoverIndex;
+                selectedEntry--;
-            }
+
-            else
+                if (selectedEntry < 0)
-            {
+                    selectedEntry = menuEntries.Count - 1;
-                _selectedEntry = -1;
             }
 
-            _scrollSlider.Hover = false;
+            // Move to the next menu entry?
-            if (input.IsCursorValid)
+            if (menuDown.Evaluate(input, ControllingPlayer, out playerIndex))
             {
-                _scrollUp.Collide(input.Cursor);
+                selectedEntry++;
-                _scrollDown.Collide(input.Cursor);
+
-                _scrollSlider.Collide(input.Cursor);
+                if (selectedEntry >= menuEntries.Count)
-            }
+                    selectedEntry = 0;
-            else
-            {
-                _scrollUp.Hover = false;
-                _scrollDown.Hover = false;
-                _scrollLock = false;
             }
 
-            // Accept or cancel the menu? 
+            if (menuSelect.Evaluate(input, ControllingPlayer, out playerIndex))
-            if (input.IsMenuSelect() && _selectedEntry != -1)
             {
-                if (_menuEntries[_selectedEntry].IsExitItem())
+                OnSelectEntry(selectedEntry, playerIndex);
+            }
+            else if (menuCancel.Evaluate(input, ControllingPlayer, out playerIndex))
+            {
+                OnCancel(playerIndex);
+            }
+#endif
+
+#if WINDOWS_PHONE
+            //selectedEntry = 1;
+
+            PlayerIndex player;
+            if (input.IsNewButtonPress(Buttons.Back, ControllingPlayer, out player))
+            {
+                OnCancel(player);
+            }
+
+            // look for any taps that occurred and select any entries that were tapped
+            foreach (GestureSample gesture in input.Gestures)
+            {
+                //System.Diagnostics.Debugger.Break();
+                if (gesture.GestureType == GestureType.Tap)
                 {
-                    ScreenManager.Game.Exit();
+                    // convert the position to a Point that we can test against a Rectangle
-                } 
+                    Point tapLocation = new Point((int)gesture.Position.X, (int)gesture.Position.Y);
-                else if (_menuEntries[_selectedEntry].IsBackItem())
+
-                {
+                    // iterate the entries to see if any were tapped
-                    this.ExitScreen();
+                    for (int i = 0; i < menuEntries.Count; i++)
-                }
-                else if (_menuEntries[_selectedEntry].Screen != null)
-                {
-                    ScreenManager.AddScreen(_menuEntries[_selectedEntry].Screen);
-                    if (_menuEntries[_selectedEntry].Screen is IDemoScreen)
                     {
-                        ScreenManager.AddScreen(
+                        MenuEntry menuEntry = menuEntries[i];
-                            new MessageBoxScreen((_menuEntries[_selectedEntry].Screen as IDemoScreen).GetDetails()));
+
+                        if (GetMenuEntryHitBounds(menuEntry).Contains(tapLocation))
+                        {
+                            // select the entry. since gestures are only available on Windows Phone,
+                            // we can safely pass PlayerIndex.One to all entries since there is only
+                            // one player on Windows Phone.
+                            OnSelectEntry(i, PlayerIndex.One);
+                        }
                     }
                 }
             }
-            else if (input.IsMenuCancel())
+#endif
-            {
-                if (this.ScreenState == SamplesFramework.ScreenState.Active && this.TransitionPosition == 0 && this.TransitionAlpha == 1)
-                {
-                    //GameScreen[] screens = ScreenManager.GetScreens();
-                    //if (screens[screens.Length - 1] is BackgroundScreen ||| screens.Length )
-                    //    ScreenManager.Game.Exit();
-                    //if (ScreenManager.GetScreens().Length == 2)
-                    //    ScreenManager.Game.Exit();
-                    //else
-                    this.ExitScreen();
-                }
-                //ScreenManager.Game.Exit();
-            }
-
-            if (input.IsMenuPressed())
-            {
-                if (_scrollUp.Hover)
-                {
-                    _menuOffset = Math.Max(_menuOffset - 200f * (float)gameTime.ElapsedGameTime.TotalSeconds, 0f);
-                    _scrollLock = false;
-                }
-                if (_scrollDown.Hover)
-                {
-                    _menuOffset = Math.Min(_menuOffset + 200f * (float)gameTime.ElapsedGameTime.TotalSeconds, _maxOffset);
-                    _scrollLock = false;
-                }
-                if (_scrollSlider.Hover)
-                {
-                    _scrollLock = true;
-                }
-            }
-            if (input.IsMenuReleased())
-            {
-                _scrollLock = false;
-            }
-            if (_scrollLock)
-            {
-                _scrollSlider.Hover = true;
-                _menuOffset = Math.Max(Math.Min(((input.Cursor.Y - _menuBorderTop) / (_menuBorderBottom - _menuBorderTop)) * _maxOffset, _maxOffset), 0f);
-            }
         }
 
+
+        /// <summary>
+        /// Handler for when the user has chosen a menu entry.
+        /// </summary>
+        protected virtual void OnSelectEntry(int entryIndex, PlayerIndex playerIndex)
+        {
+            menuEntries[entryIndex].OnSelectEntry(playerIndex);
+        }
+
+
+        /// <summary>
+        /// Handler for when the user has cancelled the menu.
+        /// </summary>
+        protected virtual void OnCancel(PlayerIndex playerIndex)
+        {
+            ExitScreen();
+        }
+
+
+        /// <summary>
+        /// Helper overload makes it easy to use OnCancel as a MenuEntry event handler.
+        /// </summary>
+        protected void OnCancel(object sender, PlayerIndexEventArgs e)
+        {
+            OnCancel(e.PlayerIndex);
+        }
+
+
+        #endregion
+
+        #region Update and Draw
+
+
         /// <summary>
         /// Allows the screen the chance to position the menu entries. By default
         /// all menu entries are lined up in a vertical list, centered on the screen.
@@ -241,69 +237,49 @@ namespace FarseerPhysics.SamplesFramework
             // the movement slow down as it nears the end).
             float transitionOffset = (float)Math.Pow(TransitionPosition, 2);
 
-            Vector2 position = Vector2.Zero;
+            // start at Y = 175; each X value is generated per entry
-            position.Y = _menuBorderTop - _menuOffset;
+            Vector2 position = new Vector2(0f, 175f);
 
             // update each menu entry's location in turn
-            for (int i = 0; i < _menuEntries.Count; ++i)
+            for (int i = 0; i < menuEntries.Count; i++)
             {
-                position.X = ScreenManager.GraphicsDevice.Viewport.Width / 2f;
+                MenuEntry menuEntry = menuEntries[i];
+                
+                // each entry is to be centered horizontally
+                position.X = ScreenManager.GraphicsDevice.Viewport.Width / 2 - menuEntry.GetWidth(this) / 2;
+
                 if (ScreenState == ScreenState.TransitionOn)
-                {
                     position.X -= transitionOffset * 256;
-                }
                 else
-                {
+                    position.X += transitionOffset * 512;
-                    position.X += transitionOffset * 256;
-                }
 
                 // set the entry's position
-                _menuEntries[i].Position = position;
+                menuEntry.Position = position;
-
-                if (position.Y < _menuBorderTop)
-                {
-                    _menuEntries[i].Alpha = 1f -
-                                            Math.Min(_menuBorderTop - position.Y, _menuBorderMargin) / _menuBorderMargin;
-                }
-                else if (position.Y > _menuBorderBottom)
-                {
-                    _menuEntries[i].Alpha = 1f -
-                                            Math.Min(position.Y - _menuBorderBottom, _menuBorderMargin) /
-                                            _menuBorderMargin;
-                }
-                else
-                {
-                    _menuEntries[i].Alpha = 1f;
-                }
 
                 // move down for the next entry the size of this entry
-                position.Y += _menuEntries[i].GetHeight();
+                position.Y += menuEntry.GetHeight(this);
             }
-            Vector2 scrollPos = _scrollSlider.Position;
-            scrollPos.Y = MathHelper.Lerp(_menuBorderTop, _menuBorderBottom, _menuOffset / _maxOffset);
-            _scrollSlider.Position = scrollPos;
         }
 
+
         /// <summary>
         /// Updates the menu.
         /// </summary>
         public override void Update(GameTime gameTime, bool otherScreenHasFocus,
-                                    bool coveredByOtherScreen)
+                                                       bool coveredByOtherScreen)
         {
             base.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
 
             // Update each nested MenuEntry object.
-            for (int i = 0; i < _menuEntries.Count; ++i)
+            for (int i = 0; i < menuEntries.Count; i++)
             {
-                bool isSelected = IsActive && (i == _selectedEntry);
+                bool isSelected = IsActive && (i == selectedEntry);
-                _menuEntries[i].Update(isSelected, gameTime);
-            }
 
-            _scrollUp.Update(gameTime);
+                menuEntries[i].Update(this, isSelected, gameTime);
-            _scrollDown.Update(gameTime);
+            }
-            _scrollSlider.Update(gameTime);
         }
 
+
         /// <summary>
         /// Draws the menu.
         /// </summary>
@@ -312,30 +288,42 @@ namespace FarseerPhysics.SamplesFramework
             // make sure our entries are in the right place before we draw them
             UpdateMenuEntryLocations();
 
+            GraphicsDevice graphics = ScreenManager.GraphicsDevice;
             SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
-            SpriteFont font = ScreenManager.Fonts.MenuSpriteFont;
+            SpriteFont font = ScreenManager.Font;
 
             spriteBatch.Begin();
+
             // Draw each menu entry in turn.
-            for (int i = 0; i < _menuEntries.Count; ++i)
+            for (int i = 0; i < menuEntries.Count; i++)
             {
-                bool isSelected = IsActive && (i == _selectedEntry);
+                MenuEntry menuEntry = menuEntries[i];
-                _menuEntries[i].Draw();
+
+                bool isSelected = IsActive && (i == selectedEntry);
+
+                menuEntry.Draw(this, isSelected, gameTime);
             }
 
             // Make the menu slide into place during transitions, using a
             // power curve to make things look more interesting (this makes
             // the movement slow down as it nears the end).
-            Vector2 transitionOffset = new Vector2(0f, (float)Math.Pow(TransitionPosition, 2) * 100f);
+            float transitionOffset = (float)Math.Pow(TransitionPosition, 2);
+
+            // Draw the menu title centered on the screen
+            Vector2 titlePosition = new Vector2(graphics.Viewport.Width / 2, 80);
+            Vector2 titleOrigin = font.MeasureString(menuTitle) / 2;
+            Color titleColor = new Color(192, 192, 192) * TransitionAlpha;
+            float titleScale = 1.25f;
+
+            titlePosition.Y -= transitionOffset * 100;
+
+            spriteBatch.DrawString(font, menuTitle, titlePosition, titleColor, 0,
+                                   titleOrigin, titleScale, SpriteEffects.None, 0);
 
-            spriteBatch.DrawString(font, _menuTitle, _titlePosition - transitionOffset + Vector2.One * 2f, Color.Black, 0,
-                                   _titleOrigin, 1f, SpriteEffects.None, 0);
-            spriteBatch.DrawString(font, _menuTitle, _titlePosition - transitionOffset, new Color(255, 210, 0), 0,
-                                   _titleOrigin, 1f, SpriteEffects.None, 0);
-            _scrollUp.Draw();
-            _scrollSlider.Draw();
-            _scrollDown.Draw();
             spriteBatch.End();
         }
+
+
+        #endregion
     }
 }

axios/ScreenSystem/MessageBoxScreen.cs

@@ -1,36 +1,87 @@
-using System;
+#region File Description
+//-----------------------------------------------------------------------------
+// MessageBoxScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+using GameStateManagement;
+#endregion
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
     /// <summary>
     /// A popup message box screen, used to display "are you sure?"
     /// confirmation messages.
     /// </summary>
-    public class MessageBoxScreen : GameScreen
+    class MessageBoxScreen : GameScreen
     {
-        protected Rectangle _backgroundRectangle;
+        #region Fields
-        protected Texture2D _gradientTexture;
-        protected string _message;
-        protected Vector2 _textPosition;
 
+        string message;
+        Texture2D gradientTexture;
+
+        InputAction menuSelect;
+        InputAction menuCancel;
+
+        #endregion
+
+        #region Events
+
+        public event EventHandler<PlayerIndexEventArgs> Accepted;
+        public event EventHandler<PlayerIndexEventArgs> Cancelled;
+
+        #endregion
+
+        #region Initialization
+
+
+        /// <summary>
+        /// Constructor automatically includes the standard "A=ok, B=cancel"
+        /// usage text prompt.
+        /// </summary>
         public MessageBoxScreen(string message)
+            : this(message, true)
+        { }
+
+
+        /// <summary>
+        /// Constructor lets the caller specify whether to include the standard
+        /// "A=ok, B=cancel" usage text prompt.
+        /// </summary>
+        public MessageBoxScreen(string message, bool includeUsageText)
         {
-            _message = message;
+            const string usageText = "\nA button, Space, Enter = ok" +
+                                     "\nB button, Esc = cancel"; 
+            
+            if (includeUsageText)
+                this.message = message + usageText;
+            else
+                this.message = message;
 
             IsPopup = true;
-            HasCursor = true;
 
-            TransitionOnTime = TimeSpan.FromSeconds(0.4);
+            TransitionOnTime = TimeSpan.FromSeconds(0.2);
-            TransitionOffTime = TimeSpan.FromSeconds(0.4);
+            TransitionOffTime = TimeSpan.FromSeconds(0.2);
+
+            menuSelect = new InputAction(
+                new Buttons[] { Buttons.A, Buttons.Start },
+                new Keys[] { Keys.Space, Keys.Enter },
+                true);
+            menuCancel = new InputAction(
+                new Buttons[] { Buttons.B, Buttons.Back },
+                new Keys[] { Keys.Escape, Keys.Back },
+                true);
         }
 
-        public MessageBoxScreen()
-        {
-            IsPopup = true;
-        }
 
         /// <summary>
         /// Loads graphics content for this screen. This uses the shared ContentManager
@@ -38,62 +89,98 @@ namespace FarseerPhysics.SamplesFramework
         /// Whenever a subsequent MessageBoxScreen tries to load this same content,
         /// it will just get back another reference to the already loaded data.
         /// </summary>
-        public override void LoadContent()
+        public override void Activate(bool instancePreserved)
         {
-            SpriteFont font = ScreenManager.Fonts.DetailsFont;
+            if (!instancePreserved)
-            ContentManager content = ScreenManager.Game.Content;
+            {
-            _gradientTexture = content.Load<Texture2D>("Common/popup");
+                ContentManager content = ScreenManager.Game.Content;
-
+                gradientTexture = content.Load<Texture2D>("gradient");
-            // Center the message text in the viewport.
+            }
-            Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
-            Vector2 viewportSize = new Vector2(viewport.Width, viewport.Height);
-            Vector2 textSize = font.MeasureString(_message);
-            _textPosition = (viewportSize - textSize) / 2;
-
-            // The background includes a border somewhat larger than the text itself.
-            const int hPad = 32;
-            const int vPad = 16;
-
-            _backgroundRectangle = new Rectangle((int)_textPosition.X - hPad,
-                                                 (int)_textPosition.Y - vPad,
-                                                 (int)textSize.X + hPad * 2,
-                                                 (int)textSize.Y + vPad * 2);
         }
 
+
+        #endregion
+
+        #region Handle Input
+
+
         /// <summary>
         /// Responds to user input, accepting or cancelling the message box.
         /// </summary>
-        public override void HandleInput(InputHelper input, GameTime gameTime)
+        public override void HandleInput(GameTime gameTime, InputState input)
         {
+            PlayerIndex playerIndex;
 
-            if (input.IsMenuSelect() || input.IsMenuCancel() ||
+            // We pass in our ControllingPlayer, which may either be null (to
-                input.IsNewMouseButtonPress(MouseButtons.LeftButton))
+            // accept input from any player) or a specific index. If we pass a null
+            // controlling player, the InputState helper returns to us which player
+            // actually provided the input. We pass that through to our Accepted and
+            // Cancelled events, so they can tell which player triggered them.
+            if (menuSelect.Evaluate(input, ControllingPlayer, out playerIndex))
             {
+                // Raise the accepted event, then exit the message box.
+                if (Accepted != null)
+                    Accepted(this, new PlayerIndexEventArgs(playerIndex));
+
+                ExitScreen();
+            }
+            else if (menuCancel.Evaluate(input, ControllingPlayer, out playerIndex))
+            {
+                // Raise the cancelled event, then exit the message box.
+                if (Cancelled != null)
+                    Cancelled(this, new PlayerIndexEventArgs(playerIndex));
+
                 ExitScreen();
             }
         }
 
+
+        #endregion
+
+        #region Draw
+
+
         /// <summary>
         /// Draws the message box.
         /// </summary>
         public override void Draw(GameTime gameTime)
         {
             SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
-            SpriteFont font = ScreenManager.Fonts.DetailsFont;
+            SpriteFont font = ScreenManager.Font;
+
+            // Darken down any other screens that were drawn beneath the popup.
+            ScreenManager.FadeBackBufferToBlack(TransitionAlpha * 2 / 3);
+
+            // Center the message text in the viewport.
+            Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
+            Vector2 viewportSize = new Vector2(viewport.Width, viewport.Height);
+            Vector2 textSize = font.MeasureString(message);
+            Vector2 textPosition = (viewportSize - textSize) / 2;
+
+            // The background includes a border somewhat larger than the text itself.
+            const int hPad = 32;
+            const int vPad = 16;
+
+            Rectangle backgroundRectangle = new Rectangle((int)textPosition.X - hPad,
+                                                          (int)textPosition.Y - vPad,
+                                                          (int)textSize.X + hPad * 2,
+                                                          (int)textSize.Y + vPad * 2);
 
             // Fade the popup alpha during transitions.
-            Color color = Color.White * TransitionAlpha * (2f / 3f);
+            Color color = Color.White * TransitionAlpha;
 
             spriteBatch.Begin();
 
             // Draw the background rectangle.
-            spriteBatch.Draw(_gradientTexture, _backgroundRectangle, color);
+            spriteBatch.Draw(gradientTexture, backgroundRectangle, color);
 
             // Draw the message box text.
-            spriteBatch.DrawString(font, _message, _textPosition + Vector2.One, Color.Black);
+            spriteBatch.DrawString(font, message, textPosition, color);
-            spriteBatch.DrawString(font, _message, _textPosition, Color.White);
 
             spriteBatch.End();
         }
+
+
+        #endregion
     }
 }

axios/ScreenSystem/OptionsMenuScreen.cs

@@ -0,0 +1,149 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// OptionsMenuScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using Microsoft.Xna.Framework;
+#endregion
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// The options screen is brought up over the top of the main menu
+    /// screen, and gives the user a chance to configure the game
+    /// in various hopefully useful ways.
+    /// </summary>
+    class OptionsMenuScreen : MenuScreen
+    {
+        #region Fields
+
+        MenuEntry ungulateMenuEntry;
+        MenuEntry languageMenuEntry;
+        MenuEntry frobnicateMenuEntry;
+        MenuEntry elfMenuEntry;
+
+        enum Ungulate
+        {
+            BactrianCamel,
+            Dromedary,
+            Llama,
+        }
+
+        static Ungulate currentUngulate = Ungulate.Dromedary;
+
+        static string[] languages = { "C#", "French", "Deoxyribonucleic acid" };
+        static int currentLanguage = 0;
+
+        static bool frobnicate = true;
+
+        static int elf = 23;
+
+        #endregion
+
+        #region Initialization
+
+
+        /// <summary>
+        /// Constructor.
+        /// </summary>
+        public OptionsMenuScreen()
+            : base("Options")
+        {
+            // Create our menu entries.
+            ungulateMenuEntry = new MenuEntry(string.Empty);
+            languageMenuEntry = new MenuEntry(string.Empty);
+            frobnicateMenuEntry = new MenuEntry(string.Empty);
+            elfMenuEntry = new MenuEntry(string.Empty);
+
+            SetMenuEntryText();
+
+            MenuEntry back = new MenuEntry("Back");
+
+            // Hook up menu event handlers.
+            ungulateMenuEntry.Selected += UngulateMenuEntrySelected;
+            languageMenuEntry.Selected += LanguageMenuEntrySelected;
+            frobnicateMenuEntry.Selected += FrobnicateMenuEntrySelected;
+            elfMenuEntry.Selected += ElfMenuEntrySelected;
+            back.Selected += OnCancel;
+            
+            // Add entries to the menu.
+            MenuEntries.Add(ungulateMenuEntry);
+            MenuEntries.Add(languageMenuEntry);
+            MenuEntries.Add(frobnicateMenuEntry);
+            MenuEntries.Add(elfMenuEntry);
+            MenuEntries.Add(back);
+        }
+
+
+        /// <summary>
+        /// Fills in the latest values for the options screen menu text.
+        /// </summary>
+        void SetMenuEntryText()
+        {
+            ungulateMenuEntry.Text = "Preferred ungulate: " + currentUngulate;
+            languageMenuEntry.Text = "Language: " + languages[currentLanguage];
+            frobnicateMenuEntry.Text = "Frobnicate: " + (frobnicate ? "on" : "off");
+            elfMenuEntry.Text = "elf: " + elf;
+        }
+
+
+        #endregion
+
+        #region Handle Input
+
+
+        /// <summary>
+        /// Event handler for when the Ungulate menu entry is selected.
+        /// </summary>
+        void UngulateMenuEntrySelected(object sender, PlayerIndexEventArgs e)
+        {
+            currentUngulate++;
+
+            if (currentUngulate > Ungulate.Llama)
+                currentUngulate = 0;
+
+            SetMenuEntryText();
+        }
+
+
+        /// <summary>
+        /// Event handler for when the Language menu entry is selected.
+        /// </summary>
+        void LanguageMenuEntrySelected(object sender, PlayerIndexEventArgs e)
+        {
+            currentLanguage = (currentLanguage + 1) % languages.Length;
+
+            SetMenuEntryText();
+        }
+
+
+        /// <summary>
+        /// Event handler for when the Frobnicate menu entry is selected.
+        /// </summary>
+        void FrobnicateMenuEntrySelected(object sender, PlayerIndexEventArgs e)
+        {
+            frobnicate = !frobnicate;
+
+            SetMenuEntryText();
+        }
+
+
+        /// <summary>
+        /// Event handler for when the Elf menu entry is selected.
+        /// </summary>
+        void ElfMenuEntrySelected(object sender, PlayerIndexEventArgs e)
+        {
+            elf++;
+
+            SetMenuEntryText();
+        }
+
+
+        #endregion
+    }
+}

axios/ScreenSystem/PauseMenuScreen.cs

@@ -0,0 +1,79 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// PauseMenuScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using Microsoft.Xna.Framework;
+#endregion
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// The pause menu comes up over the top of the game,
+    /// giving the player options to resume or quit.
+    /// </summary>
+    class PauseMenuScreen : MenuScreen
+    {
+        #region Initialization
+
+
+        /// <summary>
+        /// Constructor.
+        /// </summary>
+        public PauseMenuScreen()
+            : base("Paused")
+        {
+            // Create our menu entries.
+            MenuEntry resumeGameMenuEntry = new MenuEntry("Resume Game");
+            MenuEntry quitGameMenuEntry = new MenuEntry("Quit Game");
+            
+            // Hook up menu event handlers.
+            resumeGameMenuEntry.Selected += OnCancel;
+            quitGameMenuEntry.Selected += QuitGameMenuEntrySelected;
+
+            // Add entries to the menu.
+            MenuEntries.Add(resumeGameMenuEntry);
+            MenuEntries.Add(quitGameMenuEntry);
+        }
+
+
+        #endregion
+
+        #region Handle Input
+
+
+        /// <summary>
+        /// Event handler for when the Quit Game menu entry is selected.
+        /// </summary>
+        void QuitGameMenuEntrySelected(object sender, PlayerIndexEventArgs e)
+        {
+            const string message = "Are you sure you want to quit this game?";
+
+            MessageBoxScreen confirmQuitMessageBox = new MessageBoxScreen(message);
+
+            confirmQuitMessageBox.Accepted += ConfirmQuitMessageBoxAccepted;
+
+            ScreenManager.AddScreen(confirmQuitMessageBox, ControllingPlayer);
+        }
+
+
+        /// <summary>
+        /// Event handler for when the user selects ok on the "are you sure
+        /// you want to quit" message box. This uses the loading screen to
+        /// transition from the game back to the main menu screen.
+        /// </summary>
+        void ConfirmQuitMessageBoxAccepted(object sender, PlayerIndexEventArgs e)
+        {
+            LoadingScreen.Load(ScreenManager, false, null, new BackgroundScreen(),
+                                                           new MainMenuScreen());
+        }
+
+
+        #endregion
+    }
+}

axios/ScreenSystem/PhoneMainMenuScreen.cs

@@ -0,0 +1,66 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// PhoneMainMenuScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+using System;
+using GameStateManagement;
+using GameStateManagementSample;
+using Microsoft.Xna.Framework;
+
+namespace GameStateManagement
+{
+    class PhoneMainMenuScreen : PhoneMenuScreen
+    {
+        public PhoneMainMenuScreen()
+            : base("Main Menu")
+        {
+            // Create a button to start the game
+            Button playButton = new Button("Play");
+            playButton.Tapped += playButton_Tapped;
+            MenuButtons.Add(playButton);
+
+            // Create two buttons to toggle sound effects and music. This sample just shows one way
+            // of making and using these buttons; it doesn't actually have sound effects or music
+            BooleanButton sfxButton = new BooleanButton("Sound Effects", true);
+            sfxButton.Tapped += sfxButton_Tapped;
+            MenuButtons.Add(sfxButton);
+
+            BooleanButton musicButton = new BooleanButton("Music", true);
+            musicButton.Tapped += musicButton_Tapped;
+            MenuButtons.Add(musicButton);
+        }
+
+        void playButton_Tapped(object sender, EventArgs e)
+        {
+            // When the "Play" button is tapped, we load the GameplayScreen
+            LoadingScreen.Load(ScreenManager, true, PlayerIndex.One, new GameplayScreen());
+        }
+
+        void sfxButton_Tapped(object sender, EventArgs e)
+        {
+            BooleanButton button = sender as BooleanButton;
+
+            // In a real game, you'd want to store away the value of 
+            // the button to turn off sounds here. :)
+        }
+
+        void musicButton_Tapped(object sender, EventArgs e)
+        {
+            BooleanButton button = sender as BooleanButton;
+
+            // In a real game, you'd want to store away the value of 
+            // the button to turn off music here. :)
+        }
+
+        protected override void OnCancel()
+        {
+            ScreenManager.Game.Exit();
+            base.OnCancel();
+        }
+    }
+}

axios/ScreenSystem/PhoneMenuScreen.cs

@@ -0,0 +1,149 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// PhoneMenuScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+using System;
+using System.Collections.Generic;
+using GameStateManagement;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+using Microsoft.Xna.Framework.Input.Touch;
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// Provides a basic base screen for menus on Windows Phone leveraging the Button class.
+    /// </summary>
+    class PhoneMenuScreen : GameScreen
+    {
+        List<Button> menuButtons = new List<Button>();
+        string menuTitle;
+
+        InputAction menuCancel;
+
+        /// <summary>
+        /// Gets the list of buttons, so derived classes can add or change the menu contents.
+        /// </summary>
+        protected IList<Button> MenuButtons
+        {
+            get { return menuButtons; }
+        }
+
+        /// <summary>
+        /// Creates the PhoneMenuScreen with a particular title.
+        /// </summary>
+        /// <param name="title">The title of the screen</param>
+        public PhoneMenuScreen(string title)
+        {
+            menuTitle = title;
+
+            TransitionOnTime = TimeSpan.FromSeconds(0.5);
+            TransitionOffTime = TimeSpan.FromSeconds(0.5);
+
+            // Create the menuCancel action
+            menuCancel = new InputAction(new Buttons[] { Buttons.Back }, null, true);
+
+            // We need tap gestures to hit the buttons
+            EnabledGestures = GestureType.Tap;
+        }
+
+        public override void Activate(bool instancePreserved)
+        {
+            // When the screen is activated, we have a valid ScreenManager so we can arrange
+            // our buttons on the screen
+            float y = 140f;
+            float center = ScreenManager.GraphicsDevice.Viewport.Bounds.Center.X;
+            for (int i = 0; i < MenuButtons.Count; i++)
+            {
+                Button b = MenuButtons[i];
+
+                b.Position = new Vector2(center - b.Size.X / 2, y);
+                y += b.Size.Y * 1.5f;
+            }
+
+            base.Activate(instancePreserved);
+        }
+
+        public override void Update(GameTime gameTime, bool otherScreenHasFocus, bool coveredByOtherScreen)
+        {
+            // Update opacity of the buttons
+            foreach (Button b in menuButtons)
+            {
+                b.Alpha = TransitionAlpha;
+            }
+
+            base.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
+        }
+
+        /// <summary>
+        /// An overrideable method called whenever the menuCancel action is triggered
+        /// </summary>
+        protected virtual void OnCancel() { }
+
+        public override void HandleInput(GameTime gameTime, InputState input)
+        {
+            // Test for the menuCancel action
+            PlayerIndex player;
+            if (menuCancel.Evaluate(input, ControllingPlayer, out player))
+            {
+                OnCancel();
+            }
+
+            // Read in our gestures
+            foreach (GestureSample gesture in input.Gestures)
+            {
+                // If we have a tap
+                if (gesture.GestureType == GestureType.Tap)
+                {
+                    // Test the tap against the buttons until one of the buttons handles the tap
+                    foreach (Button b in menuButtons)
+                    {
+                        if (b.HandleTap(gesture.Position))
+                            break;
+                    }
+                }
+            }
+
+            base.HandleInput(gameTime, input);
+        }
+
+        public override void Draw(GameTime gameTime)
+        {
+            GraphicsDevice graphics = ScreenManager.GraphicsDevice;
+            SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
+            SpriteFont font = ScreenManager.Font;
+
+            spriteBatch.Begin();
+
+            // Draw all of the buttons
+            foreach (Button b in menuButtons)
+                b.Draw(this);
+
+            // Make the menu slide into place during transitions, using a
+            // power curve to make things look more interesting (this makes
+            // the movement slow down as it nears the end).
+            float transitionOffset = (float)Math.Pow(TransitionPosition, 2);
+
+            // Draw the menu title centered on the screen
+            Vector2 titlePosition = new Vector2(graphics.Viewport.Width / 2, 80);
+            Vector2 titleOrigin = font.MeasureString(menuTitle) / 2;
+            Color titleColor = new Color(192, 192, 192) * TransitionAlpha;
+            float titleScale = 1.25f;
+
+            titlePosition.Y -= transitionOffset * 100;
+
+            spriteBatch.DrawString(font, menuTitle, titlePosition, titleColor, 0, 
+                                   titleOrigin, titleScale, SpriteEffects.None, 0);
+
+            spriteBatch.End();
+
+            base.Draw(gameTime);
+        }
+    }
+}

axios/ScreenSystem/PhonePauseScreen.cs

@@ -0,0 +1,57 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// PhonePauseScreen.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+using System;
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// A basic pause screen for Windows Phone
+    /// </summary>
+    class PhonePauseScreen : PhoneMenuScreen
+    {
+        public PhonePauseScreen()
+            : base("Paused")
+        {
+            // Create the "Resume" and "Exit" buttons for the screen
+
+            Button resumeButton = new Button("Resume");
+            resumeButton.Tapped += resumeButton_Tapped;
+            MenuButtons.Add(resumeButton);
+
+            Button exitButton = new Button("Exit");
+            exitButton.Tapped += exitButton_Tapped;
+            MenuButtons.Add(exitButton);
+        }
+
+        /// <summary>
+        /// The "Resume" button handler just calls the OnCancel method so that 
+        /// pressing the "Resume" button is the same as pressing the hardware back button.
+        /// </summary>
+        void resumeButton_Tapped(object sender, EventArgs e)
+        {
+            OnCancel();
+        }
+
+        /// <summary>
+        /// The "Exit" button handler uses the LoadingScreen to take the user out to the main menu.
+        /// </summary>
+        void exitButton_Tapped(object sender, EventArgs e)
+        {
+            LoadingScreen.Load(ScreenManager, false, null, new BackgroundScreen(),
+                                                           new PhoneMainMenuScreen());
+        }
+
+        protected override void OnCancel()
+        {
+            ExitScreen();
+            base.OnCancel();
+        }
+    }
+}

axios/ScreenSystem/PhysicsGameScreen.cs

@@ -6,9 +6,10 @@ using FarseerPhysics.Dynamics.Joints;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Input;
+using FarseerPhysics.SamplesFramework;
 using Axios.Engine;
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
     public class PhysicsGameScreen : GameScreen
     {
@@ -49,46 +50,50 @@ namespace FarseerPhysics.SamplesFramework
 
 
 
-        public override void LoadContent()
+        public override void Activate(bool instancePreserved)
         {
-            base.LoadContent();
+            if (!instancePreserved)
-
-            //We enable diagnostics to show get values for our performance counters.
-            Settings.EnableDiagnostics = true;
-
-            if (World == null)
             {
-                World = new World(Vector2.Zero);
+                base.Activate(instancePreserved);
-            }
-            else
-            {
-                World.Clear();
-            }
 
-            if (DebugView == null)
+                //We enable diagnostics to show get values for our performance counters.
-            {
+                Settings.EnableDiagnostics = true;
-                if (!Axios.Settings.ScreenSaver)
+
+                if (World == null)
                 {
-                    DebugView = new DebugViewXNA(World);
+                    World = new World(Vector2.Zero);
-                    DebugView.RemoveFlags(DebugViewFlags.Shape);
+                }
-                    DebugView.RemoveFlags(DebugViewFlags.Joint);
+                else
-                    DebugView.DefaultShapeColor = Color.White;
+                {
-                    DebugView.SleepingShapeColor = Color.LightGray;
+                    World.Clear();
-                    DebugView.LoadContent(ScreenManager.GraphicsDevice, ScreenManager.Content);
                 }
-            }
 
-            if (Camera == null)
+                if (DebugView == null)
-            {
+                {
-                Camera = new Camera2D(ScreenManager.GraphicsDevice);
+                    if (!Axios.Settings.ScreenSaver)
-            }
+                    {
-            else
+                        ContentManager man = new ContentManager(this.ScreenManager.Game.Services, "Content");
-            {
+                        DebugView = new DebugViewXNA(World);
-                Camera.ResetCamera();
+                        DebugView.RemoveFlags(DebugViewFlags.Shape);
-            }
+                        DebugView.RemoveFlags(DebugViewFlags.Joint);
+                        DebugView.DefaultShapeColor = Color.White;
+                        DebugView.SleepingShapeColor = Color.LightGray;
+                        DebugView.LoadContent(ScreenManager.GraphicsDevice, man);
+                    }
+                }
 
-            // Loading may take a while... so prevent the game from "catching up" once we finished loading
+                if (Camera == null)
-            ScreenManager.Game.ResetElapsedTime();
+                {
+                    Camera = new Camera2D(ScreenManager.GraphicsDevice);
+                }
+                else
+                {
+                    Camera.ResetCamera();
+                }
+
+                // Loading may take a while... so prevent the game from "catching up" once we finished loading
+                ScreenManager.Game.ResetElapsedTime();
+            }
         }
 
         public override void Update(GameTime gameTime, bool otherScreenHasFocus, bool coveredByOtherScreen)
@@ -110,12 +115,13 @@ namespace FarseerPhysics.SamplesFramework
         {
 
         }
-        public override void HandleInput(InputHelper input, GameTime gameTime)
+        public override void HandleInput(GameTime gameTime, InputState input)
         {
 
 #if DEBUG
             // Control debug view
-            if (input.IsNewButtonPress(Buttons.Start))
+            PlayerIndex player;
+            if (input.IsNewButtonPress(Buttons.Start, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.Shape);
                 EnableOrDisableFlag(DebugViewFlags.DebugPanel);
@@ -126,37 +132,37 @@ namespace FarseerPhysics.SamplesFramework
                 EnableOrDisableFlag(DebugViewFlags.Controllers);
             }
 
-            if (input.IsNewKeyPress(Keys.F1))
+            if (input.IsNewKeyPress(Keys.F1, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.Shape);
             }
-            if (input.IsNewKeyPress(Keys.F2))
+            if (input.IsNewKeyPress(Keys.F2, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.DebugPanel);
                 EnableOrDisableFlag(DebugViewFlags.PerformanceGraph);
             }
-            if (input.IsNewKeyPress(Keys.F3))
+            if (input.IsNewKeyPress(Keys.F3, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.Joint);
             }
-            if (input.IsNewKeyPress(Keys.F4))
+            if (input.IsNewKeyPress(Keys.F4, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.ContactPoints);
                 EnableOrDisableFlag(DebugViewFlags.ContactNormals);
             }
-            if (input.IsNewKeyPress(Keys.F5))
+            if (input.IsNewKeyPress(Keys.F5, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.PolygonPoints);
             }
-            if (input.IsNewKeyPress(Keys.F6))
+            if (input.IsNewKeyPress(Keys.F6, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.Controllers);
             }
-            if (input.IsNewKeyPress(Keys.F7))
+            if (input.IsNewKeyPress(Keys.F7, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.CenterOfMass);
             }
-            if (input.IsNewKeyPress(Keys.F8))
+            if (input.IsNewKeyPress(Keys.F8, ControllingPlayer.Value, out player))
             {
                 EnableOrDisableFlag(DebugViewFlags.AABB);
             }
@@ -179,9 +185,10 @@ namespace FarseerPhysics.SamplesFramework
                 HandleCursor(input);
             }
 
-            if (input.IsNewButtonPress(Buttons.Back) || input.IsNewKeyPress(Keys.Escape))
+            PlayerIndex i;
+            if (input.IsNewButtonPress(Buttons.Back, PlayerIndex.One, out i) || input.IsNewKeyPress(Keys.Escape, PlayerIndex.One, out i))
             {
-                if (this.ScreenState == SamplesFramework.ScreenState.Active && this.TransitionPosition == 0 && this.TransitionAlpha == 1)
+                if (this.ScreenState == GameStateManagement.ScreenState.Active && this.TransitionPosition == 0 && this.TransitionAlpha == 1)
                 { //Give the screens a chance to transition
 
                     CleanUp();
@@ -189,14 +196,15 @@ namespace FarseerPhysics.SamplesFramework
 
                 }
             }
-            base.HandleInput(input, gameTime);
+            base.HandleInput(gameTime, input);
         }
 
-        public virtual void HandleCursor(InputHelper input)
+        public virtual void HandleCursor(InputState input)
         {
+            PlayerIndex player;
             Vector2 position = Camera.ConvertScreenToWorld(input.Cursor);
 
-            if ((input.IsNewButtonPress(Buttons.A) ||
+            if ((input.IsNewButtonPress(Buttons.A, PlayerIndex.One, out player) ||
                     input.IsNewMouseButtonPress(MouseButtons.LeftButton)) &&
                 _fixedMouseJoint == null)
             {
@@ -211,7 +219,8 @@ namespace FarseerPhysics.SamplesFramework
                 }
             }
 
-            if ((input.IsNewButtonRelease(Buttons.A) ||
+            
+            if ((input.IsNewButtonRelease(Buttons.A, ControllingPlayer.Value, out player) ||
                     input.IsNewMouseButtonRelease(MouseButtons.LeftButton)) &&
                 _fixedMouseJoint != null)
             {
@@ -226,32 +235,32 @@ namespace FarseerPhysics.SamplesFramework
             
         }
 
-        private void HandleCamera(InputHelper input, GameTime gameTime)
+        private void HandleCamera(InputState input, GameTime gameTime)
         {
             Vector2 camMove = Vector2.Zero;
 
 
-            if (input.KeyboardState.IsKeyDown(Keys.Up))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.Up))
             {
                 camMove.Y -= 10f * (float)gameTime.ElapsedGameTime.TotalSeconds;
             }
-            if (input.KeyboardState.IsKeyDown(Keys.Down))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.Down))
             {
                 camMove.Y += 10f * (float)gameTime.ElapsedGameTime.TotalSeconds;
             }
-            if (input.KeyboardState.IsKeyDown(Keys.Left))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.Left))
             {
                 camMove.X -= 10f * (float)gameTime.ElapsedGameTime.TotalSeconds;
             }
-            if (input.KeyboardState.IsKeyDown(Keys.Right))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.Right))
             {
                 camMove.X += 10f * (float)gameTime.ElapsedGameTime.TotalSeconds;
             }
-            if (input.KeyboardState.IsKeyDown(Keys.PageUp))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.PageUp))
             {
                 Camera.Zoom += 5f * (float)gameTime.ElapsedGameTime.TotalSeconds * Camera.Zoom / 20f;
             }
-            if (input.KeyboardState.IsKeyDown(Keys.PageDown))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.PageDown))
             {
                 Camera.Zoom -= 5f * (float)gameTime.ElapsedGameTime.TotalSeconds * Camera.Zoom / 20f;
             }
@@ -259,19 +268,20 @@ namespace FarseerPhysics.SamplesFramework
             {
                 Camera.MoveCamera(camMove);
             }
-            if (input.IsNewKeyPress(Keys.Home))
+            PlayerIndex i;
+            if (input.IsNewKeyPress(Keys.Home, PlayerIndex.One, out i))
             {
                 Camera.ResetCamera();
             }
 
         }
 
-        private void HandleUserAgent(InputHelper input)
+        private void HandleUserAgent(InputState input)
         {
 
-            Vector2 force = _agentForce * new Vector2(input.GamePadState.ThumbSticks.Right.X,
+            Vector2 force = _agentForce * new Vector2(input.CurrentGamePadStates[0].ThumbSticks.Right.X,
-                                                      -input.GamePadState.ThumbSticks.Right.Y);
+                                                      -input.CurrentGamePadStates[0].ThumbSticks.Right.Y);
-            float torque = _agentTorque * (input.GamePadState.Triggers.Right - input.GamePadState.Triggers.Left);
+            float torque = _agentTorque * (input.CurrentGamePadStates[0].Triggers.Right - input.CurrentGamePadStates[0].Triggers.Left);
 
             _userAgent.ApplyForce(force);
             _userAgent.ApplyTorque(torque);
@@ -281,27 +291,27 @@ namespace FarseerPhysics.SamplesFramework
             force = Vector2.Zero;
             torque = 0;
 
-            if (input.KeyboardState.IsKeyDown(Keys.A))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.A))
             {
                 force += new Vector2(-forceAmount, 0);
             }
-            if (input.KeyboardState.IsKeyDown(Keys.S))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.S))
             {
                 force += new Vector2(0, forceAmount);
             }
-            if (input.KeyboardState.IsKeyDown(Keys.D))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.D))
             {
                 force += new Vector2(forceAmount, 0);
             }
-            if (input.KeyboardState.IsKeyDown(Keys.W))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.W))
             {
                 force += new Vector2(0, -forceAmount);
             }
-            if (input.KeyboardState.IsKeyDown(Keys.Q))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.Q))
             {
                 torque -= _agentTorque;
             }
-            if (input.KeyboardState.IsKeyDown(Keys.E))
+            if (input.CurrentKeyboardStates[0].IsKeyDown(Keys.E))
             {
                 torque += _agentTorque;
             }

axios/ScreenSystem/PlayerIndexEventArgs.cs

@@ -0,0 +1,42 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// PlayerIndexEventArgs.cs
+//
+// XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using System;
+using Microsoft.Xna.Framework;
+#endregion
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// Custom event argument which includes the index of the player who
+    /// triggered the event. This is used by the MenuEntry.Selected event.
+    /// </summary>
+    public class PlayerIndexEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Constructor.
+        /// </summary>
+        public PlayerIndexEventArgs(PlayerIndex playerIndex)
+        {
+            this.playerIndex = playerIndex;
+        }
+
+
+        /// <summary>
+        /// Gets the index of the player who triggered this event.
+        /// </summary>
+        public PlayerIndex PlayerIndex
+        {
+            get { return playerIndex; }
+        }
+
+        PlayerIndex playerIndex;
+    }
+}

axios/ScreenSystem/ScreenManager.cs

@@ -0,0 +1,463 @@
+#region File Description
+//-----------------------------------------------------------------------------
+// ScreenManager.cs
+//
+// Microsoft XNA Community Game Platform
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//-----------------------------------------------------------------------------
+#endregion
+
+#region Using Statements
+using System;
+using System.Diagnostics;
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input.Touch;
+using System.IO;
+using System.IO.IsolatedStorage;
+using System.Xml.Linq;
+using FarseerPhysics.SamplesFramework;
+#endregion
+
+namespace GameStateManagement
+{
+    /// <summary>
+    /// The screen manager is a component which manages one or more GameScreen
+    /// instances. It maintains a stack of screens, calls their Update and Draw
+    /// methods at the appropriate times, and automatically routes input to the
+    /// topmost active screen.
+    /// </summary>
+    public class ScreenManager : DrawableGameComponent
+    {
+        #region Fields
+
+        private const string StateFilename = "ScreenManagerState.xml";
+
+        List<GameScreen> screens = new List<GameScreen>();
+        List<GameScreen> tempScreensList = new List<GameScreen>();
+
+        InputState input;
+
+        SpriteBatch spriteBatch;
+        SpriteFont font;
+        Texture2D blankTexture;
+
+        bool isInitialized;
+
+        bool traceEnabled;
+
+        /// <summary>
+        /// Contains all the fonts avaliable for use.
+        /// </summary>
+        private SpriteFonts _spriteFonts;
+
+        #endregion
+
+        #region Properties
+
+
+        public SpriteFonts Fonts
+        {
+            get { return _spriteFonts; }
+        }
+
+        /// <summary>
+        /// A default SpriteBatch shared by all the screens. This saves
+        /// each screen having to bother creating their own local instance.
+        /// </summary>
+        public SpriteBatch SpriteBatch
+        {
+            get { return spriteBatch; }
+        }
+
+
+        /// <summary>
+        /// A default font shared by all the screens. This saves
+        /// each screen having to bother loading their own local copy.
+        /// </summary>
+        public SpriteFont Font
+        {
+            get { return font; }
+        }
+
+
+        /// <summary>
+        /// If true, the manager prints out a list of all the screens
+        /// each time it is updated. This can be useful for making sure
+        /// everything is being added and removed at the right times.
+        /// </summary>
+        public bool TraceEnabled
+        {
+            get { return traceEnabled; }
+            set { traceEnabled = value; }
+        }
+
+
+        /// <summary>
+        /// Gets a blank texture that can be used by the screens.
+        /// </summary>
+        public Texture2D BlankTexture
+        {
+            get { return blankTexture; }
+        }
+
+
+        #endregion
+
+        #region Initialization
+
+
+        /// <summary>
+        /// Constructs a new screen manager component.
+        /// </summary>
+        public ScreenManager(Game game)
+            : base(game)
+        {
+            // we must set EnabledGestures before we can query for them, but
+            // we don't assume the game wants to read them.
+            TouchPanel.EnabledGestures = GestureType.None;
+            this.input = new InputState(this);
+        }
+
+
+        /// <summary>
+        /// Initializes the screen manager component.
+        /// </summary>
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            isInitialized = true;
+        }
+
+
+        /// <summary>
+        /// Load your graphics content.
+        /// </summary>
+        protected override void LoadContent()
+        {
+            // Load content belonging to the screen manager.
+            ContentManager content = new ContentManager(this.Game.Services, "Content/Fonts");
+            _spriteFonts = new SpriteFonts(content);
+            spriteBatch = new SpriteBatch(GraphicsDevice);
+            font = content.Load<SpriteFont>("menufont");
+            blankTexture = Game.Content.Load<Texture2D>("Materials/blank");
+            input.LoadContent();
+            // Tell each of the screens to load their content.
+            foreach (GameScreen screen in screens)
+            {
+                screen.Activate(false);
+            }
+        }
+
+
+        /// <summary>
+        /// Unload your graphics content.
+        /// </summary>
+        protected override void UnloadContent()
+        {
+            // Tell each of the screens to unload their content.
+            foreach (GameScreen screen in screens)
+            {
+                screen.Unload();
+            }
+        }
+
+
+        #endregion
+
+        #region Update and Draw
+
+
+        /// <summary>
+        /// Allows each screen to run logic.
+        /// </summary>
+        public override void Update(GameTime gameTime)
+        {
+            // Read the keyboard and gamepad.
+            input.Update(gameTime);
+
+            // Make a copy of the master screen list, to avoid confusion if
+            // the process of updating one screen adds or removes others.
+            tempScreensList.Clear();
+
+            foreach (GameScreen screen in screens)
+                tempScreensList.Add(screen);
+
+            bool otherScreenHasFocus = !Game.IsActive;
+            bool coveredByOtherScreen = false;
+
+            // Loop as long as there are screens waiting to be updated.
+            while (tempScreensList.Count > 0)
+            {
+                // Pop the topmost screen off the waiting list.
+                GameScreen screen = tempScreensList[tempScreensList.Count - 1];
+
+                tempScreensList.RemoveAt(tempScreensList.Count - 1);
+
+                // Update the screen.
+                screen.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
+
+                if (screen.ScreenState == ScreenState.TransitionOn ||
+                    screen.ScreenState == ScreenState.Active)
+                {
+                    // If this is the first active screen we came across,
+                    // give it a chance to handle input.
+                    if (!otherScreenHasFocus)
+                    {
+                        input.ShowCursor = screen.HasCursor;
+                        input.EnableVirtualStick = screen.HasVirtualStick;
+                        screen.HandleInput(gameTime, input);
+
+                        otherScreenHasFocus = true;
+                    }
+
+                    // If this is an active non-popup, inform any subsequent
+                    // screens that they are covered by it.
+                    if (!screen.IsPopup)
+                        coveredByOtherScreen = true;
+                }
+            }
+
+            // Print debug trace?
+            if (traceEnabled)
+                TraceScreens();
+        }
+
+
+        /// <summary>
+        /// Prints a list of all the screens, for debugging.
+        /// </summary>
+        void TraceScreens()
+        {
+            List<string> screenNames = new List<string>();
+
+            foreach (GameScreen screen in screens)
+                screenNames.Add(screen.GetType().Name);
+
+            Debug.WriteLine(string.Join(", ", screenNames.ToArray()));
+        }
+
+
+        /// <summary>
+        /// Tells each screen to draw itself.
+        /// </summary>
+        public override void Draw(GameTime gameTime)
+        {
+            
+            foreach (GameScreen screen in screens)
+            {
+                if (screen.ScreenState == ScreenState.Hidden)
+                    continue;
+
+                screen.Draw(gameTime);
+            }
+            input.Draw();
+        }
+
+
+        #endregion
+
+        #region Public Methods
+
+
+        /// <summary>
+        /// Adds a new screen to the screen manager.
+        /// </summary>
+        public void AddScreen(GameScreen screen, PlayerIndex? controllingPlayer)
+        {
+            screen.ControllingPlayer = controllingPlayer;
+            screen.ScreenManager = this;
+            screen.IsExiting = false;
+
+            // If we have a graphics device, tell the screen to load content.
+            if (isInitialized)
+            {
+                screen.Activate(false);
+            }
+
+            screens.Add(screen);
+
+            // update the TouchPanel to respond to gestures this screen is interested in
+            TouchPanel.EnabledGestures = screen.EnabledGestures;
+        }
+
+
+        /// <summary>
+        /// Removes a screen from the screen manager. You should normally
+        /// use GameScreen.ExitScreen instead of calling this directly, so
+        /// the screen can gradually transition off rather than just being
+        /// instantly removed.
+        /// </summary>
+        public void RemoveScreen(GameScreen screen)
+        {
+            // If we have a graphics device, tell the screen to unload content.
+            if (isInitialized)
+            {
+                screen.Unload();
+            }
+
+            screens.Remove(screen);
+            tempScreensList.Remove(screen);
+
+            // if there is a screen still in the manager, update TouchPanel
+            // to respond to gestures that screen is interested in.
+            if (screens.Count > 0)
+            {
+                TouchPanel.EnabledGestures = screens[screens.Count - 1].EnabledGestures;
+            }
+        }
+
+
+        /// <summary>
+        /// Expose an array holding all the screens. We return a copy rather
+        /// than the real master list, because screens should only ever be added
+        /// or removed using the AddScreen and RemoveScreen methods.
+        /// </summary>
+        public GameScreen[] GetScreens()
+        {
+            return screens.ToArray();
+        }
+
+
+        /// <summary>
+        /// Helper draws a translucent black fullscreen sprite, used for fading
+        /// screens in and out, and for darkening the background behind popups.
+        /// </summary>
+        public void FadeBackBufferToBlack(float alpha)
+        {
+            spriteBatch.Begin();
+            spriteBatch.Draw(blankTexture, GraphicsDevice.Viewport.Bounds, Color.Black * alpha);
+            spriteBatch.End();
+        }
+
+        /// <summary>
+        /// Informs the screen manager to serialize its state to disk.
+        /// </summary>
+        public void Deactivate()
+        {
+#if !WINDOWS_PHONE
+            return;
+#else
+            // Open up isolated storage
+            using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
+            {
+                // Create an XML document to hold the list of screen types currently in the stack
+                XDocument doc = new XDocument();
+                XElement root = new XElement("ScreenManager");
+                doc.Add(root);
+
+                // Make a copy of the master screen list, to avoid confusion if
+                // the process of deactivating one screen adds or removes others.
+                tempScreensList.Clear();
+                foreach (GameScreen screen in screens)
+                    tempScreensList.Add(screen);
+
+                // Iterate the screens to store in our XML file and deactivate them
+                foreach (GameScreen screen in tempScreensList)
+                {
+                    // Only add the screen to our XML if it is serializable
+                    if (screen.IsSerializable)
+                    {
+                        // We store the screen's controlling player so we can rehydrate that value
+                        string playerValue = screen.ControllingPlayer.HasValue
+                            ? screen.ControllingPlayer.Value.ToString()
+                            : "";
+
+                        root.Add(new XElement(
+                            "GameScreen",
+                            new XAttribute("Type", screen.GetType().AssemblyQualifiedName),
+                            new XAttribute("ControllingPlayer", playerValue)));
+                    }
+
+                    // Deactivate the screen regardless of whether we serialized it
+                    screen.Deactivate();
+                }
+
+                // Save the document
+                using (IsolatedStorageFileStream stream = storage.CreateFile(StateFilename))
+                {
+                    doc.Save(stream);
+                }
+            }
+#endif
+        }
+
+        public bool Activate(bool instancePreserved)
+        {
+#if !WINDOWS_PHONE
+            return false;
+#else
+            // If the game instance was preserved, the game wasn't dehydrated so our screens still exist.
+            // We just need to activate them and we're ready to go.
+            if (instancePreserved)
+            {
+                // Make a copy of the master screen list, to avoid confusion if
+                // the process of activating one screen adds or removes others.
+                tempScreensList.Clear();
+
+                foreach (GameScreen screen in screens)
+                    tempScreensList.Add(screen);
+
+                foreach (GameScreen screen in tempScreensList)
+                    screen.Activate(true);
+            }
+
+            // Otherwise we need to refer to our saved file and reconstruct the screens that were present
+            // when the game was deactivated.
+            else
+            {
+                // Try to get the screen factory from the services, which is required to recreate the screens
+                IScreenFactory screenFactory = Game.Services.GetService(typeof(IScreenFactory)) as IScreenFactory;
+                if (screenFactory == null)
+                {
+                    throw new InvalidOperationException(
+                        "Game.Services must contain an IScreenFactory in order to activate the ScreenManager.");
+                }
+
+                // Open up isolated storage
+                using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
+                {
+                    // Check for the file; if it doesn't exist we can't restore state
+                    if (!storage.FileExists(StateFilename))
+                        return false;
+
+                    // Read the state file so we can build up our screens
+                    using (IsolatedStorageFileStream stream = storage.OpenFile(StateFilename, FileMode.Open))
+                    {
+                        XDocument doc = XDocument.Load(stream);
+
+                        // Iterate the document to recreate the screen stack
+                        foreach (XElement screenElem in doc.Root.Elements("GameScreen"))
+                        {
+                            // Use the factory to create the screen
+                            Type screenType = Type.GetType(screenElem.Attribute("Type").Value);
+                            GameScreen screen = screenFactory.CreateScreen(screenType);
+
+                            // Rehydrate the controlling player for the screen
+                            PlayerIndex? controllingPlayer = screenElem.Attribute("ControllingPlayer").Value != ""
+                                ? (PlayerIndex)Enum.Parse(typeof(PlayerIndex), screenElem.Attribute("ControllingPlayer").Value, true)
+                                : (PlayerIndex?)null;
+                            screen.ControllingPlayer = controllingPlayer;
+
+                            // Add the screen to the screens list and activate the screen
+                            screen.ScreenManager = this;
+                            screens.Add(screen);
+                            screen.Activate(false);
+
+                            // update the TouchPanel to respond to gestures this screen is interested in
+                            TouchPanel.EnabledGestures = screen.EnabledGestures;
+                        }
+                    }
+                }
+            }
+
+            return true;
+#endif
+        }
+
+        #endregion
+    }
+}

axios/ScreenSystem/ScreenManagerComponent.cs

@@ -3,9 +3,11 @@ using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
 using Microsoft.Xna.Framework.Input.Touch;
+using FarseerPhysics.SamplesFramework;
 
-namespace FarseerPhysics.SamplesFramework
+namespace GameStateManagement
 {
+    /*
     /// <summary>
     /// The screen manager is a component which manages one or more GameScreen
     /// instances. It maintains a stack of screens, calls their Update and Draw
@@ -299,5 +301,5 @@ namespace FarseerPhysics.SamplesFramework
         {
             return _screens.ToArray();
         }
-    }
+    }*/
 }

axios/ScreenSystem/SpriteFonts.cs

@@ -11,9 +11,9 @@ namespace FarseerPhysics.SamplesFramework
 
         public SpriteFonts(ContentManager contentManager)
         {
-            MenuSpriteFont = contentManager.Load<SpriteFont>("Fonts/menuFont");
+            MenuSpriteFont = contentManager.Load<SpriteFont>("menuFont");
-            FrameRateCounterFont = contentManager.Load<SpriteFont>("Fonts/frameRateCounterFont");
+            FrameRateCounterFont = contentManager.Load<SpriteFont>("frameRateCounterFont");
-            DetailsFont = contentManager.Load<SpriteFont>("Fonts/detailsFont");
+            DetailsFont = contentManager.Load<SpriteFont>("detailsFont");
         }
     }
 }