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branch : axios-newgsm
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nathan@daedalus
2012-04-12 22:20:50 -05:00
parent 4057123b6e
commit a93df07c6e
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191
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#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);
}
}
}

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#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
}
}

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#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);
}
}

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#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;
}
}
}

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#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.Input;
using Microsoft.Xna.Framework.Input.Touch;
using FarseerPhysics.SamplesFramework;
namespace GameStateManagement
{
/// <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
*/
/*
*
*
*
*
*
*/
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>();
/// <summary>
/// Constructs a new input state.
/// </summary>
public InputState()
{
CurrentKeyboardStates = new KeyboardState[MaxInputs];
CurrentGamePadStates = new GamePadState[MaxInputs];
LastKeyboardStates = new KeyboardState[MaxInputs];
LastGamePadStates = new GamePadState[MaxInputs];
GamePadWasConnected = new bool[MaxInputs];
}
/// <summary>
/// Reads the latest state user input.
/// </summary>
public void Update()
{
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)
{
Gestures.Add(TouchPanel.ReadGesture());
}
}
/// <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));
}
}
/// <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));
}
}
}
}

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#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
}
}

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#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;
#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
}
}

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#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
}
}

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#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
}
}

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#region File Description
//-----------------------------------------------------------------------------
// PhoneMainMenuScreen.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#endregion
using System;
using GameStateManagement;
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();
}
}
}

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#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);
}
}
}

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#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();
}
}
}

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#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>
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;
}
}

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#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;
#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 = new InputState();
SpriteBatch spriteBatch;
SpriteFont font;
Texture2D blankTexture;
bool isInitialized;
bool traceEnabled;
#endregion
#region Properties
/// <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;
}
/// <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 = Game.Content;
spriteBatch = new SpriteBatch(GraphicsDevice);
font = content.Load<SpriteFont>("menufont");
blankTexture = content.Load<Texture2D>("blank");
// 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();
// 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)
{
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);
}
}
#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
}
}