C:/Users/Andreas Schiffler/Desktop/SVN/NewGamePhysics/GravityChooser/Screens/GravityChooserMessageBoxScreen.cs

#region File Description
//-----------------------------------------------------------------------------
// GravityChooserMessageBoxScreen.cs
// (A. Schiffler, 2009-2011)
//-----------------------------------------------------------------------------
#endregion

namespace GravityChooser
{
    using System;
    using Microsoft.Xna.Framework;
    using Microsoft.Xna.Framework.Content;
    using Microsoft.Xna.Framework.Graphics;
    using NewGamePhysics.StateManager;
    
    class GravityChooserMessageBoxScreen : GameScreen
    {
        #region Fields

        string message;

        Texture2D gradientTexture;

        #endregion

        #region Events

        public event EventHandler<PlayerIndexEventArgs> Accepted;

        public event EventHandler<PlayerIndexEventArgs> Cancelled;

        #endregion

        #region Initialization

        public GravityChooserMessageBoxScreen(string message)
            : this(message, true)
        { }

        public GravityChooserMessageBoxScreen(string message, bool includeUsageText)
        {
            const string usageText = "\nOK      : (A) button or [Enter]" +
                                     "\nCancel  : (B) button or [Esc]";

            if (includeUsageText)
            {
                this.message = message + usageText;
            }
            else
            {
                this.message = message;
            }

            IsPopup = true;

            TransitionOnTime = TimeSpan.FromSeconds(0.2);
            TransitionOffTime = TimeSpan.FromSeconds(0.2);
        }


        public override void LoadContent()
        {
            ContentManager content = ScreenManager.Game.Content;

            gradientTexture = content.Load<Texture2D>(@"Sprites\gradient");
        }

        #endregion

        #region Handle Input

        public override void HandleInput(InputState input)
        {
            PlayerIndex playerIndex;

            // We pass in our ControllingPlayer, which may either be null (to
            // 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 (input.IsMenuSelect(ControllingPlayer, out playerIndex))
            {
                // Raise the accepted event, then exit the message box.
                if (Accepted != null)
                    Accepted(this, new PlayerIndexEventArgs(playerIndex));

                ExitScreen();
            }
            else if (input.IsMenuCancel(ControllingPlayer, out playerIndex))
            {
                // Raise the cancelled event, then exit the message box.
                if (Cancelled != null)
                    Cancelled(this, new PlayerIndexEventArgs(playerIndex));

                ExitScreen();
            }
        }


        #endregion

        #region Draw

        public override void Draw(GameTime gameTime)
        {
            SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
            SpriteFont font = ScreenManager.Fonts["menu"];

            // 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 = new Color(255, 255, 255, TransitionAlpha);

            spriteBatch.Begin();

            // Draw the background rectangle.
            spriteBatch.Draw(gradientTexture, backgroundRectangle, color);

            // Draw the message box text.
            spriteBatch.DrawString(font, message, textPosition, color);

            spriteBatch.End();
        }

        #endregion
    }
}

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