115 lines
3.6 KiB
C#
115 lines
3.6 KiB
C#
#region File Description
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//-----------------------------------------------------------------------------
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// BackgroundScreen.cs
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//
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// Microsoft XNA Community Game Platform
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// Copyright (C) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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#endregion
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#region Using Statements
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using System;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Content;
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using Microsoft.Xna.Framework.Graphics;
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using GameStateManagement;
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#endregion
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namespace GameStateManagement
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{
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/// <summary>
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/// The background screen sits behind all the other menu screens.
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/// It draws a background image that remains fixed in place regardless
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/// of whatever transitions the screens on top of it may be doing.
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/// </summary>
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class BackgroundScreen : GameScreen
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{
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#region Fields
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ContentManager content;
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Texture2D backgroundTexture;
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#endregion
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#region Initialization
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/// <summary>
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/// Constructor.
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/// </summary>
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public BackgroundScreen()
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{
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TransitionOnTime = TimeSpan.FromSeconds(0.5);
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TransitionOffTime = TimeSpan.FromSeconds(0.5);
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}
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/// <summary>
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/// Loads graphics content for this screen. The background texture is quite
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/// big, so we use our own local ContentManager to load it. This allows us
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/// to unload before going from the menus into the game itself, wheras if we
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/// used the shared ContentManager provided by the Game class, the content
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/// would remain loaded forever.
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/// </summary>
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public override void Activate(bool instancePreserved)
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{
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if (!instancePreserved)
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{
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if (content == null)
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content = new ContentManager(ScreenManager.Game.Services, "Content");
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backgroundTexture = content.Load<Texture2D>("background");
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}
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}
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/// <summary>
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/// Unloads graphics content for this screen.
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/// </summary>
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public override void Unload()
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{
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content.Unload();
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}
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#endregion
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#region Update and Draw
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/// <summary>
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/// Updates the background screen. Unlike most screens, this should not
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/// transition off even if it has been covered by another screen: it is
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/// supposed to be covered, after all! This overload forces the
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/// coveredByOtherScreen parameter to false in order to stop the base
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/// Update method wanting to transition off.
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/// </summary>
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public override void Update(GameTime gameTime, bool otherScreenHasFocus,
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bool coveredByOtherScreen)
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{
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base.Update(gameTime, otherScreenHasFocus, false);
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}
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/// <summary>
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/// Draws the background screen.
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/// </summary>
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public override void Draw(GameTime gameTime)
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{
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SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
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Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
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Rectangle fullscreen = new Rectangle(0, 0, viewport.Width, viewport.Height);
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spriteBatch.Begin();
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spriteBatch.Draw(backgroundTexture, fullscreen,
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new Color(TransitionAlpha, TransitionAlpha, TransitionAlpha));
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spriteBatch.End();
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}
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#endregion
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}
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}
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