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POLimiting actions under state events c#
 

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    <p>I am trying to create a screenManager that can open and close multiple screens at a time. I have bound the P key to open a screen called Pause when pressed. However, in a debug statement i can see that the screen is being created and opened multiple times with the press of the P key. I can stop this by checking if the screen variable is null or not before creating/adding it to the screen list. Then, though, I get a StackOverflow exception when trying to dispose of it. Her eis my code:</p> <p>Pause.cs- If I dont call Dispose() here I am unable to reopen the screen in MainMenu because Pause is no longer null.</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Content; namespace RoomGame { public class Screen : IDisposable { public ScreenController screenController; public bool isUpdating=true; public bool isDrawn=true; public GraphicsDeviceManager graphics; /*public Screen(ScreenController sc) { this.screenController = sc; this.isActive = true; }*/ public virtual void Initialize() { } public virtual void LoadContent(ContentManager c) { } public virtual void Update(GameTime gameTime) { } public virtual void Draw(GameTime gameTime,SpriteBatch sb) { } public void Dispose() { this.Dispose(); } } } </code></pre> <p>Screen.cs - The StackOVerflow exception occurs in Dispose here</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Content; namespace RoomGame { public class Screen : IDisposable { public ScreenController screenController; public bool isUpdating=true; public bool isDrawn=true; public GraphicsDeviceManager graphics; /*public Screen(ScreenController sc) { this.screenController = sc; this.isActive = true; }*/ public virtual void Initialize() { } public virtual void LoadContent(ContentManager c) { } public virtual void Update(GameTime gameTime) { } public virtual void Draw(GameTime gameTime,SpriteBatch sb) { } public void Dispose() { this.Dispose(); } } } </code></pre> <p>MainMenu.cs - This is the class that creates the Pause screen</p> <pre><code>using System.Linq; using System.Text; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Content; using Microsoft.Xna.Framework.Input; namespace RoomGame { public class MainMenu : Screen { GameController gameController; ScreenController screenController; MyTexture start; Rectangle area; Vector2 position; ContentManager content; Screen pause = null; //public GraphicsDeviceManager graphics; public MainMenu(GameController gc) { this.gameController = gc; gameController.Game.IsMouseVisible = true; //this.content = c; this.isUpdating = true; this.isDrawn = true; //this.graphics = this.gameController.game.graphics; } public override void LoadContent(ContentManager c) { position = new Vector2(100, 100); start = new MyTexture("Textures/Start",position,c); //texture = this.gameController.game.Content.Load&lt;Texture2D&gt;("Textures/Start"); //texture=this.gameController.content.Load&lt;Texture2D&gt;("Textures/Start"); //texture = this.gameController.Game.Content.Load&lt;Texture2D&gt;("Textures/Start"); } public override void Update(GameTime gameTime) { //texture = this.gameController.content.Load&lt;Texture2D&gt;("Textures/Start"); area = start.getBounds(); MouseState mouse = Mouse.GetState(); if ((mouse.LeftButton == ButtonState.Pressed) &amp;&amp; (area.Contains(mouse.X, mouse.Y))) { gameController.Game.Exit(); } KeyboardState key = Keyboard.GetState(); if (key.IsKeyDown(Keys.P)) { if (pause == null) { pause = new Pause(this.gameController); gameController.screenController.AddScreen(pause); } } } public override void Draw(GameTime gameTime,SpriteBatch sb) { start.Draw(sb); } } } </code></pre> <p>EDIT: My mistake. The debug state was in the wrong place so while it was showing multiple adds the List.Contains statement was preventing it from acctually happening.</p>
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