Can't add a GUI in C#??

Question

OK I am a noob with GUIs in C# (mostly C# in general) and I'm trying to add an "about" page to my game. I have GUILayout.label for my button, but I can't add another one for the actual text for the about page. I want to get it to where I can show the text from a txt file (I know about text assets) and that's not the problem. The problem is that I can't add the new GUI that shows the information after I click the about button. Here's my code:

void OnGUI() { if (isLocked == false) { GUILayout.BeginArea (new Rect (0, 0, Screen.width, Screen.height)); GUILayout.BeginHorizontal (); GUILayout.FlexibleSpace (); GUILayout.BeginVertical (); GUILayout.FlexibleSpace (); GUI.skin = buttonSkinThing; if (GUILayout.Button ("About", "label")) { GUILayout.FlexibleSpace(); GUILayout.EndHorizontal(); GUILayout.FlexibleSpace(); GUILayout.EndVertical(); GUILayout.FlexibleSpace(); [Whatever GUIText here to show text from file/about page] Time.timeScale = 1; Debug.Log ("Resume Game"); } if (GUILayout.Button ("Exit", "label")) { Debug.Log ("Exit Game"); } GUILayout.FlexibleSpace (); GUILayout.EndHorizontal (); GUILayout.FlexibleSpace (); GUILayout.EndVertical (); GUILayout.EndArea (); } else { Debug.Log ("CRAP"); } }

I know that some of it is junk like the flexible spaces and the endhorizontals, but all I need is for it to have a button that I can click that says "about". WHen I click that, I want it to go away and show another GUI with the text in a txt file. Anyone know why I'm messing this up?

Answer 1

OnGui() is called constantly, so to change the GUIs displayed you will have to set up what is known as a state machine. This will allow you to display different GUIs based off of the current state of your application. Below is a simplified example of what you would probably want to implement.

 enum CurrentState = State.MainMenu;
 
 enum State {
     MainMenu = 0,
     About = 1,
     Gameplay = 2
 }
 
 void OnGUI() {
     if(CurrentState == State.MainMenu;) {
         // All your other main menu GUIs
         if (GUILayout.Button ("About", "label")) {
             Debug.Log ("About State");
             CurrentState = State.About;
         }
     }
     else if(CurrentState == State.About){
         // Show the about screen
         if (GUILayout.Button ("Exit", "label")) {
             Debug.Log ("Returning to menu");
             CurrentState = State.MainMenu;
         }
     }
     else if(CurrentState == State.Gameplay){
         // Show ingame GUIs
     }
 }

A cleaner version would be to use a case statement instead of a bunch of if else statements.

 enum CurrentState = State.MainMenu;
 
 enum State {
     MainMenu = 0,
     About = 1,
     Gameplay = 2
 }
 
 void OnGUI() {
     switch(CurrentState)
     {
         case State.MainMenu:
             MainMenuGUI();
             break;
         case State.About:
             AboutGUI();
             break;
         default:
             Debug.Log("NO CURRENT STATE");
             break;
     }
 }
 
 void MainMenuGUI() {
     // Main menu GUI code here
 }
 
 void AboutGUI() {
     // About menu GUI code here
 }

Can't add a GUI in C#??

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