Make Button to Pop Up Window

Sir i want to make About button, but when i click the windows does not appear

I have code like this, the About button appear on start but when i click the window don't appear
Am i missing something?

Code (CSharp):

1. public Rect windowRect0 = new Rect(20, 20, 120, 50);
2.    
3.     void OnGUI() {
4.  
5.         if(GUI.Button(new Rect(10,20,100,20), "About"))
6.         {
7.             windowRect0 = GUI.Window(0, windowRect0,DoMyWindow,"About");
8.         }
9.  
10.         //windowRect1 = GUI.Window(1, windowRect1, DoMyWindow, "My Window");
11.     }
12.     void DoMyWindow(int windowID) {
13.         GUI.Label(new Rect(20, 20, 100, 20), "Vers. 1");
14.         if (GUI.Button (new Rect (30, 20, 100, 20), "Close"))
15.             Destroy (this);
16.      
17.         GUI.DragWindow(new Rect(0, 0, 10000, 10000));
18.     }
19.  

 

The issue here is that the window is only drawn during the frame you clicked the button (the moment you release it, I believe). As this is only true for a single frame, it is quite hard to spot that it actually draws it.

My advice is to also keep track of a bool(ean) which is responsible for determining whehter the window should be drawn. Set the bool to true if the "About"-button is pressed. Then - outside of the button's if - test whether the bool is true, if so: draw the window.

On another note, I am not quite sure about the usage of destroy in this context. I assume you want to use it to close the "About"-window, in which case you could better set the just introduced bool to false; that way you can open it again should you so desire.

Spoiler: Code sample

Slight notice regarding the code, it is untested; so it might contain a bug. In any case here you go.

Code (CSharp):

1. private Rect windowRect0 = new Rect(20, 20, 120, 50);
2. private bool showWindow = false;
3.  
4. void OnGUI()
5. {
6.     if(GUI.Button(new Rect(10,20,100,20), "About"))
7.         showWindow = true;  
8.  
9.     if (showWindow)
10.     {
11.         windowRect0 = GUI.Window(0, windowRect0,DoMyWindow,"About");
12.     }
13. }
14.  
15. void DoMyWindow(int windowID)
16. {
17.     GUI.Label(new Rect(20, 20, 100, 20), "Vers. 1");
18.     if (GUI.Button (new Rect (30, 20, 100, 20), "Close"))
19.         showWindow = false;
20.    
21.     GUI.DragWindow(new Rect(0, 0, 10000, 10000));
22. }

 

oh i'm missing boolean, thank you for reply sir, really helpful. Thanks now my windows worked, perfectly