Question by m0nkeybl1tz · Mar 28, 2019 at 05:37 PM · c#event

Best way to implement a radio button style system (without using Unity UI)

I'm creating a menu system for our game, but rather than using a 2D menu it's all 3D buttons. For one menu I want to have it be a radio button-style selection system: if you click on one button, it automatically deselects all other buttons. I'm wondering if there's a best practice for implementing a system like this.

I figure you could have a button manager and have each button call a function on it when the button is clicked, telling it to uncheck every other button. However this would force each button to have a reference to the manager, so it feels kind of inelegant. Is there a better way? Maybe with an event system or something?

Thanks!

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mchts · Mar 29, 2019 at 09:09 PM 0

I could suggest an event system as you implied:

 //This script is for observing radio button clicks. Attach this to any gameobject
 public class ToggleEventSystem : $$anonymous$$onoBehaviour {
 
     public delegate void radioToggleDelegate(RadioButton rb, bool b);
     public static event radioToggleDelegate radioToggleEvent;
 
     public static void RadioButtonToggled(RadioButton rb, bool b) {
         if (radioToggleEvent != null) {
             radioToggleEvent(rb, b);
         }
     }
 
     private void Update() {
         if (Input.touchCount > 0) { //i assume platform is mobile. You could use Input.mousePosition ins$$anonymous$$d if you work with standalone 
             RadioButton button = ControlHit(Input.GetTouch(0).position); 
             if (button != null) {
                 RadioButtonToggled(button, true);
             }
         }
     }
     private RadioButton ControlHit(Vector3 touchPos) {
         Ray ray = Camera.main.ScreenPointToRay(touchPos);
         RaycastHit hit;
         Physics.Raycast(ray, out hit);
         if (hit.collider != null) {
             return hit.collider.gameObject.GetComponent<RadioButton>();
         }
         return null;
     }
 }
 
 //this script here is base class for registering toggle events
 public abstract class ToggleButton : $$anonymous$$onoBehaviour {
 
     private void OnEnable() {
         Test.radioToggleEvent += OnToggle;
     }
 
     private void OnDisable() {
         Test.radioToggleEvent -= OnToggle;
     }
 
     public abstract void OnToggle(RadioButton rb, bool b);
 }
 
 //this is the actual radio button script to attach each toggle button.
 public class RadioButton : ToggleButton {
 
     public bool isToggled;
 
     private void Start() {
         isToggled = false;
     }
 
     //this method will be triggered for each radio button whenever one of them clicked
     public override void OnToggle(RadioButton rb, bool b) {
         isToggled = rb.Equals(this); //if toggled button is this one then toggle this button on, else off
         //you can do visual arrangements here 
     }
 }