variable listener

Is there any way to trigger an event if a variable from another scripts changes without calling it in update(). I would love to avoid calling everything in update.
In my case I have a time/date variable and I was wondering if there is a way for other scripts to see if the time was changed without using Update().

Thank you,
Hapciupalit

 

You can use a get set and run a function each time the value is set or have it fire a custom event.

 

Ok... and can put other scripts to listen to that event?

 

Ok course. This is one way you could do it, I wouldn't say its the best way as I'm no expert

The script containing the variable you want to monitor;

Code (CSharp):

1. using UnityEngine;
2.  
3. public class EventSender : MonoBehaviour
4. {
5.     private float _myFloat = 0f;
6.  
7.     public event OnVariableChangeDelegate OnVariableChange;
8.     public delegate void OnVariableChangeDelegate(float newVal);
9.  
10.     public float MyFloat
11.     {
12.         get
13.         {
14.             return _myFloat;
15.         }
16.         set
17.         {
18.             if (_myFloat == value) return;
19.             _myFloat = value;
20.             if (OnVariableChange != null)
21.                 OnVariableChange(_myFloat);
22.         }
23.     }
24. }
25.  

The script containing the code you wish to listen for changes in your variable;

Code (CSharp):

1. using UnityEngine;
2.  
3. public class EventListener : MonoBehaviour
4. {
5.     private EventSender _eventSender;
6.  
7.     void Start()
8.     {
9.  
10.         _eventSender = GameObject.FindObjectOfType<EventSender>();
11.  
12.         _eventSender.OnVariableChange += VariableChangeHandler;
13.     }
14.  
15.     private void VariableChangeHandler(float newVal)
16.     {
17.         Debug.Log("Event Fired. MyFloat = " + newVal);
18.     }
19.  
20.     private void Update()
21.     {
22.         //For Testing
23.         if (Input.GetKeyDown(KeyCode.DownArrow))
24.         {
25.             _eventSender.MyFloat -= 0.5f;
26.         }
27.         else if (Input.GetKeyDown(KeyCode.UpArrow))
28.         {
29.             _eventSender.MyFloat += 0.5f;
30.         }
31.     }
32. }

 

Thank you very much. This is just perfect. For me as long as it works ... I don't care if it's the best solution.

 

This looks pretty useful but I cant get worked that. Even when I use exact same code I do receive nothing, even no feedback and no error.

its an old post but if you guys are still alive, can you please help me.

thanks