Start void on variable value changed.

[Karma_XX]

Hello,
I would like to be able to start a void everytime the value of a variable under a certain script changes, and if possible, even send which variable changed to the void.

Like in this photo. When the height changes, a script should detect this change and start a void by sending which variable value changed.

Thank you.

[spiney199]

First thing to note that ‘void’ is the return type of a method/function that returns nothing. Call them methods in the context of C#.

What you’re asking for is called a ‘callback’, which is best accomplished in C# with something called a delegate.

Though it’s easiest to use the pre-supplied delegates such as System.Action.

Basic example:

public class MainObject : Monobehaviour
{
    [SerializeField]
    private string _name;
   
    public string Name
    {
        get => _name;
        set
        {
            _name = value;
            OnNameChanged?.Invoke(_name);
        }
    }
   
    public event Action<string> OnNameChanged;
}

// usage
mainObject.OnNameChanged += PrintNewName;
mainObject.Name = "New Name";

private void PrintNewName(string name)
{
    Debug.Log("New name is: " + name);
}

Spend some time learning how to use delegates, as they are getting into strong intermediate territory.

[QuinnWinters]

Though spiney’s suggestion is the better route, another option is the following. As the saying goes, there are many ways to skin a cat.

public OcTree ocTree;
float ocTreeHeight;

void Start () {
    ocTreeHeight = ocTree.height;
}

void Update () {
    if (ocTreeHeight != ocTree.height) {
        ocTreeHeight = ocTree.height;
        PrintHeight (ocTree.height);
    }
}

void PrintHeight (float height) {
    print (height);
}

[Karma_XX]

Thank you both