Shared Variable Change Notification

[Ruka]

Hello!
I've looked through the docs a few times and can't seem to find what I am looking for. As far as I know, shared variables are just properties. So, would it be possible to set up a C# event that reacts to a shared variable changing (being set)? Seems like a quick OnValueChanged event would be more efficient than checking the variable every frame to see if it has changed.
Thank you for your time,
-Luka

 

[Justin]

What is your goal? SharedVariables are classes and not just properties, maybe you are referring to property mappings?

 

[Ruka]

What is your goal? SharedVariables are classes and not just properties, maybe you are referring to property mappings?

My goal is to have a shared variable like health for instance, and have an event that other classes could subscribe to when that shared variable changes. So a health shared variable could send an event to a number of classes to notify them that it has changed. One might go to the UI to update the value, another might go to a class that's responsible for playing different particle effects if the character is hurt or healed etc.

Property maps could work for this, but as I understand, it requires making a duplicate property in the other class, and that may not be desirable if I want to have many systems all responding to many shared variables. That feels like a lot of duplication for a scenario where I simply want to pass a value. I'm still relatively new to C# so if I'm thinking about this wrong, please let me know!

Edit: I was also meaning to ask, if you map a shared variable like a vector3 to a transform's position, or just a general property that you've set up in a class, does that use reflection? I was assuming it does since the get/set property value task is also listed as reflection, but wanted to make sure.

 

[Justin]

Ah, I see. There are multiple ways a SharedVariable can be set:

- The Value property
- Property Mappings
- SharedVariable.SetValue

There isn't an event system with any of these but you could import the runtime source and add one.

Edit: I was also meaning to ask, if you map a shared variable like a vector3 to a transform's position, or just a general property that you've set up in a class, does that use reflection? I was assuming it does since the get/set property value task is also listed as reflection, but wanted to make sure.

Yes, it does. But it's a one time hit because it creates a delegate which is fast.