Add events that fire before components are activated

Summary

In order to integrate Singularity with duality I would like the dependencies to be injected before components are activated. Currently duality does not provide a event for this.

Iam currently using Scene.ComponentAdded and Scene.Entered for this purpose except for the fact they fire after component activation.

Analysis

• Can be used to do quite neat stuff such as IOC
• Like all things can also be abused.

[Barsonax]

Ah ok makes sense. Not sure how you could word it better than what you did.

Before we start adding events all over the place let me clarify why I have a need for these events in the first place. Normally with DI constructor injection is preferred. However I do not know if this is possible in duality as duality itself calls these constructors. This is why I went for plan B and wanted to do it through method injection using those events. If you think constructor injection is still possible (maybe I can hook into the component creation logic somehow?) then I would prefer that route ofcourse.

Just FYI so I don’t keep thinking inside this event solution box.

EDIT: Found the logic creating the instances in ObjectCreator and in GameObject.AddComponent. Without engine modifications it doesn’t seem to be possible to put custom logic in here.

EDIT2: If we decide to change the logic here its not needed to change the current GameObject.AddComponent at all. You can make a new extension method that will be used when the type has a constructor with parameters (only works in C#7.3!):

class Program
{
	static void Main(string[] args)
	{
		var gameObject = new GameObject();
		gameObject.AddComponent<Program>();
		gameObject.AddComponent<ClassWithConstructorArguments>();
	}
}

public class ClassWithConstructorArguments
{
	public ClassWithConstructorArguments(int foo)
	{

	}
}

public static class GameObjectExtensions
{
	public static void AddComponent<T>(this GameObject gameObject) where T : class
	{
		//Will handle any types that don't fit the new() constraint
	}
}

public class GameObject
{
	public void AddComponent<T>() where T : class, new()
	{
		//The fast happy path
	}
}

[Barsonax]

Ill release Singularity as a v0 version then with the warning this issue is yet to addressed