EffectManager.cs

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using System.Collections.Generic;
using Microsoft.Xna.Framework;
 
namespace Terraria.Graphics.Effects;
 
public abstract class EffectManager<T> where T : GameEffect
{
    protected bool _isLoaded;
 
    protected Dictionary<string, T> _effects = new Dictionary<string, T>();
 
    public bool IsLoaded => _isLoaded;
 
    public T this[string key]
    {
        get
        {
            if (_effects.TryGetValue(key, out var value))
            {
                return value;
            }
            return null;
        }
        set
        {
            Bind(key, value);
        }
    }
 
    public void Bind(string name, T effect)
    {
        _effects[name] = effect;
        if (_isLoaded)
        {
            effect.Load();
        }
    }
 
    public void Load()
    {
        if (_isLoaded)
        {
            return;
        }
        _isLoaded = true;
        foreach (T value in _effects.Values)
        {
            value.Load();
        }
    }
 
    public T Activate(string name, Vector2 position = default(Vector2), params object[] args)
    {
        if (!_effects.ContainsKey(name))
        {
            throw new MissingEffectException(string.Concat("Unable to find effect named: ", name, ". Type: ", typeof(T), "."));
        }
        T val = _effects[name];
        OnActivate(val, position);
        val.Activate(position, args);
        return val;
    }
 
    public void Deactivate(string name, params object[] args)
    {
        if (!_effects.ContainsKey(name))
        {
            throw new MissingEffectException(string.Concat("Unable to find effect named: ", name, ". Type: ", typeof(T), "."));
        }
        T val = _effects[name];
        OnDeactivate(val);
        val.Deactivate(args);
    }
 
    public virtual void OnActivate(T effect, Vector2 position)
    {
    }
 
    public virtual void OnDeactivate(T effect)
    {
    }
}