64 lines
1.8 KiB
C#
64 lines
1.8 KiB
C#
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using System;
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using System.Collections.Generic;
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namespace BulletHellTemplate.Core.Events
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{
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/// <summary>
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/// Simple global event bus that allows publishing and subscribing to strongly typed events.
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/// </summary>
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public static partial class EventBus
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{
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private static readonly Dictionary<Type, List<Delegate>> _subscribers = new();
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/// <summary>
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/// Subscribe to a specific event type.
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/// </summary>
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public static void Subscribe<T>(Action<T> callback)
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{
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var type = typeof(T);
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if (!_subscribers.ContainsKey(type))
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_subscribers[type] = new List<Delegate>();
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_subscribers[type].Add(callback);
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}
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/// <summary>
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/// Unsubscribe from a specific event type.
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/// </summary>
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public static void Unsubscribe<T>(Action<T> callback)
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{
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var type = typeof(T);
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if (_subscribers.TryGetValue(type, out var list))
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{
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list.Remove(callback);
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if (list.Count == 0)
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_subscribers.Remove(type);
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}
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}
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/// <summary>
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/// Publish an event to all listeners of the event type.
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/// </summary>
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public static void Publish<T>(T publishedEvent)
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{
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var type = typeof(T);
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if (_subscribers.TryGetValue(type, out var list))
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{
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foreach (var callback in list)
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{
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if (callback is Action<T> action)
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action.Invoke(publishedEvent);
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}
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}
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}
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/// <summary>
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/// Clears all subscribers from the bus. Use carefully!
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/// </summary>
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public static void ClearAll()
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{
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_subscribers.Clear();
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}
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}
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}
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