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using System;
using System.Runtime.InteropServices;
namespace Steamworks;
public abstract class Callback
{
public abstract bool IsGameServer { get; }
internal abstract Type GetCallbackType();
internal abstract void OnRunCallback(IntPtr pvParam);
internal abstract void SetUnregistered();
}
public sealed class Callback<T> : Callback, IDisposable
{
public delegate void DispatchDelegate(T param);
private bool m_bGameServer;
private bool m_bIsRegistered;
private bool m_bDisposed;
public override bool IsGameServer => m_bGameServer;
private event DispatchDelegate m_Func;
public static Callback<T> Create(DispatchDelegate func)
{
return new Callback<T>(func);
}
public static Callback<T> CreateGameServer(DispatchDelegate func)
{
return new Callback<T>(func, bGameServer: true);
}
public Callback(DispatchDelegate func, bool bGameServer = false)
{
m_bGameServer = bGameServer;
Register(func);
}
~Callback()
{
Dispose();
}
public void Dispose()
{
if (!m_bDisposed)
{
GC.SuppressFinalize(this);
if (m_bIsRegistered)
{
Unregister();
}
m_bDisposed = true;
}
}
public void Register(DispatchDelegate func)
{
if (func == null)
{
throw new Exception("Callback function must not be null.");
}
if (m_bIsRegistered)
{
Unregister();
}
this.m_Func = func;
CallbackDispatcher.Register(this);
m_bIsRegistered = true;
}
public void Unregister()
{
CallbackDispatcher.Unregister(this);
m_bIsRegistered = false;
}
internal override Type GetCallbackType()
{
return typeof(T);
}
internal override void OnRunCallback(IntPtr pvParam)
{
try
{
this.m_Func((T)Marshal.PtrToStructure(pvParam, typeof(T)));
}
catch (Exception e)
{
CallbackDispatcher.ExceptionHandler(e);
}
}
internal override void SetUnregistered()
{
m_bIsRegistered = false;
}
}
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