XInputGamepadManager.cs

using Gondwana.Input.Gamepad;
using Microsoft.Extensions.Logging;
using static Gondwana.WinForms.Input.Gamepad.XInput.XInput;
 
namespace Gondwana.WinForms.Input.Gamepad.XInput;

public sealed class XInputGamepadManager : IGamepadManager<XInputGamepadAdapter>
{
    public static XInputGamepadManager? Instance { get; private set; }
 
    private XInputGamepadManager()
    {
        Engine.Logger.LogInformation("XInputGamepadManager initialized. Starting to poll gamepads.");
    }

    public static XInputGamepadManager Start()
    {
        if (Instance is not null)
            return Instance;
 
        return Instance = new XInputGamepadManager();
    }

    public static void Stop()
    {
        Engine.Logger.LogInformation("Stopping XInputGamepadManager and removing all XInputGamepadAdapter instances.");
        Instance = null;
    }
 
    private readonly Dictionary<int, XInputGamepadAdapter> _activeAdapters = new();

    public IReadOnlyCollection<XInputGamepadAdapter> ConnectedAdapters => _activeAdapters.Values;

    public void UpdateConnections()
    {
        for (int i = 0; i < 4; i++)
        {
            bool isConnected = GetState(i, out _) == 0;
 
            if (isConnected)
            {
                if (!_activeAdapters.ContainsKey(i))
                    _activeAdapters[i] = new XInputGamepadAdapter(i);
            }
            else
            {
                _activeAdapters.Remove(i);
            }
        }
    }

    public void Poll()
    {
        foreach (var adapter in _activeAdapters.Values)
            adapter.Poll();
    }

    [Obsolete("Use UpdateConnections() and Poll() separately.")]
    public void Update()
    {
        UpdateConnections();
        Poll();
    }
}