Carnac.Logic/KeyMonitor/InterceptKeys.cs

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using System;
using System.Diagnostics;
using System.Reactive.Subjects;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Windows.Forms;

namespace Carnac.Logic.KeyMonitor
{
    [PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")]
    [PermissionSet(SecurityAction.InheritanceDemand, Name="FullTrust")]
    public class InterceptKeys : IObservable<InterceptKeyEventArgs>, IDisposable
    {
        static volatile InterceptKeys current;
        static readonly object CurrentLock = new object();
        readonly Win32Methods.LowLevelKeyboardProc callback;
        readonly Subject<InterceptKeyEventArgs> subject;
        bool disposed;
        IntPtr hookId = IntPtr.Zero;
        decimal subscriberCount;

        InterceptKeys()
        {
            subject = new Subject<InterceptKeyEventArgs>();
            callback = HookCallback;
        }

        public static InterceptKeys Current
        {
            get
            {
                if (current == null)
                {
                    lock (CurrentLock)
                    {
                        if (current == null)
                        {
                            current = new InterceptKeys();
                        }
                    }
                }
                return current;
            }
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        public IDisposable Subscribe(IObserver<InterceptKeyEventArgs> observer)
        {
            Debug.WriteLine("Subscribed");
            IDisposable dispose = subject.Subscribe(observer);
            subscriberCount++;
            if (subscriberCount == 1)
                hookId = SetHook(callback);
            return new DelegateDisposable(() =>
                                              {