src/Carnac.Logic/KeyProvider.cs

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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Reactive.Disposables;
using System.Reactive.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Carnac.Logic.KeyMonitor;
using Carnac.Logic.Models;
using Microsoft.Win32;
using System.Windows.Media;

namespace Carnac.Logic
{
    public class KeyProvider : IKeyProvider
    {
        readonly IInterceptKeys interceptKeysSource;
        readonly Dictionary<int, Process> processes;
        readonly IPasswordModeService passwordModeService;
        readonly IDesktopLockEventService desktopLockEventService;

        private readonly IList<Keys> modifierKeys =
            new List<Keys>
                {
                    Keys.LControlKey,
                    Keys.RControlKey,
                    Keys.LShiftKey,
                    Keys.RShiftKey,
                    Keys.LMenu,
                    Keys.RMenu,
                    Keys.ShiftKey,
                    Keys.Shift,
                    Keys.Alt,
                    Keys.LWin,
                    Keys.RWin
                };

        private bool winKeyPressed;

        [DllImport("User32.dll")]
        private static extern int GetForegroundWindow();

        [DllImport("user32.dll")]
        private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

        public KeyProvider(IInterceptKeys interceptKeysSource, IPasswordModeService passwordModeService, IDesktopLockEventService desktopLockEventService)
        {
            processes = new Dictionary<int, Process>();
            this.interceptKeysSource = interceptKeysSource;
            this.passwordModeService = passwordModeService;
            this.desktopLockEventService = desktopLockEventService;
        }

        public IObservable<KeyPress> GetKeyStream()
        {
            // We are using an observable create to tie the lifetimes of the session switch stream and the keystream
            return Observable.Create<KeyPress>(observer =>
            {
                // When desktop is locked we will not get the keyup, because we track the windows key