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NHotkey/.gitignore

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+# ---> VisualStudio
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+

NHotkey/Directory.Build.props

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+<Project>
+
+  <PropertyGroup>
+    <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)NHotkey.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Package properties">
+    <Authors>Thomas Levesque</Authors>
+    <PackageProjectUrl>https://github.com/thomaslevesque/NHotkey</PackageProjectUrl>
+    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
+    <PackageTags>global;hotkey;windows</PackageTags>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MinVer" Version="2.3.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All"/>
+  </ItemGroup>
+
+</Project>

NHotkey/NHotkey.WindowsForms/ExtensionAttribute.cs

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+// ReSharper disable once CheckNamespace
+namespace System.Runtime.CompilerServices
+{
+    // Enables extension methods in assembly that targets .NET 2.0
+
+    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Method)]
+    internal sealed class ExtensionAttribute : Attribute
+    {
+    }
+}

NHotkey/NHotkey.WindowsForms/Extensions.cs

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+using System.Windows.Forms;
+
+namespace NHotkey.WindowsForms
+{
+    static class Extensions
+    {
+        public static bool HasFlag(this Keys keys, Keys flag)
+        {
+            return (keys & flag) == flag;
+        }
+    }
+}

NHotkey/NHotkey.WindowsForms/HotkeyManager.cs

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+using System;
+using System.Windows.Forms;
+
+namespace NHotkey.WindowsForms
+{
+    [System.Diagnostics.CodeAnalysis.SuppressMessage(
+        "Microsoft.Design",
+        "CA1001:TypesThatOwnDisposableFieldsShouldBeDisposable",
+        Justification = "This is a singleton; disposing it would break it")]
+    public class HotkeyManager : HotkeyManagerBase
+    {
+        #region Singleton implementation
+
+        public static HotkeyManager Current { get { return LazyInitializer.Instance; } }
+
+        private static class LazyInitializer
+        {
+            static LazyInitializer() { }
+            public static readonly HotkeyManager Instance = new HotkeyManager();
+        }
+
+        #endregion
+
+        // ReSharper disable once PrivateFieldCanBeConvertedToLocalVariable
+        private readonly MessageWindow _messageWindow;
+
+        private HotkeyManager()
+        {
+            _messageWindow = new MessageWindow(this);
+            SetHwnd(_messageWindow.Handle);
+        }
+
+        public void AddOrReplace(string name, Keys keys, bool noRepeat, EventHandler<HotkeyEventArgs> handler)
+        {
+            var flags = GetFlags(keys, noRepeat);
+            var vk = unchecked((uint)(keys & ~Keys.Modifiers));
+            AddOrReplace(name, vk, flags, handler);
+        }
+
+        public void AddOrReplace(string name, Keys keys, EventHandler<HotkeyEventArgs> handler)
+        {
+            AddOrReplace(name, keys, false, handler);
+        }
+
+        private static HotkeyFlags GetFlags(Keys hotkey, bool noRepeat)
+        {
+            var noMod = hotkey & ~Keys.Modifiers;
+            var flags = HotkeyFlags.None;
+            if (hotkey.HasFlag(Keys.Alt))
+                flags |= HotkeyFlags.Alt;
+            if (hotkey.HasFlag(Keys.Control))
+                flags |= HotkeyFlags.Control;
+            if (hotkey.HasFlag(Keys.Shift))
+                flags |= HotkeyFlags.Shift;
+            if (noMod == Keys.LWin || noMod == Keys.RWin)
+                flags |= HotkeyFlags.Windows;
+            if (noRepeat)
+                flags |= HotkeyFlags.NoRepeat;
+            return flags;
+        }
+
+        class MessageWindow : ContainerControl
+        {
+            private readonly HotkeyManager _hotkeyManager;
+
+            public MessageWindow(HotkeyManager hotkeyManager)
+            {
+                _hotkeyManager = hotkeyManager;
+            }
+
+            protected override CreateParams CreateParams
+            {
+                get
+                {
+                    var parameters = base.CreateParams;
+                    parameters.Parent = HwndMessage;
+                    return parameters;
+                }
+            }
+
+            protected override void WndProc(ref Message m)
+            {
+                bool handled = false;
+                Hotkey hotkey;
+                m.Result = _hotkeyManager.HandleHotkeyMessage(Handle, m.Msg, m.WParam, m.LParam, ref handled, out hotkey);
+                if (!handled)
+                    base.WndProc(ref m);
+            }
+        }
+    }
+}

NHotkey/NHotkey.WindowsForms/NHotkey.WindowsForms.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+  <PropertyGroup>
+    <TargetFrameworks>net40;net45;netcoreapp3.0</TargetFrameworks>
+    <UseWindowsForms>true</UseWindowsForms>
+  </PropertyGroup>
+  <PropertyGroup Label="Package properties">
+    <Description>A managed library to handle global hotkeys in Windows Forms applications. This package contains the concrete HotkeyManager implementation for Windows Forms.</Description>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\NHotkey\NHotkey.csproj" />
+  </ItemGroup>
+</Project>

NHotkey/NHotkey.Wpf/Extensions.cs

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+using System.Windows.Input;
+
+namespace NHotkey.Wpf
+{
+    static class Extensions
+    {
+        public static bool HasFlag(this ModifierKeys modifiers, ModifierKeys flag)
+        {
+            return (modifiers & flag) == flag;
+        }
+
+        public static bool HasFlag(this HotkeyFlags flags, HotkeyFlags flag)
+        {
+            return (flags & flag) == flag;
+        }
+    }
+}

NHotkey/NHotkey.Wpf/HotkeyAlreadyRegisteredEventArgs.cs

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+using System;
+
+namespace NHotkey.Wpf
+{
+    public class HotkeyAlreadyRegisteredEventArgs : EventArgs
+    {
+        private readonly string _name;
+
+        public HotkeyAlreadyRegisteredEventArgs(string name)
+        {
+            _name = name;
+        }
+
+        public string Name
+        {
+            get { return _name; }
+        }
+    }
+}

NHotkey/NHotkey.Wpf/HotkeyManager.cs

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+using System;
+using System.ComponentModel;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Interop;
+
+namespace NHotkey.Wpf
+{
+    [System.Diagnostics.CodeAnalysis.SuppressMessage(
+        "Microsoft.Design",
+        "CA1001:TypesThatOwnDisposableFieldsShouldBeDisposable",
+        Justification = "This is a singleton; disposing it would break it")]
+    public class HotkeyManager : HotkeyManagerBase
+    {
+        #region Singleton implementation
+
+        public static HotkeyManager Current { get { return LazyInitializer.Instance; } }
+
+        private static class LazyInitializer
+        {
+            static LazyInitializer() { }
+            public static readonly HotkeyManager Instance = new HotkeyManager();
+        }
+
+        public void AddOrReplace(string v, object incrementKeys, object onIncrement)
+        {
+            throw new NotImplementedException();
+        }
+
+        #endregion
+
+        #region Attached property for KeyBindings
+
+        [AttachedPropertyBrowsableForType(typeof(KeyBinding))]
+        public static bool GetRegisterGlobalHotkey(KeyBinding binding)
+        {
+            return (bool)binding.GetValue(RegisterGlobalHotkeyProperty);
+        }
+
+        public static void SetRegisterGlobalHotkey(KeyBinding binding, bool value)
+        {
+            binding.SetValue(RegisterGlobalHotkeyProperty, value);
+        }
+
+        public static readonly DependencyProperty RegisterGlobalHotkeyProperty =
+            DependencyProperty.RegisterAttached(
+                "RegisterGlobalHotkey",
+                typeof(bool),
+                typeof(HotkeyManager),
+                new PropertyMetadata(
+                    false,
+                    RegisterGlobalHotkeyPropertyChanged));
+
+        private static void RegisterGlobalHotkeyPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            var keyBinding = d as KeyBinding;
+            if (keyBinding == null)
+                return;
+
+            bool oldValue = (bool) e.OldValue;
+            bool newValue = (bool) e.NewValue;
+
+            if (DesignerProperties.GetIsInDesignMode(d))
+                return;
+
+            if (oldValue && !newValue)
+            {
+                Current.RemoveKeyBinding(keyBinding);
+            }
+            else if (newValue && !oldValue)
+            {
+                Current.AddKeyBinding(keyBinding);
+            }
+        }
+
+        #endregion
+
+        #region HotkeyAlreadyRegistered event
+
+        public static event EventHandler<HotkeyAlreadyRegisteredEventArgs> HotkeyAlreadyRegistered;
+
+        private static void OnHotkeyAlreadyRegistered(string name)
+        {
+            var handler = HotkeyAlreadyRegistered;
+            if (handler != null)
+                handler(null, new HotkeyAlreadyRegisteredEventArgs(name));
+        }
+
+        #endregion
+
+        // ReSharper disable once PrivateFieldCanBeConvertedToLocalVariable
+        private readonly HwndSource _source;
+        private readonly WeakReferenceCollection<KeyBinding> _keyBindings;
+
+        private HotkeyManager()
+        {
+            _keyBindings = new WeakReferenceCollection<KeyBinding>();
+
+            var parameters = new HwndSourceParameters("Hotkey sink")
+                             {
+                                 HwndSourceHook = HandleMessage,
+                                 ParentWindow = HwndMessage
+                             };
+            _source = new HwndSource(parameters);
+            SetHwnd(_source.Handle);
+        }
+
+        public void AddOrReplace(string name, KeyGesture gesture, EventHandler<HotkeyEventArgs> handler)
+        {
+            AddOrReplace(name, gesture, false, handler);
+        }
+
+        public void AddOrReplace(string name, KeyGesture gesture, bool noRepeat, EventHandler<HotkeyEventArgs> handler)
+        {
+            AddOrReplace(name, gesture.Key, gesture.Modifiers, noRepeat, handler);
+        }
+
+        public void AddOrReplace(string name, Key key, ModifierKeys modifiers, EventHandler<HotkeyEventArgs> handler)
+        {
+            AddOrReplace(name, key, modifiers, false, handler);
+        }
+
+        public void AddOrReplace(string name, Key key, ModifierKeys modifiers, bool noRepeat, EventHandler<HotkeyEventArgs> handler)
+        {
+            var flags = GetFlags(modifiers, noRepeat);
+            var vk = (uint)KeyInterop.VirtualKeyFromKey(key);
+            AddOrReplace(name, vk, flags, handler);
+        }
+
+        private static HotkeyFlags GetFlags(ModifierKeys modifiers, bool noRepeat)
+        {
+            var flags = HotkeyFlags.None;
+            if (modifiers.HasFlag(ModifierKeys.Shift))
+                flags |= HotkeyFlags.Shift;
+            if (modifiers.HasFlag(ModifierKeys.Control))
+                flags |= HotkeyFlags.Control;
+            if (modifiers.HasFlag(ModifierKeys.Alt))
+                flags |= HotkeyFlags.Alt;
+            if (modifiers.HasFlag(ModifierKeys.Windows))
+                flags |= HotkeyFlags.Windows;
+            if (noRepeat)
+                flags |= HotkeyFlags.NoRepeat;
+            return flags;
+        }
+
+        private static ModifierKeys GetModifiers(HotkeyFlags flags)
+        {
+            var modifiers = ModifierKeys.None;
+            if (flags.HasFlag(HotkeyFlags.Shift))
+                modifiers |= ModifierKeys.Shift;
+            if (flags.HasFlag(HotkeyFlags.Control))
+                modifiers |= ModifierKeys.Control;
+            if (flags.HasFlag(HotkeyFlags.Alt))
+                modifiers |= ModifierKeys.Alt;
+            if (flags.HasFlag(HotkeyFlags.Windows))
+                modifiers |= ModifierKeys.Windows;
+            return modifiers;
+        }
+
+        private void AddKeyBinding(KeyBinding keyBinding)
+        {
+            var gesture = (KeyGesture)keyBinding.Gesture;
+            string name = GetNameForKeyBinding(gesture);
+            try
+            {
+                AddOrReplace(name, gesture.Key, gesture.Modifiers, null);
+                _keyBindings.Add(keyBinding);
+            }
+            catch (HotkeyAlreadyRegisteredException)
+            {
+                OnHotkeyAlreadyRegistered(name);
+            }
+        }
+
+        private void RemoveKeyBinding(KeyBinding keyBinding)
+        {
+            var gesture = (KeyGesture)keyBinding.Gesture;
+            string name = GetNameForKeyBinding(gesture);
+            Remove(name);
+            _keyBindings.Remove(keyBinding);
+        }
+
+        private readonly KeyGestureConverter _gestureConverter = new KeyGestureConverter();
+        private string GetNameForKeyBinding(KeyGesture gesture)
+        {
+            string name = gesture.DisplayString;
+            if (string.IsNullOrEmpty(name))
+                name = _gestureConverter.ConvertToString(gesture);
+            return name;
+        }
+
+        private IntPtr HandleMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled)
+        {
+            Hotkey hotkey;
+            var result = HandleHotkeyMessage(hwnd, msg, wparam, lparam, ref handled, out hotkey);
+            if (handled)
+                return result;
+
+            if (hotkey != null)
+                handled = ExecuteBoundCommand(hotkey);
+
+            return result;
+        }
+
+        private bool ExecuteBoundCommand(Hotkey hotkey)
+        {
+            var key = KeyInterop.KeyFromVirtualKey((int)hotkey.VirtualKey);
+            var modifiers = GetModifiers(hotkey.Flags);
+            bool handled = false;
+            foreach (var binding in _keyBindings)
+            {
+                if (binding.Key == key && binding.Modifiers == modifiers)
+                {
+                    handled |= ExecuteCommand(binding);
+                }
+            }
+            return handled;
+        }
+
+        private static bool ExecuteCommand(InputBinding binding)
+        {
+            var command = binding.Command;
+            var parameter = binding.CommandParameter;
+            var target = binding.CommandTarget;
+
+            if (command == null)
+                return false;
+
+            var routedCommand = command as RoutedCommand;
+            if (routedCommand != null)
+            {
+                if (routedCommand.CanExecute(parameter, target))
+                {
+                    routedCommand.Execute(parameter, target);
+                    return true;
+                }
+            }
+            else
+            {
+                if (command.CanExecute(parameter))
+                {
+                    command.Execute(parameter);
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+}

NHotkey/NHotkey.Wpf/NHotkey.Wpf.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+  <PropertyGroup>
+    <TargetFrameworks>net40;net45;netcoreapp3.0;net6.0-windows</TargetFrameworks>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+  <PropertyGroup Label="Package properties">
+    <Description>A managed library to handle global hotkeys in WPF applications. This package contains the concrete HotkeyManager implementation for WPF.</Description>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\NHotkey\NHotkey.csproj" />
+  </ItemGroup>
+</Project>

NHotkey/NHotkey.Wpf/Properties/AssemblyInfo.cs

@@ -0,0 +1,7 @@
+using System.Windows.Markup;
+
+// Mapping a custom namespace to the standard WPF namespace is usually something to avoid,
+// however in this case we're only importing one type (HotkeyManager), and it's unlikely to
+// collide with another type in a future version of WPF. So in this case, we do it for the
+// sake of simplicity, so that the user doesn't need to map the namespace manually.
+[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "NHotkey.Wpf")]

NHotkey/NHotkey.Wpf/WeakReferenceCollection.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace NHotkey.Wpf
+{
+    class WeakReferenceCollection<T> : IEnumerable<T>
+        where T : class
+    {
+        private readonly List<WeakReference> _references = new List<WeakReference>();
+        
+        public IEnumerator<T> GetEnumerator()
+        {
+            var references = _references.ToList();
+            foreach (var reference in references)
+            {
+                var target = reference.Target;
+                if (target != null)
+                    yield return (T) target;
+            }
+            Trim();
+        }
+
+        public void Add(T item)
+        {
+            _references.Add(new WeakReference(item));
+        }
+
+        public void Remove(T item)
+        {
+            _references.RemoveAll(r => (r.Target ?? item) == item);
+        }
+
+        public void Trim()
+        {
+            _references.RemoveAll(r => !r.IsAlive);
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+    }
+}

NHotkey/NHotkey.sln

@@ -0,0 +1,37 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.32112.339
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NHotkey", "NHotkey\NHotkey.csproj", "{6CAB99C4-6F21-4508-9160-CE4DBF540840}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NHotkey.WindowsForms", "NHotkey.WindowsForms\NHotkey.WindowsForms.csproj", "{F0D5CDB4-B74A-419B-9AD6-2A438A268837}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NHotkey.Wpf", "NHotkey.Wpf\NHotkey.Wpf.csproj", "{FC92233F-6F08-45B7-B3EE-7C557582236B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6CAB99C4-6F21-4508-9160-CE4DBF540840}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6CAB99C4-6F21-4508-9160-CE4DBF540840}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6CAB99C4-6F21-4508-9160-CE4DBF540840}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6CAB99C4-6F21-4508-9160-CE4DBF540840}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F0D5CDB4-B74A-419B-9AD6-2A438A268837}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F0D5CDB4-B74A-419B-9AD6-2A438A268837}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F0D5CDB4-B74A-419B-9AD6-2A438A268837}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F0D5CDB4-B74A-419B-9AD6-2A438A268837}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FC92233F-6F08-45B7-B3EE-7C557582236B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FC92233F-6F08-45B7-B3EE-7C557582236B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FC92233F-6F08-45B7-B3EE-7C557582236B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FC92233F-6F08-45B7-B3EE-7C557582236B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {67220BE9-A1D5-41B9-9D16-177606E9D4D5}
+	EndGlobalSection
+EndGlobal

NHotkey/NHotkey/Hotkey.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace NHotkey
+{
+    internal class Hotkey
+    {
+        private static int _nextId;
+
+        private readonly int _id;
+        private readonly uint _virtualKey;
+        private readonly HotkeyFlags _flags;
+        private readonly EventHandler<HotkeyEventArgs> _handler;
+
+        public Hotkey(uint virtualKey, HotkeyFlags flags, EventHandler<HotkeyEventArgs> handler)
+        {
+            _id = ++_nextId;
+            _virtualKey = virtualKey;
+            _flags = flags;
+            _handler = handler;
+        }
+
+        public int Id
+        {
+            get { return _id; }
+        }
+
+        public uint VirtualKey
+        {
+            get { return _virtualKey; }
+        }
+
+        public HotkeyFlags Flags
+        {
+            get { return _flags; }
+        }
+
+        public EventHandler<HotkeyEventArgs> Handler
+        {
+            get { return _handler; }
+        }
+
+        private IntPtr _hwnd;
+
+        public void Register(IntPtr hwnd, string name)
+        {
+            if (!NativeMethods.RegisterHotKey(hwnd, _id, _flags, _virtualKey))
+            {
+                var hr = Marshal.GetHRForLastWin32Error();
+                var ex = Marshal.GetExceptionForHR(hr);
+                if ((uint) hr == 0x80070581)
+                    throw new HotkeyAlreadyRegisteredException(name, ex);
+                throw ex;
+            }
+            _hwnd = hwnd;
+        }
+
+        public void Unregister()
+        {
+            if (_hwnd != IntPtr.Zero)
+            {
+                if (!NativeMethods.UnregisterHotKey(_hwnd, _id))
+                {
+                    var hr = Marshal.GetHRForLastWin32Error();
+                    throw Marshal.GetExceptionForHR(hr);
+                }
+                _hwnd = IntPtr.Zero;
+            }
+        }
+    }
+}

NHotkey/NHotkey/HotkeyAlreadyRegisteredException.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Runtime.Serialization;
+
+namespace NHotkey
+{
+    [Serializable]
+    public class HotkeyAlreadyRegisteredException : Exception
+    {
+        private readonly string _name;
+
+        public HotkeyAlreadyRegisteredException(string name, Exception inner) : base(inner.Message, inner)
+        {
+            _name = name;
+            HResult = Marshal.GetHRForException(inner);
+        }
+
+        protected HotkeyAlreadyRegisteredException(
+            SerializationInfo info,
+            StreamingContext context) : base(info, context)
+        {
+            _name = (string) info.GetValue("_name", typeof (string));
+        }
+
+        public override void GetObjectData(SerializationInfo info, StreamingContext context)
+        {
+            base.GetObjectData(info, context);
+            info.AddValue("_name", _name);
+        }
+
+        public string Name
+        {
+            get { return _name; }
+        }
+    }
+}

NHotkey/NHotkey/HotkeyEventArgs.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace NHotkey
+{
+    public class HotkeyEventArgs : EventArgs
+    {
+        private readonly string _name;
+
+        internal HotkeyEventArgs(string name)
+        {
+            _name = name;
+        }
+
+        public string Name
+        {
+            get { return _name; }
+        }
+
+        public bool Handled { get; set; }
+    }
+}

NHotkey/NHotkey/HotkeyFlags.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace NHotkey
+{
+    [Flags]
+    internal enum HotkeyFlags : uint
+    {
+        None = 0x0000,
+        Alt = 0x0001,
+        Control = 0x0002,
+        Shift = 0x0004,
+        Windows = 0x0008,
+        NoRepeat = 0x4000
+    }
+}

NHotkey/NHotkey/HotkeyManagerBase.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+
+namespace NHotkey
+{
+    public abstract class HotkeyManagerBase
+    {
+        private readonly Dictionary<int, string> _hotkeyNames = new Dictionary<int, string>();
+        private readonly Dictionary<string, Hotkey> _hotkeys = new Dictionary<string, Hotkey>();
+        private IntPtr _hwnd;
+        internal static readonly IntPtr HwndMessage = (IntPtr)(-3);
+
+        internal HotkeyManagerBase()
+        {
+        }
+
+        internal void AddOrReplace(string name, uint virtualKey, HotkeyFlags flags, EventHandler<HotkeyEventArgs> handler)
+        {
+            var hotkey = new Hotkey(virtualKey, flags, handler);
+            lock (_hotkeys)
+            {
+                Remove(name);
+                _hotkeys.Add(name, hotkey);
+                _hotkeyNames.Add(hotkey.Id, name);
+                if (_hwnd != IntPtr.Zero)
+                    hotkey.Register(_hwnd, name);
+            }
+        }
+
+        public void Remove(string name)
+        {
+            lock (_hotkeys)
+            {
+                Hotkey hotkey;
+                if (_hotkeys.TryGetValue(name, out hotkey))
+                {
+                    _hotkeys.Remove(name);
+                    _hotkeyNames.Remove(hotkey.Id);
+                    if (_hwnd != IntPtr.Zero)
+                        hotkey.Unregister();
+                }
+            }
+        }
+
+        public bool IsEnabled { get; set; } = true;
+
+        internal void SetHwnd(IntPtr hwnd)
+        {
+            _hwnd = hwnd;
+        }
+
+        private const int WmHotkey = 0x0312;
+
+        internal IntPtr HandleHotkeyMessage(
+            IntPtr hwnd,
+            int msg,
+            IntPtr wParam,
+            IntPtr lParam,
+            ref bool handled,
+            out Hotkey hotkey)
+        {
+            hotkey = null;
+            if (IsEnabled && msg == WmHotkey)
+            {
+                int id = wParam.ToInt32();
+                string name;
+                if (_hotkeyNames.TryGetValue(id, out name))
+                {
+                    hotkey = _hotkeys[name];
+                    var handler = hotkey.Handler;
+                    if (handler != null)
+                    {
+                        var e = new HotkeyEventArgs(name);
+                        handler(this, e);
+                        handled = e.Handled;
+                    }
+                }
+            }
+            return IntPtr.Zero;
+        }
+    }
+}

NHotkey/NHotkey/NHotkey.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFrameworks>net40;net45;netcoreapp3.0;net6.0-windows</TargetFrameworks>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Package properties">
+    <Description>A managed library to handle global hotkeys in Windows Forms and WPF applications. NOTE: this package doesn't contain a concrete HotkeyManager implementation; you should add either the NHotkey.Wpf or NHotkey.WindowsForms package to get one.</Description>
+  </PropertyGroup>
+
+</Project>

NHotkey/NHotkey/NativeMethods.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace NHotkey
+{
+    static class NativeMethods
+    {
+        [DllImport("user32.dll", SetLastError = true)]
+        internal static extern bool RegisterHotKey(IntPtr hWnd, int id, HotkeyFlags fsModifiers, uint vk);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        internal static extern bool UnregisterHotKey(IntPtr hWnd, int id);
+    }
+}

NHotkey/NHotkey/Properties/AssemblyInfo.cs

@@ -0,0 +1,4 @@
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("NHotkey.WindowsForms, PublicKey=00240000048000009400000006020000002400005253413100040000010001000d37f28dea0d86462d702c5ff882a20c5701fc1421107b336430c0af082910e58ff42c9030dcfe5739ab99f74b91b11dd4de06bfcd30bc9402beb15f023becb0c6b92ad9496e8e5474f3f5684ed32bf9fb69da84593b8be9bebd86542bd452c5bb77e071bbb2f0024a501ebfa897a62798fe2f2a4e72f250fc9c8277e17db1d5")]
+[assembly: InternalsVisibleTo("NHotkey.Wpf, PublicKey=00240000048000009400000006020000002400005253413100040000010001000d37f28dea0d86462d702c5ff882a20c5701fc1421107b336430c0af082910e58ff42c9030dcfe5739ab99f74b91b11dd4de06bfcd30bc9402beb15f023becb0c6b92ad9496e8e5474f3f5684ed32bf9fb69da84593b8be9bebd86542bd452c5bb77e071bbb2f0024a501ebfa897a62798fe2f2a4e72f250fc9c8277e17db1d5")]

NHotkey/README.md

@@ -0,0 +1,2 @@
+# NHotkey.Wpf
+