Neuerstellung

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>