Squashed 'NHotkey/' content from commit e16cceb

git-subtree-dir: NHotkey
git-subtree-split: e16cceb7b3e108413d409dbf355a67835822a5e7

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;
+        }
+    }
+}