Add support for custom access keys

Source/LibationAvalonia/AccessKeyHandlerEx.cs

@@ -0,0 +1,69 @@
+using Avalonia;
+using Avalonia.Input;
+using System.Linq;
+
+namespace LibationAvalonia
+{
+    internal class AccessKeyHandlerEx : AccessKeyHandler
+    {
+        public KeyModifiers KeyModifier { get; }
+        private readonly Key[] ActivatorKeys;
+
+        public AccessKeyHandlerEx(KeyModifiers menuKeyModifier)
+        {
+            KeyModifier = menuKeyModifier;
+            ActivatorKeys = menuKeyModifier switch
+            {
+                KeyModifiers.Alt => new[] { Key.LeftAlt, Key.RightAlt },
+                KeyModifiers.Control => new[] { Key.LeftCtrl, Key.RightCtrl },
+                KeyModifiers.Meta => new[] { Key.LWin, Key.RWin },
+                _ => throw new System.NotSupportedException($"{nameof(KeyModifiers)}.{menuKeyModifier} is not implemented"),
+            };
+        }
+
+        protected override void OnPreviewKeyDown(object sender, KeyEventArgs e)
+        {
+            if (ActivatorKeys.Contains(e.Key))
+            {
+                var newArgs = new KeyEventArgs
+                {
+                    Key = Key.LeftAlt,
+                    Handled = e.Handled,
+                    KeyModifiers = e.KeyModifiers,
+                };
+                base.OnPreviewKeyDown(sender, newArgs);
+                e.Handled = newArgs.Handled;
+            }
+        }
+
+        protected override void OnPreviewKeyUp(object sender, KeyEventArgs e)
+        {
+            if (ActivatorKeys.Contains(e.Key))
+            {
+                var newArgs = new KeyEventArgs()
+                {
+                    Key = Key.LeftAlt,
+                    Handled = e.Handled,
+                    KeyModifiers = e.KeyModifiers,
+                };
+                base.OnPreviewKeyUp(sender, newArgs);
+                e.Handled = newArgs.Handled;
+            }
+        }
+
+        protected override void OnKeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.KeyModifiers.HasAllFlags(KeyModifier))
+            {
+                var newArgs = new KeyEventArgs
+                {
+                    Key = e.Key,
+                    Handled = e.Handled,
+                    KeyModifiers = KeyModifiers.Alt,
+                };
+                base.OnKeyDown(sender, newArgs);
+                e.Handled = newArgs.Handled;
+            }
+        }
+    }
+}

Source/LibationAvalonia/App.axaml.cs

@@ -2,6 +2,7 @@
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Input;
 using Avalonia.Markup.Xaml;
 using Avalonia.Media;
 using Avalonia.Platform;
@@ -44,6 +45,9 @@ namespace LibationAvalonia
 		{
 			if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
 			{
+				var acceleratorKey = Configuration.IsMacOs ? KeyModifiers.Meta : KeyModifiers.Alt;
+				AvaloniaLocator.CurrentMutable.Bind<IAccessKeyHandler>().ToFunc(() => new AccessKeyHandlerEx(acceleratorKey));
+
 				var config = Configuration.Instance;
 
 				if (!config.LibationSettingsAreValid)