support trayicon clicked on osx.

src/Avalonia.Controls/Platform/ITrayIconImpl.cs

@@ -23,6 +23,14 @@ namespace Avalonia.Platform
         /// </summary>
         void SetIsVisible (bool visible);
 
+        /// <summary>
+        /// Gets the MenuExporter to allow native menus to be exported to the TrayIcon.
+        /// </summary>
         INativeMenuExporter? MenuExporter { get; }
+
+        /// <summary>
+        /// Gets or Sets the Action that is called when the TrayIcon is clicked.
+        /// </summary>
+        Action? OnClicked { get; set; }
     }
 }

src/Avalonia.Controls/TrayIcon.cs

@@ -22,6 +22,15 @@ namespace Avalonia.Controls
             _impl = impl;
 
             _impl.SetIsVisible(IsVisible);
+
+            _impl.OnClicked = () => Clicked?.Invoke(this, EventArgs.Empty);
+
+            Clicked += TrayIcon_Clicked;
+        }
+
+        private void TrayIcon_Clicked(object sender, EventArgs e)
+        {
+            
         }
 
         public TrayIcon () : this(PlatformManager.CreateTrayIcon())
@@ -52,28 +61,12 @@ namespace Avalonia.Controls
             }
         }
 
-        private static void Lifetime_Exit(object sender, ControlledApplicationLifetimeExitEventArgs e)
-        {
-            var trayIcons = GetTrayIcons(Application.Current);
-
-            foreach(var icon in trayIcons)
-            {
-                icon.Dispose();
-            }
-        }
-
-        private static void Icons_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
-        {
-            
-        }
-
-        private static void RemoveIcons (IEnumerable<TrayIcon> icons)
-        {
-            foreach(var icon in icons)
-            {
-                icon.Dispose();
-            }
-        }
+        /// <summary>
+        /// Raised when the TrayIcon is clicked.
+        /// Note, this is only supported on Win32.
+        /// Linux and OSX this event is not raised.
+        /// </summary>
+        public event EventHandler? Clicked;
 
         /// <summary>
         /// Defines the <see cref="TrayIcons"/> attached property.
@@ -132,6 +125,29 @@ namespace Avalonia.Controls
 
         public INativeMenuExporter? NativeMenuExporter => _impl.MenuExporter;
 
+        private static void Lifetime_Exit(object sender, ControlledApplicationLifetimeExitEventArgs e)
+        {
+            var trayIcons = GetTrayIcons(Application.Current);
+
+            foreach (var icon in trayIcons)
+            {
+                icon.Dispose();
+            }
+        }
+
+        private static void Icons_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
+        {
+
+        }
+
+        private static void RemoveIcons(IEnumerable<TrayIcon> icons)
+        {
+            foreach (var icon in icons)
+            {
+                icon.Dispose();
+            }
+        }
+
         protected override void OnPropertyChanged<T>(AvaloniaPropertyChangedEventArgs<T> change)
         {
             base.OnPropertyChanged(change);

src/Avalonia.DesignerSupport/Remote/TrayIconStub.cs

@@ -11,7 +11,9 @@ namespace Avalonia.DesignerSupport.Remote
         public Action DoubleClicked { get; set; }
         public Action RightClicked { get; set; }
 
-        public INativeMenuExporter MenuExporter => throw new NotImplementedException();
+        public INativeMenuExporter MenuExporter => null;
+
+        public Action OnClicked { get; set; }
 
         public void Dispose()
         {

src/Avalonia.Native/TrayIconImpl.cs

@@ -4,6 +4,8 @@ using Avalonia.Controls.Platform;
 using Avalonia.Native.Interop;
 using Avalonia.Platform;
 
+#nullable enable
+
 namespace Avalonia.Native
 {
     class TrayIconEvents : CallbackBase, IAvnTrayIconEvents
@@ -34,7 +36,9 @@ namespace Avalonia.Native
 
             MenuExporter = new AvaloniaNativeMenuExporter(_native, factory);
         }
-        
+
+        public Action? OnClicked { get; set; }
+
         public void Dispose()
         {
             

src/Windows/Avalonia.Win32/TrayIconImpl.cs

@@ -23,10 +23,20 @@ namespace Avalonia.Win32
         private IconImpl? _icon;
         private string? _tooltipText;
         private readonly Win32NativeToManagedMenuExporter _exporter;
-
         private static Dictionary<int, TrayIconImpl> s_trayIcons = new Dictionary<int, TrayIconImpl>();
         private bool _disposedValue;
 
+        public TrayIconImpl()
+        {
+            _exporter = new Win32NativeToManagedMenuExporter();
+
+            _uniqueId = ++_nextUniqueId;
+
+            s_trayIcons.Add(_uniqueId, this);
+        }
+
+        public Action? OnClicked { get; set; }
+
         public INativeMenuExporter MenuExporter => _exporter;
 
         internal static void ProcWnd(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam)
@@ -37,15 +47,6 @@ namespace Avalonia.Win32
             }
         }
 
-        public TrayIconImpl()
-        {
-            _exporter = new Win32NativeToManagedMenuExporter();
-
-            _uniqueId = ++_nextUniqueId;
-
-            s_trayIcons.Add(_uniqueId, this);
-        }
-
         public void SetIcon(IWindowIconImpl? icon)
         {
             _icon = icon as IconImpl;
@@ -63,7 +64,6 @@ namespace Avalonia.Win32
             UpdateIcon(!_iconAdded);
         }
 
-
         private void UpdateIcon(bool remove = false)
         {
             var iconData = new NOTIFYICONDATA()
@@ -105,9 +105,7 @@ namespace Avalonia.Win32
                 switch (lParam.ToInt32())
                 {
                     case (int)WindowsMessage.WM_LBUTTONUP:
-                        break;
-
-                    case (int)WindowsMessage.WM_LBUTTONDBLCLK:
+                        OnClicked?.Invoke();
                         break;
 
                     case (int)WindowsMessage.WM_RBUTTONUP:
@@ -264,11 +262,11 @@ namespace Avalonia.Win32
             }
         }
 
-         ~TrayIconImpl()
-         {
-             // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
-             Dispose(disposing: false);
-         }
+        ~TrayIconImpl()
+        {
+            // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
+            Dispose(disposing: false);
+        }
 
         public void Dispose()
         {