Add tray status icons

WirelessTextSyncer.Windows/Tray/TrayIconFactory.cs

@@ -0,0 +1,50 @@
+using System.Drawing.Imaging;
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+namespace WirelessTextSyncer.Windows.Tray;
+
+internal static class TrayIconFactory
+{
+    private const string ConnectedResourceName = "WirelessTextSyncer.TrayConnected.png";
+    private const string WaitResourceName = "WirelessTextSyncer.TrayWait.png";
+
+    public static Icon CreateConnectedIcon()
+    {
+        return CreateIconFromResource(ConnectedResourceName);
+    }
+
+    public static Icon CreateWaitIcon()
+    {
+        return CreateIconFromResource(WaitResourceName);
+    }
+
+    private static Icon CreateIconFromResource(string resourceName)
+    {
+        var assembly = Assembly.GetExecutingAssembly();
+        using var stream = assembly.GetManifestResourceStream(resourceName)
+            ?? throw new InvalidOperationException($"Tray icon resource not found: {resourceName}");
+        using var source = new Bitmap(stream);
+        using var bitmap = new Bitmap(source.Width, source.Height, PixelFormat.Format32bppArgb);
+        using (var graphics = Graphics.FromImage(bitmap))
+        {
+            graphics.Clear(Color.Transparent);
+            graphics.DrawImage(source, 0, 0, source.Width, source.Height);
+        }
+
+        var handle = bitmap.GetHicon();
+        try
+        {
+            using var icon = Icon.FromHandle(handle);
+            return (Icon)icon.Clone();
+        }
+        finally
+        {
+            DestroyIcon(handle);
+        }
+    }
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool DestroyIcon(IntPtr handle);
+}