Restore dual mail and calendar app entries

2026-04-11 01:28:19 +02:00
parent 4cb08f0a98
commit fdb340549d
19 changed files with 756 additions and 336 deletions
@@ -0,0 +1,100 @@
+using System;
+using System.Runtime.InteropServices;
+using WinUIEx;
+
+namespace Wino.Mail.WinUI.Helpers;
+
+internal static class WindowAppUserModelIdHelper
+{
+    private static readonly Guid PropertyStoreGuid = new("886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99");
+    private static readonly PropertyKey AppUserModelIdPropertyKey = new(new Guid("9F4C2855-9F79-4B39-A8D0-E1D42DE1D5F3"), 5);
+
+    public static void TrySet(WindowEx window, string appUserModelId)
+    {
+        ArgumentNullException.ThrowIfNull(window);
+
+        if (string.IsNullOrWhiteSpace(appUserModelId))
+            return;
+
+        try
+        {
+            var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(window);
+            if (hwnd == IntPtr.Zero)
+                return;
+
+            var propertyStoreGuid = PropertyStoreGuid;
+            var appUserModelIdPropertyKey = AppUserModelIdPropertyKey;
+            var hr = SHGetPropertyStoreForWindow(hwnd, ref propertyStoreGuid, out var propertyStore);
+            if (hr < 0 || propertyStore == null)
+                return;
+
+            using (propertyStore)
+            {
+                using var value = PropVariant.FromString(appUserModelId);
+                propertyStore.SetValue(ref appUserModelIdPropertyKey, value);
+                propertyStore.Commit();
+            }
+        }
+        catch
+        {
+            // Best effort only. Some Windows builds may keep the original taskbar identity.
+        }
+    }
+
+    [DllImport("shell32.dll")]
+    private static extern int SHGetPropertyStoreForWindow(
+        IntPtr hwnd,
+        ref Guid riid,
+        [MarshalAs(UnmanagedType.Interface)] out IPropertyStore propertyStore);
+
+    [StructLayout(LayoutKind.Sequential, Pack = 4)]
+    private readonly struct PropertyKey(Guid fmtid, uint pid)
+    {
+        public Guid FormatId { get; } = fmtid;
+        public uint PropertyId { get; } = pid;
+    }
+
+    [ComImport]
+    [Guid("886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99")]
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    private interface IPropertyStore : IDisposable
+    {
+        uint GetCount();
+        void GetAt(uint propertyIndex, out PropertyKey key);
+        void GetValue(ref PropertyKey key, out PropVariant pv);
+        void SetValue(ref PropertyKey key, PropVariant pv);
+        void Commit();
+    }
+
+    [StructLayout(LayoutKind.Explicit)]
+    private sealed class PropVariant : IDisposable
+    {
+        [FieldOffset(0)]
+        private ushort _valueType;
+
+        [FieldOffset(8)]
+        private IntPtr _pointerValue;
+
+        private PropVariant(string value)
+        {
+            _valueType = 31;
+            _pointerValue = Marshal.StringToCoTaskMemUni(value);
+        }
+
+        public static PropVariant FromString(string value) => new(value);
+
+        public void Dispose()
+        {
+            PropVariantClear(this);
+            GC.SuppressFinalize(this);
+        }
+
+        ~PropVariant()
+        {
+            Dispose();
+        }
+
+        [DllImport("ole32.dll")]
+        private static extern int PropVariantClear([In, Out] PropVariant propvar);
+    }
+}