From d1ec437d5186301b4ca3c3977992fde15bb4a095 Mon Sep 17 00:00:00 2001
From: Konstantin S <havendv@gmail.com>
Date: Thu, 3 Aug 2023 01:54:23 +0400
Subject: [PATCH] feat: Added Window ShowInTaskbar and HideInTaskbar
 extensions.

---
 .../H.NotifyIcon.Apps.Maui.csproj             |  1 +
 .../H.NotifyIcon.Shared/WindowExtensions.cs   | 36 +++++++++++++++++++
 src/libs/H.NotifyIcon/Core/WindowUtilities.cs | 30 ++++++++++++++++
 .../H.NotifyIcon/Interop/User32Methods.cs     |  8 ++---
 4 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/src/apps/H.NotifyIcon.Apps.Maui/H.NotifyIcon.Apps.Maui.csproj b/src/apps/H.NotifyIcon.Apps.Maui/H.NotifyIcon.Apps.Maui.csproj
index f3a61ba..60bfca8 100644
--- a/src/apps/H.NotifyIcon.Apps.Maui/H.NotifyIcon.Apps.Maui.csproj
+++ b/src/apps/H.NotifyIcon.Apps.Maui/H.NotifyIcon.Apps.Maui.csproj
@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
+    <TargetFrameworks>$(TargetFrameworks);net7.0-maccatalyst</TargetFrameworks>
 		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net7.0-windows10.0.19041.0</TargetFrameworks>
 		<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
 		<!-- <TargetFrameworks>$(TargetFrameworks);net7.0-tizen</TargetFrameworks> -->
diff --git a/src/libs/H.NotifyIcon.Shared/WindowExtensions.cs b/src/libs/H.NotifyIcon.Shared/WindowExtensions.cs
index 4992a3e..b685043 100644
--- a/src/libs/H.NotifyIcon.Shared/WindowExtensions.cs
+++ b/src/libs/H.NotifyIcon.Shared/WindowExtensions.cs
@@ -69,4 +69,40 @@ public static void Show(
 #pragma warning restore CA1416 // Validate platform compatibility
         }
     }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <returns></returns>
+    public static void ShowInTaskbar(
+        this Window window)
+    {
+        window = window ?? throw new ArgumentNullException(nameof(window));
+
+#if HAS_WPF
+        window.ShowInTaskbar = true;
+#elif !HAS_UNO && !HAS_MAUI
+        WindowUtilities.ShowWindowInTaskbar(WindowNative.GetWindowHandle(window));
+#elif HAS_MAUI_WINUI
+        WindowUtilities.ShowWindowInTaskbar(WindowNative.GetWindowHandle(window.Handler.PlatformView));
+#endif
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <returns></returns>
+    public static void HideInTaskbar(
+        this Window window)
+    {
+        window = window ?? throw new ArgumentNullException(nameof(window));
+
+#if HAS_WPF
+        window.ShowInTaskbar = false;
+#elif !HAS_UNO && !HAS_MAUI
+        WindowUtilities.HideWindowInTaskbar(WindowNative.GetWindowHandle(window));
+#elif HAS_MAUI_WINUI
+        WindowUtilities.HideWindowInTaskbar(WindowNative.GetWindowHandle(window.Handler.PlatformView));
+#endif
+    }
 }
diff --git a/src/libs/H.NotifyIcon/Core/WindowUtilities.cs b/src/libs/H.NotifyIcon/Core/WindowUtilities.cs
index 29f37e9..7c8114c 100644
--- a/src/libs/H.NotifyIcon/Core/WindowUtilities.cs
+++ b/src/libs/H.NotifyIcon/Core/WindowUtilities.cs
@@ -97,7 +97,37 @@ public static bool ShowWindow(nint hWnd)
     {
         return PInvoke.ShowWindow(new HWND(hWnd), SHOW_WINDOW_CMD.SW_SHOW);
     }
+    
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="hWnd"></param>
+    /// <returns></returns>
+    public static void ShowWindowInTaskbar(nint hWnd)
+    {
+        var window = new HWND(hWnd);
+        var style = (WINDOW_EX_STYLE)User32Methods.GetWindowLong(window, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE);
+        style |= WINDOW_EX_STYLE.WS_EX_APPWINDOW;
+        style &= ~(WINDOW_EX_STYLE.WS_EX_TOOLWINDOW);
+
+        _ = User32Methods.SetWindowLong(window, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE, (nint)style);
+    }
+    
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="hWnd"></param>
+    /// <returns></returns>
+    public static void HideWindowInTaskbar(nint hWnd)
+    {
+        var window = new HWND(hWnd);
+        var style = (WINDOW_EX_STYLE)User32Methods.GetWindowLong(window, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE);
+        style |= WINDOW_EX_STYLE.WS_EX_TOOLWINDOW;
+        style &= ~(WINDOW_EX_STYLE.WS_EX_APPWINDOW);
 
+        _ = User32Methods.SetWindowLong(window, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE, (nint)style);
+    }
+    
     /// <summary>
     /// 
     /// </summary>
diff --git a/src/libs/H.NotifyIcon/Interop/User32Methods.cs b/src/libs/H.NotifyIcon/Interop/User32Methods.cs
index 6450b40..205f754 100644
--- a/src/libs/H.NotifyIcon/Interop/User32Methods.cs
+++ b/src/libs/H.NotifyIcon/Interop/User32Methods.cs
@@ -9,14 +9,14 @@ internal static class User32Methods
     internal static nint SetWindowLong(HWND hWnd, WINDOW_LONG_PTR_INDEX nIndex, nint dwNewLong)
     {
         return Environment.Is64BitProcess
-            ? PInvoke.SetWindowLongPtr(hWnd, nIndex, dwNewLong)
-            : PInvoke.SetWindowLong(hWnd, nIndex, (int)dwNewLong);
+            ? PInvoke.SetWindowLongPtr(hWnd, nIndex, dwNewLong).EnsureNonZero()
+            : PInvoke.SetWindowLong(hWnd, nIndex, (int)dwNewLong).EnsureNonZero();
     }
 
     internal static nint GetWindowLong(HWND hWnd, WINDOW_LONG_PTR_INDEX nIndex)
     {
         return Environment.Is64BitProcess
-            ? PInvoke.GetWindowLongPtr(hWnd, nIndex)
-            : PInvoke.GetWindowLong(hWnd, nIndex);
+            ? PInvoke.GetWindowLongPtr(hWnd, nIndex).EnsureNonZero()
+            : PInvoke.GetWindowLong(hWnd, nIndex).EnsureNonZero();
     }
 }