From 0b33b049b0172cc15666d1837d933bca6d639ef9 Mon Sep 17 00:00:00 2001
From: Daniel Clark <dan@thexamlguy.com>
Date: Mon, 8 Feb 2021 17:33:32 +0000
Subject: [PATCH] Hide window from task switcher

---
 .../NotificationFlyoutPresenter.xaml          | 16 +++++++---
 .../NotificationFlyoutXamlHost.cs             |  2 +-
 .../Extensions/WindowExtensions.cs            | 32 ++++++++++++-------
 NotificationFlyout.Wpf.UI/NativeMethods.txt   |  4 ++-
 4 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/NotificationFlyout.Sample/NotificationFlyoutPresenter.xaml b/NotificationFlyout.Sample/NotificationFlyoutPresenter.xaml
index 599db7a..8a24382 100644
--- a/NotificationFlyout.Sample/NotificationFlyoutPresenter.xaml
+++ b/NotificationFlyout.Sample/NotificationFlyoutPresenter.xaml
@@ -3,14 +3,22 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:controls="using:NotificationFlyout.Uwp.UI.Controls">
-    <Grid
+    <StackPanel
         Width="330"
-        Height="360"
+        Height="500"
         Margin="24">
-        <ComboBox x:Name="test" Margin="0,0,0,8" SelectionChanged="test_SelectionChanged">
+        <ComboBox
+            x:Name="test"
+            Margin="0,0,0,8"
+            SelectionChanged="test_SelectionChanged">
             <ComboBoxItem>System</ComboBoxItem>
             <ComboBoxItem>Dark</ComboBoxItem>
             <ComboBoxItem>Light</ComboBoxItem>
         </ComboBox>
-    </Grid>
+        <Button Margin="0,0,0,8" Content="Button" />
+        <Slider Margin="0,0,0,8" />
+        <TextBox Margin="0,0,0,8" />
+        <ToggleButton Margin="0,0,0,8" />
+        <CalendarView Margin="0,0,0,8" />
+    </StackPanel>
 </controls:NotificationFlyoutPresenter>
diff --git a/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs b/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs
index 205462e..f76d082 100644
--- a/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs
+++ b/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs
@@ -96,7 +96,7 @@ namespace NotificationFlyout.Wpf.UI.Controls
 
             UpdateWindow();
             UpdateIcon();
-
+            this.Hidden();
         }
 
         private void OnTaskbarChanged(object sender, EventArgs args)
diff --git a/NotificationFlyout.Wpf.UI/Extensions/WindowExtensions.cs b/NotificationFlyout.Wpf.UI/Extensions/WindowExtensions.cs
index 3f22693..c1a04a1 100644
--- a/NotificationFlyout.Wpf.UI/Extensions/WindowExtensions.cs
+++ b/NotificationFlyout.Wpf.UI/Extensions/WindowExtensions.cs
@@ -7,6 +7,8 @@ namespace NotificationFlyout.Wpf.UI.Extensions
 {
     public static class WindowExtensions
     {
+        private const int GWL_EX_STYLE = -20;
+
         [Flags]
         private enum WindowFlag : uint
         {
@@ -15,17 +17,9 @@ namespace NotificationFlyout.Wpf.UI.Extensions
             SWP_NOZORDER = 0x0004,
             SWP_NOACTIVATE = 0x0010,
             WS_EX_NOACTIVATE = 0x08000000,
-            SWP_SHOWWINDOW = 0x0040
-        }
-
-        public static void SetWindowPosition(this Window window, double top, double left, double height, double width)
-        {
-            PInvoke.SetWindowPos((HWND)window.GetHandle(), (HWND)IntPtr.Zero, (int)left, (int)top, (int)width, (int)height, (uint)WindowFlag.SWP_NOSIZE | (uint)WindowFlag.SWP_NOZORDER | (uint)WindowFlag.SWP_NOACTIVATE);
-        }
-
-        public static void SetTopAll(this Window window)
-        {
-            PInvoke.SetWindowPos((HWND)window.GetHandle(), (HWND)new IntPtr(-1), 0, 0, 0, 0, (uint)WindowFlag.SWP_NOMOVE | (uint)WindowFlag.SWP_NOSIZE | (uint)WindowFlag.WS_EX_NOACTIVATE);
+            SWP_SHOWWINDOW = 0x0040,
+            WS_EX_APPWINDOW = 0x00040000, 
+            WS_EX_TOOLWINDOW = 0x00000080
         }
 
         public static IntPtr GetHandle(this Window window)
@@ -33,5 +27,21 @@ namespace NotificationFlyout.Wpf.UI.Extensions
             var helper = new WindowInteropHelper(window);
             return helper.Handle;
         }
+
+        public static void Hidden(this Window window)
+        {
+            var handle = window.GetHandle();
+            PInvoke.SetWindowLong((HWND)handle, GWL_EX_STYLE, (PInvoke.GetWindowLong((HWND)handle, GWL_EX_STYLE) | (int)WindowFlag.WS_EX_TOOLWINDOW) & ~(int)WindowFlag.WS_EX_APPWINDOW);
+        }
+
+        public static void SetTopAll(this Window window)
+        {
+            PInvoke.SetWindowPos((HWND)window.GetHandle(), (HWND)new IntPtr(-1), 0, 0, 0, 0, (uint)WindowFlag.SWP_NOMOVE | (uint)WindowFlag.SWP_NOSIZE | (uint)WindowFlag.WS_EX_NOACTIVATE);
+        }
+
+        public static void SetWindowPosition(this Window window, double top, double left, double height, double width)
+        {
+            PInvoke.SetWindowPos((HWND)window.GetHandle(), (HWND)IntPtr.Zero, (int)left, (int)top, (int)width, (int)height, (uint)WindowFlag.SWP_NOSIZE | (uint)WindowFlag.SWP_NOZORDER | (uint)WindowFlag.SWP_NOACTIVATE);
+        }
     }
 }
diff --git a/NotificationFlyout.Wpf.UI/NativeMethods.txt b/NotificationFlyout.Wpf.UI/NativeMethods.txt
index c243fa0..d1279bd 100644
--- a/NotificationFlyout.Wpf.UI/NativeMethods.txt
+++ b/NotificationFlyout.Wpf.UI/NativeMethods.txt
@@ -8,4 +8,6 @@ MonitorFromWindow
 RegisterWindowMessage
 FindWindow
 SHAppBarMessage
-SetWindowPos
\ No newline at end of file
+SetWindowPos
+GetWindowLong
+SetWindowLong
\ No newline at end of file