Don't show overlay windows in Alt+Tab UI or taskbar

Author: zemoto

EnhancePoE/UI/RecipeStatusOverlay.xaml

@@ -16,6 +16,7 @@
         MouseDown="Window_MouseDown"
         Background="Transparent"
         ShowInTaskbar="False"
+        Loaded="OnLoaded"
         Left="{Binding Source={x:Static properties:Settings.Default}, Path=LeftOverlay, Mode=TwoWay}"
         Top="{Binding Source={x:Static properties:Settings.Default}, Path=TopOverlay, Mode=TwoWay}"
         d:DataContext="{d:DesignInstance Type={x:Type local:RecipeStatusOverlayViewModel}">

EnhancePoE/UI/RecipeStatusOverlay.xaml.cs

@@ -4,6 +4,7 @@
 using System.Windows;
 using System.Windows.Input;
 using EnhancePoE.Api;
+using EnhancePoE.Utils;
 
 namespace EnhancePoE.UI;
 
@@ -33,6 +34,8 @@ public RecipeStatusOverlay( ItemSetManager itemSetManager, StashTabGetter stashT
       Properties.Settings.Default.PropertyChanged += OnSettingsChanged;
    }
 
+   private void OnLoaded( object sender, RoutedEventArgs e ) => Win32.MakeToolWindow( this );
+
    private void OnSettingsChanged( object sender, PropertyChangedEventArgs e )
    {
       if ( e.PropertyName == nameof( Properties.Settings.OverlayMode ) )

EnhancePoE/UI/StashTabWindow.xaml

@@ -13,6 +13,8 @@
         Topmost="True"
         MouseLeftButtonDown="OnMouseLeftButtonDown"
         ResizeMode="CanResizeWithGrip"
+        Loaded="OnLoaded"
+        ShowInTaskbar="False"
         Left="{Binding Source={x:Static properties:Settings.Default}, Path=LeftStashTabOverlay, Mode=TwoWay}"
         Top="{Binding Source={x:Static properties:Settings.Default}, Path=TopStashTabOverlay, Mode=TwoWay}"
         Height="{Binding Source={x:Static properties:Settings.Default}, Path=YStashTabOverlay, Mode=TwoWay}"

EnhancePoE/UI/StashTabWindow.xaml.cs

@@ -3,7 +3,6 @@
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
-using System.Windows.Interop;
 using EnhancePoE.Utils;
 
 namespace EnhancePoE.UI;
@@ -25,6 +24,8 @@ public StashTabWindow( ItemSetManager itemSetManager )
       MouseHook.MouseAction += OnMouseHookClick;
    }
 
+   private void OnLoaded( object sender, RoutedEventArgs e ) => Win32.MakeToolWindow( this );
+
    public new virtual void Hide()
    {
       if ( !IsOpen )
@@ -80,14 +81,13 @@ protected override void OnSourceInitialized( EventArgs e )
 
    private void MakeWindowClickThrough( bool clickThrough )
    {
-      var handle = new WindowInteropHelper( this ).Handle;
       if ( clickThrough )
       {
-         Win32.MakeTransparent( handle );
+         Win32.MakeTransparent( this );
       }
       else
       {
-         Win32.MakeNormal( handle );
+         Win32.MakeNormal( this );
       }
    }
 

EnhancePoE/Utils/Win32.cs

@@ -1,11 +1,14 @@
 using System;
 using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Interop;
 
 namespace EnhancePoE.Utils;
 
 internal static class Win32
 {
    public const int WS_EX_TRANSPARENT = 0x00000020;
+   public const int WS_EX_TOOLWINDOW = 0x00000080;
    public const int GWL_EXSTYLE = -20;
 
    [DllImport( "user32.dll" )]
@@ -14,15 +17,25 @@ internal static class Win32
    [DllImport( "user32.dll" )]
    public static extern int SetWindowLong( IntPtr hwnd, int index, int newStyle );
 
-   public static void MakeTransparent( IntPtr hwnd )
+   public static void MakeTransparent( Window window )
    {
+      var hwnd = new WindowInteropHelper( window ).Handle;
       int extendedStyle = GetWindowLong( hwnd, GWL_EXSTYLE );
       _ = SetWindowLong( hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT );
    }
 
-   public static void MakeNormal( IntPtr hwnd )
+   public static void MakeNormal( Window window )
    {
+      var hwnd = new WindowInteropHelper( window ).Handle;
       int extendedStyle = GetWindowLong( hwnd, GWL_EXSTYLE );
       _ = SetWindowLong( hwnd, GWL_EXSTYLE, extendedStyle & ~WS_EX_TRANSPARENT );
    }
+
+   // Ensures window does not show up in Alt+Tab or Win+Tab UI
+   public static void MakeToolWindow( Window window )
+   {
+      var hwnd = new WindowInteropHelper( window ).Handle;
+      int extendedStyle = GetWindowLong( hwnd, GWL_EXSTYLE );
+      _ = SetWindowLong( hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TOOLWINDOW );
+   }
 }