From c0b6591babdbd8cb85de627d00ee568e749da35c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=BAben=20Garrido?=
 <57329376+RGarrido03@users.noreply.github.com>
Date: Sat, 3 Jun 2023 23:05:39 +0100
Subject: [PATCH] Fix always-dark shadow, now based on theme

---
 .../Param_ProjectName/Helpers/TitleBarHelper.cs       | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/code/TemplateStudioForWinUICs/Templates/Proj/Default/Param_ProjectName/Helpers/TitleBarHelper.cs b/code/TemplateStudioForWinUICs/Templates/Proj/Default/Param_ProjectName/Helpers/TitleBarHelper.cs
index 31a77f5135..424742af48 100644
--- a/code/TemplateStudioForWinUICs/Templates/Proj/Default/Param_ProjectName/Helpers/TitleBarHelper.cs
+++ b/code/TemplateStudioForWinUICs/Templates/Proj/Default/Param_ProjectName/Helpers/TitleBarHelper.cs
@@ -22,6 +22,9 @@ internal class TitleBarHelper
     [DllImport("user32.dll", CharSet = CharSet.Auto)]
     private static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam);
 
+    [DllImport("dwmapi.dll")]
+    private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
+
     public static void UpdateTitleBar(ElementTheme theme)
     {
         if (App.MainWindow.ExtendsContentIntoTitleBar)
@@ -95,6 +98,14 @@ public static void UpdateTitleBar(ElementTheme theme)
                 SendMessage(hwnd, WMACTIVATE, WAACTIVE, IntPtr.Zero);
                 SendMessage(hwnd, WMACTIVATE, WAINACTIVE, IntPtr.Zero);
             }
+
+            var isDarkModeInt = theme switch
+            {
+                ElementTheme.Dark => 1,
+                ElementTheme.Light => 0,
+                _ => 0
+            };
+            DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE, ref isDarkModeInt, sizeof(int));
         }
     }