From e8d23af0f2799337af0b0c69a34aa717bf88766e Mon Sep 17 00:00:00 2001
From: "Admiral H. Curtiss" <pikachu025@gmail.com>
Date: Mon, 31 Jul 2023 00:40:15 +0200
Subject: [PATCH] DolphinQt: Add function to set a QWidget's window decorations
 to dark ones on Windows.

---
 Source/Core/DolphinQt/CMakeLists.txt          |  3 +++
 Source/Core/DolphinQt/DolphinQt.vcxproj       |  2 ++
 .../QtUtils/SetWindowDecorations.cpp          | 25 +++++++++++++++++++
 .../DolphinQt/QtUtils/SetWindowDecorations.h  |  9 +++++++
 Source/VSProps/Base.Dolphin.props             |  2 ++
 5 files changed, 41 insertions(+)
 create mode 100644 Source/Core/DolphinQt/QtUtils/SetWindowDecorations.cpp
 create mode 100644 Source/Core/DolphinQt/QtUtils/SetWindowDecorations.h

diff --git a/Source/Core/DolphinQt/CMakeLists.txt b/Source/Core/DolphinQt/CMakeLists.txt
index 50dbbbf57a..2633b3d264 100644
--- a/Source/Core/DolphinQt/CMakeLists.txt
+++ b/Source/Core/DolphinQt/CMakeLists.txt
@@ -294,6 +294,8 @@ add_executable(dolphin-emu
   QtUtils/ParallelProgressDialog.h
   QtUtils/PartiallyClosableTabWidget.cpp
   QtUtils/PartiallyClosableTabWidget.h
+  QtUtils/SetWindowDecorations.cpp
+  QtUtils/SetWindowDecorations.h
   QtUtils/SignalBlocking.h
   QtUtils/UTF8CodePointCountValidator.cpp
   QtUtils/UTF8CodePointCountValidator.h
@@ -403,6 +405,7 @@ if (WIN32)
   PRIVATE
     gdi32.lib
     shell32.lib
+    dwmapi.lib # Needed to set window decorations for dark theme
   )
 endif()
 
diff --git a/Source/Core/DolphinQt/DolphinQt.vcxproj b/Source/Core/DolphinQt/DolphinQt.vcxproj
index 5eaf14fa9f..9217cc3788 100644
--- a/Source/Core/DolphinQt/DolphinQt.vcxproj
+++ b/Source/Core/DolphinQt/DolphinQt.vcxproj
@@ -188,6 +188,7 @@
     <ClCompile Include="QtUtils\ModalMessageBox.cpp" />
     <ClCompile Include="QtUtils\NonDefaultQPushButton.cpp" />
     <ClCompile Include="QtUtils\PartiallyClosableTabWidget.cpp" />
+    <ClCompile Include="QtUtils\SetWindowDecorations.cpp" />
     <ClCompile Include="QtUtils\UTF8CodePointCountValidator.cpp" />
     <ClCompile Include="QtUtils\WindowActivationEventFilter.cpp" />
     <ClCompile Include="QtUtils\WrapInScrollArea.cpp" />
@@ -379,6 +380,7 @@
     <QtMoc Include="QtUtils\FileOpenEventFilter.h" />
     <QtMoc Include="QtUtils\ParallelProgressDialog.h" />
     <QtMoc Include="QtUtils\PartiallyClosableTabWidget.h" />
+    <ClInclude Include="QtUtils\SetWindowDecorations.h" />
     <QtMoc Include="QtUtils\UTF8CodePointCountValidator.h" />
     <QtMoc Include="QtUtils\WindowActivationEventFilter.h" />
     <QtMoc Include="RenderWidget.h" />
diff --git a/Source/Core/DolphinQt/QtUtils/SetWindowDecorations.cpp b/Source/Core/DolphinQt/QtUtils/SetWindowDecorations.cpp
new file mode 100644
index 0000000000..704e5a8f7f
--- /dev/null
+++ b/Source/Core/DolphinQt/QtUtils/SetWindowDecorations.cpp
@@ -0,0 +1,25 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DolphinQt/QtUtils/SetWindowDecorations.h"
+
+#include <QWidget>
+
+#include "DolphinQt/Settings.h"
+
+#ifdef _WIN32
+#include <dwmapi.h>
+#endif
+
+void SetQWidgetWindowDecorations(QWidget* widget)
+{
+#ifdef _WIN32
+  if (!Settings::Instance().IsSystemDark())
+    return;
+
+  BOOL use_dark_title_bar = TRUE;
+  DwmSetWindowAttribute(HWND(widget->winId()),
+                        20 /* DWMWINDOWATTRIBUTE::DWMWA_USE_IMMERSIVE_DARK_MODE */,
+                        &use_dark_title_bar, DWORD(sizeof(use_dark_title_bar)));
+#endif
+}
diff --git a/Source/Core/DolphinQt/QtUtils/SetWindowDecorations.h b/Source/Core/DolphinQt/QtUtils/SetWindowDecorations.h
new file mode 100644
index 0000000000..aa4b3d8687
--- /dev/null
+++ b/Source/Core/DolphinQt/QtUtils/SetWindowDecorations.h
@@ -0,0 +1,9 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+class QWidget;
+
+// Changes the window decorations (title bar) to dark if the user uses dark mode on Windows.
+void SetQWidgetWindowDecorations(QWidget* widget);
diff --git a/Source/VSProps/Base.Dolphin.props b/Source/VSProps/Base.Dolphin.props
index a575d9290b..96fe8b6d2a 100644
--- a/Source/VSProps/Base.Dolphin.props
+++ b/Source/VSProps/Base.Dolphin.props
@@ -79,6 +79,8 @@
       <AdditionalDependencies>avcodec.lib;avformat.lib;avutil.lib;swresample.lib;swscale.lib;bcrypt.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <!--libcurl needs Crypt32.lib-->
       <AdditionalDependencies>Crypt32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <!--Needed to set window decorations for dark theme-->
+      <AdditionalDependencies>dwmapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <!--See Common/CompatPatches.cpp-->
       <ForceSymbolReferences>enableCompatPatches</ForceSymbolReferences>
     </Link>