DolphinQt: Add function to set a QWidget's window decorations to dark ones on Windows.

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()
 

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" />

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
+}

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);

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>