win: use qt own functions more

Signed-off-by: Yuhang Zhao <2546789017@qq.com>

README.md

@@ -116,12 +116,12 @@ There are also two classes called `FramelessWidget` and `FramelessMainWindow`, t
 
 #### Code Snippet
 
-First of all, call `void FramelessHelper::Core::initialize()` in your `main` function in a very early stage:
+First of all, call `void FramelessHelper::Widgets::initialize()` in your `main` function in a very early stage:
 
 ```cpp
 int main(int, char **)
 {
-    FramelessHelper::Core::initialize();
+    FramelessHelper::Widgets::initialize();
     // ...
 }
 ```
@@ -167,12 +167,12 @@ void MyWidget::myFunction2()
 
 #### Code Snippet
 
-First of all, you should call `void FramelessHelper::Core::initialize()` in your `main` function in a very early stage:
+First of all, you should call `void FramelessHelper::Quick::initialize()` in your `main` function in a very early stage:
 
 ```cpp
 int main(int, char **)
 {
-    FramelessHelper::Core::initialize();
+    FramelessHelper::Quick::initialize();
     // ...
 }
 ```
@@ -325,7 +325,7 @@ Please refer to the demo projects to see more detailed usages: [examples](./exam
 
 ### `When running on Wayland, dragging the title bar causes crash?`
 
-You need to force Qt to use the **XCB** QPA when running on Wayland. Try setting the environment variable `QT_QPA_PLATFORM` to `xcb` before instantiating any `Q(Gui)Application` instances. Or just call `void FramelessHelper::Core::initialize()` in your `main` function, this function will take care of it for you.
+You need to force Qt to use the **XCB** QPA when running on Wayland. Try setting the environment variable `QT_QPA_PLATFORM` to `xcb` before instantiating any `Q(Gui)Application` instances. Or just call `void FramelessHelper::Widgets/Quick::initialize()` in your `main` function, this function will take care of it for you.
 
 ### `I can see the black background during window resizing?`
 

include/FramelessHelper/Core/utils.h

@@ -120,6 +120,7 @@ FRAMELESSHELPER_CORE_API void forceSquareCornersForWindow(const WId windowId, co
 [[nodiscard]] FRAMELESSHELPER_CORE_API QColor getDwmAccentColor();
 FRAMELESSHELPER_CORE_API void disableOriginalTitleBarFunctionalities
     (const WId windowId, const bool disable = true);
+FRAMELESSHELPER_CORE_API void setQtDarkModeAwareEnabled(const bool enable, const bool pureQuick);
 #endif // Q_OS_WINDOWS
 
 #ifdef Q_OS_LINUX

src/core/framelesshelper_win.cpp

@@ -464,8 +464,8 @@ Q_GLOBAL_STATIC(Win32Helper, g_win32Helper)
         WARNING << Utils::getSystemErrorMessage(kCreateWindowExW);
         return false;
     }
-    // Layered window won't become visible unless you call SetLayeredWindowAttributes()
-    // or UpdateLayeredWindow().
+    // Layered windows won't become visible unless we call the SetLayeredWindowAttributes()
+    // or UpdateLayeredWindow() function at least once.
     if (SetLayeredWindowAttributes(fallbackTitleBarWindowHandle, 0, 255, LWA_ALPHA) == FALSE) {
         WARNING << Utils::getSystemErrorMessage(kSetLayeredWindowAttributes);
         return false;
@@ -519,11 +519,18 @@ void FramelessHelperWin::addWindow(const SystemParameters &params)
     static const bool isWin10RS1OrGreater = Utils::isWindowsVersionOrGreater(WindowsVersion::_10_1607);
     if (isWin10RS1OrGreater) {
         const bool dark = Utils::shouldAppsUseDarkMode();
+        static const bool isQtQuickApplication = (params.getCurrentApplicationType() == ApplicationType::Quick);
         // Tell DWM we may need dark theme non-client area (title bar & frame border).
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+        static bool darkModeAwareSet = false;
+        if (!darkModeAwareSet) {
+            darkModeAwareSet = true;
+            Utils::setQtDarkModeAwareEnabled(true, isQtQuickApplication);
+        }
+#endif
         Utils::updateWindowFrameBorderColor(windowId, dark);
         static const bool isWin10RS5OrGreater = Utils::isWindowsVersionOrGreater(WindowsVersion::_10_1809);
         if (isWin10RS5OrGreater) {
-            static const bool isQtQuickApplication = (params.getCurrentApplicationType() == ApplicationType::Quick);
             if (isQtQuickApplication) {
                 // Tell UXTheme we may need dark theme controls.
                 // Causes some QtWidgets paint incorrectly, so only apply to Qt Quick applications.
@@ -1126,7 +1133,9 @@ bool FramelessHelperWin::nativeEventFilter(const QByteArray &eventType, void *me
                 && (std::wcscmp(reinterpret_cast<LPCWSTR>(lParam), kThemeSettingChangeEventName) == 0)) {
                 systemThemeChanged = true;
                 const bool dark = Utils::shouldAppsUseDarkMode();
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
                 Utils::updateWindowFrameBorderColor(windowId, dark);
+#endif
                 static const bool isWin10RS5OrGreater = Utils::isWindowsVersionOrGreater(WindowsVersion::_10_1809);
                 if (isWin10RS5OrGreater) {
                     static const bool isQtQuickApplication = (data.params.getCurrentApplicationType() == ApplicationType::Quick);

src/core/utils_win.cpp

@@ -1904,4 +1904,42 @@ void Utils::disableOriginalTitleBarFunctionalities(const WId windowId, const boo
     }
 }
 
+void Utils::setQtDarkModeAwareEnabled(const bool enable, const bool pureQuick)
+{
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    using App = QNativeInterface::Private::QWindowsApplication;
+    if (const auto app = qApp->nativeInterface<App>()) {
+        app->setDarkModeHandling([enable, pureQuick]() -> App::DarkModeHandling {
+            if (!enable) {
+                return {};
+            }
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 5, 0))
+            Q_UNUSED(pureQuick);
+            // Enabling the DarkModeWindowFrames flag will save us the call of the
+            // DwmSetWindowAttribute function. Qt will adjust the non-client area
+            // (title bar & frame border) automatically.
+            // Enabling the DarkModeStyle flag will make Qt Widgets apply dark theme
+            // automatically when the system is in dark mode, but before Qt6.5 it's
+            // own dark theme is really broken, so don't use it before 6.5.
+            // There's no global dark theme for Qt Quick applications, so setting this
+            // flag has no effect for pure Qt Quick applications.
+            return {App::DarkModeWindowFrames | App::DarkModeStyle};
+#else
+            if (pureQuick) {
+                // Pure Qt Quick application, it's OK to enable the DarkModeStyle flag.
+                return {App::DarkModeWindowFrames | App::DarkModeStyle};
+            }
+            // Don't try to use the broken dark theme for Qt Widgets applications.
+            return {App::DarkModeWindowFrames};
+#endif
+        }());
+    } else {
+        WARNING << "QWindowsApplication is not available.";
+    }
+#else
+    Q_UNUSED(enable);
+    Q_UNUSED(pureQuick);
+#endif
+}
+
 FRAMELESSHELPER_END_NAMESPACE