diff --git a/examples/dialog/main.cpp b/examples/dialog/main.cpp
index f88bcb6..033dfe4 100644
--- a/examples/dialog/main.cpp
+++ b/examples/dialog/main.cpp
@@ -24,7 +24,6 @@
 
 #include <QtWidgets/qapplication.h>
 #include <FramelessHelper/Core/private/framelessconfig_p.h>
-#include <clocale>
 #include "dialog.h"
 #include "../shared/log.h"
 
@@ -32,8 +31,6 @@ FRAMELESSHELPER_USE_NAMESPACE
 
 int main(int argc, char *argv[])
 {
-    std::setlocale(LC_ALL, "en_US.UTF-8");
-
     Log::setup(FRAMELESSHELPER_STRING_LITERAL("dialog"));
 
     // Not necessary, but better call this function, before the construction
diff --git a/examples/mainwindow/main.cpp b/examples/mainwindow/main.cpp
index a1401da..0da082b 100644
--- a/examples/mainwindow/main.cpp
+++ b/examples/mainwindow/main.cpp
@@ -24,7 +24,6 @@
 
 #include <QtWidgets/qapplication.h>
 #include <FramelessHelper/Core/private/framelessconfig_p.h>
-#include <clocale>
 #include "mainwindow.h"
 #include "../shared/log.h"
 
@@ -32,8 +31,6 @@ FRAMELESSHELPER_USE_NAMESPACE
 
 int main(int argc, char *argv[])
 {
-    std::setlocale(LC_ALL, "en_US.UTF-8");
-
     Log::setup(FRAMELESSHELPER_STRING_LITERAL("mainwindow"));
 
     // Not necessary, but better call this function, before the construction
diff --git a/examples/quick/main.cpp b/examples/quick/main.cpp
index 04208a7..3e8b3eb 100644
--- a/examples/quick/main.cpp
+++ b/examples/quick/main.cpp
@@ -32,7 +32,6 @@
 #include <QtQuick/qquickwindow.h>
 #include <FramelessHelper/Quick/framelessquickmodule.h>
 #include <FramelessHelper/Core/private/framelessconfig_p.h>
-#include <clocale>
 #include "quicksettings.h"
 #if QMLTC_ENABLED
 #  include <homepage.h>
@@ -51,8 +50,6 @@ static constexpr const bool IS_MACOS_HOST =
 
 int main(int argc, char *argv[])
 {
-    std::setlocale(LC_ALL, "en_US.UTF-8");
-
     Log::setup(FRAMELESSHELPER_STRING_LITERAL("quick"));
 
     // Not necessary, but better call this function, before the construction
@@ -103,10 +100,12 @@ int main(int argc, char *argv[])
         }());
     }
 
+#if 0
     // Enable some helpful debugging messages.
     if (!qEnvironmentVariableIsSet("QML_IMPORT_TRACE")) {
         qputenv("QML_IMPORT_TRACE", FRAMELESSHELPER_BYTEARRAY_LITERAL("1"));
     }
+#endif
 
     const auto engine = std::make_unique<QQmlApplicationEngine>();
 
diff --git a/examples/widget/main.cpp b/examples/widget/main.cpp
index 168dab7..3d8c199 100644
--- a/examples/widget/main.cpp
+++ b/examples/widget/main.cpp
@@ -24,7 +24,6 @@
 
 #include <QtWidgets/qapplication.h>
 #include <FramelessHelper/Core/private/framelessconfig_p.h>
-#include <clocale>
 #include "widget.h"
 #include "../shared/log.h"
 
@@ -32,8 +31,6 @@ FRAMELESSHELPER_USE_NAMESPACE
 
 int main(int argc, char *argv[])
 {
-    std::setlocale(LC_ALL, "en_US.UTF-8");
-
     Log::setup(FRAMELESSHELPER_STRING_LITERAL("widget"));
 
     // Not necessary, but better call this function, before the construction
diff --git a/include/FramelessHelper/Core/chromepalette.h b/include/FramelessHelper/Core/chromepalette.h
index 7770f91..9c56877 100644
--- a/include/FramelessHelper/Core/chromepalette.h
+++ b/include/FramelessHelper/Core/chromepalette.h
@@ -123,5 +123,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(ChromePalette))
diff --git a/include/FramelessHelper/Core/framelesshelper_qt.h b/include/FramelessHelper/Core/framelesshelper_qt.h
index 66c7adf..bc5a5b3 100644
--- a/include/FramelessHelper/Core/framelesshelper_qt.h
+++ b/include/FramelessHelper/Core/framelesshelper_qt.h
@@ -28,6 +28,8 @@
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
+struct SystemParameters;
+
 class FRAMELESSHELPER_CORE_API FramelessHelperQt : public QObject
 {
     Q_OBJECT
@@ -37,7 +39,7 @@ public:
     explicit FramelessHelperQt(QObject *parent = nullptr);
     ~FramelessHelperQt() override;
 
-    static void addWindow(const Global::SystemParameters &params);
+    static void addWindow(const SystemParameters *params);
     static void removeWindow(const WId windowId);
 
 protected:
@@ -45,5 +47,3 @@ protected:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessHelperQt))
diff --git a/include/FramelessHelper/Core/framelesshelper_win.h b/include/FramelessHelper/Core/framelesshelper_win.h
index b3f946d..8706ee4 100644
--- a/include/FramelessHelper/Core/framelesshelper_win.h
+++ b/include/FramelessHelper/Core/framelesshelper_win.h
@@ -29,6 +29,8 @@
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
+struct SystemParameters;
+
 class FRAMELESSHELPER_CORE_API FramelessHelperWin : public QAbstractNativeEventFilter
 {
     Q_DISABLE_COPY_MOVE(FramelessHelperWin)
@@ -37,12 +39,10 @@ public:
     explicit FramelessHelperWin();
     ~FramelessHelperWin() override;
 
-    static void addWindow(const Global::SystemParameters &params);
+    static void addWindow(const SystemParameters *params);
     static void removeWindow(const WId windowId);
 
     Q_NODISCARD bool nativeEventFilter(const QByteArray &eventType, void *message, QT_NATIVE_EVENT_RESULT_TYPE *result) override;
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessHelperWin))
diff --git a/include/FramelessHelper/Core/framelesshelper_windows.h b/include/FramelessHelper/Core/framelesshelper_windows.h
index 1bc5475..d5db16a 100644
--- a/include/FramelessHelper/Core/framelesshelper_windows.h
+++ b/include/FramelessHelper/Core/framelesshelper_windows.h
@@ -409,7 +409,7 @@ using WINDOWCOMPOSITIONATTRIBDATA = struct WINDOWCOMPOSITIONATTRIBDATA
 {
     WINDOWCOMPOSITIONATTRIB Attrib;
     PVOID pvData;
-    DWORD cbData;
+    SIZE_T cbData;
 };
 using PWINDOWCOMPOSITIONATTRIBDATA = WINDOWCOMPOSITIONATTRIBDATA *;
 
diff --git a/include/FramelessHelper/Core/framelesshelpercore_global.h b/include/FramelessHelper/Core/framelesshelpercore_global.h
index b757a9e..be5d7c4 100644
--- a/include/FramelessHelper/Core/framelesshelpercore_global.h
+++ b/include/FramelessHelper/Core/framelesshelpercore_global.h
@@ -37,7 +37,6 @@
 #include <memory>
 
 QT_BEGIN_NAMESPACE
-class QScreen;
 class QEvent;
 class QEnterEvent;
 QT_END_NAMESPACE
@@ -45,16 +44,16 @@ QT_END_NAMESPACE
 #ifndef FRAMELESSHELPER_CORE_API
 #  ifdef FRAMELESSHELPER_CORE_STATIC
 #    define FRAMELESSHELPER_CORE_API
-#  else // FRAMELESSHELPER_CORE_STATIC
+#  else // !FRAMELESSHELPER_CORE_STATIC
 #    ifdef FRAMELESSHELPER_CORE_LIBRARY
 #      define FRAMELESSHELPER_CORE_API Q_DECL_EXPORT
-#    else // FRAMELESSHELPER_CORE_LIBRARY
+#    else // !FRAMELESSHELPER_CORE_LIBRARY
 #      define FRAMELESSHELPER_CORE_API Q_DECL_IMPORT
 #    endif // FRAMELESSHELPER_CORE_LIBRARY
 #  endif // FRAMELESSHELPER_CORE_STATIC
-#endif
+#endif // FRAMELESSHELPER_CORE_API
 
-#if defined(Q_OS_WIN) && !defined(Q_OS_WINDOWS)
+#if (defined(Q_OS_WIN) && !defined(Q_OS_WINDOWS))
 #  define Q_OS_WINDOWS // Since 5.14
 #endif
 
@@ -78,7 +77,7 @@ QT_END_NAMESPACE
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
 #  define Q_NODISCARD [[nodiscard]]
 #  define Q_MAYBE_UNUSED [[maybe_unused]]
-#  define Q_CONSTEXPR2 constexpr
+#  define Q_CONSTEXPR2 constexpr // There's a Q_CONSTEXPR from Qt, which behaves differently.
 #else
 #  define Q_NODISCARD
 #  define Q_MAYBE_UNUSED
@@ -93,14 +92,6 @@ QT_END_NAMESPACE
    using QT_ENTER_EVENT_TYPE = QEvent;
 #endif
 
-#ifndef Q_DECLARE_METATYPE2
-#  if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
-#    define Q_DECLARE_METATYPE2 Q_DECLARE_METATYPE
-#  else
-#    define Q_DECLARE_METATYPE2(Type)
-#  endif
-#endif
-
 #ifndef QUtf8String
 #  define QUtf8String(str) QString::fromUtf8(str)
 #endif
@@ -215,7 +206,7 @@ Q_NAMESPACE_EXPORT(FRAMELESSHELPER_CORE_API)
 // We have to use "qRound()" here because "std::round()" is not constexpr, yet.
 [[maybe_unused]] inline constexpr const QSize kDefaultSystemButtonSize = {qRound(qreal(kDefaultTitleBarHeight) * 1.5), kDefaultTitleBarHeight};
 [[maybe_unused]] inline constexpr const QSize kDefaultSystemButtonIconSize = kDefaultWindowIconSize;
-[[maybe_unused]] inline constexpr const QSize kDefaultWindowSize = {160, 160}; // Value taken from QPA.
+[[maybe_unused]] inline constexpr const QSize kDefaultWindowSize = {160, 160}; // Value taken from Windows QPA.
 
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
 #  define kDefaultBlackColor QColorConstants::Black
@@ -466,105 +457,6 @@ struct VersionNumber
     }
 };
 
-using InitializeHookCallback = std::function<void()>;
-using UninitializeHookCallback = std::function<void()>;
-
-using GetWindowFlagsCallback = std::function<Qt::WindowFlags()>;
-using SetWindowFlagsCallback = std::function<void(const Qt::WindowFlags)>;
-using GetWindowSizeCallback = std::function<QSize()>;
-using SetWindowSizeCallback = std::function<void(const QSize &)>;
-using GetWindowPositionCallback = std::function<QPoint()>;
-using SetWindowPositionCallback = std::function<void(const QPoint &)>;
-using GetWindowScreenCallback = std::function<QScreen *()>;
-using IsWindowFixedSizeCallback = std::function<bool()>;
-using SetWindowFixedSizeCallback = std::function<void(const bool)>;
-using GetWindowStateCallback = std::function<Qt::WindowState()>;
-using SetWindowStateCallback = std::function<void(const Qt::WindowState)>;
-using GetWindowHandleCallback = std::function<QWindow *()>;
-using WindowToScreenCallback = std::function<QPoint(const QPoint &)>;
-using ScreenToWindowCallback = std::function<QPoint(const QPoint &)>;
-using IsInsideSystemButtonsCallback = std::function<bool(const QPoint &, SystemButtonType *)>;
-using IsInsideTitleBarDraggableAreaCallback = std::function<bool(const QPoint &)>;
-using GetWindowDevicePixelRatioCallback = std::function<qreal()>;
-using SetSystemButtonStateCallback = std::function<void(const SystemButtonType, const ButtonState)>;
-using GetWindowIdCallback = std::function<WId()>;
-using ShouldIgnoreMouseEventsCallback = std::function<bool(const QPoint &)>;
-using ShowSystemMenuCallback = std::function<void(const QPoint &)>;
-using SetPropertyCallback = std::function<void(const QByteArray &, const QVariant &)>;
-using GetPropertyCallback = std::function<QVariant(const QByteArray &, const QVariant &)>;
-using SetCursorCallback = std::function<void(const QCursor &)>;
-using UnsetCursorCallback = std::function<void()>;
-using GetWidgetHandleCallback = std::function<QObject *()>;
-
-struct SystemParameters
-{
-    GetWindowFlagsCallback getWindowFlags = nullptr;
-    SetWindowFlagsCallback setWindowFlags = nullptr;
-    GetWindowSizeCallback getWindowSize = nullptr;
-    SetWindowSizeCallback setWindowSize = nullptr;
-    GetWindowPositionCallback getWindowPosition = nullptr;
-    SetWindowPositionCallback setWindowPosition = nullptr;
-    GetWindowScreenCallback getWindowScreen = nullptr;
-    IsWindowFixedSizeCallback isWindowFixedSize = nullptr;
-    SetWindowFixedSizeCallback setWindowFixedSize = nullptr;
-    GetWindowStateCallback getWindowState = nullptr;
-    SetWindowStateCallback setWindowState = nullptr;
-    GetWindowHandleCallback getWindowHandle = nullptr;
-    WindowToScreenCallback windowToScreen = nullptr;
-    ScreenToWindowCallback screenToWindow = nullptr;
-    IsInsideSystemButtonsCallback isInsideSystemButtons = nullptr;
-    IsInsideTitleBarDraggableAreaCallback isInsideTitleBarDraggableArea = nullptr;
-    GetWindowDevicePixelRatioCallback getWindowDevicePixelRatio = nullptr;
-    SetSystemButtonStateCallback setSystemButtonState = nullptr;
-    GetWindowIdCallback getWindowId = nullptr;
-    ShouldIgnoreMouseEventsCallback shouldIgnoreMouseEvents = nullptr;
-    ShowSystemMenuCallback showSystemMenu = nullptr;
-    SetPropertyCallback setProperty = nullptr;
-    GetPropertyCallback getProperty = nullptr;
-    SetCursorCallback setCursor = nullptr;
-    UnsetCursorCallback unsetCursor = nullptr;
-    GetWidgetHandleCallback getWidgetHandle = nullptr;
-
-    [[nodiscard]] inline bool isValid() const
-    {
-        Q_ASSERT(getWindowFlags);
-        Q_ASSERT(setWindowFlags);
-        Q_ASSERT(getWindowSize);
-        Q_ASSERT(setWindowSize);
-        Q_ASSERT(getWindowPosition);
-        Q_ASSERT(setWindowPosition);
-        Q_ASSERT(getWindowScreen);
-        Q_ASSERT(isWindowFixedSize);
-        Q_ASSERT(setWindowFixedSize);
-        Q_ASSERT(getWindowState);
-        Q_ASSERT(setWindowState);
-        Q_ASSERT(getWindowHandle);
-        Q_ASSERT(windowToScreen);
-        Q_ASSERT(screenToWindow);
-        Q_ASSERT(isInsideSystemButtons);
-        Q_ASSERT(isInsideTitleBarDraggableArea);
-        Q_ASSERT(getWindowDevicePixelRatio);
-        Q_ASSERT(setSystemButtonState);
-        Q_ASSERT(getWindowId);
-        Q_ASSERT(shouldIgnoreMouseEvents);
-        Q_ASSERT(showSystemMenu);
-        Q_ASSERT(setProperty);
-        Q_ASSERT(getProperty);
-        Q_ASSERT(setCursor);
-        Q_ASSERT(unsetCursor);
-        Q_ASSERT(getWidgetHandle);
-        return (getWindowFlags && setWindowFlags && getWindowSize
-                && setWindowSize && getWindowPosition && setWindowPosition
-                && getWindowScreen && isWindowFixedSize && setWindowFixedSize
-                && getWindowState && setWindowState && getWindowHandle
-                && windowToScreen && screenToWindow && isInsideSystemButtons
-                && isInsideTitleBarDraggableArea && getWindowDevicePixelRatio
-                && setSystemButtonState && getWindowId && shouldIgnoreMouseEvents
-                && showSystemMenu && setProperty && getProperty && setCursor
-                && unsetCursor && getWidgetHandle);
-    }
-};
-
 struct VersionInfo
 {
     int version = 0;
@@ -622,19 +514,12 @@ namespace FramelessHelper::Core
 FRAMELESSHELPER_CORE_API void initialize();
 FRAMELESSHELPER_CORE_API void uninitialize();
 [[nodiscard]] FRAMELESSHELPER_CORE_API Global::VersionInfo version();
-FRAMELESSHELPER_CORE_API void registerInitializeHook(const Global::InitializeHookCallback &cb);
-FRAMELESSHELPER_CORE_API void registerUninitializeHook(const Global::UninitializeHookCallback &cb);
 FRAMELESSHELPER_CORE_API void setApplicationOSThemeAware();
 FRAMELESSHELPER_CORE_API void outputLogo();
 } // namespace FramelessHelper::Core
 
 FRAMELESSHELPER_END_NAMESPACE
 
-Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(Global)::VersionNumber)
-Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(Global)::SystemParameters)
-Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(Global)::VersionInfo)
-Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(Global)::Dpi);
-
 #ifndef QT_NO_DEBUG_STREAM
 QT_BEGIN_NAMESPACE
 FRAMELESSHELPER_CORE_API QDebug operator<<(QDebug, const FRAMELESSHELPER_PREPEND_NAMESPACE(Global)::VersionNumber &);
diff --git a/include/FramelessHelper/Core/framelessmanager.h b/include/FramelessHelper/Core/framelessmanager.h
index 683ddcb..2954ad4 100644
--- a/include/FramelessHelper/Core/framelessmanager.h
+++ b/include/FramelessHelper/Core/framelessmanager.h
@@ -28,6 +28,7 @@
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
+struct SystemParameters;
 class FramelessManagerPrivate;
 
 class FRAMELESSHELPER_CORE_API FramelessManager : public QObject
@@ -52,7 +53,7 @@ public:
     Q_NODISCARD Global::WallpaperAspectStyle wallpaperAspectStyle() const;
 
 public Q_SLOTS:
-    void addWindow(const Global::SystemParameters &params);
+    void addWindow(const SystemParameters *params);
     void removeWindow(const WId windowId);
 
 Q_SIGNALS:
@@ -64,5 +65,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessManager))
diff --git a/include/FramelessHelper/Core/micamaterial.h b/include/FramelessHelper/Core/micamaterial.h
index d368a56..3795574 100644
--- a/include/FramelessHelper/Core/micamaterial.h
+++ b/include/FramelessHelper/Core/micamaterial.h
@@ -67,5 +67,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(MicaMaterial))
diff --git a/include/FramelessHelper/Core/private/chromepalette_p.h b/include/FramelessHelper/Core/private/chromepalette_p.h
index 1077e47..d18577a 100644
--- a/include/FramelessHelper/Core/private/chromepalette_p.h
+++ b/include/FramelessHelper/Core/private/chromepalette_p.h
@@ -73,5 +73,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(ChromePalettePrivate))
diff --git a/include/FramelessHelper/Core/private/framelessconfig_p.h b/include/FramelessHelper/Core/private/framelessconfig_p.h
index b2fdd44..e097568 100644
--- a/include/FramelessHelper/Core/private/framelessconfig_p.h
+++ b/include/FramelessHelper/Core/private/framelessconfig_p.h
@@ -49,5 +49,3 @@ public:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessConfig))
diff --git a/include/FramelessHelper/Core/private/framelesshelpercore_global_p.h b/include/FramelessHelper/Core/private/framelesshelpercore_global_p.h
new file mode 100644
index 0000000..6ffa120
--- /dev/null
+++ b/include/FramelessHelper/Core/private/framelesshelpercore_global_p.h
@@ -0,0 +1,103 @@
+/*
+ * MIT License
+ *
+ * Copyright (C) 2021-2023 by wangwenx190 (Yuhang Zhao)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+
+#include <FramelessHelper/Core/framelesshelpercore_global.h>
+
+QT_BEGIN_NAMESPACE
+class QScreen;
+QT_END_NAMESPACE
+
+FRAMELESSHELPER_BEGIN_NAMESPACE
+
+using InitializeHookCallback = std::function<void()>;
+using UninitializeHookCallback = std::function<void()>;
+
+using GetWindowFlagsCallback = std::function<Qt::WindowFlags()>;
+using SetWindowFlagsCallback = std::function<void(const Qt::WindowFlags)>;
+using GetWindowSizeCallback = std::function<QSize()>;
+using SetWindowSizeCallback = std::function<void(const QSize &)>;
+using GetWindowPositionCallback = std::function<QPoint()>;
+using SetWindowPositionCallback = std::function<void(const QPoint &)>;
+using GetWindowScreenCallback = std::function<QScreen *()>;
+using IsWindowFixedSizeCallback = std::function<bool()>;
+using SetWindowFixedSizeCallback = std::function<void(const bool)>;
+using GetWindowStateCallback = std::function<Qt::WindowState()>;
+using SetWindowStateCallback = std::function<void(const Qt::WindowState)>;
+using GetWindowHandleCallback = std::function<QWindow *()>;
+using WindowToScreenCallback = std::function<QPoint(const QPoint &)>;
+using ScreenToWindowCallback = std::function<QPoint(const QPoint &)>;
+using IsInsideSystemButtonsCallback = std::function<bool(const QPoint &, Global::SystemButtonType *)>;
+using IsInsideTitleBarDraggableAreaCallback = std::function<bool(const QPoint &)>;
+using GetWindowDevicePixelRatioCallback = std::function<qreal()>;
+using SetSystemButtonStateCallback = std::function<void(const Global::SystemButtonType, const Global::ButtonState)>;
+using GetWindowIdCallback = std::function<WId()>;
+using ShouldIgnoreMouseEventsCallback = std::function<bool(const QPoint &)>;
+using ShowSystemMenuCallback = std::function<void(const QPoint &)>;
+using SetPropertyCallback = std::function<void(const QByteArray &, const QVariant &)>;
+using GetPropertyCallback = std::function<QVariant(const QByteArray &, const QVariant &)>;
+using SetCursorCallback = std::function<void(const QCursor &)>;
+using UnsetCursorCallback = std::function<void()>;
+using GetWidgetHandleCallback = std::function<QObject *()>;
+
+struct SystemParameters
+{
+    GetWindowFlagsCallback getWindowFlags = nullptr;
+    SetWindowFlagsCallback setWindowFlags = nullptr;
+    GetWindowSizeCallback getWindowSize = nullptr;
+    SetWindowSizeCallback setWindowSize = nullptr;
+    GetWindowPositionCallback getWindowPosition = nullptr;
+    SetWindowPositionCallback setWindowPosition = nullptr;
+    GetWindowScreenCallback getWindowScreen = nullptr;
+    IsWindowFixedSizeCallback isWindowFixedSize = nullptr;
+    SetWindowFixedSizeCallback setWindowFixedSize = nullptr;
+    GetWindowStateCallback getWindowState = nullptr;
+    SetWindowStateCallback setWindowState = nullptr;
+    GetWindowHandleCallback getWindowHandle = nullptr;
+    WindowToScreenCallback windowToScreen = nullptr;
+    ScreenToWindowCallback screenToWindow = nullptr;
+    IsInsideSystemButtonsCallback isInsideSystemButtons = nullptr;
+    IsInsideTitleBarDraggableAreaCallback isInsideTitleBarDraggableArea = nullptr;
+    GetWindowDevicePixelRatioCallback getWindowDevicePixelRatio = nullptr;
+    SetSystemButtonStateCallback setSystemButtonState = nullptr;
+    GetWindowIdCallback getWindowId = nullptr;
+    ShouldIgnoreMouseEventsCallback shouldIgnoreMouseEvents = nullptr;
+    ShowSystemMenuCallback showSystemMenu = nullptr;
+    SetPropertyCallback setProperty = nullptr;
+    GetPropertyCallback getProperty = nullptr;
+    SetCursorCallback setCursor = nullptr;
+    UnsetCursorCallback unsetCursor = nullptr;
+    GetWidgetHandleCallback getWidgetHandle = nullptr;
+};
+
+using FramelessParams = SystemParameters *;
+using FramelessParamsConst = const SystemParameters *;
+using FramelessParamsRef = SystemParameters &;
+using FramelessParamsConstRef = const SystemParameters &;
+
+FRAMELESSHELPER_CORE_API void registerInitializeHook(const InitializeHookCallback &cb);
+FRAMELESSHELPER_CORE_API void registerUninitializeHook(const UninitializeHookCallback &cb);
+
+FRAMELESSHELPER_END_NAMESPACE
diff --git a/include/FramelessHelper/Core/private/framelessmanager_p.h b/include/FramelessHelper/Core/private/framelessmanager_p.h
index e54f016..c57daf2 100644
--- a/include/FramelessHelper/Core/private/framelessmanager_p.h
+++ b/include/FramelessHelper/Core/private/framelessmanager_p.h
@@ -24,7 +24,7 @@
 
 #pragma once
 
-#include <FramelessHelper/Core/framelesshelpercore_global.h>
+#include <FramelessHelper/Core/private/framelesshelpercore_global_p.h>
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
@@ -51,7 +51,7 @@ public:
     Q_NODISCARD QString wallpaper() const;
     Q_NODISCARD Global::WallpaperAspectStyle wallpaperAspectStyle() const;
 
-    static void addWindow(const Global::SystemParameters &params);
+    static void addWindow(FramelessParamsConst params);
     static void removeWindow(const WId windowId);
 
     Q_INVOKABLE void notifySystemThemeHasChangedOrNot();
@@ -74,5 +74,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessManagerPrivate))
diff --git a/include/FramelessHelper/Core/private/micamaterial_p.h b/include/FramelessHelper/Core/private/micamaterial_p.h
index 1912582..bf18efb 100644
--- a/include/FramelessHelper/Core/private/micamaterial_p.h
+++ b/include/FramelessHelper/Core/private/micamaterial_p.h
@@ -63,5 +63,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(MicaMaterialPrivate))
diff --git a/include/FramelessHelper/Core/private/registrykey_p.h b/include/FramelessHelper/Core/private/registrykey_p.h
index ef0d8a5..348bdb4 100644
--- a/include/FramelessHelper/Core/private/registrykey_p.h
+++ b/include/FramelessHelper/Core/private/registrykey_p.h
@@ -90,5 +90,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(RegistryKey))
diff --git a/include/FramelessHelper/Core/private/sysapiloader_p.h b/include/FramelessHelper/Core/private/sysapiloader_p.h
index a6343f6..6e6f5c1 100644
--- a/include/FramelessHelper/Core/private/sysapiloader_p.h
+++ b/include/FramelessHelper/Core/private/sysapiloader_p.h
@@ -56,8 +56,6 @@ public:
 
 FRAMELESSHELPER_END_NAMESPACE
 
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(SysApiLoader))
-
 #define API_AVAILABLE(lib, func) \
   (FRAMELESSHELPER_PREPEND_NAMESPACE(SysApiLoader)::instance()->isAvailable(k##lib, k##func))
 
diff --git a/include/FramelessHelper/Core/private/windowborderpainter_p.h b/include/FramelessHelper/Core/private/windowborderpainter_p.h
index f0602ab..128c0c2 100644
--- a/include/FramelessHelper/Core/private/windowborderpainter_p.h
+++ b/include/FramelessHelper/Core/private/windowborderpainter_p.h
@@ -62,5 +62,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(WindowBorderPainterPrivate))
diff --git a/include/FramelessHelper/Core/utils.h b/include/FramelessHelper/Core/utils.h
index 665a071..1f54072 100644
--- a/include/FramelessHelper/Core/utils.h
+++ b/include/FramelessHelper/Core/utils.h
@@ -31,6 +31,8 @@
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
+struct SystemParameters;
+
 namespace Utils
 {
 
@@ -43,10 +45,7 @@ FRAMELESSHELPER_CORE_API void startSystemResize(QWindow *window, const Qt::Edges
 [[nodiscard]] FRAMELESSHELPER_CORE_API QString getSystemButtonGlyph(const Global::SystemButtonType button);
 [[nodiscard]] FRAMELESSHELPER_CORE_API QWindow *findWindow(const WId windowId);
 FRAMELESSHELPER_CORE_API void moveWindowToDesktopCenter(
-    const Global::GetWindowScreenCallback &getWindowScreen,
-    const Global::GetWindowSizeCallback &getWindowSize,
-    const Global::SetWindowPositionCallback &setWindowPosition,
-    const bool considerTaskBar);
+    const SystemParameters *params, const bool considerTaskBar);
 [[nodiscard]] FRAMELESSHELPER_CORE_API Global::SystemTheme getSystemTheme();
 [[nodiscard]] FRAMELESSHELPER_CORE_API Qt::WindowState windowStatesToWindowState(
     const Qt::WindowStates states);
@@ -84,10 +83,8 @@ FRAMELESSHELPER_CORE_API void updateInternalWindowFrameMargins(QWindow *window,
 [[nodiscard]] FRAMELESSHELPER_CORE_API bool isWindowNoState(const WId windowId);
 FRAMELESSHELPER_CORE_API void syncWmPaintWithDwm();
 FRAMELESSHELPER_CORE_API void showSystemMenu(
-    const WId windowId,
-    const QPoint &pos,
-    const bool selectFirstEntry,
-    const Global::IsWindowFixedSizeCallback &isWindowFixedSize);
+    const WId windowId, const QPoint &pos,
+    const bool selectFirstEntry, const SystemParameters *params);
 [[nodiscard]] FRAMELESSHELPER_CORE_API QColor getDwmColorizationColor();
 [[nodiscard]] FRAMELESSHELPER_CORE_API Global::DwmColorizationArea getDwmColorizationArea();
 [[nodiscard]] FRAMELESSHELPER_CORE_API bool isHighContrastModeEnabled();
@@ -109,10 +106,7 @@ FRAMELESSHELPER_CORE_API void maybeFixupQtInternals(const WId windowId);
 [[nodiscard]] FRAMELESSHELPER_CORE_API bool isWindowFrameBorderVisible();
 [[nodiscard]] FRAMELESSHELPER_CORE_API bool isFrameBorderColorized();
 FRAMELESSHELPER_CORE_API void installSystemMenuHook(
-    const WId windowId,
-    const Global::IsWindowFixedSizeCallback &isWindowFixedSize,
-    const Global::IsInsideTitleBarDraggableAreaCallback &isInTitleBarArea,
-    const Global::GetWindowHandleCallback &getWindowHandle);
+    const WId windowId, const SystemParameters *params);
 FRAMELESSHELPER_CORE_API void uninstallSystemMenuHook(const WId windowId);
 FRAMELESSHELPER_CORE_API void setAeroSnappingEnabled(const WId windowId, const bool enable);
 FRAMELESSHELPER_CORE_API void tryToEnableHighestDpiAwarenessLevel();
diff --git a/include/FramelessHelper/Core/windowborderpainter.h b/include/FramelessHelper/Core/windowborderpainter.h
index 252e600..063d955 100644
--- a/include/FramelessHelper/Core/windowborderpainter.h
+++ b/include/FramelessHelper/Core/windowborderpainter.h
@@ -80,5 +80,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(WindowBorderPainter))
diff --git a/include/FramelessHelper/Quick/framelesshelperquick_global.h b/include/FramelessHelper/Quick/framelesshelperquick_global.h
index 38bbc72..3684703 100644
--- a/include/FramelessHelper/Quick/framelesshelperquick_global.h
+++ b/include/FramelessHelper/Quick/framelesshelperquick_global.h
@@ -151,5 +151,3 @@ FRAMELESSHELPER_QUICK_API void uninitialize();
 } // namespace FramelessHelper::Quick
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickGlobal))
diff --git a/include/FramelessHelper/Quick/framelessquickhelper.h b/include/FramelessHelper/Quick/framelessquickhelper.h
index 6316a01..f1fca8f 100644
--- a/include/FramelessHelper/Quick/framelessquickhelper.h
+++ b/include/FramelessHelper/Quick/framelessquickhelper.h
@@ -104,6 +104,4 @@ private:
 
 FRAMELESSHELPER_END_NAMESPACE
 
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickHelper))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickHelper))
 QML_DECLARE_TYPEINFO(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickHelper), QML_HAS_ATTACHED_PROPERTIES)
diff --git a/include/FramelessHelper/Quick/framelessquickutils.h b/include/FramelessHelper/Quick/framelessquickutils.h
index d7d6d3c..ee01e50 100644
--- a/include/FramelessHelper/Quick/framelessquickutils.h
+++ b/include/FramelessHelper/Quick/framelessquickutils.h
@@ -88,6 +88,3 @@ Q_SIGNALS:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickUtils))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickUtils))
diff --git a/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p.h b/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p.h
index d66485c..01f61ea 100644
--- a/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p.h
+++ b/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p.h
@@ -82,7 +82,4 @@ private:
 
 FRAMELESSHELPER_END_NAMESPACE
 
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickApplicationWindow))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickApplicationWindow))
-
 #endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
diff --git a/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p_p.h b/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p_p.h
index eac65ff..91cab09 100644
--- a/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p_p.h
+++ b/include/FramelessHelper/Quick/private/framelessquickapplicationwindow_p_p.h
@@ -70,6 +70,4 @@ private:
 
 FRAMELESSHELPER_END_NAMESPACE
 
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickApplicationWindowPrivate))
-
 #endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
diff --git a/include/FramelessHelper/Quick/private/framelessquickhelper_p.h b/include/FramelessHelper/Quick/private/framelessquickhelper_p.h
index a768143..039acb9 100644
--- a/include/FramelessHelper/Quick/private/framelessquickhelper_p.h
+++ b/include/FramelessHelper/Quick/private/framelessquickhelper_p.h
@@ -104,5 +104,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickHelperPrivate))
diff --git a/include/FramelessHelper/Quick/private/framelessquickwindow_p.h b/include/FramelessHelper/Quick/private/framelessquickwindow_p.h
index 4fb2cea..6b79833 100644
--- a/include/FramelessHelper/Quick/private/framelessquickwindow_p.h
+++ b/include/FramelessHelper/Quick/private/framelessquickwindow_p.h
@@ -82,7 +82,4 @@ private:
 
 FRAMELESSHELPER_END_NAMESPACE
 
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickWindow))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickWindow))
-
 #endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
diff --git a/include/FramelessHelper/Quick/private/framelessquickwindow_p_p.h b/include/FramelessHelper/Quick/private/framelessquickwindow_p_p.h
index 7ec8293..15a2c10 100644
--- a/include/FramelessHelper/Quick/private/framelessquickwindow_p_p.h
+++ b/include/FramelessHelper/Quick/private/framelessquickwindow_p_p.h
@@ -70,6 +70,4 @@ private:
 
 FRAMELESSHELPER_END_NAMESPACE
 
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessQuickWindowPrivate))
-
 #endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
diff --git a/include/FramelessHelper/Quick/private/quickimageitem_p.h b/include/FramelessHelper/Quick/private/quickimageitem_p.h
index 8577aba..ec20cdf 100644
--- a/include/FramelessHelper/Quick/private/quickimageitem_p.h
+++ b/include/FramelessHelper/Quick/private/quickimageitem_p.h
@@ -64,5 +64,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickImageItemPrivate))
diff --git a/include/FramelessHelper/Quick/private/quickmicamaterial_p.h b/include/FramelessHelper/Quick/private/quickmicamaterial_p.h
index 9d7c7a2..3620c86 100644
--- a/include/FramelessHelper/Quick/private/quickmicamaterial_p.h
+++ b/include/FramelessHelper/Quick/private/quickmicamaterial_p.h
@@ -60,5 +60,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickMicaMaterialPrivate))
diff --git a/include/FramelessHelper/Quick/private/quickstandardsystembutton_p.h b/include/FramelessHelper/Quick/private/quickstandardsystembutton_p.h
index 98dae00..4b78b20 100644
--- a/include/FramelessHelper/Quick/private/quickstandardsystembutton_p.h
+++ b/include/FramelessHelper/Quick/private/quickstandardsystembutton_p.h
@@ -108,9 +108,6 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickStandardSystemButton))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickStandardSystemButton))
 #endif // (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 
 #endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
diff --git a/include/FramelessHelper/Quick/private/quickstandardtitlebar_p.h b/include/FramelessHelper/Quick/private/quickstandardtitlebar_p.h
index b480468..d40f996 100644
--- a/include/FramelessHelper/Quick/private/quickstandardtitlebar_p.h
+++ b/include/FramelessHelper/Quick/private/quickstandardtitlebar_p.h
@@ -146,9 +146,6 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickStandardTitleBar))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickStandardTitleBar))
 #endif // (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 
 #endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
diff --git a/include/FramelessHelper/Quick/private/quickwindowborder_p.h b/include/FramelessHelper/Quick/private/quickwindowborder_p.h
index 574cee3..1b1f3f9 100644
--- a/include/FramelessHelper/Quick/private/quickwindowborder_p.h
+++ b/include/FramelessHelper/Quick/private/quickwindowborder_p.h
@@ -61,5 +61,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickWindowBorderPrivate))
diff --git a/include/FramelessHelper/Quick/quickchromepalette.h b/include/FramelessHelper/Quick/quickchromepalette.h
index d404c48..85d2248 100644
--- a/include/FramelessHelper/Quick/quickchromepalette.h
+++ b/include/FramelessHelper/Quick/quickchromepalette.h
@@ -49,6 +49,3 @@ protected:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickChromePalette))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickChromePalette))
diff --git a/include/FramelessHelper/Quick/quickimageitem.h b/include/FramelessHelper/Quick/quickimageitem.h
index 3256d0c..f2f08e1 100644
--- a/include/FramelessHelper/Quick/quickimageitem.h
+++ b/include/FramelessHelper/Quick/quickimageitem.h
@@ -63,6 +63,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickImageItem))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickImageItem))
diff --git a/include/FramelessHelper/Quick/quickmicamaterial.h b/include/FramelessHelper/Quick/quickmicamaterial.h
index 03b9a2e..af9c9f0 100644
--- a/include/FramelessHelper/Quick/quickmicamaterial.h
+++ b/include/FramelessHelper/Quick/quickmicamaterial.h
@@ -55,6 +55,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickMicaMaterial))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickMicaMaterial))
diff --git a/include/FramelessHelper/Quick/quickwindowborder.h b/include/FramelessHelper/Quick/quickwindowborder.h
index 8146cc3..135481e 100644
--- a/include/FramelessHelper/Quick/quickwindowborder.h
+++ b/include/FramelessHelper/Quick/quickwindowborder.h
@@ -89,6 +89,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickWindowBorder))
-QML_DECLARE_TYPE(FRAMELESSHELPER_PREPEND_NAMESPACE(QuickWindowBorder))
diff --git a/include/FramelessHelper/Widgets/framelessdialog.h b/include/FramelessHelper/Widgets/framelessdialog.h
index 893beb2..d08a184 100644
--- a/include/FramelessHelper/Widgets/framelessdialog.h
+++ b/include/FramelessHelper/Widgets/framelessdialog.h
@@ -46,5 +46,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessDialog))
diff --git a/include/FramelessHelper/Widgets/framelessmainwindow.h b/include/FramelessHelper/Widgets/framelessmainwindow.h
index 8e022de..d5cd3fb 100644
--- a/include/FramelessHelper/Widgets/framelessmainwindow.h
+++ b/include/FramelessHelper/Widgets/framelessmainwindow.h
@@ -61,5 +61,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessMainWindow))
diff --git a/include/FramelessHelper/Widgets/framelesswidget.h b/include/FramelessHelper/Widgets/framelesswidget.h
index 4c3caf8..4f1ae73 100644
--- a/include/FramelessHelper/Widgets/framelesswidget.h
+++ b/include/FramelessHelper/Widgets/framelesswidget.h
@@ -61,5 +61,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessWidget))
diff --git a/include/FramelessHelper/Widgets/framelesswidgetshelper.h b/include/FramelessHelper/Widgets/framelesswidgetshelper.h
index ad1c51d..48d23dd 100644
--- a/include/FramelessHelper/Widgets/framelesswidgetshelper.h
+++ b/include/FramelessHelper/Widgets/framelesswidgetshelper.h
@@ -90,5 +90,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessWidgetsHelper))
diff --git a/include/FramelessHelper/Widgets/private/framelessdialog_p.h b/include/FramelessHelper/Widgets/private/framelessdialog_p.h
index f4aa7a2..c36a06d 100644
--- a/include/FramelessHelper/Widgets/private/framelessdialog_p.h
+++ b/include/FramelessHelper/Widgets/private/framelessdialog_p.h
@@ -55,5 +55,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessDialogPrivate))
diff --git a/include/FramelessHelper/Widgets/private/framelessmainwindow_p.h b/include/FramelessHelper/Widgets/private/framelessmainwindow_p.h
index 43a282d..fecf9e3 100644
--- a/include/FramelessHelper/Widgets/private/framelessmainwindow_p.h
+++ b/include/FramelessHelper/Widgets/private/framelessmainwindow_p.h
@@ -62,5 +62,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessMainWindowPrivate))
diff --git a/include/FramelessHelper/Widgets/private/framelesswidget_p.h b/include/FramelessHelper/Widgets/private/framelesswidget_p.h
index f337404..347172b 100644
--- a/include/FramelessHelper/Widgets/private/framelesswidget_p.h
+++ b/include/FramelessHelper/Widgets/private/framelesswidget_p.h
@@ -62,5 +62,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessWidgetPrivate))
diff --git a/include/FramelessHelper/Widgets/private/framelesswidgetshelper_p.h b/include/FramelessHelper/Widgets/private/framelesswidgetshelper_p.h
index 8b7eb97..4421561 100644
--- a/include/FramelessHelper/Widgets/private/framelesswidgetshelper_p.h
+++ b/include/FramelessHelper/Widgets/private/framelesswidgetshelper_p.h
@@ -105,5 +105,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(FramelessWidgetsHelperPrivate))
diff --git a/include/FramelessHelper/Widgets/private/standardsystembutton_p.h b/include/FramelessHelper/Widgets/private/standardsystembutton_p.h
index 38bcfc4..8366a67 100644
--- a/include/FramelessHelper/Widgets/private/standardsystembutton_p.h
+++ b/include/FramelessHelper/Widgets/private/standardsystembutton_p.h
@@ -99,5 +99,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(StandardSystemButtonPrivate))
diff --git a/include/FramelessHelper/Widgets/private/standardtitlebar_p.h b/include/FramelessHelper/Widgets/private/standardtitlebar_p.h
index 8ea9c6d..46e6bc5 100644
--- a/include/FramelessHelper/Widgets/private/standardtitlebar_p.h
+++ b/include/FramelessHelper/Widgets/private/standardtitlebar_p.h
@@ -124,5 +124,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(StandardTitleBarPrivate))
diff --git a/include/FramelessHelper/Widgets/private/widgetssharedhelper_p.h b/include/FramelessHelper/Widgets/private/widgetssharedhelper_p.h
index afe64a8..a539f85 100644
--- a/include/FramelessHelper/Widgets/private/widgetssharedhelper_p.h
+++ b/include/FramelessHelper/Widgets/private/widgetssharedhelper_p.h
@@ -89,5 +89,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(WidgetsSharedHelper))
diff --git a/include/FramelessHelper/Widgets/standardsystembutton.h b/include/FramelessHelper/Widgets/standardsystembutton.h
index c5ed7b7..de13d10 100644
--- a/include/FramelessHelper/Widgets/standardsystembutton.h
+++ b/include/FramelessHelper/Widgets/standardsystembutton.h
@@ -102,5 +102,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(StandardSystemButton))
diff --git a/include/FramelessHelper/Widgets/standardtitlebar.h b/include/FramelessHelper/Widgets/standardtitlebar.h
index bb1b46b..7a40dad 100644
--- a/include/FramelessHelper/Widgets/standardtitlebar.h
+++ b/include/FramelessHelper/Widgets/standardtitlebar.h
@@ -104,5 +104,3 @@ private:
 };
 
 FRAMELESSHELPER_END_NAMESPACE
-
-Q_DECLARE_METATYPE2(FRAMELESSHELPER_PREPEND_NAMESPACE(StandardTitleBar))
diff --git a/qmake/core.pri b/qmake/core.pri
index 3f65b00..7518dbb 100644
--- a/qmake/core.pri
+++ b/qmake/core.pri
@@ -38,7 +38,8 @@ HEADERS += \
     $$CORE_PRIV_INC_DIR/framelessmanager_p.h \
     $$CORE_PRIV_INC_DIR/micamaterial_p.h \
     $$CORE_PRIV_INC_DIR/sysapiloader_p.h \
-    $$CORE_PRIV_INC_DIR/windowborderpainter_p.h
+    $$CORE_PRIV_INC_DIR/windowborderpainter_p.h \
+    $$CORE_PRIV_INC_DIR/framelesshelpercore_global_p.h
 
 SOURCES += \
     $$CORE_SRC_DIR/chromepalette.cpp \
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index ebd7448..0932ca2 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -83,6 +83,7 @@ set(PRIVATE_HEADERS
     ${INCLUDE_PREFIX}/private/chromepalette_p.h
     ${INCLUDE_PREFIX}/private/micamaterial_p.h
     ${INCLUDE_PREFIX}/private/windowborderpainter_p.h
+    ${INCLUDE_PREFIX}/private/framelesshelpercore_global_p.h
 )
 
 set(SOURCES
diff --git a/src/core/framelesshelper_qt.cpp b/src/core/framelesshelper_qt.cpp
index 01cf473..38b07df 100644
--- a/src/core/framelesshelper_qt.cpp
+++ b/src/core/framelesshelper_qt.cpp
@@ -26,6 +26,7 @@
 #include "framelessmanager.h"
 #include "framelessmanager_p.h"
 #include "framelessconfig_p.h"
+#include "framelesshelpercore_global_p.h"
 #include "utils.h"
 #include <QtCore/qmutex.h>
 #include <QtCore/qloggingcategory.h>
@@ -70,21 +71,21 @@ FramelessHelperQt::FramelessHelperQt(QObject *parent) : QObject(parent) {}
 
 FramelessHelperQt::~FramelessHelperQt() = default;
 
-void FramelessHelperQt::addWindow(const SystemParameters &params)
+void FramelessHelperQt::addWindow(FramelessParamsConst params)
 {
-    Q_ASSERT(params.isValid());
-    if (!params.isValid()) {
+    Q_ASSERT(params);
+    if (!params) {
         return;
     }
-    const WId windowId = params.getWindowId();
+    const WId windowId = params->getWindowId();
     g_qtHelper()->mutex.lock();
     if (g_qtHelper()->data.contains(windowId)) {
         g_qtHelper()->mutex.unlock();
         return;
     }
     QtHelperData data = {};
-    data.params = params;
-    QWindow *window = params.getWindowHandle();
+    data.params = *params;
+    QWindow *window = params->getWindowHandle();
     // Give it a parent so that it can be deleted even if we forget to do so.
     data.eventFilter = new FramelessHelperQt(window);
     g_qtHelper()->data.insert(windowId, data);
@@ -102,7 +103,7 @@ void FramelessHelperQt::addWindow(const SystemParameters &params)
     window->setProperty("_q_mac_wantsLayer", 1);
 #endif // (defined(Q_OS_MACOS) && (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)))
     if (shouldApplyFramelessFlag) {
-        params.setWindowFlags(params.getWindowFlags() | Qt::FramelessWindowHint);
+        params->setWindowFlags(params->getWindowFlags() | Qt::FramelessWindowHint);
     } else {
 #ifdef Q_OS_LINUX
         Q_UNUSED(Utils::tryHideSystemTitleBar(windowId, true));
diff --git a/src/core/framelesshelper_win.cpp b/src/core/framelesshelper_win.cpp
index aaba3a9..f0745c1 100644
--- a/src/core/framelesshelper_win.cpp
+++ b/src/core/framelesshelper_win.cpp
@@ -29,6 +29,7 @@
 #include "utils.h"
 #include "winverhelper_p.h"
 #include "framelesshelper_windows.h"
+#include "framelesshelpercore_global_p.h"
 #include <QtCore/qhash.h>
 #include <QtCore/qmutex.h>
 #include <QtCore/qvariant.h>
@@ -452,7 +453,7 @@ Q_GLOBAL_STATIC(Win32Helper, g_win32Helper)
         wcex.lpfnWndProc = FallbackTitleBarWindowProc;
         wcex.hInstance = instance;
         if (RegisterClassExW(&wcex) != INVALID_ATOM) {
-            FramelessHelper::Core::registerUninitializeHook([](){
+            registerUninitializeHook([](){
                 const HINSTANCE instance = GetModuleHandleW(nullptr);
                 if (!instance) {
                     //WARNING << Utils::getSystemErrorMessage(kGetModuleHandleW);
@@ -508,20 +509,20 @@ FramelessHelperWin::FramelessHelperWin() : QAbstractNativeEventFilter() {}
 
 FramelessHelperWin::~FramelessHelperWin() = default;
 
-void FramelessHelperWin::addWindow(const SystemParameters &params)
+void FramelessHelperWin::addWindow(FramelessParamsConst params)
 {
-    Q_ASSERT(params.isValid());
-    if (!params.isValid()) {
+    Q_ASSERT(params);
+    if (!params) {
         return;
     }
-    const WId windowId = params.getWindowId();
+    const WId windowId = params->getWindowId();
     g_win32Helper()->mutex.lock();
     if (g_win32Helper()->data.contains(windowId)) {
         g_win32Helper()->mutex.unlock();
         return;
     }
     Win32HelperData data = {};
-    data.params = params;
+    data.params = *params;
     data.dpi = {Utils::getWindowDpi(windowId, true), Utils::getWindowDpi(windowId, false)};
     g_win32Helper()->data.insert(windowId, data);
     if (!g_win32Helper()->nativeEventFilter) {
@@ -531,7 +532,7 @@ void FramelessHelperWin::addWindow(const SystemParameters &params)
     g_win32Helper()->mutex.unlock();
     DEBUG.noquote() << "The DPI of window" << hwnd2str(windowId) << "is" << data.dpi;
 #if 0
-    params.setWindowFlags(params.getWindowFlags() | Qt::FramelessWindowHint);
+    params->setWindowFlags(params->getWindowFlags() | Qt::FramelessWindowHint);
     // We need some delay here, otherwise the window styles will be overwritten by
     // QPA itself. But don't use QThread::sleep(), it doesn't help in our case.
     QTimer::singleShot(0, qApp, [windowId](){
@@ -542,7 +543,7 @@ void FramelessHelperWin::addWindow(const SystemParameters &params)
     // otherwise we'll get lots of warning messages when we change the window
     // geometry, it will also affect the final window geometry because QPA will
     // always take it into account when setting window size and position.
-    Utils::updateInternalWindowFrameMargins(params.getWindowHandle(), true);
+    Utils::updateInternalWindowFrameMargins(params->getWindowHandle(), true);
 #endif
     // Tell DWM our preferred frame margin.
     Utils::updateWindowFrameMargins(windowId, false);
@@ -557,8 +558,8 @@ void FramelessHelperWin::addWindow(const SystemParameters &params)
         FramelessHelper::Core::setApplicationOSThemeAware();
         if (WindowsVersionHelper::isWin10RS5OrGreater()) {
             const bool dark = Utils::shouldAppsUseDarkMode();
-            const auto isWidget = [&params]() -> bool {
-                const auto widget = params.getWidgetHandle();
+            const auto isWidget = [params]() -> bool {
+                const auto widget = params->getWidgetHandle();
                 return (widget && widget->isWidgetType());
             }();
             if (!isWidget) {
@@ -571,7 +572,7 @@ void FramelessHelperWin::addWindow(const SystemParameters &params)
                 // The fallback title bar window is only used to activate the Snap Layout feature
                 // introduced in Windows 11, so it's not necessary to create it on systems below Win11.
                 if (!FramelessConfig::instance()->isSet(Option::DisableWindowsSnapLayout)) {
-                    if (!createFallbackTitleBarWindow(windowId, params.isWindowFixedSize())) {
+                    if (!createFallbackTitleBarWindow(windowId, params->isWindowFixedSize())) {
                         WARNING << "Failed to create the fallback title bar window.";
                     }
                 }
diff --git a/src/core/framelesshelpercore_global.cpp b/src/core/framelesshelpercore_global.cpp
index 7a1b3c4..bea80da 100644
--- a/src/core/framelesshelpercore_global.cpp
+++ b/src/core/framelesshelpercore_global.cpp
@@ -23,25 +23,8 @@
  */
 
 #include "framelesshelpercore_global.h"
+#include "framelesshelpercore_global_p.h"
 #include "utils.h"
-#include "framelessmanager.h"
-#include "framelesshelper_qt.h"
-#include "chromepalette.h"
-#include "micamaterial.h"
-#include "windowborderpainter.h"
-#include "sysapiloader_p.h"
-#include "framelessmanager_p.h"
-#include "framelessconfig_p.h"
-#include "chromepalette_p.h"
-#include "micamaterial_p.h"
-#include "windowborderpainter_p.h"
-#ifdef Q_OS_WINDOWS
-#  include "framelesshelper_win.h"
-#  include "registrykey_p.h"
-#endif
-#ifdef Q_OS_LINUX
-#  include "framelesshelper_linux.h"
-#endif
 #include <QtCore/qmutex.h>
 #include <QtCore/qiodevice.h>
 #include <QtCore/qcoreapplication.h>
@@ -155,6 +138,26 @@ struct CoreData
 
 Q_GLOBAL_STATIC(CoreData, coreData)
 
+void registerInitializeHook(const InitializeHookCallback &cb)
+{
+    Q_ASSERT(cb);
+    if (!cb) {
+        return;
+    }
+    const QMutexLocker locker(&coreData()->mutex);
+    coreData()->initHooks.append(cb);
+}
+
+void registerUninitializeHook(const UninitializeHookCallback &cb)
+{
+    Q_ASSERT(cb);
+    if (!cb) {
+        return;
+    }
+    const QMutexLocker locker(&coreData()->mutex);
+    coreData()->uninitHooks.append(cb);
+}
+
 namespace FramelessHelper::Core
 {
 
@@ -175,8 +178,8 @@ void initialize()
     // enough, that is, before the construction of any Q(Gui)Application
     // instances. QCoreApplication won't instantiate the platform plugin.
     qputenv(QT_QPA_ENV_VAR, kxcb);
-    XInitThreads();
-    gtk_init(nullptr, nullptr);
+    XInitThreads(); // Users report that GTK is crashing without this.
+    gtk_init(nullptr, nullptr); // Users report that GTK functionalities won't work without this.
 #endif
 
 #if (defined(Q_OS_MACOS) && (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)))
@@ -211,51 +214,6 @@ void initialize()
     QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 #endif
 
-    qRegisterMetaType<Option>();
-    qRegisterMetaType<SystemTheme>();
-    qRegisterMetaType<SystemButtonType>();
-#ifdef Q_OS_WINDOWS
-    qRegisterMetaType<DwmColorizationArea>();
-#endif
-    qRegisterMetaType<ButtonState>();
-#ifdef Q_OS_WINDOWS
-    qRegisterMetaType<WindowsVersion>();
-#endif
-    qRegisterMetaType<BlurMode>();
-    qRegisterMetaType<WallpaperAspectStyle>();
-#  ifdef Q_OS_WINDOWS
-    qRegisterMetaType<RegistryRootKey>();
-#  endif
-    qRegisterMetaType<WindowEdge>();
-    qRegisterMetaType<WindowEdges>();
-#  ifdef Q_OS_WINDOWS
-    qRegisterMetaType<DpiAwareness>();
-#  endif
-    qRegisterMetaType<WindowCornerStyle>();
-    qRegisterMetaType<VersionNumber>();
-    qRegisterMetaType<SystemParameters>();
-    qRegisterMetaType<VersionInfo>();
-    qRegisterMetaType<Dpi>();
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
-    qRegisterMetaType<FramelessManager>();
-#  ifdef Q_OS_WINDOWS
-    qRegisterMetaType<FramelessHelperWin>();
-#  endif
-    qRegisterMetaType<FramelessHelperQt>();
-    qRegisterMetaType<ChromePalette>();
-    qRegisterMetaType<SysApiLoader>();
-    qRegisterMetaType<FramelessManagerPrivate>();
-    qRegisterMetaType<FramelessConfig>();
-    qRegisterMetaType<ChromePalettePrivate>();
-    qRegisterMetaType<MicaMaterial>();
-    qRegisterMetaType<MicaMaterialPrivate>();
-    qRegisterMetaType<WindowBorderPainter>();
-    qRegisterMetaType<WindowBorderPainterPrivate>();
-#  ifdef Q_OS_WINDOWS
-    qRegisterMetaType<RegistryKey>();
-#  endif
-#endif
-
     const QMutexLocker locker(&coreData()->mutex);
     if (!coreData()->initHooks.isEmpty()) {
         for (auto &&hook : std::as_const(coreData()->initHooks)) {
@@ -320,26 +278,6 @@ VersionInfo version()
     return result;
 }
 
-void registerInitializeHook(const InitializeHookCallback &cb)
-{
-    Q_ASSERT(cb);
-    if (!cb) {
-        return;
-    }
-    const QMutexLocker locker(&coreData()->mutex);
-    coreData()->initHooks.append(cb);
-}
-
-void registerUninitializeHook(const UninitializeHookCallback &cb)
-{
-    Q_ASSERT(cb);
-    if (!cb) {
-        return;
-    }
-    const QMutexLocker locker(&coreData()->mutex);
-    coreData()->uninitHooks.append(cb);
-}
-
 void setApplicationOSThemeAware()
 {
     static bool set = false;
diff --git a/src/core/framelesshelpercore_global_p.h b/src/core/framelesshelpercore_global_p.h
new file mode 100644
index 0000000..fc7697f
--- /dev/null
+++ b/src/core/framelesshelpercore_global_p.h
@@ -0,0 +1 @@
+#include "../../include/FramelessHelper/Core/private/framelesshelpercore_global_p.h"
diff --git a/src/core/framelessmanager.cpp b/src/core/framelessmanager.cpp
index cd68f7e..a61b3aa 100644
--- a/src/core/framelessmanager.cpp
+++ b/src/core/framelessmanager.cpp
@@ -26,6 +26,7 @@
 #include "framelessmanager_p.h"
 #include "framelesshelper_qt.h"
 #include "framelessconfig_p.h"
+#include "framelesshelpercore_global_p.h"
 #include "utils.h"
 #ifdef Q_OS_WINDOWS
 #  include "framelesshelper_win.h"
@@ -200,13 +201,13 @@ WallpaperAspectStyle FramelessManagerPrivate::wallpaperAspectStyle() const
     return m_wallpaperAspectStyle;
 }
 
-void FramelessManagerPrivate::addWindow(const SystemParameters &params)
+void FramelessManagerPrivate::addWindow(FramelessParamsConst params)
 {
-    Q_ASSERT(params.isValid());
-    if (!params.isValid()) {
+    Q_ASSERT(params);
+    if (!params) {
         return;
     }
-    const WId windowId = params.getWindowId();
+    const WId windowId = params->getWindowId();
     g_helper()->mutex.lock();
     if (g_helper()->windowIds.contains(windowId)) {
         g_helper()->mutex.unlock();
@@ -222,8 +223,7 @@ void FramelessManagerPrivate::addWindow(const SystemParameters &params)
     if (!pureQt) {
         FramelessHelperWin::addWindow(params);
     }
-    Utils::installSystemMenuHook(windowId, params.isWindowFixedSize,
-        params.isInsideTitleBarDraggableArea, params.getWindowHandle);
+    Utils::installSystemMenuHook(windowId, params);
 #endif
 }
 
@@ -408,7 +408,7 @@ WallpaperAspectStyle FramelessManager::wallpaperAspectStyle() const
     return d->wallpaperAspectStyle();
 }
 
-void FramelessManager::addWindow(const SystemParameters &params)
+void FramelessManager::addWindow(FramelessParamsConst params)
 {
     Q_D(FramelessManager);
     d->addWindow(params);
diff --git a/src/core/utils.cpp b/src/core/utils.cpp
index 61bd15f..6ae3aff 100644
--- a/src/core/utils.cpp
+++ b/src/core/utils.cpp
@@ -23,6 +23,7 @@
  */
 
 #include "utils.h"
+#include "framelesshelpercore_global_p.h"
 #ifdef Q_OS_WINDOWS
 #  include "winverhelper_p.h"
 #endif // Q_OS_WINDOWS
@@ -191,22 +192,17 @@ QWindow *Utils::findWindow(const WId windowId)
     return nullptr;
 }
 
-void Utils::moveWindowToDesktopCenter(const GetWindowScreenCallback &getWindowScreen,
-                                      const GetWindowSizeCallback &getWindowSize,
-                                      const SetWindowPositionCallback &setWindowPosition,
-                                      const bool considerTaskBar)
+void Utils::moveWindowToDesktopCenter(FramelessParamsConst params, const bool considerTaskBar)
 {
-    Q_ASSERT(getWindowScreen);
-    Q_ASSERT(getWindowSize);
-    Q_ASSERT(setWindowPosition);
-    if (!getWindowScreen || !getWindowSize || !setWindowPosition) {
+    Q_ASSERT(params);
+    if (!params) {
         return;
     }
-    const QSize windowSize = getWindowSize();
+    const QSize windowSize = params->getWindowSize();
     if (windowSize.isEmpty() || (windowSize == kDefaultWindowSize)) {
         return;
     }
-    const QScreen *screen = getWindowScreen();
+    const QScreen *screen = params->getWindowScreen();
     if (!screen) {
         screen = QGuiApplication::primaryScreen();
     }
@@ -218,7 +214,7 @@ void Utils::moveWindowToDesktopCenter(const GetWindowScreenCallback &getWindowSc
     const QPoint offset = (considerTaskBar ? screen->availableVirtualGeometry().topLeft() : QPoint(0, 0));
     const int newX = std::round(qreal(screenSize.width() - windowSize.width()) / 2.0);
     const int newY = std::round(qreal(screenSize.height() - windowSize.height()) / 2.0);
-    setWindowPosition(QPoint(newX + offset.x(), newY + offset.y()));
+    params->setWindowPosition(QPoint(newX + offset.x(), newY + offset.y()));
 }
 
 Qt::WindowState Utils::windowStatesToWindowState(const Qt::WindowStates states)
diff --git a/src/core/utils_win.cpp b/src/core/utils_win.cpp
index 080b7f8..fef20ed 100644
--- a/src/core/utils_win.cpp
+++ b/src/core/utils_win.cpp
@@ -29,6 +29,7 @@
 #include "sysapiloader_p.h"
 #include "registrykey_p.h"
 #include "winverhelper_p.h"
+#include "framelesshelpercore_global_p.h"
 #include <QtCore/qmutex.h>
 #include <QtCore/qhash.h>
 #include <QtCore/qloggingcategory.h>
@@ -48,7 +49,9 @@
 #endif // FRAMELESSHELPER_CORE_NO_PRIVATE
 #include <d2d1.h>
 
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 Q_DECLARE_METATYPE(QMargins)
+#endif // (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
@@ -185,9 +188,7 @@ FRAMELESSHELPER_STRING_CONSTANT(SetActiveWindow)
 struct Win32UtilsHelperData
 {
     WNDPROC originalWindowProc = nullptr;
-    IsWindowFixedSizeCallback isWindowFixedSize = nullptr;
-    IsInsideTitleBarDraggableAreaCallback isInTitleBarArea = nullptr;
-    GetWindowHandleCallback getWindowHandle = nullptr;
+    SystemParameters params = {};
 };
 
 struct Win32UtilsHelper
@@ -510,8 +511,8 @@ static inline void moveWindowToMonitor(const HWND hwnd, const MONITORINFOEXW &ac
     switch (uMsg) {
     case WM_RBUTTONUP: {
         const QPoint nativeLocalPos = getNativePosFromMouse();
-        const QPoint qtScenePos = Utils::fromNativePixels(data.getWindowHandle(), nativeLocalPos);
-        if (data.isInTitleBarArea(qtScenePos)) {
+        const QPoint qtScenePos = Utils::fromNativePixels(data.params.getWindowHandle(), nativeLocalPos);
+        if (data.params.isInsideTitleBarDraggableArea(qtScenePos)) {
             POINT pos = {nativeLocalPos.x(), nativeLocalPos.y()};
             if (ClientToScreen(hWnd, &pos) == FALSE) {
                 WARNING << Utils::getSystemErrorMessage(kClientToScreen);
@@ -549,7 +550,7 @@ static inline void moveWindowToMonitor(const HWND hwnd, const MONITORINFOEXW &ac
         break;
     }
     if (shouldShowSystemMenu) {
-        Utils::showSystemMenu(windowId, nativeGlobalPos, broughtByKeyboard, data.isWindowFixedSize);
+        Utils::showSystemMenu(windowId, nativeGlobalPos, broughtByKeyboard, &data.params);
         // QPA's internal code will handle system menu events separately, and its
         // behavior is not what we would want to see because it doesn't know our
         // window doesn't have any window frame now, so return early here to avoid
@@ -761,11 +762,11 @@ DwmColorizationArea Utils::getDwmColorizationArea()
 }
 
 void Utils::showSystemMenu(const WId windowId, const QPoint &pos, const bool selectFirstEntry,
-                           const IsWindowFixedSizeCallback &isWindowFixedSize)
+                           FramelessParamsConst params)
 {
     Q_ASSERT(windowId);
-    Q_ASSERT(isWindowFixedSize);
-    if (!windowId || !isWindowFixedSize) {
+    Q_ASSERT(params);
+    if (!windowId || !params) {
         return;
     }
 
@@ -780,7 +781,7 @@ void Utils::showSystemMenu(const WId windowId, const QPoint &pos, const bool sel
 
     // Tweak the menu items according to the current window status.
     const bool maxOrFull = (IsMaximized(hWnd) || isFullScreen(windowId));
-    const bool fixedSize = isWindowFixedSize();
+    const bool fixedSize = params->isWindowFixedSize();
     EnableMenuItem(hMenu, SC_RESTORE, (MF_BYCOMMAND | ((maxOrFull && !fixedSize) ? MFS_ENABLED : MFS_DISABLED)));
     // The first menu item should be selected by default if the menu is brought
     // up by keyboard. I don't know how to pre-select a menu item but it seems
@@ -1381,14 +1382,11 @@ bool Utils::isFrameBorderColorized()
     return isTitleBarColorized();
 }
 
-void Utils::installSystemMenuHook(const WId windowId,
-                                  const IsWindowFixedSizeCallback &isWindowFixedSize,
-                                  const IsInsideTitleBarDraggableAreaCallback &isInTitleBarArea,
-                                  const GetWindowHandleCallback &getWindowHandle)
+void Utils::installSystemMenuHook(const WId windowId, FramelessParamsConst params)
 {
     Q_ASSERT(windowId);
-    Q_ASSERT(isWindowFixedSize);
-    if (!windowId || !isWindowFixedSize) {
+    Q_ASSERT(params);
+    if (!windowId || !params) {
         return;
     }
     const QMutexLocker locker(&g_utilsHelper()->mutex);
@@ -1411,9 +1409,7 @@ void Utils::installSystemMenuHook(const WId windowId,
     //triggerFrameChange(windowId); // Crash
     Win32UtilsHelperData data = {};
     data.originalWindowProc = originalWindowProc;
-    data.isWindowFixedSize = isWindowFixedSize;
-    data.isInTitleBarArea = isInTitleBarArea;
-    data.getWindowHandle = getWindowHandle;
+    data.params = *params;
     g_utilsHelper()->data.insert(windowId, data);
 }
 
diff --git a/src/quick/framelesshelperquick_global.cpp b/src/quick/framelesshelperquick_global.cpp
index ea11b8b..a516b88 100644
--- a/src/quick/framelesshelperquick_global.cpp
+++ b/src/quick/framelesshelperquick_global.cpp
@@ -23,26 +23,6 @@
  */
 
 #include "framelesshelperquick_global.h"
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
-#  include "framelessquickhelper.h"
-#  include "framelessquickhelper_p.h"
-#  include "framelessquickutils.h"
-#  include "quickchromepalette.h"
-#  include "quickmicamaterial.h"
-#  include "quickmicamaterial_p.h"
-#  include "quickimageitem.h"
-#  include "quickimageitem_p.h"
-#  include "quickwindowborder.h"
-#  include "quickwindowborder_p.h"
-#  ifndef FRAMELESSHELPER_QUICK_NO_PRIVATE
-#    include "quickstandardsystembutton_p.h"
-#    include "quickstandardtitlebar_p.h"
-#    include "framelessquickwindow_p.h"
-#    include "framelessquickwindow_p_p.h"
-#    include "framelessquickapplicationwindow_p.h"
-#    include "framelessquickapplicationwindow_p_p.h"
-#  endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
-#endif // (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 #include <QtCore/qloggingcategory.h>
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
@@ -79,45 +59,6 @@ void initialize()
     inited = true;
 
     FramelessHelper::Core::initialize();
-
-    qRegisterMetaType<QuickGlobal::SystemTheme>();
-    qRegisterMetaType<QuickGlobal::SystemButtonType>();
-    qRegisterMetaType<QuickGlobal::ButtonState>();
-    qRegisterMetaType<QuickGlobal::BlurMode>();
-    qRegisterMetaType<QuickGlobal::WindowEdge>();
-    qRegisterMetaType<QuickGlobal::WindowEdges>();
-
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
-    qRegisterMetaType<QuickGlobal>();
-    qRegisterMetaType<FramelessQuickHelper>();
-    qRegisterMetaType<FramelessQuickHelper *>();
-    qRegisterMetaType<FramelessQuickHelperPrivate>();
-    qRegisterMetaType<FramelessQuickUtils>();
-    qRegisterMetaType<FramelessQuickUtils *>();
-    qRegisterMetaType<QuickChromePalette>();
-    qRegisterMetaType<QuickChromePalette *>();
-    qRegisterMetaType<QuickMicaMaterial>();
-    qRegisterMetaType<QuickMicaMaterial *>();
-    qRegisterMetaType<QuickMicaMaterialPrivate>();
-    qRegisterMetaType<QuickImageItem>();
-    qRegisterMetaType<QuickImageItem *>();
-    qRegisterMetaType<QuickImageItemPrivate>();
-    qRegisterMetaType<QuickWindowBorder>();
-    qRegisterMetaType<QuickWindowBorder *>();
-    qRegisterMetaType<QuickWindowBorderPrivate>();
-#  ifndef FRAMELESSHELPER_QUICK_NO_PRIVATE
-    qRegisterMetaType<QuickStandardSystemButton>();
-    qRegisterMetaType<QuickStandardSystemButton *>();
-    qRegisterMetaType<QuickStandardTitleBar>();
-    qRegisterMetaType<QuickStandardTitleBar *>();
-    qRegisterMetaType<FramelessQuickWindow>();
-    qRegisterMetaType<FramelessQuickWindow *>();
-    qRegisterMetaType<FramelessQuickWindowPrivate>();
-    qRegisterMetaType<FramelessQuickApplicationWindow>();
-    qRegisterMetaType<FramelessQuickApplicationWindow *>();
-    qRegisterMetaType<FramelessQuickApplicationWindowPrivate>();
-#  endif // FRAMELESSHELPER_QUICK_NO_PRIVATE
-#endif // (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
 }
 
 void uninitialize()
diff --git a/src/quick/framelessquickhelper.cpp b/src/quick/framelessquickhelper.cpp
index a5ecdb1..27057d9 100644
--- a/src/quick/framelessquickhelper.cpp
+++ b/src/quick/framelessquickhelper.cpp
@@ -27,8 +27,9 @@
 #include "quickmicamaterial.h"
 #include "quickwindowborder.h"
 #include <FramelessHelper/Core/framelessmanager.h>
-#include <FramelessHelper/Core/private/framelessconfig_p.h>
 #include <FramelessHelper/Core/utils.h>
+#include <FramelessHelper/Core/private/framelessconfig_p.h>
+#include <FramelessHelper/Core/private/framelesshelpercore_global_p.h>
 #ifdef Q_OS_WINDOWS
 #  include <FramelessHelper/Core/private/winverhelper_p.h>
 #endif // Q_OS_WINDOWS
@@ -223,7 +224,7 @@ void FramelessQuickHelperPrivate::attach()
     params.unsetCursor = [window]() -> void { window->unsetCursor(); };
     params.getWidgetHandle = []() -> QObject * { return nullptr; };
 
-    FramelessManager::instance()->addWindow(params);
+    FramelessManager::instance()->addWindow(&params);
 
     g_quickHelper()->mutex.lock();
     data->params = params;
@@ -361,7 +362,8 @@ void FramelessQuickHelperPrivate::showSystemMenu(const QPoint &pos)
     const QPoint globalPos = window->mapToGlobal(pos);
     const QPoint nativePos = Utils::toNativePixels(window, globalPos);
 #ifdef Q_OS_WINDOWS
-    Utils::showSystemMenu(windowId, nativePos, false, [this]() -> bool { return isWindowFixedSize(); });
+    const SystemParameters params = getWindowData().params;
+    Utils::showSystemMenu(windowId, nativePos, false, &params);
 #elif defined(Q_OS_LINUX)
     Utils::openSystemMenu(windowId, nativePos);
 #else
@@ -400,9 +402,8 @@ void FramelessQuickHelperPrivate::moveWindowToDesktopCenter()
     if (!window) {
         return;
     }
-    Utils::moveWindowToDesktopCenter([window]() -> QScreen * { return window->screen(); },
-       [window]() -> QSize { return window->size(); },
-       [window](const QPoint &pos) -> void { window->setX(pos.x()); window->setY(pos.y()); }, true);
+    const SystemParameters params = getWindowData().params;
+    Utils::moveWindowToDesktopCenter(&params, true);
 }
 
 void FramelessQuickHelperPrivate::bringWindowToFront()
@@ -483,7 +484,9 @@ void FramelessQuickHelperPrivate::emitSignalForAllInstances(const QByteArray &si
     if (!window) {
         return;
     }
-    const auto rootObject = (window->contentItem() ? qobject_cast<const QObject *>(window->contentItem()) : qobject_cast<const QObject *>(window));
+    const auto rootObject = (window->contentItem() ?
+            qobject_cast<const QObject *>(window->contentItem())
+            : qobject_cast<const QObject *>(window));
     const auto instances = rootObject->findChildren<FramelessQuickHelper *>();
     if (instances.isEmpty()) {
         return;
diff --git a/src/widgets/framelesshelperwidgets_global.cpp b/src/widgets/framelesshelperwidgets_global.cpp
index 7ae85ce..d209c84 100644
--- a/src/widgets/framelesshelperwidgets_global.cpp
+++ b/src/widgets/framelesshelperwidgets_global.cpp
@@ -23,19 +23,6 @@
  */
 
 #include "framelesshelperwidgets_global.h"
-#include "standardtitlebar.h"
-#include "standardsystembutton.h"
-#include "framelesswidgetshelper.h"
-#include "framelesswidget.h"
-#include "framelessmainwindow.h"
-#include "framelessdialog.h"
-#include "widgetssharedhelper_p.h"
-#include "standardtitlebar_p.h"
-#include "standardsystembutton_p.h"
-#include "framelesswidgetshelper_p.h"
-#include "framelesswidget_p.h"
-#include "framelessmainwindow_p.h"
-#include "framelessdialog_p.h"
 #include <QtCore/qloggingcategory.h>
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
@@ -66,22 +53,6 @@ void initialize()
     inited = true;
 
     FramelessHelper::Core::initialize();
-
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
-    qRegisterMetaType<StandardTitleBar>();
-    qRegisterMetaType<StandardSystemButton>();
-    qRegisterMetaType<FramelessWidgetsHelper>();
-    qRegisterMetaType<FramelessWidget>();
-    qRegisterMetaType<FramelessMainWindow>();
-    qRegisterMetaType<FramelessDialog>();
-    qRegisterMetaType<WidgetsSharedHelper>();
-    qRegisterMetaType<StandardTitleBarPrivate>();
-    qRegisterMetaType<StandardSystemButtonPrivate>();
-    qRegisterMetaType<FramelessWidgetsHelperPrivate>();
-    qRegisterMetaType<FramelessWidgetPrivate>();
-    qRegisterMetaType<FramelessMainWindowPrivate>();
-    qRegisterMetaType<FramelessDialogPrivate>();
-#endif
 }
 
 void uninitialize()
diff --git a/src/widgets/framelesswidgetshelper.cpp b/src/widgets/framelesswidgetshelper.cpp
index d23a506..547aa67 100644
--- a/src/widgets/framelesswidgetshelper.cpp
+++ b/src/widgets/framelesswidgetshelper.cpp
@@ -32,8 +32,9 @@
 #include "framelessdialog_p.h"
 #include "widgetssharedhelper_p.h"
 #include <FramelessHelper/Core/framelessmanager.h>
-#include <FramelessHelper/Core/private/framelessconfig_p.h>
 #include <FramelessHelper/Core/utils.h>
+#include <FramelessHelper/Core/private/framelessconfig_p.h>
+#include <FramelessHelper/Core/private/framelesshelpercore_global_p.h>
 #include <QtCore/qmutex.h>
 #include <QtCore/qhash.h>
 #include <QtCore/qtimer.h>
@@ -462,7 +463,7 @@ void FramelessWidgetsHelperPrivate::attach()
     params.unsetCursor = [window]() -> void { window->unsetCursor(); };
     params.getWidgetHandle = [window]() -> QObject * { return window; };
 
-    FramelessManager::instance()->addWindow(params);
+    FramelessManager::instance()->addWindow(&params);
 
     g_widgetsHelper()->mutex.lock();
     data->params = params;
@@ -762,15 +763,8 @@ void FramelessWidgetsHelperPrivate::moveWindowToDesktopCenter()
     if (!m_window) {
         return;
     }
-    Utils::moveWindowToDesktopCenter([this]() -> QScreen * {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
-        return m_window->screen();
-#else
-        return m_window->windowHandle()->screen();
-#endif
-        },
-        [this]() -> QSize { return m_window->size(); },
-        [this](const QPoint &pos) -> void { m_window->move(pos); }, true);
+    const SystemParameters params = getWindowData().params;
+    Utils::moveWindowToDesktopCenter(&params, true);
 }
 
 void FramelessWidgetsHelperPrivate::bringWindowToFront()
@@ -801,7 +795,8 @@ void FramelessWidgetsHelperPrivate::showSystemMenu(const QPoint &pos)
     const QPoint globalPos = m_window->mapToGlobal(pos);
     const QPoint nativePos = Utils::toNativePixels(m_window->windowHandle(), globalPos);
 #ifdef Q_OS_WINDOWS
-    Utils::showSystemMenu(windowId, nativePos, false, [this]() -> bool { return isWindowFixedSize(); });
+    const SystemParameters params = getWindowData().params;
+    Utils::showSystemMenu(windowId, nativePos, false, &params);
 #elif defined(Q_OS_LINUX)
     Utils::openSystemMenu(windowId, nativePos);
 #else
diff --git a/src/widgets/standardsystembutton.cpp b/src/widgets/standardsystembutton.cpp
index 460e35f..3422634 100644
--- a/src/widgets/standardsystembutton.cpp
+++ b/src/widgets/standardsystembutton.cpp
@@ -24,8 +24,8 @@
 
 #include "standardsystembutton.h"
 #include "standardsystembutton_p.h"
-#include <FramelessHelper/Core/private/framelessmanager_p.h>
 #include <FramelessHelper/Core/utils.h>
+#include <FramelessHelper/Core/private/framelessmanager_p.h>
 #include <QtCore/qloggingcategory.h>
 #include <QtGui/qpainter.h>
 #include <QtGui/qevent.h>
diff --git a/src/widgets/widgetssharedhelper.cpp b/src/widgets/widgetssharedhelper.cpp
index 4682f2d..963faed 100644
--- a/src/widgets/widgetssharedhelper.cpp
+++ b/src/widgets/widgetssharedhelper.cpp
@@ -23,11 +23,11 @@
  */
 
 #include "widgetssharedhelper_p.h"
-#include <FramelessHelper/Core/private/framelessconfig_p.h>
 #include <FramelessHelper/Core/micamaterial.h>
-#include <FramelessHelper/Core/private/micamaterial_p.h>
 #include <FramelessHelper/Core/utils.h>
 #include <FramelessHelper/Core/windowborderpainter.h>
+#include <FramelessHelper/Core/private/framelessconfig_p.h>
+#include <FramelessHelper/Core/private/micamaterial_p.h>
 #ifdef Q_OS_WINDOWS
 #  include <FramelessHelper/Core/private/winverhelper_p.h>
 #endif // Q_OS_WINDOWS