adw: perform basic code cleanup

57 files changed, 433 insertions, 246 deletions

diff --git a/include/adwaitamm/actionrow.hpp b/include/adwaitamm/actionrow.hpp
index 6a34e15..b6507b7 100644
--- a/include/adwaitamm/actionrow.hpp
+++ b/include/adwaitamm/actionrow.hpp
@@ -1,8 +1,14 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_ACTION_ROW_HPP
 #define LIBADWAITAMM_ACTION_ROW_HPP
 
+#include "adwaitamm/helpers/gobj_mixin.hpp"
 #include "adwaitamm/preferencesrow.hpp"
-#include "helpers/gobj_mixin.hpp"
 
 #include <glibmm/class.h>
 #include <glibmm/object.h>
@@ -16,8 +22,9 @@
 #include <glib-object.h>
 #include <glib.h>
 
-using AdwActionRow = struct _AdwActionRow;
-using AdwActionRowClass = struct _AdwActionRowClass;
+#define _ADWAITA_INSIDE
+#include <adw-action-row.h>
+#undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
diff --git a/include/adwaitamm/alertdialog.hpp b/include/adwaitamm/alertdialog.hpp
index fb0d88f..367512d 100644
--- a/include/adwaitamm/alertdialog.hpp
+++ b/include/adwaitamm/alertdialog.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_ALERT_DIALOG_HPP
 #define LIBADWAITAMM_ALERT_DIALOG_HPP
 
diff --git a/include/adwaitamm/application.hpp b/include/adwaitamm/application.hpp
index 0cbc24f..0da9427 100644
--- a/include/adwaitamm/application.hpp
+++ b/include/adwaitamm/application.hpp
@@ -1,9 +1,14 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_APPLICATION_HPP
 #define LIBADWAITAMM_APPLICATION_HPP
 
 #include "adwaitamm/helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
diff --git a/include/adwaitamm/applicationwindow.hpp b/include/adwaitamm/applicationwindow.hpp
index 454fad5..c2fa0d1 100644
--- a/include/adwaitamm/applicationwindow.hpp
+++ b/include/adwaitamm/applicationwindow.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_APPLICATION_WINDOW_HPP
 #define LIBADWAITAMM_APPLICATION_WINDOW_HPP
 
diff --git a/include/adwaitamm/breakpoint.hpp b/include/adwaitamm/breakpoint.hpp
index 7bcb2d9..4b40574 100644
--- a/include/adwaitamm/breakpoint.hpp
+++ b/include/adwaitamm/breakpoint.hpp
@@ -1,10 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_BREAKPOINT_HPP
 #define LIBADWAITAMM_BREAKPOINT_HPP
 
 #include "adwaitamm/helpers/gobj_mixin.hpp"
 
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
@@ -88,5 +93,4 @@ namespace Glib
   auto wrap(AdwBreakpoint * object, bool copy = false) -> Glib::RefPtr<Adwaita::Breakpoint>;
 }  // namespace Glib
 
-
 #endif
\ No newline at end of file
diff --git a/include/adwaitamm/dialog.hpp b/include/adwaitamm/dialog.hpp
index eeaeda1..de6af0c 100644
--- a/include/adwaitamm/dialog.hpp
+++ b/include/adwaitamm/dialog.hpp
@@ -1,12 +1,16 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_DIALOG_HPP
 #define LIBADWAITAMM_DIALOG_HPP
 
 #include "adwaitamm/breakpoint.hpp"
 #include "helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
 
diff --git a/include/adwaitamm/enums.hpp b/include/adwaitamm/enums.hpp
index 03f5dc9..8cae39d 100644
--- a/include/adwaitamm/enums.hpp
+++ b/include/adwaitamm/enums.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_ENUMS_HPP
 #define LIBADWAITAMM_ENUMS_HPP
 
diff --git a/include/adwaitamm/preferencesdialog.hpp b/include/adwaitamm/preferencesdialog.hpp
index 080651f..cdc1444 100644
--- a/include/adwaitamm/preferencesdialog.hpp
+++ b/include/adwaitamm/preferencesdialog.hpp
@@ -1,17 +1,17 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PREFERENCES_DIALOG_HPP
 #define LIBADWAITAMM_PREFERENCES_DIALOG_HPP
 
+#include "adwaitamm/dialog.hpp"
 #include "adwaitamm/preferencespage.hpp"
-#include "dialog.hpp"
 #include "helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
-#include <glibmm/refptr.h>
-#include <glibmm/ustring.h>
-
-#include <gtkmm/widget.h>
 
 #include <glib-object.h>
 
diff --git a/include/adwaitamm/preferencespage.hpp b/include/adwaitamm/preferencespage.hpp
index 311796f..16ef88a 100644
--- a/include/adwaitamm/preferencespage.hpp
+++ b/include/adwaitamm/preferencespage.hpp
@@ -1,13 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PREFERENCES_PAGE_HPP
 #define LIBADWAITAMM_PREFERENCES_PAGE_HPP
 
 #include "helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
-#include <glibmm/refptr.h>
-#include <glibmm/ustring.h>
 
 #include <gtkmm/widget.h>
 
diff --git a/include/adwaitamm/preferencesrow.hpp b/include/adwaitamm/preferencesrow.hpp
index 3bbaaec..523d3ae 100644
--- a/include/adwaitamm/preferencesrow.hpp
+++ b/include/adwaitamm/preferencesrow.hpp
@@ -1,21 +1,25 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PREFERENCES_ROW_HPP
 #define LIBADWAITAMM_PREFERENCES_ROW_HPP
 
 #include "helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
-#include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
 
 #include <gtkmm/listboxrow.h>
 
 #include <glib-object.h>
 
-using AdwPreferencesRow = struct _AdwPreferencesRow;
-using AdwPreferencesRowClass = struct _AdwPreferencesRowClass;
+#define _ADWAITA_INSIDE
+#include <adw-preferences-row.h>
+#undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
diff --git a/include/adwaitamm/private/actionrow_p.hpp b/include/adwaitamm/private/actionrow_p.hpp
index 5ccce02..b8a24eb 100644
--- a/include/adwaitamm/private/actionrow_p.hpp
+++ b/include/adwaitamm/private/actionrow_p.hpp
@@ -1,20 +1,23 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_ACTION_ROW_P_HPP
 #define LIBADWAITAMM_PRIVATE_ACTION_ROW_P_HPP
 
-#include <sigc++/signal.h>
+#include "adwaitamm/private/preferencesrow_p.hpp"
 
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
 
-#include <glib-object.h>
-
-using AdwActionRow = struct _AdwActionRow;
-using AdwActionRowClass = struct _AdwActionRowClass;
-using AdwPreferencesRowClass = struct _AdwPreferencesRowClass;
+#define _ADWAITA_INSIDE
+#include <adw-action-row.h>
+#undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-
   struct ActionRow_Class : Glib::Class
   {
     using BaseClassParent = AdwPreferencesRowClass;
@@ -27,7 +30,6 @@ namespace Adwaita
     auto static class_init_function(void * gclass, void * data) -> void;
     auto static wrap_new(GObject * object) -> Glib::ObjectBase *;
   };
-
 }  // namespace Adwaita
 
 #endif
\ No newline at end of file
diff --git a/include/adwaitamm/private/alertdialog_p.hpp b/include/adwaitamm/private/alertdialog_p.hpp
index 949b4b8..e9a648b 100644
--- a/include/adwaitamm/private/alertdialog_p.hpp
+++ b/include/adwaitamm/private/alertdialog_p.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later 
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_ALERT_DIALOG_P_HPP
 #define LIBADWAITAMM_PRIVATE_ALERT_DIALOG_P_HPP
 
@@ -6,10 +12,6 @@
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
 
-#include <gtkmm/widget.h>
-
-#include <gtk/gtk.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-alert-dialog.h>
 #undef _ADWAITA_INSIDE
diff --git a/include/adwaitamm/private/application_p.hpp b/include/adwaitamm/private/application_p.hpp
index b9ac5f6..effb8ad 100644
--- a/include/adwaitamm/private/application_p.hpp
+++ b/include/adwaitamm/private/application_p.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later 
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_APPLICATION_P_HPP
 #define LIBADWAITAMM_PRIVATE_APPLICATION_P_HPP
 
@@ -6,23 +12,19 @@
 
 #include <gtkmm/application.h>
 
-#include <gtk/gtk.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-application.h>
 #undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-  struct Application;
-
   struct Application_Class : Glib::Class
   {
     using BaseClassParent = GtkApplicationClass;
     using BaseClassType = AdwApplicationClass;
     using BaseObjectType = AdwApplication;
     using CppClassParent = Gtk::Application_Class;
-    using CppObjectType = Application;
+    using CppObjectType = struct Application;
 
     auto init() -> Glib::Class const &;
     auto static class_init_function(void * gclass, void * data) -> void;
diff --git a/include/adwaitamm/private/applicationwindow_p.hpp b/include/adwaitamm/private/applicationwindow_p.hpp
index d44629e..f96cebd 100644
--- a/include/adwaitamm/private/applicationwindow_p.hpp
+++ b/include/adwaitamm/private/applicationwindow_p.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later 
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_APPLICATION_WINDOW_P_HPP
 #define LIBADWAITAMM_PRIVATE_APPLICATION_WINDOW_P_HPP
 
@@ -6,23 +12,19 @@
 
 #include <gtkmm/applicationwindow.h>
 
-#include <gtk/gtk.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-application-window.h>
 #undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-  struct ApplicationWindow;
-
   struct ApplicationWindow_Class : Glib::Class
   {
     using BaseClassParent = GtkApplicationWindowClass;
     using BaseClassType = AdwApplicationWindowClass;
     using BaseObjectType = AdwApplicationWindow;
     using CppClassParent = Gtk::ApplicationWindow_Class;
-    using CppObjectType = ApplicationWindow;
+    using CppObjectType = struct ApplicationWindow;
 
     auto init() -> Glib::Class const &;
     auto static class_init_function(void * gclass, void * data) -> void;
diff --git a/include/adwaitamm/private/breakpoint_p.hpp b/include/adwaitamm/private/breakpoint_p.hpp
index b4f6bc4..37e745f 100644
--- a/include/adwaitamm/private/breakpoint_p.hpp
+++ b/include/adwaitamm/private/breakpoint_p.hpp
@@ -1,11 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_BREAKPOINT_P_HPP
 #define LIBADWAITAMM_PRIVATE_BREAKPOINT_P_HPP
 
-#include <sigc++/signal.h>
-
 #include <glibmm/class.h>
+#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/private/object_p.h>
 
 #include <glib-object.h>
 
@@ -15,7 +19,6 @@
 
 namespace Adwaita
 {
-
   struct Breakpoint_Class : Glib::Class
   {
     using BaseClassParent = GObjectClass;
@@ -28,7 +31,6 @@ namespace Adwaita
     auto static class_init_function(void * gclass, void * data) -> void;
     auto static wrap_new(GObject * object) -> Glib::ObjectBase *;
   };
-
 }  // namespace Adwaita
 
 #endif
\ No newline at end of file
diff --git a/include/adwaitamm/private/dialog_p.hpp b/include/adwaitamm/private/dialog_p.hpp
index 5f02dba..a8be388 100644
--- a/include/adwaitamm/private/dialog_p.hpp
+++ b/include/adwaitamm/private/dialog_p.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_DIALOG_P_HPP
 #define LIBADWAITAMM_PRIVATE_DIALOG_P_HPP
 
@@ -6,23 +12,19 @@
 
 #include <gtkmm/widget.h>
 
-#include <gtk/gtk.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-dialog.h>
 #undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-  struct Dialog;
-
   struct Dialog_Class : Glib::Class
   {
     using BaseClassParent = GtkWidgetClass;
     using BaseClassType = AdwDialogClass;
     using BaseObjectType = AdwDialog;
     using CppClassParent = Gtk::Widget_Class;
-    using CppObjectType = Dialog;
+    using CppObjectType = struct Dialog;
 
     auto init() -> Glib::Class const &;
     auto static class_init_function(void * gclass, void * data) -> void;
diff --git a/include/adwaitamm/private/preferencesdialog_p.hpp b/include/adwaitamm/private/preferencesdialog_p.hpp
index 14f1038..b146ea6 100644
--- a/include/adwaitamm/private/preferencesdialog_p.hpp
+++ b/include/adwaitamm/private/preferencesdialog_p.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_PREFERENCES_DIALOG_P_HPP
 #define LIBADWAITAMM_PRIVATE_PREFERENCES_DIALOG_P_HPP
 
@@ -6,10 +12,6 @@
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
 
-#include <gtkmm/widget.h>
-
-#include <gtk/gtk.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-preferences-dialog.h>
 #undef _ADWAITA_INSIDE
diff --git a/include/adwaitamm/private/preferencespage_p.hpp b/include/adwaitamm/private/preferencespage_p.hpp
index 0a84a99..adc297e 100644
--- a/include/adwaitamm/private/preferencespage_p.hpp
+++ b/include/adwaitamm/private/preferencespage_p.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_PREFERENCES_PAGE_P_HPP
 #define LIBADWAITAMM_PRIVATE_PREFERENCES_PAGE_P_HPP
 
@@ -6,23 +12,19 @@
 
 #include <gtkmm/widget.h>
 
-#include <gtk/gtk.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-preferences-page.h>
 #undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-  struct PreferencesPage;
-
   struct PreferencesPage_Class : Glib::Class
   {
     using BaseClassParent = GtkWidgetClass;
     using BaseClassType = AdwPreferencesPageClass;
     using BaseObjectType = AdwPreferencesPage;
     using CppClassParent = Gtk::Widget_Class;
-    using CppObjectType = PreferencesPage;
+    using CppObjectType = struct PreferencesPage;
 
     auto init() -> Glib::Class const &;
     auto static class_init_function(void * gclass, void * data) -> void;
diff --git a/include/adwaitamm/private/preferencesrow_p.hpp b/include/adwaitamm/private/preferencesrow_p.hpp
index be0b25b..fd6c22b 100644
--- a/include/adwaitamm/private/preferencesrow_p.hpp
+++ b/include/adwaitamm/private/preferencesrow_p.hpp
@@ -1,36 +1,35 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_PREFERENCES_ROW_P_HPP
 #define LIBADWAITAMM_PRIVATE_PREFERENCES_ROW_P_HPP
 
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
 
-#include <gtk/gtk.h>
-
-using AdwPreferencesRow = struct _AdwPreferencesRow;
-using AdwPreferencesRowClass = struct _AdwPreferencesRowClass;
+#include <gtkmm/listboxrow.h>
 
-namespace Gtk
-{
-  struct ListBoxRow_Class;
-}  // namespace Gtk
+#define _ADWAITA_INSIDE
+#include <adw-preferences-row.h>
+#undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-  struct PreferencesRow;
-
   struct PreferencesRow_Class : Glib::Class
   {
     using BaseClassParent = GtkListBoxRowClass;
     using BaseClassType = AdwPreferencesRowClass;
     using BaseObjectType = AdwPreferencesRow;
     using CppClassParent = Gtk::ListBoxRow_Class;
-    using CppObjectType = PreferencesRow;
+    using CppObjectType = struct PreferencesRow;
 
     auto init() -> Glib::Class const &;
     auto static class_init_function(void * gclass, void * data) -> void;
     auto static wrap_new(GObject * object) -> Glib::ObjectBase *;
   };
-
 }  // namespace Adwaita
 
 #endif
\ No newline at end of file
diff --git a/include/adwaitamm/private/stylemanager_p.hpp b/include/adwaitamm/private/stylemanager_p.hpp
index a37eedd..52bf7a5 100644
--- a/include/adwaitamm/private/stylemanager_p.hpp
+++ b/include/adwaitamm/private/stylemanager_p.hpp
@@ -1,9 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_STYLE_MANAGER_P_HPP
 #define LIBADWAITAMM_PRIVATE_STYLE_MANAGER_P_HPP
 
 #include <glibmm/class.h>
+#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/private/object_p.h>
 
 #include <glib-object.h>
 
@@ -13,7 +19,6 @@
 
 namespace Adwaita
 {
-
   struct StyleManager_Class : Glib::Class
   {
     using BaseClassParent = GObjectClass;
@@ -26,7 +31,6 @@ namespace Adwaita
     auto static class_init_function(void * gclass, void * data) -> void;
     auto static wrap_new(GObject * object) -> Glib::ObjectBase *;
   };
-
 }  // namespace Adwaita
 
 #endif
\ No newline at end of file
diff --git a/include/adwaitamm/private/switchrow_p.hpp b/include/adwaitamm/private/switchrow_p.hpp
index 7c2288b..b1eecc5 100644
--- a/include/adwaitamm/private/switchrow_p.hpp
+++ b/include/adwaitamm/private/switchrow_p.hpp
@@ -1,22 +1,23 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_SWITCH_ROW_P_HPP
 #define LIBADWAITAMM_PRIVATE_SWITCH_ROW_P_HPP
 
 #include "adwaitamm/private/actionrow_p.hpp"
 
-#include <sigc++/signal.h>
-
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
 
-#include <glib-object.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-switch-row.h>
 #undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-
   struct SwitchRow_Class : Glib::Class
   {
     using BaseClassParent = AdwActionRowClass;
@@ -29,7 +30,6 @@ namespace Adwaita
     auto static class_init_function(void * gclass, void * data) -> void;
     auto static wrap_new(GObject * object) -> Glib::ObjectBase *;
   };
-
 }  // namespace Adwaita
 
 #endif
\ No newline at end of file
diff --git a/include/adwaitamm/private/toast_p.hpp b/include/adwaitamm/private/toast_p.hpp
index 2431b32..2f2b420 100644
--- a/include/adwaitamm/private/toast_p.hpp
+++ b/include/adwaitamm/private/toast_p.hpp
@@ -1,11 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_TOAST_P_HPP
 #define LIBADWAITAMM_PRIVATE_TOAST_P_HPP
 
-#include <sigc++/signal.h>
-
 #include <glibmm/class.h>
+#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/private/object_p.h>
 
 #include <glib-object.h>
 
@@ -15,20 +19,18 @@
 
 namespace Adwaita
 {
-
   struct Toast_Class : Glib::Class
   {
     using BaseClassParent = GObjectClass;
     using BaseClassType = AdwToastClass;
     using BaseObjectType = AdwToast;
-    using CppClassParent = struct Glib::Object_Class;
+    using CppClassParent = Glib::Object_Class;
     using CppObjectType = struct Toast;
 
     auto init() -> Glib::Class const &;
     auto static class_init_function(void * gclass, void * data) -> void;
     auto static wrap_new(GObject * object) -> Glib::ObjectBase *;
   };
-
 }  // namespace Adwaita
 
 #endif
\ No newline at end of file
diff --git a/include/adwaitamm/private/toastoverlay_p.hpp b/include/adwaitamm/private/toastoverlay_p.hpp
index 3fa651b..d19ba8e 100644
--- a/include/adwaitamm/private/toastoverlay_p.hpp
+++ b/include/adwaitamm/private/toastoverlay_p.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_PRIVATE_TOAST_OVERLAY_P_HPP
 #define LIBADWAITAMM_PRIVATE_TOAST_OVERLAY_P_HPP
 
@@ -6,23 +12,19 @@
 
 #include <gtkmm/widget.h>
 
-#include <gtk/gtk.h>
-
 #define _ADWAITA_INSIDE
 #include <adw-toast-overlay.h>
 #undef _ADWAITA_INSIDE
 
 namespace Adwaita
 {
-  struct ToastOverlay;
-
   struct ToastOverlay_Class : Glib::Class
   {
     using BaseClassParent = GtkWidgetClass;
     using BaseClassType = AdwToastOverlayClass;
     using BaseObjectType = AdwToastOverlay;
     using CppClassParent = Gtk::Widget_Class;
-    using CppObjectType = ToastOverlay;
+    using CppObjectType = struct ToastOverlay;
 
     auto init() -> Glib::Class const &;
     auto static class_init_function(void * gclass, void * data) -> void;
diff --git a/include/adwaitamm/stylemanager.hpp b/include/adwaitamm/stylemanager.hpp
index 15f0f0e..b735cf0 100644
--- a/include/adwaitamm/stylemanager.hpp
+++ b/include/adwaitamm/stylemanager.hpp
@@ -1,20 +1,21 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_STYLE_MANAGER_HPP
 #define LIBADWAITAMM_STYLE_MANAGER_HPP
 
 #include "adwaitamm/helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
 
-#include <giomm/application.h>
-
-#include <gtkmm/application.h>
-
 #include <gdkmm/display.h>
 #include <gdkmm/rgba.h>
+
 #include <glib-object.h>
 
 #define _ADWAITA_INSIDE
diff --git a/include/adwaitamm/switchrow.hpp b/include/adwaitamm/switchrow.hpp
index c95544e..ddcc3f5 100644
--- a/include/adwaitamm/switchrow.hpp
+++ b/include/adwaitamm/switchrow.hpp
@@ -1,17 +1,17 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_SWITCH_ROW_HPP
 #define LIBADWAITAMM_SWITCH_ROW_HPP
 
-#include "helpers/gobj_mixin.hpp"
 #include "adwaitamm/actionrow.hpp"
+#include "adwaitamm/helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
-#include <glibmm/refptr.h>
-#include <glibmm/ustring.h>
-
-#include <gtkmm/widget.h>
 
 #include <glib-object.h>
 
diff --git a/include/adwaitamm/toast.hpp b/include/adwaitamm/toast.hpp
index 4aee04d..8c84fad 100644
--- a/include/adwaitamm/toast.hpp
+++ b/include/adwaitamm/toast.hpp
@@ -1,12 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_TOAST_HPP
 #define LIBADWAITAMM_TOAST_HPP
 
 #include "adwaitamm/helpers/gobj_mixin.hpp"
 
-#include <sigc++/signal.h>
-
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
 #include <glibmm/refptr.h>
 #include <glibmm/signalproxy.h>
diff --git a/include/adwaitamm/toastoverlay.hpp b/include/adwaitamm/toastoverlay.hpp
index 581d14b..2015cd8 100644
--- a/include/adwaitamm/toastoverlay.hpp
+++ b/include/adwaitamm/toastoverlay.hpp
@@ -1,13 +1,16 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_TOASTOVERLAY_HPP
 #define LIBADWAITAMM_TOASTOVERLAY_HPP
 
 #include "adwaitamm/helpers/gobj_mixin.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
-#include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
-#include <glibmm/refptr.h>
 
 #include <gtkmm/widget.h>
 
diff --git a/include/adwaitamm/wrap_init.hpp b/include/adwaitamm/wrap_init.hpp
index 98e40c3..ae7209d 100644
--- a/include/adwaitamm/wrap_init.hpp
+++ b/include/adwaitamm/wrap_init.hpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #ifndef LIBADWAITAMM_WRAP_INIT_HPP
 #define LIBADWAITAMM_WRAP_INIT_HPP
 
diff --git a/src/actionrow.cpp b/src/actionrow.cpp
index 8242a6e..9c33aec 100644
--- a/src/actionrow.cpp
+++ b/src/actionrow.cpp
@@ -1,33 +1,42 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/actionrow.hpp"
-#include "adwaitamm/private/actionrow_p.hpp"
 
 #include "adwaitamm/preferencesrow.hpp"
+#include "adwaitamm/private/actionrow_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
-#include <glibmm/utility.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/init.h>
-#include <gtkmm/listboxrow.h>
-#include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
 #include <gtkmm/widget.h>
 
-#include <adwaita.h>
 #include <glib-object.h>
 #include <glib.h>
-#include <gtk/gtk.h>
 
 namespace Adwaita
+
 {
   namespace
   {
     auto constinit _class = ActionRow_Class{};
+
+    namespace property_name
+    {
+      auto constexpr activatable_widget = "activatable-widget";
+      auto constexpr icon_name = "icon-name";
+      auto constexpr subtitle = "subtitle";
+      auto constexpr subtitle_lines = "subtitle-lines";
+      auto constexpr subtitle_selectable = "subtitle-selectable";
+      auto constexpr title_lines = "title-lines";
+    }  // namespace property_name
   }  // namespace
 
   auto ActionRow::get_type() -> GType
@@ -139,62 +148,62 @@ namespace Adwaita
 
   auto ActionRow::property_activatable_widget() noexcept -> Glib::PropertyProxy<Gtk::Widget *>
   {
-    return Glib::PropertyProxy<Gtk::Widget *>(this, "activatable-widget");
+    return Glib::PropertyProxy<Gtk::Widget *>(this, property_name::activatable_widget);
   }
 
   auto ActionRow::property_activatable_widget() const noexcept -> Glib::PropertyProxy_ReadOnly<Gtk::Widget *>
   {
-    return Glib::PropertyProxy_ReadOnly<Gtk::Widget *>(this, "activatable-widget");
+    return Glib::PropertyProxy_ReadOnly<Gtk::Widget *>(this, property_name::activatable_widget);
   }
 
   auto ActionRow::property_icon_name() noexcept -> Glib::PropertyProxy<Glib::ustring>
   {
-    return Glib::PropertyProxy<Glib::ustring>(this, "icon-name");
+    return Glib::PropertyProxy<Glib::ustring>(this, property_name::icon_name);
   }
 
   auto ActionRow::property_icon_name() const noexcept -> Glib::PropertyProxy_ReadOnly<Glib::ustring>
   {
-    return Glib::PropertyProxy_ReadOnly<Glib::ustring>(this, "icon-name");
+    return Glib::PropertyProxy_ReadOnly<Glib::ustring>(this, property_name::icon_name);
   }
 
   auto ActionRow::property_subtitle() noexcept -> Glib::PropertyProxy<Glib::ustring>
   {
-    return Glib::PropertyProxy<Glib::ustring>(this, "subtitle");
+    return Glib::PropertyProxy<Glib::ustring>(this, property_name::subtitle);
   }
 
   auto ActionRow::property_subtitle() const noexcept -> Glib::PropertyProxy_ReadOnly<Glib::ustring>
   {
-    return Glib::PropertyProxy_ReadOnly<Glib::ustring>(this, "subtitle");
+    return Glib::PropertyProxy_ReadOnly<Glib::ustring>(this, property_name::subtitle);
   }
 
   auto ActionRow::property_subtitle_lines() noexcept -> Glib::PropertyProxy<int>
   {
-    return Glib::PropertyProxy<int>(this, "subtitle-lines");
+    return Glib::PropertyProxy<int>(this, property_name::subtitle_lines);
   }
 
   auto ActionRow::property_subtitle_lines() const noexcept -> Glib::PropertyProxy_ReadOnly<int>
   {
-    return Glib::PropertyProxy_ReadOnly<int>(this, "subtitle-lines");
+    return Glib::PropertyProxy_ReadOnly<int>(this, property_name::subtitle_lines);
   }
 
   auto ActionRow::property_subtitle_selectable() noexcept -> Glib::PropertyProxy<bool>
   {
-    return Glib::PropertyProxy<bool>(this, "subtitle-selectable");
+    return Glib::PropertyProxy<bool>(this, property_name::subtitle_selectable);
   }
 
   auto ActionRow::property_subtitle_selectable() const noexcept -> Glib::PropertyProxy_ReadOnly<bool>
   {
-    return Glib::PropertyProxy_ReadOnly<bool>(this, "subtitle-selectable");
+    return Glib::PropertyProxy_ReadOnly<bool>(this, property_name::subtitle_selectable);
   }
 
   auto ActionRow::property_title_lines() noexcept -> Glib::PropertyProxy<int>
   {
-    return Glib::PropertyProxy<int>(this, "title-lines");
+    return Glib::PropertyProxy<int>(this, property_name::title_lines);
   }
 
   auto ActionRow::property_title_lines() const noexcept -> Glib::PropertyProxy_ReadOnly<int>
   {
-    return Glib::PropertyProxy_ReadOnly<int>(this, "title-lines");
+    return Glib::PropertyProxy_ReadOnly<int>(this, property_name::title_lines);
   }
 
 }  // namespace Adwaita
diff --git a/src/alertdialog.cpp b/src/alertdialog.cpp
index 24c5705..0e91e68 100644
--- a/src/alertdialog.cpp
+++ b/src/alertdialog.cpp
@@ -1,10 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/alertdialog.hpp"
-#include "adwaitamm/private/alertdialog_p.hpp"
 
 #include "adwaitamm/dialog.hpp"
+#include "adwaitamm/helpers/async_callback.hpp"
+#include "adwaitamm/private/alertdialog_p.hpp"
 
-#include <glibmm/class.h>
-#include <glibmm/exceptionhandler.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 #include <glibmm/refptr.h>
@@ -15,17 +20,9 @@
 #include <giomm/asyncresult.h>
 #include <giomm/cancellable.h>
 
-#include <gtkmm/init.h>
-#include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
 #include <gtkmm/widget.h>
 
-#include <adwaitamm/helpers/async_callback.hpp>
-
-#include <adwaita.h>
 #include <glib-object.h>
-#include <glib.h>
-#include <gtk/gtk.h>
 
 namespace Adwaita
 {
diff --git a/src/application.cpp b/src/application.cpp
index 55caff5..a50d133 100644
--- a/src/application.cpp
+++ b/src/application.cpp
@@ -1,6 +1,12 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/application.hpp"
-#include "adwaitamm/private/application_p.hpp"
 
+#include "adwaitamm/private/application_p.hpp"
 #include "adwaitamm/wrap_init.hpp"
 
 #include <glibmm/class.h>
@@ -8,13 +14,13 @@
 #include <glibmm/objectbase.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
+#include <glibmm/utility.h>
 #include <glibmm/wrap.h>
 
 #include <giomm/application.h>
 
 #include <gtkmm/application.h>
 #include <gtkmm/init.h>
-#include <gtkmm/private/application_p.h>
 
 #include <adwaita.h>
 #include <gio/gio.h>
diff --git a/src/applicationwindow.cpp b/src/applicationwindow.cpp
index 50817d2..5b01cfb 100644
--- a/src/applicationwindow.cpp
+++ b/src/applicationwindow.cpp
@@ -1,22 +1,20 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/applicationwindow.hpp"
 
 #include "adwaitamm/private/applicationwindow_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/refptr.h>
-#include <glibmm/ustring.h>
-#include <glibmm/utility.h>
 #include <glibmm/wrap.h>
 
 #include <gtkmm/application.h>
 #include <gtkmm/applicationwindow.h>
-#include <gtkmm/init.h>
-#include <gtkmm/object.h>
-#include <gtkmm/private/applicationwindow_p.h>
 
-#include <adwaita.h>
 #include <glib-object.h>
 #include <gtk/gtk.h>
 
diff --git a/src/breakpoint.cpp b/src/breakpoint.cpp
index e19db41..be275e1 100644
--- a/src/breakpoint.cpp
+++ b/src/breakpoint.cpp
@@ -1,19 +1,21 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/breakpoint.hpp"
-#include "adwaitamm/private/breakpoint_p.hpp"
 
 #include "adwaitamm/enums.hpp"
+#include "adwaitamm/private/breakpoint_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/private/object_p.h>
 #include <glibmm/propertyproxy.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/buildable.h>
-
 #include <glib-object.h>
 
 #include <optional>
diff --git a/src/dialog.cpp b/src/dialog.cpp
index 6f34d3d..c31fb8a 100644
--- a/src/dialog.cpp
+++ b/src/dialog.cpp
@@ -1,9 +1,14 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/dialog.hpp"
 
 #include "adwaitamm/breakpoint.hpp"
 #include "adwaitamm/private/dialog_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 #include <glibmm/refptr.h>
@@ -11,13 +16,8 @@
 #include <glibmm/utility.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/init.h>
-#include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
-#include <gtkmm/shortcutmanager.h>
 #include <gtkmm/widget.h>
 
-#include <adwaita.h>
 #include <glib-object.h>
 #include <gtk/gtk.h>
 
diff --git a/src/enums.cpp b/src/enums.cpp
index 9261387..bcc8290 100644
--- a/src/enums.cpp
+++ b/src/enums.cpp
@@ -1,6 +1,12 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/enums.hpp"
 
-#include <adwaitamm/stylemanager.hpp>
+#include "adwaitamm/stylemanager.hpp"
 
 #include <adwaita.h>
 #include <glib-object.h>
diff --git a/src/helpers/async_callback.cpp b/src/helpers/async_callback.cpp
index 4f148f0..f8a8b27 100644
--- a/src/helpers/async_callback.cpp
+++ b/src/helpers/async_callback.cpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/helpers/async_callback.hpp"
 
 #include <glibmm/exceptionhandler.h>
diff --git a/src/preferencesdialog.cpp b/src/preferencesdialog.cpp
index 19c9e35..3d70ed5 100644
--- a/src/preferencesdialog.cpp
+++ b/src/preferencesdialog.cpp
@@ -1,25 +1,20 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/preferencesdialog.hpp"
 
 #include "adwaitamm/dialog.hpp"
 #include "adwaitamm/preferencespage.hpp"
 #include "adwaitamm/private/preferencesdialog_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/refptr.h>
-#include <glibmm/ustring.h>
-#include <glibmm/utility.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/init.h>
-#include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
-#include <gtkmm/widget.h>
-
-#include <adwaita.h>
 #include <glib-object.h>
-#include <gtk/gtk.h>
 
 namespace Adwaita
 {
diff --git a/src/preferencespage.cpp b/src/preferencespage.cpp
index 0c10d97..8ad9e8c 100644
--- a/src/preferencespage.cpp
+++ b/src/preferencespage.cpp
@@ -1,21 +1,19 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/preferencespage.hpp"
 
 #include "adwaitamm/private/preferencespage_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/refptr.h>
-#include <glibmm/ustring.h>
-#include <glibmm/utility.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/init.h>
-#include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
 #include <gtkmm/widget.h>
 
-#include <adwaita.h>
 #include <glib-object.h>
 #include <gtk/gtk.h>
 
diff --git a/src/preferencesrow.cpp b/src/preferencesrow.cpp
index e54bebe..898903f 100644
--- a/src/preferencesrow.cpp
+++ b/src/preferencesrow.cpp
@@ -1,22 +1,21 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/preferencesrow.hpp"
 
 #include "adwaitamm/private/preferencesrow_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
-#include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
-#include <glibmm/utility.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/init.h>
 #include <gtkmm/listboxrow.h>
-#include <gtkmm/object.h>
-#include <gtkmm/private/listboxrow_p.h>
 
-#include <adwaita.h>
 #include <glib-object.h>
 #include <gtk/gtk.h>
 
diff --git a/src/private/actionrow_p.cpp b/src/private/actionrow_p.cpp
index 843c330..4a31bc8 100644
--- a/src/private/actionrow_p.cpp
+++ b/src/private/actionrow_p.cpp
@@ -1,7 +1,12 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/actionrow_p.hpp"
 
 #include "adwaitamm/actionrow.hpp"
-#include "adwaitamm/private/preferencesrow_p.hpp"  // IWYU pragma: keep - Required for CppClassParent::
 
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
diff --git a/src/private/alertdialog_p.cpp b/src/private/alertdialog_p.cpp
index 524446f..51cba24 100644
--- a/src/private/alertdialog_p.cpp
+++ b/src/private/alertdialog_p.cpp
@@ -1,14 +1,17 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/alertdialog_p.hpp"
 
 #include "adwaitamm/alertdialog.hpp"
 
 #include <glibmm/class.h>
-#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 
 #include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
-#include <gtkmm/shortcutmanager.h>
 
 #include <adwaita.h>
 
diff --git a/src/private/application_p.cpp b/src/private/application_p.cpp
index 62a0b98..5b841a0 100644
--- a/src/private/application_p.cpp
+++ b/src/private/application_p.cpp
@@ -1,13 +1,20 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/application_p.hpp"
 
 #include "adwaitamm/application.hpp"
 
 #include <glibmm/class.h>
-#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 
 #include <gtkmm/private/application_p.h>
 
+#include <adwaita.h>
+
 namespace Adwaita
 {
   auto Application_Class::init() -> Glib::Class const &
diff --git a/src/private/applicationwindow_p.cpp b/src/private/applicationwindow_p.cpp
index b2ba636..b5d2b19 100644
--- a/src/private/applicationwindow_p.cpp
+++ b/src/private/applicationwindow_p.cpp
@@ -1,13 +1,20 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/applicationwindow_p.hpp"
 
 #include "adwaitamm/applicationwindow.hpp"
 
 #include <glibmm/class.h>
-#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 
 #include <gtkmm/private/applicationwindow_p.h>
 
+#include <adwaita.h>
+
 namespace Adwaita
 {
   auto ApplicationWindow_Class::init() -> Glib::Class const &
diff --git a/src/private/breakpoint_p.cpp b/src/private/breakpoint_p.cpp
index 5a41a31..ed3dda6 100644
--- a/src/private/breakpoint_p.cpp
+++ b/src/private/breakpoint_p.cpp
@@ -1,11 +1,21 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/breakpoint_p.hpp"
 
 #include "adwaitamm/breakpoint.hpp"
 
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
+#include <glibmm/private/object_p.h>
+
 #include <gtkmm/buildable.h>
 
+#include <adwaita.h>
+
 namespace Adwaita
 {
   auto Breakpoint_Class::init() -> Glib::Class const &
diff --git a/src/private/dialog_p.cpp b/src/private/dialog_p.cpp
index da19ddc..e6ac6cd 100644
--- a/src/private/dialog_p.cpp
+++ b/src/private/dialog_p.cpp
@@ -1,9 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/dialog_p.hpp"
 
 #include "adwaitamm/dialog.hpp"
 
 #include <glibmm/class.h>
-#include <glibmm/object.h>
+#include <glibmm/objectbase.h>
 
 #include <gtkmm/object.h>
 #include <gtkmm/private/widget_p.h>
diff --git a/src/private/preferencesdialog_p.cpp b/src/private/preferencesdialog_p.cpp
index f114fa9..14e1aa7 100644
--- a/src/private/preferencesdialog_p.cpp
+++ b/src/private/preferencesdialog_p.cpp
@@ -1,14 +1,17 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/preferencesdialog_p.hpp"
 
 #include "adwaitamm/preferencesdialog.hpp"
 
 #include <glibmm/class.h>
-#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 
 #include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
-#include <gtkmm/shortcutmanager.h>
 
 #include <adwaita.h>
 
diff --git a/src/private/preferencespage_p.cpp b/src/private/preferencespage_p.cpp
index b9d9c59..0a7cd74 100644
--- a/src/private/preferencespage_p.cpp
+++ b/src/private/preferencespage_p.cpp
@@ -1,9 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/preferencespage_p.hpp"
 
 #include "adwaitamm/preferencespage.hpp"
 
 #include <glibmm/class.h>
-#include <glibmm/object.h>
+#include <glibmm/objectbase.h>
 
 #include <gtkmm/object.h>
 #include <gtkmm/private/widget_p.h>
diff --git a/src/private/preferencesrow_p.cpp b/src/private/preferencesrow_p.cpp
index fd5909e..5823d7e 100644
--- a/src/private/preferencesrow_p.cpp
+++ b/src/private/preferencesrow_p.cpp
@@ -1,8 +1,15 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/preferencesrow_p.hpp"
 
 #include "adwaitamm/preferencesrow.hpp"
 
 #include <glibmm/class.h>
+#include <glibmm/objectbase.h>
 
 #include <gtkmm/object.h>
 #include <gtkmm/private/listboxrow_p.h>
diff --git a/src/private/stylemanager_p.cpp b/src/private/stylemanager_p.cpp
index f35c6da..336444a 100644
--- a/src/private/stylemanager_p.cpp
+++ b/src/private/stylemanager_p.cpp
@@ -1,9 +1,18 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/stylemanager_p.hpp"
 
 #include "adwaitamm/stylemanager.hpp"
 
 #include <glibmm/class.h>
 #include <glibmm/objectbase.h>
+#include <glibmm/private/object_p.h>
+
+#include <adwaita.h>
 
 namespace Adwaita
 {
diff --git a/src/private/switch_row_p.cpp b/src/private/switchrow_p.cpp
index 71fdf5b..0f071c4 100644
--- a/src/private/switch_row_p.cpp
+++ b/src/private/switchrow_p.cpp
@@ -1,4 +1,11 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/switchrow_p.hpp"
+
 #include "adwaitamm/switchrow.hpp"
 
 #include <glibmm/class.h>
@@ -7,6 +14,8 @@
 
 #include <gtkmm/object.h>
 
+#include <adwaita.h>
+
 namespace Adwaita
 {
   auto SwitchRow_Class::init() -> Glib::Class const &
diff --git a/src/private/toast_p.cpp b/src/private/toast_p.cpp
index 7138835..e83bc10 100644
--- a/src/private/toast_p.cpp
+++ b/src/private/toast_p.cpp
@@ -1,8 +1,18 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/toast_p.hpp"
 
 #include "adwaitamm/toast.hpp"
 
 #include <glibmm/class.h>
+#include <glibmm/objectbase.h>
+#include <glibmm/private/object_p.h>
+
+#include <adwaita.h>
 
 namespace Adwaita
 {
diff --git a/src/private/toastoverlay_p.cpp b/src/private/toastoverlay_p.cpp
index 744f981..3834a1e 100644
--- a/src/private/toastoverlay_p.cpp
+++ b/src/private/toastoverlay_p.cpp
@@ -1,9 +1,14 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/private/toastoverlay_p.hpp"
 
 #include "adwaitamm/toastoverlay.hpp"
 
 #include <glibmm/class.h>
-#include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 
 #include <gtkmm/object.h>
diff --git a/src/stylemanager.cpp b/src/stylemanager.cpp
index f62a162..c79bcbc 100644
--- a/src/stylemanager.cpp
+++ b/src/stylemanager.cpp
@@ -1,25 +1,24 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/stylemanager.hpp"
-#include "adwaitamm/private/stylemanager_p.hpp"
 
 #include "adwaitamm/enums.hpp"
+#include "adwaitamm/private/stylemanager_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
 #include <glibmm/wrap.h>
 
-#include <giomm/application.h>
-
-#include <gtkmm/application.h>
-#include <gtkmm/init.h>
-#include <gtkmm/private/application_p.h>
-
-#include <adwaita.h>
 #include <gdkmm/display.h>
 #include <gdkmm/rgba.h>
-#include <gio/gio.h>
+
+#include <adwaita.h>
 #include <glib-object.h>
 
 namespace Adwaita
diff --git a/src/switchrow.cpp b/src/switchrow.cpp
index 010c133..e620ee6 100644
--- a/src/switchrow.cpp
+++ b/src/switchrow.cpp
@@ -1,19 +1,19 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/switchrow.hpp"
 
 #include "adwaitamm/actionrow.hpp"
 #include "adwaitamm/private/switchrow_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
-#include <glibmm/refptr.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/object.h>
-
-#include <adwaita.h>
-#include <gio/gio.h>
 #include <glib-object.h>
 
 namespace Adwaita
diff --git a/src/toast.cpp b/src/toast.cpp
index b5cc12c..0a95b09 100644
--- a/src/toast.cpp
+++ b/src/toast.cpp
@@ -1,12 +1,16 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/toast.hpp"
 
 #include "adwaitamm/enums.hpp"
 #include "adwaitamm/private/toast_p.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
-#include <glibmm/private/object_p.h>
 #include <glibmm/propertyproxy.h>
 #include <glibmm/refptr.h>
 #include <glibmm/signalproxy.h>
@@ -17,8 +21,6 @@
 
 #include <gtkmm/widget.h>
 
-#include <adwaita.h>
-#include <gio/gio.h>
 #include <glib-object.h>
 #include <glib.h>
 
diff --git a/src/toastoverlay.cpp b/src/toastoverlay.cpp
index c4e248f..7be0797 100644
--- a/src/toastoverlay.cpp
+++ b/src/toastoverlay.cpp
@@ -1,24 +1,21 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/toastoverlay.hpp"
 
 #include "adwaitamm/private/toastoverlay_p.hpp"
 #include "adwaitamm/toast.hpp"
 
-#include <glibmm/class.h>
 #include <glibmm/object.h>
 #include <glibmm/objectbase.h>
 #include <glibmm/propertyproxy.h>
-#include <glibmm/refptr.h>
-#include <glibmm/ustring.h>
-#include <glibmm/utility.h>
-#include <glibmm/variant.h>
 #include <glibmm/wrap.h>
 
-#include <gtkmm/object.h>
-#include <gtkmm/private/widget_p.h>
 #include <gtkmm/widget.h>
 
-#include <adwaita.h>
-#include <gio/gio.h>
 #include <glib-object.h>
 
 namespace Adwaita
diff --git a/src/wrap_init.cpp b/src/wrap_init.cpp
index d00105c..9a9d372 100644
--- a/src/wrap_init.cpp
+++ b/src/wrap_init.cpp
@@ -1,3 +1,9 @@
+/**
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @copyright Copyright (c) 2025
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
 #include "adwaitamm/wrap_init.hpp"
 
 #include "adwaitamm/actionrow.hpp"
@@ -9,15 +15,15 @@
 #include "adwaitamm/preferencesdialog.hpp"
 #include "adwaitamm/preferencespage.hpp"
 #include "adwaitamm/preferencesrow.hpp"
-#include "adwaitamm/private/actionrow_p.hpp"
-#include "adwaitamm/private/alertdialog_p.hpp"
-#include "adwaitamm/private/application_p.hpp"
-#include "adwaitamm/private/applicationwindow_p.hpp"
-#include "adwaitamm/private/breakpoint_p.hpp"
-#include "adwaitamm/private/dialog_p.hpp"
-#include "adwaitamm/private/preferencesdialog_p.hpp"
-#include "adwaitamm/private/preferencespage_p.hpp"
-#include "adwaitamm/private/preferencesrow_p.hpp"
+#include "adwaitamm/private/actionrow_p.hpp"          // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/alertdialog_p.hpp"        // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/application_p.hpp"        // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/applicationwindow_p.hpp"  // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/breakpoint_p.hpp"         // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/dialog_p.hpp"             // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/preferencesdialog_p.hpp"  // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/preferencespage_p.hpp"    // IWYU pragma: keep - required for gobj class definition.
+#include "adwaitamm/private/preferencesrow_p.hpp"     // IWYU pragma: keep - required for gobj class definition.
 #include "adwaitamm/private/stylemanager_p.hpp"
 #include "adwaitamm/private/switchrow_p.hpp"
 #include "adwaitamm/private/toast_p.hpp"