4 files changed, 12 insertions, 12 deletions
diff --git a/src/plugins/platformthemes/gtk3/main.cpp b/src/plugins/platformthemes/gtk3/main.cpp
index fb1c425d8e..860fc3a26e 100644
--- a/src/plugins/platformthemes/gtk3/main.cpp
+++ b/src/plugins/platformthemes/gtk3/main.cpp
@@ -57,7 +57,7 @@ QPlatformTheme *QGtk3ThemePlugin::create(const QString &key, const QStringList &
     if (!key.compare(QLatin1String(QGtk3Theme::name), Qt::CaseInsensitive))
         return new QGtk3Theme;
 
-    return 0;
+    return nullptr;
 }
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platformthemes/gtk3/qgtk3dialoghelpers.cpp b/src/plugins/platformthemes/gtk3/qgtk3dialoghelpers.cpp
index c64a02fa0c..65564b59a1 100644
--- a/src/plugins/platformthemes/gtk3/qgtk3dialoghelpers.cpp
+++ b/src/plugins/platformthemes/gtk3/qgtk3dialoghelpers.cpp
@@ -165,12 +165,12 @@ void QGtk3Dialog::onResponse(QGtk3Dialog *dialog, int response)
 void QGtk3Dialog::onParentWindowDestroyed()
 {
     // The QGtk3*DialogHelper classes own this object. Make sure the parent doesn't delete it.
-    setParent(0);
+    setParent(nullptr);
 }
 
 QGtk3ColorDialogHelper::QGtk3ColorDialogHelper()
 {
-    d.reset(new QGtk3Dialog(gtk_color_chooser_dialog_new("", 0)));
+    d.reset(new QGtk3Dialog(gtk_color_chooser_dialog_new("", nullptr)));
     connect(d.data(), SIGNAL(accept()), this, SLOT(onAccepted()));
     connect(d.data(), SIGNAL(reject()), this, SIGNAL(reject()));
 
@@ -238,7 +238,7 @@ void QGtk3ColorDialogHelper::applyOptions()
 
 QGtk3FileDialogHelper::QGtk3FileDialogHelper()
 {
-    d.reset(new QGtk3Dialog(gtk_file_chooser_dialog_new("", 0,
+    d.reset(new QGtk3Dialog(gtk_file_chooser_dialog_new("", nullptr,
                                                         GTK_FILE_CHOOSER_ACTION_OPEN,
                                                         qUtf8Printable(QGtk3Theme::defaultStandardButtonText(QPlatformDialogHelper::Cancel)), GTK_RESPONSE_CANCEL,
                                                         qUtf8Printable(QGtk3Theme::defaultStandardButtonText(QPlatformDialogHelper::Ok)), GTK_RESPONSE_OK,
@@ -497,7 +497,7 @@ void QGtk3FileDialogHelper::setNameFilters(const QStringList &filters)
 
 QGtk3FontDialogHelper::QGtk3FontDialogHelper()
 {
-    d.reset(new QGtk3Dialog(gtk_font_chooser_dialog_new("", 0)));
+    d.reset(new QGtk3Dialog(gtk_font_chooser_dialog_new("", nullptr)));
     connect(d.data(), SIGNAL(accept()), this, SLOT(onAccepted()));
     connect(d.data(), SIGNAL(reject()), this, SIGNAL(reject()));
 
diff --git a/src/plugins/platformthemes/gtk3/qgtk3menu.cpp b/src/plugins/platformthemes/gtk3/qgtk3menu.cpp
index 4f0bd9d9a0..d9d117faeb 100644
--- a/src/plugins/platformthemes/gtk3/qgtk3menu.cpp
+++ b/src/plugins/platformthemes/gtk3/qgtk3menu.cpp
@@ -200,7 +200,7 @@ void QGtk3MenuItem::setMenu(QPlatformMenu *menu)
 {
     m_menu = qobject_cast<QGtk3Menu *>(menu);
     if (GTK_IS_MENU_ITEM(m_item))
-        gtk_menu_item_set_submenu(GTK_MENU_ITEM(m_item), m_menu ? m_menu->handle() : NULL);
+        gtk_menu_item_set_submenu(GTK_MENU_ITEM(m_item), m_menu ? m_menu->handle() : nullptr);
 }
 
 bool QGtk3MenuItem::isVisible() const
@@ -436,7 +436,7 @@ void QGtk3Menu::showPopup(const QWindow *parentWindow, const QRect &targetRect,
     if (pw)
         m_targetPos = pw->mapToGlobal(m_targetPos);
 
-    gtk_menu_popup(GTK_MENU(m_menu), NULL, NULL, qt_gtk_menu_position_func, this, 0, gtk_get_current_event_time());
+    gtk_menu_popup(GTK_MENU(m_menu), nullptr, nullptr, qt_gtk_menu_position_func, this, 0, gtk_get_current_event_time());
 }
 
 void QGtk3Menu::dismiss()
diff --git a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
index 077955eb4e..93520344f8 100644
--- a/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
+++ b/src/plugins/platformthemes/gtk3/qgtk3theme.cpp
@@ -86,9 +86,9 @@ QGtk3Theme::QGtk3Theme()
 {
     // gtk_init will reset the Xlib error handler, and that causes
     // Qt applications to quit on X errors. Therefore, we need to manually restore it.
-    int (*oldErrorHandler)(Display *, XErrorEvent *) = XSetErrorHandler(NULL);
+    int (*oldErrorHandler)(Display *, XErrorEvent *) = XSetErrorHandler(nullptr);
 
-    gtk_init(0, 0);
+    gtk_init(nullptr, nullptr);
 
     XSetErrorHandler(oldErrorHandler);
 
@@ -99,7 +99,7 @@ QGtk3Theme::QGtk3Theme()
     g_type_ensure(PANGO_TYPE_FONT_FACE);
 
     /* Use our custom log handler. */
-    g_log_set_handler("Gtk", G_LOG_LEVEL_MESSAGE, gtkMessageHandler, NULL);
+    g_log_set_handler("Gtk", G_LOG_LEVEL_MESSAGE, gtkMessageHandler, nullptr);
 }
 
 static inline QVariant gtkGetLongPressTime()
@@ -173,7 +173,7 @@ QPlatformDialogHelper *QGtk3Theme::createPlatformDialogHelper(DialogType type) c
     case FontDialog:
         return new QGtk3FontDialogHelper;
     default:
-        return 0;
+        return nullptr;
     }
 }
 
@@ -197,7 +197,7 @@ bool QGtk3Theme::useNativeFileDialog()
      * dialogs entirely since we can't avoid creation of a platform
      * dialog helper.
      */
-    return gtk_check_version(3, 15, 5) == 0;
+    return gtk_check_version(3, 15, 5) == nullptr;
 }
 
 QT_END_NAMESPACE