1 files changed, 20 insertions, 17 deletions
diff --git a/src/widgets/widgets/qdockwidget_p.h b/src/widgets/widgets/qdockwidget_p.h
index 766e4ed161..bc6ac86c45 100644
--- a/src/widgets/widgets/qdockwidget_p.h
+++ b/src/widgets/widgets/qdockwidget_p.h
@@ -57,6 +57,10 @@
 #include "QtWidgets/qboxlayout.h"
 #include "QtWidgets/qdockwidget.h"
 
+#if QT_CONFIG(tabwidget)
+#  include "QtWidgets/qtabwidget.h"
+#endif
+
 QT_REQUIRE_CONFIG(dockwidget);
 
 QT_BEGIN_NAMESPACE
@@ -81,33 +85,32 @@ class QDockWidgetPrivate : public QWidgetPrivate
     };
 
 public:
-    inline QDockWidgetPrivate()
-        : QWidgetPrivate(), state(0),
-          features(QDockWidget::DockWidgetClosable
-                   | QDockWidget::DockWidgetMovable
-                   | QDockWidget::DockWidgetFloatable),
-          allowedAreas(Qt::AllDockWidgetAreas), resizer(0)
-    { }
-
     void init();
     void _q_toggleView(bool); // private slot
     void _q_toggleTopLevel(); // private slot
 
     void updateButtons();
-    DragState *state;
 
-    QDockWidget::DockWidgetFeatures features;
-    Qt::DockWidgetAreas allowedAreas;
+#if QT_CONFIG(tabwidget)
+    QTabWidget::TabPosition tabPosition = QTabWidget::North;
+#endif
+
+    DragState *state = nullptr;
+
+    QDockWidget::DockWidgetFeatures features = QDockWidget::DockWidgetClosable
+        | QDockWidget::DockWidgetMovable | QDockWidget::DockWidgetFloatable;
+    Qt::DockWidgetAreas allowedAreas = Qt::AllDockWidgetAreas;
 
     QFont font;
 
 #ifndef QT_NO_ACTION
-    QAction *toggleViewAction;
+    QAction *toggleViewAction = nullptr;
 #endif
 
 //    QMainWindow *findMainWindow(QWidget *widget) const;
     QRect undockedGeometry;
     QString fixedWindowTitle;
+    QString dockedWindowTitle;
 
     bool mousePressEvent(QMouseEvent *event);
     bool mouseDoubleClickEvent(QMouseEvent *event);
@@ -128,14 +131,14 @@ public:
     bool isAnimating() const;
 
 private:
-    QWidgetResizeHandler *resizer;
+    QWidgetResizeHandler *resizer = nullptr;
 };
 
 class Q_WIDGETS_EXPORT QDockWidgetLayout : public QLayout
 {
     Q_OBJECT
 public:
-    QDockWidgetLayout(QWidget *parent = 0);
+    QDockWidgetLayout(QWidget *parent = nullptr);
     ~QDockWidgetLayout();
     void addItem(QLayoutItem *item) override;
     QLayoutItem *itemAt(int index) const override;
@@ -193,15 +196,15 @@ inline QLayoutItem *QDockWidgetItem::dockWidgetChildItem() const
 {
     if (QDockWidgetLayout *layout = dockWidgetLayout())
         return layout->itemForRole(QDockWidgetLayout::Content);
-    return 0;
+    return nullptr;
 }
 
 inline QDockWidgetLayout *QDockWidgetItem::dockWidgetLayout() const
 {
     QWidget *w = const_cast<QDockWidgetItem*>(this)->widget();
-    if (w != 0)
+    if (w != nullptr)
         return qobject_cast<QDockWidgetLayout*>(w->layout());
-    return 0;
+    return nullptr;
 }
 
 QT_END_NAMESPACE