Extend qDebug functionality for QDockWidget

Add features and floating flag to QDockWidget debugging.
Debug dockwidget parents of a group window.

Task-number: QTBUG-118578
Task-number: QTBUG-118579
Change-Id: If2a6caacf5d02f9018c2a3073fdbc1de39bce1ee
Reviewed-by: Santhosh Kumar <santhosh.kumar.selvaraj@qt.io>
Reviewed-by: Keith Kyzivat <keith.kyzivat@qt.io>
(cherry picked from commit bbeff2a3350dd3396400865525d509b784c2d93e)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/widgets/widgets/qdockarealayout.cpp

@@ -172,13 +172,27 @@ QDockAreaLayoutItem
 }
 
 #ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug dbg, const QDockAreaLayoutItem *item)
+{
+    QDebugStateSaver saver(dbg);
+    dbg.nospace();
+    return item ? dbg << *item : dbg << "QDockAreaLayoutItem(0x0)";
+}
+
 QDebug operator<<(QDebug dbg, const QDockAreaLayoutItem &item)
 {
     QDebugStateSaver saver(dbg);
     dbg.nospace();
     dbg << "QDockAreaLayoutItem(" << static_cast<const void *>(&item) << "->";
     if (item.widgetItem) {
-        dbg << "widgetItem(" << item.widgetItem->widget() << ")";
+        QWidget *widget = item.widgetItem->widget();
+        if (auto *dockWidget = qobject_cast<QDockWidget *>(widget)) {
+            dbg << "widgetItem(" << dockWidget << ")";
+        } else if (auto *groupWindow = qobject_cast<QDockWidgetGroupWindow *>(widget)) {
+            dbg << "widgetItem(" << groupWindow << "->(" << groupWindow->dockWidgets() << "))";
+        } else {
+            dbg << "widgetItem(" << widget << ")";
+        }
     } else if (item.subinfo) {
         dbg << "subInfo(" << item.subinfo << "->(" << item.subinfo->item_list << ")";
     } else if (item.placeHolderItem) {

src/widgets/widgets/qdockarealayout_p.h

@@ -75,6 +75,7 @@ struct Q_AUTOTEST_EXPORT QDockAreaLayoutItem
     uint flags;
 #ifndef QT_NO_DEBUG_STREAM
     friend Q_AUTOTEST_EXPORT QDebug operator<<(QDebug dbg, const QDockAreaLayoutItem &item);
+    friend Q_AUTOTEST_EXPORT QDebug operator<<(QDebug dbg, const QDockAreaLayoutItem *item);
 #endif
 };
 

src/widgets/widgets/qdockwidget.cpp

@@ -1816,6 +1816,27 @@ QWidget *QDockWidget::titleBarWidget() const
     return layout->widgetForRole(QDockWidgetLayout::TitleBar);
 }
 
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug dbg, const QDockWidget *dockWidget)
+{
+    QDebugStateSaver saver(dbg);
+    dbg.nospace();
+    return dockWidget ? dbg << *dockWidget : dbg << "QDockWidget(0x0)";
+}
+
+QDebug operator<<(QDebug dbg, const QDockWidget &dockWidget)
+{
+    QDebugStateSaver saver(dbg);
+    dbg.nospace();
+    dbg << "QDockWidget(" << static_cast<const void *>(&dockWidget);
+    dbg << "->(ObjectName=" << dockWidget.objectName();
+    dbg << "; floating=" << dockWidget.isFloating();
+    dbg << "; features=" << dockWidget.features();
+    dbg << ";))";
+    return dbg;
+}
+#endif // QT_NO_DEBUG_STREAM
+
 QT_END_NAMESPACE
 
 #include "qdockwidget.moc"

src/widgets/widgets/qdockwidget.h

@@ -64,6 +64,11 @@ public:
     inline bool isAreaAllowed(Qt::DockWidgetArea area) const
     { return (allowedAreas() & area) == area; }
 
+#ifndef QT_NO_DEBUG_STREAM
+    friend Q_AUTOTEST_EXPORT QDebug operator<<(QDebug dbg, const QDockWidget &dockWidget);
+    friend Q_AUTOTEST_EXPORT QDebug operator<<(QDebug dbg, const QDockWidget *dockWidget);
+#endif
+
 #ifndef QT_NO_ACTION
     QAction *toggleViewAction() const;
 #endif

src/widgets/widgets/qmainwindowlayout_p.h

@@ -324,6 +324,7 @@ public:
     void updateCurrentGapRect();
     void restore();
     void apply();
+    QList<QDockWidget *> dockWidgets() const { return findChildren<QDockWidget *>(); }
 
     QRect currentGapRect;
     QList<int> currentGapPos;