1 files changed, 66 insertions, 5 deletions

diff --git a/src/gui/widgets/qmainwindow.cpp b/src/gui/widgets/qmainwindow.cpp
index 0378d2d485..4ca11b039f 100644
--- a/src/gui/widgets/qmainwindow.cpp
+++ b/src/gui/widgets/qmainwindow.cpp
@@ -39,6 +39,8 @@
 **
 ****************************************************************************/
 
+//#define QT_EXPERIMENTAL_CLIENT_DECORATIONS
+
 #include "qmainwindow.h"
 #include "qmainwindowlayout_p.h"
 
@@ -99,12 +101,70 @@ public:
     uint hasOldCursor : 1;
     uint cursorAdjusted : 1;
 #endif
+
+    static inline QMainWindowLayout *mainWindowLayout(const QMainWindow *mainWindow)
+    {
+        return mainWindow ? mainWindow->d_func()->layout : static_cast<QMainWindowLayout *>(0);
+    }
 };
 
+QMainWindowLayout *qt_mainwindow_layout(const QMainWindow *mainWindow)
+{
+    return QMainWindowPrivate::mainWindowLayout(mainWindow);
+}
+
+#ifdef QT_EXPERIMENTAL_CLIENT_DECORATIONS
+Q_GUI_EXPORT void qt_setMainWindowTitleWidget(QMainWindow *mainWindow, Qt::DockWidgetArea area, QWidget *widget)
+{
+    QGridLayout *topLayout = qobject_cast<QGridLayout *>(mainWindow->layout());
+    Q_ASSERT(topLayout);
+
+    int row = 0;
+    int column = 0;
+
+    switch (area) {
+    case Qt::LeftDockWidgetArea:
+        row = 1;
+        column = 0;
+        break;
+    case Qt::TopDockWidgetArea:
+        row = 0;
+        column = 1;
+        break;
+    case Qt::BottomDockWidgetArea:
+        row = 2;
+        column = 1;
+        break;
+    case Qt::RightDockWidgetArea:
+        row = 1;
+        column = 2;
+        break;
+    default:
+        Q_ASSERT_X(false, "qt_setMainWindowTitleWidget", "Unknown area");
+        return;
+    }
+
+    if (QLayoutItem *oldItem = topLayout->itemAtPosition(row, column))
+        delete oldItem->widget();
+    topLayout->addWidget(widget, row, column);
+}
+#endif
+
 void QMainWindowPrivate::init()
 {
     Q_Q(QMainWindow);
-    layout = new QMainWindowLayout(q);
+
+#ifdef QT_EXPERIMENTAL_CLIENT_DECORATIONS
+    QGridLayout *topLayout = new QGridLayout(q);
+    topLayout->setContentsMargins(0, 0, 0, 0);
+
+    layout = new QMainWindowLayout(q, topLayout);
+
+    topLayout->addItem(layout, 1, 1);
+#else
+    layout = new QMainWindowLayout(q, 0);
+#endif
+
     const int metric = q->style()->pixelMetric(QStyle::PM_ToolBarIconSize, 0, q);
     iconSize = QSize(metric, metric);
     q->setAttribute(Qt::WA_Hover);
@@ -461,10 +521,11 @@ QMenuBar *QMainWindow::menuBar() const
 */
 void QMainWindow::setMenuBar(QMenuBar *menuBar)
 {
-    Q_D(QMainWindow);
-    if (d->layout->menuBar() && d->layout->menuBar() != menuBar) {
+    QLayout *topLayout = layout();
+
+    if (topLayout->menuBar() && topLayout->menuBar() != menuBar) {
         // Reparent corner widgets before we delete the old menu bar.
-        QMenuBar *oldMenuBar = qobject_cast<QMenuBar *>(d->layout->menuBar());
+        QMenuBar *oldMenuBar = qobject_cast<QMenuBar *>(topLayout->menuBar());
         if (menuBar) {
             // TopLeftCorner widget.
             QWidget *cornerWidget = oldMenuBar->cornerWidget(Qt::TopLeftCorner);
@@ -478,7 +539,7 @@ void QMainWindow::setMenuBar(QMenuBar *menuBar)
         oldMenuBar->hide();
         oldMenuBar->deleteLater();
     }
-    d->layout->setMenuBar(menuBar);
+    topLayout->setMenuBar(menuBar);
 }
 
 /*!