Add QPlatformWindow::setWindowModified(bool)

Mac OS X provided a platform API for marking a window/document as
modified. This previously worked in Qt 4, so we need to have an
interface to keep this working in Qt 5. If the platform window does not
provide an implementation, fallback to setting the window title.

Note that this does not add any QWindow API, it's only in
QPlatformWindow.

Change-Id: I84c5a5df8536859157f2b1fa9e4cc647a09fd06d
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>

3 files changed, 21 insertions, 10 deletions

diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 662c9b7403..ddab66944e 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -10322,20 +10322,30 @@ void QWidget::setWindowModified(bool mod)
     Q_D(QWidget);
     setAttribute(Qt::WA_WindowModified, mod);
 
-#ifndef Q_WS_MAC
-    if (!windowTitle().contains(QLatin1String("[*]")) && mod)
-        qWarning("QWidget::setWindowModified: The window title does not contain a '[*]' placeholder");
-#endif
-    d->setWindowTitle_helper(windowTitle());
-    d->setWindowIconText_helper(windowIconText());
-#ifdef Q_WS_MAC
-    d->setWindowModified_sys(mod);
-#endif
+    d->setWindowModified_helper();
 
     QEvent e(QEvent::ModifiedChange);
     QApplication::sendEvent(this, &e);
 }
 
+void QWidgetPrivate::setWindowModified_helper()
+{
+    Q_Q(QWidget);
+    QWindow *window = q->windowHandle();
+    if (!window)
+        return;
+    QPlatformWindow *platformWindow = window->handle();
+    if (!platformWindow)
+        return;
+    bool on = q->testAttribute(Qt::WA_WindowModified);
+    if (!platformWindow->setWindowModified(on)) {
+        if (!q->windowTitle().contains(QLatin1String("[*]")) && on)
+            qWarning("QWidget::setWindowModified: The window title does not contain a '[*]' placeholder");
+        setWindowTitle_helper(q->windowTitle());
+        setWindowIconText_helper(q->windowIconText());
+    }
+}
+
 #ifndef QT_NO_TOOLTIP
 /*!
   \property QWidget::toolTip
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index d3fcdce6a8..d7c0ec75b0 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -466,6 +466,7 @@ public:
 
     void setWindowTitle_helper(const QString &cap);
     void setWindowFilePath_helper(const QString &filePath);
+    void setWindowModified_helper();
 
     bool setMinimumSize_helper(int &minw, int &minh);
     bool setMaximumSize_helper(int &maxw, int &maxh);
@@ -745,7 +746,6 @@ public:
     void update_sys(const QRect &rect);
     void update_sys(const QRegion &rgn);
     void setGeometry_sys_helper(int, int, int, int, bool);
-    void setWindowModified_sys(bool b);
     void updateMaximizeButton_sys();
     void setWindowFilePath_sys(const QString &filePath);
     void createWindow_sys();
diff --git a/src/widgets/kernel/qwidget_qpa.cpp b/src/widgets/kernel/qwidget_qpa.cpp
index 4fe7ad6dc7..6b6dd12703 100644
--- a/src/widgets/kernel/qwidget_qpa.cpp
+++ b/src/widgets/kernel/qwidget_qpa.cpp
@@ -140,6 +140,7 @@ void QWidgetPrivate::create_sys(WId window, bool initializeWindow, bool destroyO
             q->setAttribute(Qt::WA_PaintOnScreen, true);
     }
 
+    setWindowModified_helper();
     setWinId(win->winId());
 
 //    first check children. and create them if necessary