Add DockWidget::Option_NonDockable

A dock widget with this option will always be floating and not be
able to dock into anything. Other widgets can't dock into it either.

examples/dockwidgets/MyMainWindow.cpp

@@ -49,10 +49,11 @@ static MyWidget *newMyWidget()
 }
 
 MyMainWindow::MyMainWindow(const QString &uniqueName, KDDockWidgets::MainWindowOptions options,
-                           bool dockWidget0IsNonClosable, bool restoreIsRelative,
+                           bool dockWidget0IsNonClosable, bool nonDockableDockWidget9, bool restoreIsRelative,
                            const QString &affinityName, QWidget *parent)
     : MainWindow(uniqueName, options, parent)
     , m_dockWidget0IsNonClosable(dockWidget0IsNonClosable)
+    , m_dockWidget9IsNonDockable(nonDockableDockWidget9)
     , m_restoreIsRelative(restoreIsRelative)
 {
     // qApp->installEventFilter(this);
@@ -112,8 +113,11 @@ void MyMainWindow::createDockWidgets()
 {
     Q_ASSERT(m_dockwidgets.isEmpty());
 
+    const int numDockWidgets = m_dockWidget9IsNonDockable ? 10 : 9;
+
+
     // Create 9 KDDockWidget::DockWidget and the respective widgets they're hosting (MyWidget instances)
-    for (int i = 0; i < 9; i++)
+    for (int i = 0; i < numDockWidgets; i++)
         m_dockwidgets << newDockWidget();
 
 
@@ -150,6 +154,9 @@ KDDockWidgets::DockWidgetBase *MyMainWindow::newDockWidget()
     if (count == 0 && m_dockWidget0IsNonClosable)
         options |= KDDockWidgets::DockWidget::Option_NotClosable;
 
+    if (count == 9 && m_dockWidget9IsNonDockable)
+        options |= KDDockWidgets::DockWidget::Option_NotDockable;
+
     auto dock = new KDDockWidgets::DockWidget(QStringLiteral("DockWidget #%1").arg(count), options);
     dock->setAffinityName(affinityName()); // optional, just to show the feature. Pass -mi to the example to see incompatible dock widgets
 
@@ -157,7 +164,14 @@ KDDockWidgets::DockWidgetBase *MyMainWindow::newDockWidget()
         dock->setIcon(QIcon::fromTheme(QStringLiteral("mail-message")));
     auto myWidget = newMyWidget();
     dock->setWidget(myWidget);
-    dock->setTitle(QStringLiteral("DockWidget #%1").arg(count));
+
+
+    if (dock->options() & KDDockWidgets::DockWidget::Option_NotDockable) {
+        dock->setTitle(QStringLiteral("DockWidget #%1 (%2)").arg(count).arg("non dockable"));
+    } else {
+        dock->setTitle(QStringLiteral("DockWidget #%1").arg(count));
+    }
+
     dock->resize(600, 600);
     dock->show();
     m_toggleMenu->addAction(dock->toggleAction());

examples/dockwidgets/MyMainWindow.h

@@ -28,7 +28,7 @@ class MyMainWindow : public KDDockWidgets::MainWindow
     Q_OBJECT
 public:
     explicit MyMainWindow(const QString &uniqueName, KDDockWidgets::MainWindowOptions options,
-                          bool dockWidget0IsNonClosable, bool restoreIsRelative,
+                          bool dockWidget0IsNonClosable, bool nonDockableDockWidget9, bool restoreIsRelative,
                           const QString &affinityName = {}, // Usually not needed. Just here to show the feature.
                           QWidget *parent = nullptr);
 
@@ -37,6 +37,7 @@ private:
     KDDockWidgets::DockWidgetBase* newDockWidget();
     QMenu *m_toggleMenu = nullptr;
     const bool m_dockWidget0IsNonClosable;
+    const bool m_dockWidget9IsNonDockable;
     const bool m_restoreIsRelative;
     KDDockWidgets::DockWidget::List m_dockwidgets;
 };

examples/dockwidgets/main.cpp

@@ -76,6 +76,9 @@ int main(int argc, char **argv)
     QCommandLineOption doubleClickMaximize("x", QCoreApplication::translate("main", "Double clicking a title bar will maximize a floating window"));
     parser.addOption(doubleClickMaximize);
 
+    QCommandLineOption nonDockable("d", QCoreApplication::translate("main", "DockWidget #9 will be non-dockable"));
+    parser.addOption(nonDockable);
+
 #if defined(DOCKS_DEVELOPER_MODE)
     QCommandLineOption noCentralFrame("c", QCoreApplication::translate("main", "No central frame"));
     parser.addOption(noCentralFrame);
@@ -122,8 +125,9 @@ int main(int argc, char **argv)
 
     const bool nonClosableDockWidget0 = parser.isSet(nonClosableDockWidget);
     const bool restoreIsRelative = parser.isSet(relativeRestore);
+    const bool nonDockableDockWidget9 = parser.isSet(nonDockable);
 
-    MyMainWindow mainWindow(QStringLiteral("MyMainWindow"), options, nonClosableDockWidget0, restoreIsRelative);
+    MyMainWindow mainWindow(QStringLiteral("MyMainWindow"), options, nonClosableDockWidget0, nonDockableDockWidget9, restoreIsRelative);
     mainWindow.setWindowTitle("Main Window 1");
     mainWindow.resize(1200, 1200);
     mainWindow.show();
@@ -135,7 +139,7 @@ int main(int argc, char **argv)
                                                                        : QString();
 
         auto mainWindow2 = new MyMainWindow(QStringLiteral("MyMainWindow-2"), options,
-                                            nonClosableDockWidget0, restoreIsRelative, affinity);
+                                            nonClosableDockWidget0, nonDockableDockWidget9, restoreIsRelative, affinity);
         if (affinity.isEmpty())
             mainWindow2->setWindowTitle("Main Window 2");
         else