ClassView: Use recent setup pattern

Change-Id: I5bb27e64a1662120d799db9c5ea68179cc93ebed
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/classview/classviewmanager.cpp

@@ -15,6 +15,8 @@
 
 #include <texteditor/texteditor.h>
 
+#include <utils/shutdownguard.h>
+
 #include <QThread>
 #include <QTimer>
 
@@ -137,9 +139,8 @@ ParserTreeItem::ConstPtr ManagerPrivate::findItemByRoot(const QStandardItem *ite
 
 ///////////////////////////////// Manager //////////////////////////////////
 
-Manager::Manager(QObject *parent)
-    : QObject(parent),
-    d(new ManagerPrivate())
+Manager::Manager()
+    : d(new ManagerPrivate())
 {
     d->m_parser = new Parser();
     d->m_parser->moveToThread(&d->m_parserThread);
@@ -403,9 +404,9 @@ void Manager::setFlatMode(bool flat)
     }, Qt::QueuedConnection);
 }
 
-void setupClassViewManager(QObject *guard)
+void setupClassViewManager()
 {
-    (void) new Manager(guard);
+    static GuardedObject<Manager> theClassViewManager;
 }
 
 } // ClassView::Internal

src/plugins/classview/classviewmanager.h

@@ -16,7 +16,7 @@ class Manager final : public QObject
 {
     Q_OBJECT
 public:
-    explicit Manager(QObject *parent);
+    Manager();
     ~Manager() final;
 
     static Manager *instance();
@@ -42,6 +42,6 @@ private:
     ManagerPrivate *d;
 };
 
-void setupClassViewManager(QObject *guard);
+void setupClassViewManager();
 
 } // ClassView::Internal

src/plugins/classview/classviewplugin.cpp

@@ -26,7 +26,7 @@ class ClassViewPlugin final : public ExtensionSystem::IPlugin
     void initialize() final
     {
         setupClassViewNavigationWidgetFactory();
-        setupClassViewManager(this);
+        setupClassViewManager();
     }
 };
 

src/plugins/languageclient/languageclientplugin.cpp

@@ -50,7 +50,7 @@ void LanguageClientPlugin::initialize()
     setupCallHierarchyFactory();
     setupTypeHierarchyFactory();
     setupLanguageClientProjectPanel();
-    setupLanguageClientManager(this);
+    setupLanguageClientManager();
     setupLanguageClientOutline();
 
 #ifdef WITH_TESTS