Core: Cut explicit interface between MainWindow and StatusBarManager

Mechanical in preparation of 'static pattern' and avoiding the
object pool objectAdded/objectAboutToBeRemoved use

Change-Id: I1e3fc7f67c785410686d0dc7c083024e305f4abe
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/mainwindow.cpp

@@ -176,7 +176,7 @@ MainWindow::MainWindow() :
     m_rightNavigationWidget = new NavigationWidget(m_toggleRightSideBarAction, Side::Right);
     m_rightPaneWidget = new RightPaneWidget();
 
-    m_statusBarManager = new StatusBarManager(this);
+    m_statusBarManager = new StatusBarManager;
     m_messageManager = new MessageManager;
     m_editorManager = new EditorManager(this);
     m_externalToolManager = new ExternalToolManager();
@@ -336,7 +336,6 @@ void MainWindow::extensionsInitialized()
     MimeTypeSettings::restoreSettings();
     m_windowSupport = new WindowSupport(this, Context("Core.MainWindow"));
     m_windowSupport->setCloseActionEnabled(false);
-    m_statusBarManager->extensionsInitalized();
     OutputPaneManager::instance()->init();
     m_vcsManager->extensionsInitialized();
     m_leftNavigationWidget->setFactories(INavigationWidgetFactory::allNavigationFactories());

src/plugins/coreplugin/statusbarmanager.cpp

@@ -43,7 +43,7 @@ static const char kLeftSplitWidthKey[] = "LeftSplitWidth";
 using namespace Core;
 using namespace Core::Internal;
 
-static QWidget *createWidget(QWidget *parent = 0)
+static QWidget *createWidget(QWidget *parent)
 {
     QWidget *w = new QWidget(parent);
     w->setLayout(new QHBoxLayout);
@@ -52,11 +52,10 @@ static QWidget *createWidget(QWidget *parent = 0)
     return w;
 }
 
-StatusBarManager::StatusBarManager(MainWindow *mainWnd)
-  : QObject(mainWnd),
-    m_mainWnd(mainWnd)
+StatusBarManager::StatusBarManager()
 {
-    QStatusBar *bar = m_mainWnd->statusBar();
+    QStatusBar *bar = ICore::statusBar();
+
     m_splitter = new NonResizingSplitter(bar);
     bar->insertPermanentWidget(0, m_splitter, 10);
     m_splitter->setChildrenCollapsible(false);
@@ -104,11 +103,10 @@ void StatusBarManager::objectAdded(QObject *obj)
     if (!view)
         return;
 
-    QWidget *viewWidget = 0;
-    viewWidget = view->widget();
+    QWidget *viewWidget = view->widget();
     m_statusBarWidgets.at(view->position())->layout()->addWidget(viewWidget);
 
-    m_mainWnd->addContextObject(view);
+    ICore::addContextObject(view);
 }
 
 void StatusBarManager::aboutToRemoveObject(QObject *obj)
@@ -116,7 +114,7 @@ void StatusBarManager::aboutToRemoveObject(QObject *obj)
     StatusBarWidget *view = qobject_cast<StatusBarWidget *>(obj);
     if (!view)
         return;
-    m_mainWnd->removeContextObject(view);
+    ICore::removeContextObject(view);
 }
 
 void StatusBarManager::saveSettings()
@@ -127,10 +125,6 @@ void StatusBarManager::saveSettings()
     s->endGroup();
 }
 
-void StatusBarManager::extensionsInitalized()
-{
-}
-
 void StatusBarManager::restoreSettings()
 {
     QSettings *s = ICore::settings();

src/plugins/coreplugin/statusbarmanager.h

@@ -36,18 +36,15 @@ QT_END_NAMESPACE
 namespace Core {
 namespace Internal {
 
-class MainWindow;
-
 class StatusBarManager : public QObject
 {
     Q_OBJECT
 
 public:
-    StatusBarManager(MainWindow *mainWnd);
+    StatusBarManager();
     ~StatusBarManager();
 
     void init();
-    void extensionsInitalized();
     void restoreSettings();
 
 private:
@@ -55,7 +52,6 @@ private:
     void aboutToRemoveObject(QObject *obj);
     void saveSettings();
 
-    MainWindow *m_mainWnd;
     QSplitter *m_splitter;
     QList<QWidget *> m_statusBarWidgets;
 };