Don't show Design mode if "designer" plugins are disabled/not present.

Change-Id: Iee0a01491075e1e82c17211b5e119bd5e167763b
Reviewed-by: Marco Bubke <marco.bubke@nokia.com>

src/plugins/coreplugin/coreplugin.cpp

@@ -60,7 +60,8 @@ CorePlugin::~CorePlugin()
     }
 
     if (m_designMode) {
-        removeObject(m_designMode);
+        if (m_designMode->designModeIsRequired())
+            removeObject(m_designMode);
         delete m_designMode;
     }
 
@@ -90,7 +91,6 @@ bool CorePlugin::initialize(const QStringList &arguments, QString *errorMessage)
         addObject(m_editMode);
         m_mainWindow->modeManager()->activateMode(m_editMode->id());
         m_designMode = new DesignMode;
-        addObject(m_designMode);
     }
     return success;
 }
@@ -98,6 +98,8 @@ bool CorePlugin::initialize(const QStringList &arguments, QString *errorMessage)
 void CorePlugin::extensionsInitialized()
 {
     m_mainWindow->mimeDatabase()->syncUserModifiedMimeTypes();
+    if (m_designMode->designModeIsRequired())
+        addObject(m_designMode);
     m_mainWindow->extensionsInitialized();
 }
 

src/plugins/coreplugin/designmode.cpp

@@ -54,6 +54,8 @@
 #include <QtGui/QPlainTextEdit>
 #include <QtGui/QStackedWidget>
 
+static Core::DesignMode *m_instance = 0;
+
 namespace Core {
 
 class EditorManager;
@@ -103,6 +105,7 @@ public:
     Internal::DesignModeCoreListener *m_coreListener;
     QWeakPointer<Core::IEditor> m_currentEditor;
     bool m_isActive;
+    bool m_isRequired;
     QList<DesignEditorInfo*> m_editors;
     QStackedWidget *m_stackWidget;
     Context m_activeContext;
@@ -111,6 +114,7 @@ public:
 DesignModePrivate::DesignModePrivate(DesignMode *q)
   : m_coreListener(new Internal::DesignModeCoreListener(q)),
     m_isActive(false),
+    m_isRequired(false),
     m_stackWidget(new QStackedWidget)
 {
 }
@@ -118,6 +122,7 @@ DesignModePrivate::DesignModePrivate(DesignMode *q)
 DesignMode::DesignMode()
     : d(new DesignModePrivate(this))
 {
+    m_instance = this;
     setObjectName(QLatin1String("DesignMode"));
     setEnabled(false);
     setContext(Context(Constants::C_DESIGN_MODE));
@@ -146,6 +151,21 @@ DesignMode::~DesignMode()
     delete d;
 }
 
+DesignMode *DesignMode::instance()
+{
+    return m_instance;
+}
+
+void DesignMode::setDesignModeIsRequired()
+{
+    d->m_isRequired = true;
+}
+
+bool DesignMode::designModeIsRequired() const
+{
+    return d->m_isRequired;
+}
+
 QStringList DesignMode::registeredMimeTypes() const
 {
     QStringList rc;
@@ -163,6 +183,7 @@ void DesignMode::registerDesignWidget(QWidget *widget,
                                       const QStringList &mimeTypes,
                                       const Context &context)
 {
+    setDesignModeIsRequired();
     int index = d->m_stackWidget->addWidget(widget);
 
     DesignEditorInfo *info = new DesignEditorInfo;

src/plugins/coreplugin/designmode.h

@@ -59,6 +59,11 @@ public:
     explicit DesignMode();
     virtual ~DesignMode();
 
+    static DesignMode *instance();
+
+    void setDesignModeIsRequired();
+    bool designModeIsRequired() const;
+
     void registerDesignWidget(QWidget *widget,
                               const QStringList &mimeTypes,
                               const Context &context);

src/plugins/designer/formeditorplugin.cpp

@@ -47,6 +47,7 @@
 #include <coreplugin/icore.h>
 #include <coreplugin/mimedatabase.h>
 #include <coreplugin/coreconstants.h>
+#include <coreplugin/designmode.h>
 #include <coreplugin/id.h>
 #include <extensionsystem/pluginmanager.h>
 
@@ -108,6 +109,7 @@ bool FormEditorPlugin::initialize(const QStringList &arguments, QString *error)
 
 void FormEditorPlugin::extensionsInitialized()
 {
+    Core::DesignMode::instance()->setDesignModeIsRequired();
     // 4) test and make sure everything works (undo, saving, editors, opening/closing multiple files, dirtiness etc)
 }
 

src/plugins/designer/formeditorw.cpp

@@ -342,7 +342,7 @@ void FormEditorW::fullInit()
     m_toolBar->setNavigationVisible(false);
     m_toolBar->addCenterToolBar(m_editorToolBar);
 
-    m_designMode = ExtensionSystem::PluginManager::instance()->getObject<Core::DesignMode>();
+    m_designMode = Core::DesignMode::instance();
     m_modeWidget = new QWidget;
     m_modeWidget->setObjectName(QLatin1String("DesignerModeWidget"));
     QVBoxLayout *layout = new QVBoxLayout;

src/plugins/qmldesigner/designmodewidget.cpp

@@ -44,6 +44,7 @@
 #include <toolbox.h>
 
 #include <coreplugin/coreconstants.h>
+#include <coreplugin/designmode.h>
 #include <coreplugin/modemanager.h>
 #include <coreplugin/outputpane.h>
 #include <coreplugin/icore.h>
@@ -224,10 +225,8 @@ DesignModeWidget::DesignModeWidget(QWidget *parent) :
     m_toggleRightSidebarAction = new QAction(tr("Toggle &Right Sidebar"), this);
     connect(m_toggleRightSidebarAction, SIGNAL(triggered()), SLOT(toggleRightSidebar()));
 
-    Core::ModeManager *modeManager = Core::ModeManager::instance();
-    Core::IMode *designmode = modeManager->mode(Core::Constants::MODE_DESIGN);
     m_outputPlaceholderSplitter = new Core::MiniSplitter;
-    m_outputPanePlaceholder = new StyledOutputpanePlaceHolder(designmode, m_outputPlaceholderSplitter);
+    m_outputPanePlaceholder = new StyledOutputpanePlaceHolder(Core::DesignMode::instance(), m_outputPlaceholderSplitter);
 }
 
 DesignModeWidget::~DesignModeWidget()

src/plugins/qmldesigner/qmldesignerplugin.cpp

@@ -359,7 +359,7 @@ void BauhausPlugin::updateActions(Core::IEditor* editor)
 
 void BauhausPlugin::extensionsInitialized()
 {
-    m_designMode = ExtensionSystem::PluginManager::instance()->getObject<Core::DesignMode>();
+    m_designMode = Core::DesignMode::instance();
 
     m_mimeTypes << "application/x-qml";