[libcalamaresui] Move registration into Qml-service

- Registration of QML modules may need to be done
  for more parts of Calamares. Move into the library,
  out of the model.
- Register for QML when using the QML sidebar.

src/calamares/CalamaresWindow.cpp

@@ -28,6 +28,7 @@
 #include "progresstree/ProgressTreeView.h"
 #include "utils/CalamaresUtilsGui.h"
 #include "utils/Logger.h"
+#include "utils/Qml.h"
 #include "utils/Retranslator.h"
 
 #include <QApplication>
@@ -133,6 +134,7 @@ CalamaresWindow::getWidgetSidebar( int desiredWidth )
 QWidget*
 CalamaresWindow::getQmlSidebar( int desiredWidth )
 {
+    CalamaresUtils::registerCalamaresModels();
     QQuickWidget* w = new QQuickWidget( this );
     w->setSource( QUrl( ":/sidebar.qml" ) );
     return w;

src/libcalamaresui/utils/Qml.cpp

@@ -19,6 +19,7 @@
 #include "Qml.h"
 
 #include "Branding.h"
+#include "ViewManager.h"
 #include "utils/Logger.h"
 
 #include <QByteArray>
@@ -113,5 +114,25 @@ qmlSearchNames()
     return names;
 }
 
+void
+registerCalamaresModels()
+{
+    static bool done = false;
+    if ( !done )
+    {
+        done = true;
+        // Because branding and viewmanager have a parent (CalamaresApplication
+        // and CalamaresWindow), they will not be deleted by QmlEngine.
+        //   https://doc.qt.io/qt-5/qtqml-cppintegration-data.html#data-ownership
+        qmlRegisterSingletonType< Calamares::Branding >(
+            "io.calamares.ui", 1, 0, "Branding", []( QQmlEngine*, QJSEngine* ) -> QObject* {
+                return Calamares::Branding::instance();
+            } );
+        qmlRegisterSingletonType< Calamares::Branding >(
+            "io.calamares.core", 1, 0, "ViewManager", []( QQmlEngine*, QJSEngine* ) -> QObject* {
+                return Calamares::ViewManager::instance();
+            } );
+    }
+}
 
 }  // namespace CalamaresUtils

src/libcalamaresui/utils/Qml.h

@@ -28,6 +28,12 @@ class QQuickItem;
 
 namespace CalamaresUtils
 {
+/** @brief Sets up global Calamares models for QML
+ *
+ * This needs to be called at least once to make the global Calamares
+ * models (Branding, ViewManager, ...) available to QML.
+ */
+UIDLLEXPORT void registerCalamaresModels();
 
 /** @brief Calls the QML method @p method on @p qmlObject
  *
@@ -53,17 +59,17 @@ enum class QmlSearch
     Both
 };
 
+///@brief Names for the search terms (in config files)
+UIDLLEXPORT const NamedEnumTable< QmlSearch >& qmlSearchNames();
+
 /** @brief Find a suitable QML file, given the search method and name hints
  *
  * Returns QString() if nothing is found (which would mean the module
  * is badly configured).
  */
-QString searchQmlFile( QmlSearch method,
-                       const QString& configuredName,
-                       const Calamares::ModuleSystem::InstanceKey& i = Calamares::ModuleSystem::InstanceKey() );
-
-///@brief Names for the search terms (in config files)
-const NamedEnumTable< QmlSearch >& qmlSearchNames();
+UIDLLEXPORT QString searchQmlFile( QmlSearch method,
+                                   const QString& configuredName,
+                                   const Calamares::ModuleSystem::InstanceKey& i );
 
 }  // namespace CalamaresUtils
 

src/libcalamaresui/viewpages/QmlViewStep.cpp

@@ -67,27 +67,6 @@ changeQMLState( QMLAction action, QQuickItem* item )
     }
 }
 
-static void
-registerCalamaresModels()
-{
-    static bool done = false;
-    if ( !done )
-    {
-        done = true;
-        // Because branding and viewmanager have a parent (CalamaresApplication
-        // and CalamaresWindow), they will not be deleted by QmlEngine.
-        //   https://doc.qt.io/qt-5/qtqml-cppintegration-data.html#data-ownership
-        qmlRegisterSingletonType< Calamares::Branding >(
-            "io.calamares.ui", 1, 0, "Branding", []( QQmlEngine*, QJSEngine* ) -> QObject* {
-                return Calamares::Branding::instance();
-            } );
-        qmlRegisterSingletonType< Calamares::Branding >(
-            "io.calamares.core", 1, 0, "ViewManager", []( QQmlEngine*, QJSEngine* ) -> QObject* {
-                return Calamares::ViewManager::instance();
-            } );
-    }
-}
-
 namespace Calamares
 {
 
@@ -97,7 +76,7 @@ QmlViewStep::QmlViewStep( QObject* parent )
     , m_spinner( new WaitingWidget( tr( "Loading ..." ) ) )
     , m_qmlWidget( new QQuickWidget )
 {
-    registerCalamaresModels();
+    CalamaresUtils::registerCalamaresModels();
 
     QVBoxLayout* layout = new QVBoxLayout( m_widget );
     layout->addWidget( m_spinner );