[libcalamaresui] Provide convenience method for context properties

src/libcalamaresui/viewpages/QmlViewStep.cpp

@@ -232,7 +232,7 @@ QmlViewStep::setConfigurationMap( const QVariantMap& configurationMap )
         QObject* config = this->getConfig();
         if ( config )
         {
-            m_qmlWidget->engine()->rootContext()->setContextProperty( "config", config );
+            setContextProperty( "config", config );
         }
 
         cDebug() << "QmlViewStep" << moduleInstanceKey() << "loading" << m_qmlFileName;
@@ -267,4 +267,10 @@ QmlViewStep::getConfig()
     return nullptr;
 }
 
+void
+QmlViewStep::setContextProperty( const char* name, QObject* property )
+{
+    m_qmlWidget->engine()->rootContext()->setContextProperty( name, property );
+}
+
 }  // namespace Calamares

src/libcalamaresui/viewpages/QmlViewStep.h

@@ -85,6 +85,12 @@ protected:
      */
     virtual QObject* getConfig();
 
+    /** @brief Adds a context property for this QML file
+     *
+     * Does not take ownership.
+     */
+    void setContextProperty( const char* name, QObject* property );
+
 private Q_SLOTS:
     void loadComplete();