[libcalamares] Add convenience accessor for translations

 - Which translations are available is a global property
   of Calamares itself, not of the plugins, so getting
   the model of available translations should live there.
   Move the relevant code (which is simple) from the
   Welcome module.

3 files changed, 22 insertions, 2 deletions

diff --git a/src/libcalamares/locale/LabelModel.cpp b/src/libcalamares/locale/LabelModel.cpp
index 90475cb0e..ac931620d 100644
--- a/src/libcalamares/locale/LabelModel.cpp
+++ b/src/libcalamares/locale/LabelModel.cpp
@@ -18,6 +18,8 @@
 
 #include "LabelModel.h"
 
+#include "CalamaresVersion.h"  // For the list of translations
+
 namespace CalamaresUtils::Locale
 {
 
@@ -104,4 +106,10 @@ LabelModel::find( const QLocale& locale ) const
     } );
 }
 
+LabelModel* const availableTranslations()
+{
+    static LabelModel model( QString( CALAMARES_TRANSLATION_LANGUAGES ).split( ';') );
+    return &model;
+}
+
 }  // namespace
diff --git a/src/libcalamares/locale/LabelModel.h b/src/libcalamares/locale/LabelModel.h
index c807e6016..6b4f41343 100644
--- a/src/libcalamares/locale/LabelModel.h
+++ b/src/libcalamares/locale/LabelModel.h
@@ -30,7 +30,7 @@ namespace CalamaresUtils {}
 namespace CalamaresUtils::Locale
 {
 
-DLLEXPORT class LabelModel : public QAbstractListModel
+class DLLEXPORT LabelModel : public QAbstractListModel
 {
 public:
     enum
@@ -65,5 +65,17 @@ private:
     QVector< Label > m_locales;
 } ;
 
+/** @brief Returns a model with all available translations.
+ *
+ * The translations are set when Calamares is compiled; the list
+ * is provided by CMake via the CALAMARES_TRANSLATION_LANGUAGES
+ * #define.
+ *
+ * This model is a singleton and can be shared.
+ *
+ * NOTE: While the model is not typed const, it should be. Do not modify.
+ */
+DLLEXPORT LabelModel* const availableTranslations();
+
 }  // namespace
 #endif
diff --git a/src/modules/welcome/WelcomePage.cpp b/src/modules/welcome/WelcomePage.cpp
index 11a17c2f0..c7d169c92 100644
--- a/src/modules/welcome/WelcomePage.cpp
+++ b/src/modules/welcome/WelcomePage.cpp
@@ -131,7 +131,7 @@ WelcomePage::initLanguages()
     ui->languageWidget->clear();
     ui->languageWidget->setInsertPolicy( QComboBox::InsertAtBottom );
 
-    m_languages = new CalamaresUtils::Locale::LabelModel( QString( CALAMARES_TRANSLATION_LANGUAGES ).split( ';') );
+    m_languages = CalamaresUtils::Locale::availableTranslations();
     ui->languageWidget->setModel( m_languages );
     ui->languageWidget->setItemDelegate( new LocaleTwoColumnDelegate( ui->languageWidget ) );