[welcome] Introduce a delegate for drawing the languages list

- Show the native name left, English name right

src/modules/welcome/CMakeLists.txt

@@ -16,9 +16,9 @@ include_directories( ${PROJECT_BINARY_DIR}/src/libcalamaresui )
 
 set( CHECKER_SOURCES
     checker/CheckerContainer.cpp
+    checker/GeneralRequirements.cpp
     checker/ResultWidget.cpp
     checker/ResultsListWidget.cpp
-    checker/GeneralRequirements.cpp
     ${PARTMAN_SRC}
 )
 

src/modules/welcome/LocaleModel.cpp

@@ -41,18 +41,18 @@ LocaleModel::rowCount( const QModelIndex& ) const
 QVariant
 LocaleModel::data( const QModelIndex& index, int role ) const
 {
-    if ( role != Qt::DisplayRole )
+    if ( ( role != LabelRole ) && ( role != EnglishLabelRole ) )
         return QVariant();
 
     if ( !index.isValid() )
         return QVariant();
 
     const auto& locale = m_locales.at( index.row() );
-    switch ( index.column() )
+    switch ( role )
     {
-    case 0:
+    case LabelRole:
         return locale.label();
-    case 1:
+    case EnglishLabelRole:
         return locale.englishLabel();
     default:
         return QVariant();
@@ -100,3 +100,10 @@ LocaleModel::find( const QLocale& locale ) const
         return locale == l.locale();
     } );
 }
+
+void
+LocaleTwoColumnDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    QStyledItemDelegate::paint( painter, option, index );
+    option.widget->style()->drawItemText( painter, option.rect, Qt::AlignRight | Qt::AlignVCenter, option.palette, false, index.data( LocaleModel::EnglishLabelRole ).toString() );
+}

src/modules/welcome/LocaleModel.h

@@ -20,9 +20,9 @@
 #define WELCOME_LOCALEMODEL_H
 
 #include <QAbstractListModel>
+#include <QStyledItemDelegate>
 #include <QVector>
 
-
 #include "utils/LocaleLabel.h"
 
 class LocaleModel : public QAbstractListModel
@@ -30,6 +30,12 @@ class LocaleModel : public QAbstractListModel
 public:
     using LocaleLabel = CalamaresUtils::LocaleLabel;
 
+    enum
+    {
+        LabelRole = Qt::DisplayRole,
+        EnglishLabelRole = Qt::UserRole + 1
+    };
+
     LocaleModel( const QStringList& locales, QObject* parent = nullptr );
     virtual ~LocaleModel() override;
 
@@ -56,4 +62,12 @@ private:
     QVector< LocaleLabel > m_locales;
 } ;
 
+class LocaleTwoColumnDelegate : public QStyledItemDelegate
+{
+public:
+    using QStyledItemDelegate::QStyledItemDelegate;
+
+    void paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const override;
+} ;
+
 #endif

src/modules/welcome/WelcomePage.cpp

@@ -36,10 +36,10 @@
 
 #include <QApplication>
 #include <QBoxLayout>
+#include <QComboBox>
 #include <QDesktopServices>
 #include <QFocusEvent>
 #include <QLabel>
-#include <QComboBox>
 #include <QMessageBox>
 
 WelcomePage::WelcomePage( QWidget* parent )
@@ -133,6 +133,7 @@ WelcomePage::initLanguages()
 
     m_languages = new LocaleModel( QString( CALAMARES_TRANSLATION_LANGUAGES ).split( ';') );
     ui->languageWidget->setModel( m_languages );
+    ui->languageWidget->setItemDelegate( new LocaleTwoColumnDelegate( ui->languageWidget ) );
 
     // Find the best initial translation
     QLocale defaultLocale = QLocale( QLocale::system().name() );