[keyboard] Tell the keyboard preview to update on config changes

These calls to setLayout() and setVariant() got lost in
the transition to Config object, in 5afe5413.

Reported by Harald Sitter.

src/modules/keyboard/KeyboardLayoutModel.cpp

@@ -198,6 +198,16 @@ KeyboardLayoutModel::item( const int& index ) const
     return m_layouts.at( index );
 }
 
+QString
+KeyboardLayoutModel::key( int index ) const
+{
+    if ( index >= m_layouts.count() || index < 0 )
+    {
+        return QString();
+    }
+    return m_layouts.at( index ).first;
+}
+
 void
 KeyboardLayoutModel::init()
 {

src/modules/keyboard/KeyboardLayoutModel.h

@@ -118,6 +118,13 @@ public:
     int currentIndex() const;
     const QPair< QString, KeyboardGlobal::KeyboardInfo > item( const int& index ) const;
 
+    /** @brief xkb key for a given index (row)
+     *
+     * This is like calling data( QModelIndex( index ), KeyboardLayoutKeyRole ).toString(),
+     * but shorter and faster. Can return an empty string if index is invalid.
+     */
+    QString key( int index ) const;
+
 protected:
     QHash< int, QByteArray > roleNames() const override;
 

src/modules/keyboard/KeyboardPage.cpp

@@ -70,8 +70,9 @@ KeyboardPage::KeyboardPage( Config* config, QWidget* parent )
         cDebug() << "Variants now" << model->rowCount() << model->currentIndex();
     }
 
-    connect(
-        ui->buttonRestore, &QPushButton::clicked, [config = config] { config->keyboardModels()->setCurrentIndex(); } );
+    connect( ui->buttonRestore, &QPushButton::clicked, [ config = config ] {
+        config->keyboardModels()->setCurrentIndex();
+    } );
 
     connect( ui->physicalModelSelector,
              QOverload< int >::of( &QComboBox::currentIndexChanged ),
@@ -82,18 +83,22 @@ KeyboardPage::KeyboardPage( Config* config, QWidget* parent )
              ui->physicalModelSelector,
              &QComboBox::setCurrentIndex );
 
-    connect( ui->layoutSelector->selectionModel(),
-             &QItemSelectionModel::currentChanged,
-             [this]( const QModelIndex& current ) { m_config->keyboardLayouts()->setCurrentIndex( current.row() ); } );
-    connect( config->keyboardLayouts(), &KeyboardLayoutModel::currentIndexChanged, [this]( int index ) {
+    connect(
+        ui->layoutSelector->selectionModel(),
+        &QItemSelectionModel::currentChanged,
+        [ this ]( const QModelIndex& current ) { m_config->keyboardLayouts()->setCurrentIndex( current.row() ); } );
+    connect( config->keyboardLayouts(), &KeyboardLayoutModel::currentIndexChanged, [ this ]( int index ) {
         ui->layoutSelector->setCurrentIndex( m_config->keyboardLayouts()->index( index ) );
+        m_keyboardPreview->setLayout( m_config->keyboardLayouts()->key( index ) );
     } );
 
-    connect( ui->variantSelector->selectionModel(),
-             &QItemSelectionModel::currentChanged,
-             [this]( const QModelIndex& current ) { m_config->keyboardVariants()->setCurrentIndex( current.row() ); } );
-    connect( config->keyboardVariants(), &KeyboardVariantsModel::currentIndexChanged, [this]( int index ) {
+    connect(
+        ui->variantSelector->selectionModel(),
+        &QItemSelectionModel::currentChanged,
+        [ this ]( const QModelIndex& current ) { m_config->keyboardVariants()->setCurrentIndex( current.row() ); } );
+    connect( config->keyboardVariants(), &KeyboardVariantsModel::currentIndexChanged, [ this ]( int index ) {
         ui->variantSelector->setCurrentIndex( m_config->keyboardVariants()->index( index ) );
+        m_keyboardPreview->setVariant( m_config->keyboardVariants()->key( index ) );
     } );
     CALAMARES_RETRANSLATE_SLOT( &KeyboardPage::retranslate )
 }