[netinstall] Implement immutable groups

- An immutable group doesn't show a checkbox at all

src/modules/netinstall/PackageModel.cpp

@@ -119,7 +119,7 @@ PackageModel::data( const QModelIndex& index, int role ) const
     switch ( role )
     {
     case Qt::CheckStateRole:
-        return index.column() == NameColumn ? item->isSelected() : QVariant();
+        return index.column() == NameColumn ? ( item->isImmutable() ? QVariant() : item->isSelected() ) : QVariant();
     case Qt::DisplayRole:
         return item->isHidden() ? QVariant() : item->data( index.column() );
     case MetaExpandRole:
@@ -158,6 +158,11 @@ PackageModel::flags( const QModelIndex& index ) const
     }
     if ( index.column() == NameColumn )
     {
+        PackageTreeItem* item = static_cast< PackageTreeItem* >( index.internalPointer() );
+        if ( item->isImmutable() )
+        {
+            return QAbstractItemModel::flags( index );  //Qt::NoItemFlags;
+        }
         return Qt::ItemIsUserCheckable | QAbstractItemModel::flags( index );
     }
     return QAbstractItemModel::flags( index );

src/modules/netinstall/PackageTreeItem.cpp

@@ -41,6 +41,7 @@ PackageTreeItem::PackageTreeItem( const QString& packageName, PackageTreeItem* p
     , m_packageName( packageName )
     , m_selected( parentCheckState( parent ) )
     , m_isGroup( false )
+    , m_showReadOnly( parent ? parent->isImmutable() : false )
 {
 }
 

src/modules/netinstall/PackageTreeItem.h

@@ -97,6 +97,13 @@ public:
      */
     bool expandOnStart() const { return m_startExpanded; }
 
+    /** @brief Is this an immutable item?
+     *
+     * Groups can be immutable: then you can't toggle the selected
+     * state of any of its items.
+     */
+    bool isImmutable() const { return m_showReadOnly; }
+
     /** @brief is this item selected?
      *
      * Groups may be partially selected; packages are only on or off.