don't activate the TOC when it has no items

svn path=/trunk/KDE/kdegraphics/okular/; revision=753072

ui/toc.cpp

@@ -79,7 +79,7 @@ void TOC::notifySetup( const QVector< Okular::Page * > & /*pages*/, int setupFla
 
     // else populate the listview and enable the tab
     m_model->fill( syn );
-    emit hasTOC( true );
+    emit hasTOC( !m_model->isEmpty() );
 }
 
 void TOC::notifyViewportChanged( bool /*smoothMove*/ )

ui/tocmodel.cpp

@@ -313,6 +313,11 @@ void TOCModel::setCurrentViewport( const Okular::DocumentViewport &viewport )
     }
 }
 
+bool TOCModel::isEmpty() const
+{
+    return d->root->children.isEmpty();
+}
+
 QString TOCModel::externalFileNameForIndex( const QModelIndex &index ) const
 {
     if ( !index.isValid() )

ui/tocmodel.h

@@ -41,6 +41,8 @@ class TOCModel : public QAbstractItemModel
         void clear();
         void setCurrentViewport( const Okular::DocumentViewport &viewport );
 
+        bool isEmpty() const;
+
         QString externalFileNameForIndex( const QModelIndex &index ) const;
         Okular::DocumentViewport viewportForIndex( const QModelIndex &index ) const;