last node cannot be deleted

14 years ago · a3f87785f5
parent b947ebf2ad
commit a3f87785f5
1 changed files with 8 additions and 0 deletions
--- a/graphwidget.cpp
+++ b/graphwidget.cpp
@ -331,6 +331,14 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)

         if (m_activeNode)
         {
+             if (m_nodeList.size()==1)
+             {
+                 dynamic_cast<MainWindow *>(m_parent)->getStatusBar()->showMessage(
+                             tr("Last node cannot be deleted."),
+                             5000); // millisec
+                  break;
+             }
+
             if (m_hintNode==m_activeNode)
                 m_hintNode=0;