delete shortcut

helloqube/helloqube.pro.user

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 3.5.1, 2015-11-21T20:51:27. -->
+<!-- Written by QtCreator 3.5.1, 2015-11-21T21:01:34. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>

helloqube/mainwindow.cpp

@@ -240,6 +240,8 @@ MainWindow::MainWindow(QWidget *parent)
     connect(addCone, SIGNAL(triggered(bool)),controller, SLOT(addCone()));
     connect(addTorus, SIGNAL(triggered(bool)),controller, SLOT(addTorus()));
     connect(deletePrimitive, SIGNAL(triggered(bool)),controller, SLOT(deletePrimitive()));
+
+    deletePrimitive->setShortcut(QKeySequence(Qt::Key_Delete));
 }