quit action checks contentchange

mainwindow.cpp

@@ -25,9 +25,8 @@ MainWindow::MainWindow(QWidget *parent) :
             this, SLOT(closeFile()));
     connect(m_ui->actionExport, SIGNAL(activated()),
             this, SLOT(exportScene()));
-
     connect(m_ui->actionQuit, SIGNAL(activated()),
-            QApplication::instance(), SLOT(quit()));
+            this, SLOT(quit()));
 
     connect(m_ui->actionAbout_QtMindMap, SIGNAL(activated()),
             this, SLOT(about()));
@@ -209,6 +208,14 @@ void MainWindow::exportScene()
      }
 }
 
+void MainWindow::quit()
+{
+    if (m_contentChanged && !closeFile())
+        return;
+
+    QApplication::instance()->quit();
+}
+
 void MainWindow::keys()
 {
     QMessageBox msgBox(this);

mainwindow.h

@@ -30,6 +30,7 @@ public slots:
     bool saveFileAs();
     bool closeFile();
     void exportScene();
+    void quit();
 
     void keys();
     void about();