Selected items can be deleted from model via menu action "Delete item(s)"

mainwindow.h

@@ -1,6 +1,7 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
+#include <QItemSelection>
 #include <QMainWindow>
 
 class NewItemDialog;
@@ -32,14 +33,17 @@ class MainWindow : public QMainWindow {
   void closeEvent(QCloseEvent* event) override;
 
  private slots:
-  void onAboutClicked();
   void showStatusMessage(const QString text);
+  void onSelectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
+
+  void onAboutClicked();
   void on_actionCheck_for_update_triggered();
 
   void on_pushButton_clicked();
 
   /// slots for menu actions
   void openNewItemDialog();
+  void deleteSelectedtItems();
 
  private:
   Ui::MainWindow* ui;