An item can be added to the model with accepting the NewItemDialog.

Dialogs/newitemdialog.h

@@ -3,15 +3,25 @@
 
 #include "abstractdialog.h"
 
+class QDoubleSpinBox;
 class QLineEdit;
 class QSpinBox;
 class QLabel;
 class NewItemDialog : public AbstractDialog {
+  Q_OBJECT
+
  public:
   NewItemDialog(QWidget* parent = nullptr);
 
   void createContent() override;
 
+ signals:
+  void addItems(const QByteArray& jsonDoc);
+
+ public slots:
+  void accept() override;
+  // void reject() override;
+
  private:
   QLabel* m_nameLabel   = nullptr;
   QLineEdit* m_nameEdit = nullptr;