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

Dialogs/newitemdialog.cpp

@@ -1,6 +1,8 @@
 #include "newitemdialog.h"
 
 #include <QGridLayout>
+#include <QJsonArray>
+#include <QJsonObject>
 #include <QLabel>
 #include <QLineEdit>
 #include <QSpinBox>
@@ -58,3 +60,21 @@ void NewItemDialog::createContent() {
 
   m_outerLayout->insertWidget(0, m_contentContainer);
 }
+
+void NewItemDialog::accept() {
+  QJsonObject itemObject;
+  itemObject.insert("Name", m_nameEdit->text());
+  itemObject.insert("Description", m_descriptionEdit->text());
+  itemObject.insert("Info", m_infoEdit->text());
+  itemObject.insert("Amount", m_amountBox->value());
+  itemObject.insert("Factor", m_factorBox->value());
+
+  QJsonDocument jsonDoc;
+  QJsonArray itemArray;
+  itemArray.append(itemObject);
+  jsonDoc.setArray(itemArray);
+  emit addItems(jsonDoc.toJson(QJsonDocument::Compact));
+
+  // resetContent();
+  AbstractDialog::accept();
+}

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;

mainwindow.cpp

@@ -8,6 +8,7 @@
 #include "Dialogs/newitemdialog.h"
 #include "data/settingshandler.h"
 #include "genericcore.h"
+#include "model/tablemodel.h"
 
 static QString updateTextClean = "Do you want to update the application now?";
 static QString updateTextDirty = "Do you want to save the tasks & update the application now?";
@@ -35,6 +36,9 @@ MainWindow::MainWindow(QWidget* parent)
   restoreGeometry(settings.value("geometry").toByteArray());
   restoreState(settings.value("windowState").toByteArray());
 
+  m_tableModel = m_core->getModel();
+  ui->tableView->setModel(m_tableModel.get());
+
   createActions();
   createHelpMenu();
   createGuiDialogs();
@@ -44,9 +48,6 @@ MainWindow::MainWindow(QWidget* parent)
   connect(this, &MainWindow::displayStatusMessage, this, &MainWindow::showStatusMessage);
   connect(this, &MainWindow::checkForUpdates, this,
           &MainWindow::on_actionCheck_for_update_triggered, Qt::QueuedConnection);
-
-  m_tableModel = m_core->getModel();
-  ui->tableView->setModel(m_tableModel.get());
 }
 
 MainWindow::~MainWindow() { delete ui; }
@@ -129,8 +130,6 @@ void MainWindow::on_pushButton_clicked() {
 
 void MainWindow::openNewItemDialog() {
   showStatusMessage(tr("Invoked 'Edit|New Item'"));
-  qInfo() << "'open new item dialog' action triggered...";
-
   m_newItemDialog->show();
 }
 
@@ -268,4 +267,6 @@ void MainWindow::createHelpMenu() {
 void MainWindow::createGuiDialogs() {
   m_newItemDialog = make_unique<NewItemDialog>(this);
   m_newItemDialog->createContent();
+  connect(m_newItemDialog.get(), &NewItemDialog::addItems, m_tableModel.get(),
+          &TableModel::appendItems);
 }

mainwindow.h

@@ -4,7 +4,7 @@
 #include <QMainWindow>
 
 class NewItemDialog;
-class QAbstractItemModel;
+class TableModel;
 
 QT_BEGIN_NAMESPACE
 
@@ -46,7 +46,7 @@ class MainWindow : public QMainWindow {
 
   // GenericCore* m_core;
   unique_ptr<GenericCore> m_core;
-  shared_ptr<QAbstractItemModel> m_tableModel;
+  shared_ptr<TableModel> m_tableModel;
 
   /// File actions
   unique_ptr<QAction> m_newFileAct;