Added an AbstractDialog class and using it as base for a NewItemDialog class (no new item functionality yet).

CMakeLists.txt

@@ -29,6 +29,8 @@ if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
         ${PROJECT_SOURCES}
         utils/messagehandler.h
         assets/icons.qrc
+        Dialogs/abstractdialog.h Dialogs/abstractdialog.cpp
+        Dialogs/newitemdialog.h Dialogs/newitemdialog.cpp
     )
 # Define target properties for Android with Qt 6 as:
 #    set_property(TARGET ${TARGET_APP} APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR

Dialogs/abstractdialog.cpp

@@ -0,0 +1,51 @@
+#include "abstractdialog.h"
+
+#include <QDialogButtonBox>
+#include <QGuiApplication>
+#include <QLabel>
+#include <QScreen>
+#include <QVBoxLayout>
+
+AbstractDialog::AbstractDialog(QWidget* parent)
+    : QDialog(parent) {
+  setWindowTitle(tr("Dialog does what?..."));
+  setModal(true);
+
+  m_buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
+  connect(m_buttonBox, &QDialogButtonBox::accepted, this, &AbstractDialog::accept);
+  connect(m_buttonBox, &QDialogButtonBox::rejected, this, &AbstractDialog::reject);
+
+  m_contentContainer = new QLabel("content", this);
+
+  m_outerLayout = new QVBoxLayout;
+  m_outerLayout->addWidget(m_contentContainer);
+  m_outerLayout->addWidget(m_buttonBox);
+
+  setLayout(m_outerLayout);
+}
+
+void AbstractDialog::show() {
+  centerInParent();
+  QWidget::show();
+}
+
+void AbstractDialog::accept() { QDialog::accept(); }
+
+void AbstractDialog::reject() { QDialog::reject(); }
+
+void AbstractDialog::centerInParent() {
+  // BUG the centering in the parent doesn't work the first time (and the later ones seem off too)
+  QWidget* parent = parentWidget();
+
+  if (parent) {
+    auto parentRect = parent->geometry();
+    move(parentRect.center() - rect().center());
+  } else {
+    QRect screenGeometry = QGuiApplication::screens().at(0)->geometry();
+    int x                = (screenGeometry.width() - width()) / 2;
+    int y                = (screenGeometry.height() - height()) / 2;
+    move(x, y);
+  }
+}
+
+void AbstractDialog::closeEvent(QCloseEvent* event) { QWidget::closeEvent(event); }

Dialogs/abstractdialog.h

@@ -0,0 +1,33 @@
+#ifndef ABSTRACTDIALOG_H
+#define ABSTRACTDIALOG_H
+
+#include <QDialog>
+
+class QGridLayout;
+class QDialogButtonBox;
+class QVBoxLayout;
+
+class AbstractDialog : public QDialog {
+  Q_OBJECT
+ public:
+  AbstractDialog(QWidget* parent = nullptr);
+  virtual void createContent() = 0;
+
+  /// QDialog interface
+ public slots:
+  void show();
+  void accept() override;
+  void reject() override;
+
+ protected:
+  void centerInParent();
+
+ protected:
+  QWidget* m_contentContainer;
+  QVBoxLayout* m_outerLayout;
+  QDialogButtonBox* m_buttonBox = nullptr;
+
+  void closeEvent(QCloseEvent* event) override;
+};
+
+#endif  // ABSTRACTDIALOG_H

Dialogs/newitemdialog.cpp

@@ -0,0 +1,60 @@
+#include "newitemdialog.h"
+
+#include <QGridLayout>
+#include <QLabel>
+#include <QLineEdit>
+#include <QSpinBox>
+
+#include <model/tablemodel.h>
+
+NewItemDialog::NewItemDialog(QWidget* parent)
+    : AbstractDialog(parent) {}
+
+void NewItemDialog::createContent() {
+  if (m_contentContainer) {
+    delete m_contentContainer;
+  }
+
+  setWindowTitle(tr("New item..."));
+
+  m_contentContainer = new QWidget(this);
+
+  // REFACTOR deduce label names and types from meta data & use a factory
+  m_nameLabel = new QLabel("&Name");
+  m_nameEdit  = new QLineEdit();
+  m_nameLabel->setBuddy(m_nameEdit);
+
+  m_descriptionLabel = new QLabel("&Description");
+  m_descriptionEdit  = new QLineEdit();
+  m_descriptionLabel->setBuddy(m_descriptionEdit);
+
+  m_infoLabel = new QLabel("&Info");
+  m_infoEdit  = new QLineEdit();
+  m_infoLabel->setBuddy(m_infoEdit);
+
+  m_amountLabel = new QLabel("&Amount");
+  m_amountBox   = new QSpinBox();
+  m_amountBox->setMaximum(1000);
+  m_amountLabel->setBuddy(m_amountBox);
+
+  m_factorLabel = new QLabel("&Factor");
+  m_factorBox   = new QSpinBox();
+  m_factorBox->setMaximum(1000);
+  m_factorLabel->setBuddy(m_factorBox);
+
+  QGridLayout* layout = new QGridLayout();
+  layout->addWidget(m_nameLabel, 0, 0, 1, 1);
+  layout->addWidget(m_nameEdit, 0, 1, 1, 1);
+  layout->addWidget(m_descriptionLabel, 1, 0, 1, 1);
+  layout->addWidget(m_descriptionEdit, 1, 1, 1, 1);
+  layout->addWidget(m_infoLabel, 2, 0, 1, 1);
+  layout->addWidget(m_infoEdit, 2, 1, 1, 1);
+  layout->addWidget(m_amountLabel, 3, 0, 1, 1);
+  layout->addWidget(m_amountBox, 3, 1, 1, 1);
+  layout->addWidget(m_factorLabel, 4, 0, 1, 1);
+  layout->addWidget(m_factorBox, 4, 1, 1, 1);
+
+  m_contentContainer->setLayout(layout);
+
+  m_outerLayout->insertWidget(0, m_contentContainer);
+}

Dialogs/newitemdialog.h

@@ -0,0 +1,32 @@
+#ifndef NEWITEMDIALOG_H
+#define NEWITEMDIALOG_H
+
+#include "abstractdialog.h"
+
+class QLineEdit;
+class QSpinBox;
+class QLabel;
+class NewItemDialog : public AbstractDialog {
+ public:
+  NewItemDialog(QWidget* parent = nullptr);
+
+  void createContent() override;
+
+ private:
+  QLabel* m_nameLabel   = nullptr;
+  QLineEdit* m_nameEdit = nullptr;
+
+  QLabel* m_descriptionLabel   = nullptr;
+  QLineEdit* m_descriptionEdit = nullptr;
+
+  QLabel* m_infoLabel   = nullptr;
+  QLineEdit* m_infoEdit = nullptr;
+
+  QLabel* m_amountLabel = nullptr;
+  QSpinBox* m_amountBox = nullptr;
+
+  QLabel* m_factorLabel = nullptr;
+  QSpinBox* m_factorBox = nullptr;
+};
+
+#endif  // NEWITEMDIALOG_H

mainwindow.cpp

@@ -5,6 +5,7 @@
 #include <QMessageBox>
 
 #include "../../ApplicationConfig.h"
+#include "Dialogs/newitemdialog.h"
 #include "data/settingshandler.h"
 #include "genericcore.h"
 
@@ -30,13 +31,14 @@ MainWindow::MainWindow(QWidget* parent)
   setWindowIcon(QIcon(iconString));
 #endif
 
-  createActions();
-  createHelpMenu();
-
   const QVariantMap settings = SettingsHandler::getSettings("GUI");
   restoreGeometry(settings.value("geometry").toByteArray());
   restoreState(settings.value("windowState").toByteArray());
 
+  createActions();
+  createHelpMenu();
+  createGuiDialogs();
+
   connect(m_core.get(), &GenericCore::displayStatusMessage, this,
           &MainWindow::displayStatusMessage);
   connect(this, &MainWindow::displayStatusMessage, this, &MainWindow::showStatusMessage);
@@ -125,14 +127,11 @@ void MainWindow::on_pushButton_clicked() {
   ui->label->setText(prefix + m_core->toString());
 }
 
-void MainWindow::createHelpMenu() {
-  QMenu* helpMenu = ui->menu_Help;
-  helpMenu->addSeparator();
-  QAction* aboutAct = helpMenu->addAction(tr("&About"), this, &MainWindow::onAboutClicked);
-  aboutAct->setStatusTip(tr("Show the application's About box"));
+void MainWindow::openNewItemDialog() {
+  showStatusMessage(tr("Invoked 'Edit|New Item'"));
+  qInfo() << "'open new item dialog' action triggered...";
 
-  QAction* aboutQtAct = helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt);
-  aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
+  m_newItemDialog->show();
 }
 
 void MainWindow::createActions() {
@@ -228,8 +227,8 @@ void MainWindow::createEditActions() {
   m_openNewItemDialogAct = make_unique<QAction>(tr("&New item"), this);
   m_openNewItemDialogAct->setShortcut(QKeySequence::New);
   m_openNewItemDialogAct->setStatusTip(tr("Opens a dialog to add a new item"));
-  // connect(m_openNewItemDialogAct, &QAction::triggered, this, &MainWindow::openNewItemDialog);
-  m_openNewItemDialogAct->setEnabled(false);
+  connect(m_openNewItemDialogAct.get(), &QAction::triggered, this, &MainWindow::openNewItemDialog);
+  // m_openNewItemDialogAct->setEnabled(false);
   ui->menu_Edit->addAction(m_openNewItemDialogAct.get());
 
   m_openEditItemDialogAct = make_unique<QAction>(tr("&Edit item"), this);
@@ -255,3 +254,18 @@ void MainWindow::createEditActions() {
   m_findItemAct->setEnabled(false);
   ui->menu_Edit->addAction(m_findItemAct.get());
 }
+
+void MainWindow::createHelpMenu() {
+  QMenu* helpMenu = ui->menu_Help;
+  helpMenu->addSeparator();
+  QAction* aboutAct = helpMenu->addAction(tr("&About"), this, &MainWindow::onAboutClicked);
+  aboutAct->setStatusTip(tr("Show the application's About box"));
+
+  QAction* aboutQtAct = helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt);
+  aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
+}
+
+void MainWindow::createGuiDialogs() {
+  m_newItemDialog = make_unique<NewItemDialog>(this);
+  m_newItemDialog->createContent();
+}

mainwindow.h

@@ -3,10 +3,11 @@
 
 #include <QMainWindow>
 
-QT_BEGIN_NAMESPACE
-
+class NewItemDialog;
 class QAbstractItemModel;
 
+QT_BEGIN_NAMESPACE
+
 namespace Ui {
 class MainWindow;
 }
@@ -37,6 +38,9 @@ class MainWindow : public QMainWindow {
 
   void on_pushButton_clicked();
 
+  /// slots for menu actions
+  void openNewItemDialog();
+
  private:
   Ui::MainWindow* ui;
 
@@ -63,10 +67,14 @@ class MainWindow : public QMainWindow {
   unique_ptr<QAction> m_deleteItemAct;
   unique_ptr<QAction> m_findItemAct;
 
+  /// Dialogs
+  unique_ptr<NewItemDialog> m_newItemDialog;
+
   /// Setup functions
   void createActions();
   void createFileActions();
   void createEditActions();
   void createHelpMenu();
+  void createGuiDialogs();
 };
 #endif  // MAINWINDOW_H