Added a ModelSummary class to make the overview over the model content accessible via QProperty system & a SummaryWidget to show this information. Only property rowCount as a proof of concept. Other properties will follow.

UIs/BeetRoundWidgets/CMakeLists.txt

@@ -37,6 +37,7 @@ if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
         widgets/comboboxdelegate.h widgets/comboboxdelegate.cpp
         widgets/spinboxdelegate.h widgets/spinboxdelegate.cpp
         widgets/biddingroundcontrol.h widgets/biddingroundcontrol.cpp
+        widgets/summarywidget.h widgets/summarywidget.cpp
     )
 # Define target properties for Android with Qt 6 as:
 #    set_property(TARGET ${TARGET_APP} APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR

UIs/BeetRoundWidgets/mainwindow.cpp

@@ -16,10 +16,12 @@
 #include "genericcore.h"
 #include "model/generalsortfiltermodel.h"
 #include "model/metadata.h"
+#include "model/modelsummary.h"
 #include "model/tablemodel.h"
 #include "widgets/biddingroundcontrol.h"
 #include "widgets/comboboxdelegate.h"
 #include "widgets/spinboxdelegate.h"
+#include "widgets/summarywidget.h"
 
 static int intColumnWidth = 30;
 
@@ -349,6 +351,8 @@ void MainWindow::setupModelViews() {
   ui->tableView->setModel((QAbstractItemModel*)m_proxyModel.get());
   ui->tableView->setSortingEnabled(true);
   ui->tableView->setColumnWidth(0, intColumnWidth);
+
+  m_modelSummary = m_core->getModelSummary();
 }
 
 void MainWindow::createActions() {
@@ -554,5 +558,8 @@ void MainWindow::setupEventTab() {
   connect(m_core.get(), &GenericCore::currentBiddingRoundChanged, m_biddingRoundControl.get(),
           &BiddingRoundControl::onCurrentBiddingRoundChanged);
 
+  SummaryWidget* summaryWidget = new SummaryWidget(m_modelSummary, this);
+  containerLayout->addWidget(summaryWidget);
+
   ui->tabWidget->insertTab(0, containerWidget, "Event (&1)");
 }

UIs/BeetRoundWidgets/mainwindow.h

@@ -17,6 +17,7 @@ QT_END_NAMESPACE
 class GenericCore;
 class TableModel;
 class GeneralSortFilterModel;
+class ModelSummary;
 class NewItemDialog;
 class EditItemDialog;
 class BiddingRoundControl;
@@ -73,9 +74,12 @@ class MainWindow : public QMainWindow {
 
   unique_ptr<GenericCore> m_core;
   shared_ptr<GeneralSortFilterModel> m_proxyModel;
+  shared_ptr<ModelSummary> m_modelSummary;
+
   QUndoStack* m_modelUndoStack;
   unique_ptr<QUndoView> m_modelUndoView;
   unique_ptr<BiddingRoundControl> m_biddingRoundControl;
+
   /// File actions
   unique_ptr<QAction> m_newFileAct;
   unique_ptr<QAction> m_openAct;

UIs/BeetRoundWidgets/widgets/summarywidget.cpp

@@ -0,0 +1,30 @@
+#include "summarywidget.h"
+
+#include <QLabel>
+#include <QProperty>
+#include <QVBoxLayout>
+
+#include <model/modelsummary.h>
+
+SummaryWidget::SummaryWidget(std::shared_ptr<ModelSummary> modelSummary, QWidget* parent)
+    : QWidget{parent}
+    , m_modelSummary(modelSummary) {
+  QVBoxLayout* mainLayout = new QVBoxLayout(this);
+
+  QProperty<int> nRows(-1);
+
+  QHBoxLayout* footerLayout = new QHBoxLayout();
+  QLabel* rowCountLabel     = new QLabel("Row count:");
+  m_rowCoundValueLabel      = new QLabel(QString::number(nRows));
+
+  QObject::connect(m_modelSummary.get(), &ModelSummary::rowCountChanged, [&]() {
+    m_rowCoundValueLabel->setText(QString::number(m_modelSummary->rowCount()));
+  });
+  m_modelSummary->bindableRowCount().setBinding([&]() { return nRows.value(); });
+
+  footerLayout->addWidget(rowCountLabel);
+  footerLayout->addWidget(m_rowCoundValueLabel);
+  mainLayout->addLayout(footerLayout);
+
+  setLayout(mainLayout);
+}

UIs/BeetRoundWidgets/widgets/summarywidget.h

@@ -0,0 +1,21 @@
+#ifndef SUMMARYWIDGET_H
+#define SUMMARYWIDGET_H
+
+#include <QWidget>
+
+class ModelSummary;
+class QLabel;
+
+class SummaryWidget : public QWidget {
+  Q_OBJECT
+
+ public:
+  explicit SummaryWidget(std::shared_ptr<ModelSummary> modelSummary, QWidget* parent = nullptr);
+
+ private:
+  std::shared_ptr<ModelSummary> m_modelSummary;
+
+  QLabel* m_rowCoundValueLabel;
+};
+
+#endif  // SUMMARYWIDGET_H

libs/BeetRoundCore/CMakeLists.txt

@@ -32,6 +32,7 @@ add_library(${TARGET_APP} STATIC
   model/tablemodel.h model/tablemodel.cpp
   model/modelitem.h model/modelitem.cpp
   model/generalsortfiltermodel.h model/generalsortfiltermodel.cpp
+  model/modelsummary.h model/modelsummary.cpp
   model/commands/insertrowscommand.h model/commands/insertrowscommand.cpp
   model/commands/removerowscommand.h model/commands/removerowscommand.cpp
   model/commands/edititemcommand.h model/commands/edititemcommand.cpp

libs/BeetRoundCore/genericcore.cpp

@@ -17,11 +17,10 @@
 #include "data/settingshandler.h"
 #include "model/generalsortfiltermodel.h"
 #include "model/metadata.h"
+#include "model/modelsummary.h"
 #include "model/tablemodel.h"
 #include "network/servercommunicator.h"
 
-using namespace std;
-
 GenericCore::GenericCore() {
   qDebug() << "Creating core...";
 
@@ -97,6 +96,8 @@ std::shared_ptr<GeneralSortFilterModel> GenericCore::getSortFilterModel() const
   return m_sortFilterModel;
 }
 
+shared_ptr<ModelSummary> GenericCore::getModelSummary() const { return m_modelSummary; }
+
 /**
  * Save items to default file (in standard location).
  * @brief GenericCore::saveItems Saves item fo file.
@@ -163,6 +164,8 @@ void GenericCore::setupModels() {
   m_mainModel       = make_shared<TableModel>(m_modelUndoStack, this);
   m_sortFilterModel = make_shared<GeneralSortFilterModel>(m_mainModel);
 
+  m_modelSummary = make_shared<ModelSummary>(m_mainModel, this);
+
   /// QAbstractItemModelTester
 #ifdef QT_DEBUG
   m_mainModelTester = make_unique<QAbstractItemModelTester>(

libs/BeetRoundCore/genericcore.h

@@ -14,8 +14,11 @@ class QString;
 
 class TableModel;
 class GeneralSortFilterModel;
+class ModelSummary;
 class ServerCommunicator;
 
+using namespace std;
+
 class GenericCore : public QObject {
   Q_OBJECT
 
@@ -30,8 +33,10 @@ class GenericCore : public QObject {
   void triggerApplicationUpdate(const bool saveChanges);
 
   QUndoStack* getModelUndoStack() const;
-  std::shared_ptr<TableModel> getModel() const;
-  std::shared_ptr<GeneralSortFilterModel> getSortFilterModel() const;
+
+  shared_ptr<TableModel> getModel() const;
+  shared_ptr<GeneralSortFilterModel> getSortFilterModel() const;
+  shared_ptr<ModelSummary> getModelSummary() const;
 
   void saveItems();
   void importCSVFile(const QString& filePath);
@@ -60,10 +65,11 @@ class GenericCore : public QObject {
 
  private:
   QUndoStack* m_modelUndoStack;
-  std::shared_ptr<TableModel> m_mainModel;
-  std::shared_ptr<GeneralSortFilterModel> m_sortFilterModel;
-  std::unique_ptr<QAbstractItemModelTester> m_mainModelTester;
-  std::unique_ptr<QAbstractItemModelTester> m_proxyModelTester;
+  shared_ptr<TableModel> m_mainModel;
+  shared_ptr<GeneralSortFilterModel> m_sortFilterModel;
+  shared_ptr<ModelSummary> m_modelSummary;
+  unique_ptr<QAbstractItemModelTester> m_mainModelTester;
+  unique_ptr<QAbstractItemModelTester> m_proxyModelTester;
 
   void setupModels();
   void initModelData();
@@ -71,7 +77,7 @@ class GenericCore : public QObject {
   QString getMaintenanceToolFilePath() const;
 
   /// Network communication
-  std::unique_ptr<ServerCommunicator> m_serverCommunicator;
+  unique_ptr<ServerCommunicator> m_serverCommunicator;
   void setupServerConfiguration();
   void applyServerConfiguration();
 };

libs/BeetRoundCore/model/modelsummary.cpp

@@ -0,0 +1,22 @@
+#include "modelsummary.h"
+
+#include "tablemodel.h"
+
+ModelSummary::ModelSummary(std::shared_ptr<TableModel> model, QObject* parent)
+    : QObject(parent)
+    , m_model(model) {
+  Q_ASSERT(model);
+  connect(m_model.get(), &TableModel::rowCountChanged, this, &ModelSummary::rowCountChanged);
+}
+
+ModelSummary::~ModelSummary() {}
+
+int ModelSummary::rowCount() const {
+  const int nRows = m_model->rowCount();
+  return nRows;
+}
+
+QBindable<int> ModelSummary::bindableRowCount() {
+  m_rowCount = m_model->rowCount();
+  return &m_rowCount;
+}

libs/BeetRoundCore/model/modelsummary.h

@@ -0,0 +1,32 @@
+#ifndef MODELSUMMARY_H
+#define MODELSUMMARY_H
+
+#include <QObject>
+#include <QProperty>
+
+class TableModel;
+
+using namespace std;
+
+class ModelSummary : public QObject {
+  Q_OBJECT
+
+  Q_PROPERTY(int rowCount READ rowCount NOTIFY rowCountChanged BINDABLE bindableRowCount)
+
+ public:
+  ModelSummary(shared_ptr<TableModel> model, QObject* parent = nullptr);
+  ~ModelSummary();
+
+  int rowCount() const;
+  QBindable<int> bindableRowCount();
+
+ signals:
+  void rowCountChanged();
+
+ private:
+  shared_ptr<TableModel> m_model;
+
+  Q_OBJECT_BINDABLE_PROPERTY(ModelSummary, int, m_rowCount, &ModelSummary::rowCountChanged);
+};
+
+#endif  // MODELSUMMARY_H

libs/BeetRoundCore/model/tablemodel.cpp

@@ -46,7 +46,10 @@ QByteArray TableModel::generateExampleItems() {
 
 TableModel::TableModel(QUndoStack* undoStack, QObject* parent)
     : QAbstractTableModel{parent}
-    , m_undoStack(undoStack) {}
+    , m_undoStack(undoStack) {
+  connect(this, &TableModel::rowsInserted, this, &TableModel::onRowCountChanged);
+  connect(this, &TableModel::rowsRemoved, this, &TableModel::onRowCountChanged);
+}
 
 Qt::ItemFlags TableModel::flags(const QModelIndex& index) const {
   if (!index.isValid()) {
@@ -279,6 +282,16 @@ void TableModel::insertItems(int startPosition,
   m_undoStack->push(insertCommand);
 }
 
+void TableModel::onRowCountChanged(const QModelIndex& parent, int first, int last) {
+  Q_UNUSED(first);
+  Q_UNUSED(last);
+
+  if (parent != QModelIndex()) {
+    return;
+  }
+  emit rowCountChanged();
+}
+
 void TableModel::execInsertItems(const int firstRow, const QList<ModelItemValues> valueList) {
   const int nRows = valueList.size();
   qDebug() << "Inserting" << nRows << "items...";

libs/BeetRoundCore/model/tablemodel.h

@@ -2,6 +2,7 @@
 #define TABLEMODEL_H
 
 #include <QAbstractTableModel>
+#include "metadata.h"
 
 class QUndoStack;
 class ModelItem;
@@ -55,6 +56,12 @@ class TableModel : public QAbstractTableModel {
                    const QList<ModelItemValues>& itemValuesList,
                    const QModelIndex& parentIndex = QModelIndex());
 
+ signals:
+  void rowCountChanged();
+
+ private slots:
+  void onRowCountChanged(const QModelIndex& parent, int first, int last);
+
  private:
   /// *** members ***
   // TODO shared_ptr -> unique_ptr