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