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.

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;
+}