#include <QCoreApplication>
#include <QStandardItemModel>
#include <QSortFilterProxyModel>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QStandardItemModel baseModel;
    QSortFilterProxyModel proxyModel;

    /************proxyModel can't emit datachanged*************************/
    baseModel.insertRows(0, 1);
    baseModel.insertColumns(0, 1);
    /********************************************************************/

    proxyModel.setSourceModel(&baseModel);

    /************proxyModel can emit datachanged*************************/
//    baseModel.insertRows(0, 1);
//    baseModel.insertColumns(0, 1);
    /********************************************************************/

    QObject::connect(&baseModel, &QStandardItemModel::dataChanged, []{
       qDebug()<<"dataChanged emitted for the base model.";
    });
    QObject::connect(&proxyModel, &QSortFilterProxyModel::dataChanged, []{
       qDebug()<<"dataChanged emitted for the proxy model.";
    });

    baseModel.setData(baseModel.index(0, 0), QStringLiteral("new data"), Qt::DisplayRole);

    return a.exec();
}