QSqlTableModel: Where can I get whether a row is marked as removed - qt

Question

If I call removeRows on records which were read from the database a ! will be displayed in the first column of the tableView.
The only thing which I would like to achieve is that this row will not be displayed in the view. I tried it with QSortFilterProxyModel but I don't know where I can get the flag which is used to display the ! in the first column. Is there a way to set a filter in QSortFilterProxyModel that it only contains the rows which don't have this flag?
From where does the view take the information, that the removed row is marked with a "!" ? This information might be hidden somewhere in the model, but I cannot find out where.
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),
m_ui(new Ui::MainWindow),
m_model(new QSqlTableModel(this)),
m_proxyModel(new QSortFilterProxyModel(this))
{
m_ui->setupUi(this);
m_model->setTable("test");
m_model->setEditStrategy(QSqlTableModel::OnManualSubmit);
m_model->select();
m_proxyModel->setSourceModel(m_model);
m_ui->tableView->setModel(m_proxyModel);
qDebug() << "Select : Row count:" << m_model->rowCount();
connect(m_ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged,
this, &MainWindow::on_selectionChanged);
}
MainWindow::~MainWindow()
{
delete m_ui;
}
void MainWindow::on_pushButtonNewRecord_clicked()
{
qDebug() << "New Record";
m_record = m_model->record();
m_record.setValue("firstname", "john");
m_record.setValue("lastname", "doe");
m_record.setValue("email", "john.doe#email.com");
m_model->insertRecord(-1, m_record);
qDebug() << "New Record : Row count:" << m_model->rowCount();
}
void MainWindow::on_pushButtonRemoveRow_clicked()
{
qDebug() << "Remove Row";
if (m_row >= 0) {
m_proxyModel->removeRow(m_row);
qDebug() << "Remove Record: Row count:" << m_model->rowCount();
}
for (int i = 0; i < m_model->rowCount(); i++) {
qDebug() << "\n";
qDebug() << "Remove Row: index :" << m_model->index(i, 0);
qDebug() << "Remove Row: isValid:" << m_model->index(i, 0).isValid();
qDebug() << "Remove Row: isDirty:" << m_model->isDirty(m_model->index(i, 0));
qDebug() << "Remove Row: flags :" << m_model->index(i, 0).flags();
qDebug() << "Remove Row: data :" << m_model->index(i, 0).data(Qt::DisplayRole);
qDebug() << "Remove Row: heaader:" << m_model->headerData(i, Qt::Vertical);
QVariant verticalHeader = m_model->headerData(i, Qt::Vertical);
if (verticalHeader == "!") {
qDebug() << "Deleted";
}
//qDebug() << m_model->record(i);
}
}
void MainWindow::on_pushButtonSubmit_clicked()
{
qDebug() << "Submit";
m_model->submitAll();
m_model->select();
}
void MainWindow::on_selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
Q_UNUSED(deselected)
if (!selected.isEmpty()) {
m_row = selected.indexes().first().row();
}
}

Answer 1

You have to implement a QSortFilterProxyModel that filters the rows that are Dirty and whose vertical header text is "!", You must also call the invalidate() method to force the application of the filter.
dirtyfilterproxymodel.h
#ifndef DIRTYFILTERPROXYMODEL_H
#define DIRTYFILTERPROXYMODEL_H
#include <QSortFilterProxyModel>
#include <QSqlTableModel>
class DirtyFilterProxyModel : public QSortFilterProxyModel
{
public:
using QSortFilterProxyModel::QSortFilterProxyModel;
protected:
bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
{
if(QSqlTableModel *source_model = qobject_cast<QSqlTableModel *>(sourceModel())){
QModelIndex ix = source_model->index(source_row, 0, source_parent);
QString row_header_item = source_model->headerData(source_row, Qt::Vertical, Qt::DisplayRole).toString();
return !(source_model->isDirty(ix) && row_header_item == QLatin1String("!"));
}
return QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent);
}
};
#endif // DIRTYFILTERPROXYMODEL_H
mainwindow.h
// ...
class DirtyFilterProxyModel;
// ...
class MainWindow : public QMainWindow
{
// ...
private:
Ui::MainWindow *m_ui;
DirtyFilterProxyModel *m_proxyModel;
// ...
mainwindow.cpp
#include "dirtyfilterproxymodel.h"
// ...
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),
m_ui(new Ui::MainWindow),
m_model(new QSqlTableModel(this)),
m_proxyModel(new DirtyFilterProxyModel(this))
{
// ...
}
void MainWindow::on_pushButtonNewRecord_clicked()
{
// ...
m_model->insertRecord(-1, m_record);
m_proxyModel->invalidate();
}
// ...
void MainWindow::on_pushButtonRemoveRow_clicked()
{ if (m_row >= 0) {
m_proxyModel->removeRow(m_row);
m_proxyModel->invalidate();
}
}