QStyledItemDelegate does not show desired Widget in the cells of QTableView - qt

Question

I want to test how to put QSpinBox into cells of QTableView in Qt 6.2.2, but the delegate does not appear to work, which means it does not show QSpinBox in the cells, and I've tested the delegate member functions by qDebug which reveals that none of these functions work! could anyone help to fix the problem? Many thanks in advance!
Below is the code:
testtabledelegate.h
#ifndef TESTTABLEDELEGATE_H
#define TESTTABLEDELEGATE_H
#include <QStyledItemDelegate>
#include <QWidget>
class TestTableDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
TestTableDelegate(QObject *parent = nullptr);
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
void setEditorData(QWidget *editor, const QModelIndex &index) const;
void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;
private:
};
#endif // TESTTABLEDELEGATE_H
testtabledelegate.cpp
#include "testtabledelegate.h"
#include <QSpinBox>
TestTableDelegate::TestTableDelegate(QObject *parent) : QStyledItemDelegate(parent)
{
}
QWidget *TestTableDelegate ::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
qDebug() << "Draw Control";
Q_UNUSED(option);
Q_UNUSED(index);
QSpinBox *editor = new QSpinBox(parent);
editor->setFrame(false);
editor->setMinimum(0);
editor->setMaximum(10000);
return editor;
}
void TestTableDelegate ::setEditorData(QWidget *editor, const QModelIndex &index) const
{
int value = index.model()->data(index, Qt::EditRole).toInt();
QSpinBox *spinBox = static_cast<QSpinBox*>(editor);
spinBox->setValue(value);
}
void TestTableDelegate ::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
QSpinBox *spinBox = static_cast<QSpinBox*>(editor);
spinBox->interpretText();
int value = spinBox->value();
model->setData(index, value, Qt::EditRole);
}
void TestTableDelegate ::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
Q_UNUSED(index);
editor->setGeometry(option.rect);
}
testtablemodel.h
#ifndef TESTTABLEMODEL_H
#define TESTTABLEMODEL_H
#include <QAbstractTableModel>
class TestTableModel : public QAbstractTableModel
{
Q_OBJECT
public:
explicit TestTableModel(QObject *parent = nullptr);
protected:
int rowCount(const QModelIndex &parent) const;
int columnCount(const QModelIndex &parent) const;
QVariant headerData(int section, Qt::Orientation orientation, int role) const;
QVariant data(const QModelIndex &index, int role) const;
private:
//QStringList *testList = QStringList() << "R1" << "R2" << "R3" << "R4" << "R5";
};
#endif // TESTTABLEMODEL_H
testtablemodel.cpp
#include "testtablemodel.h"
TestTableModel::TestTableModel(QObject *parent) : QAbstractTableModel(parent)
{
}
int TestTableModel::rowCount(const QModelIndex &parent) const
{
return 5;
}
int TestTableModel::columnCount(const QModelIndex &parent) const
{
return 5;
}
QVariant TestTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if (role == Qt::DisplayRole)
{
if (orientation == Qt::Horizontal)
return QStringLiteral("Field %1").arg(section);
else if (orientation == Qt::Vertical)
return section + 1;
else
return(QVariant());
}
else
return(QVariant());
}
QVariant TestTableModel::data(const QModelIndex &index, int role) const
{
if (role == Qt::DisplayRole)
{
return index.row();
}
else if (role == Qt::TextAlignmentRole)
{
return Qt::AlignCenter;
}
else
{
return QVariant();
}
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
//#include "testtableheader.h"
#include "testtablemodel.h"
#include "testtabledelegate.h"
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private:
Ui::MainWindow *ui;
TestTableModel *testModel = new TestTableModel();
TestTableDelegate *testDelegate = new TestTableDelegate(this);
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTableView>
#include <QStyledItemDelegate>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->tableView->setAlternatingRowColors(true);
ui->tableView->setModel(testModel);
ui->tableView->setItemDelegate(testDelegate);
}
MainWindow::~MainWindow()
{
delete ui;
}
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}