//delete.h

#ifndef DELEGATE_H

#define DELEGATE_H

#include<QItemDelegate>

#include<QModelIndex>

#include<QObject>

#include<QSize>

#include<QSpinBox>

#include<QWidget>

class Delegate : public QItemDelegate

{

    Q_OBJECT

public:

    explicit Delegate(QObject *parent = 0);

    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;

};

#endif // DELEGATE_H

//dialog.h

#ifndef DIALOG_H

#define DIALOG_H

#include"delegate.h"

#include <QDialog>

#include<QtCore>

#include<QtGui>

#include<QModelIndex>

#include<QStandardItemModel>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

public:

    explicit Dialog(QWidget *parent = 0);

    ~Dialog();

private:

    Ui::Dialog *ui;

    QStandardItemModel *model;

    Delegate *mydelegate;

};

#endif // DIALOG_H

//delegate.cpp

#include "delegate.h"

Delegate::Delegate(QObject *parent):QItemDelegate(parent)

{

}

QWidget *Delegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const

{

    QSpinBox *editor = new QSpinBox(parent);

    editor->setMinimum(0);

    editor->setMaximum(100);

    return editor;

}

void Delegate::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 Delegate::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 Delegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const

{

    editor->setGeometry(option.rect);

}

//dialog.cpp

#include "dialog.h"

#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

    mydelegate = new Delegate(this);

    model = new QStandardItemModel(4,2,this);

    for(int row = 0; row < 4; ++row)

    {

        for(int col = 0; col < 2; ++col)

        {

            QModelIndex index = model->index(row,col,QModelIndex());

            model->setData(index,0);

        }

    }

    ui->tableView->setModel(model);

    ui->tableView->setItemDelegate(mydelegate);

}

Dialog::~Dialog()

{

    delete ui;

}

//main.cpp

#include "dialog.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Dialog w;

    w.show();

    return a.exec();

}