CheckBoxDelegate::CheckBoxDelegate(QObject *parent)
: QItemDelegate(parent)
{
}

QWidget *CheckBoxDelegate::createEditor(QWidget *parent,const QStyleOptionViewItem &option,const QModelIndex &index) const {
  if(index.isValid()&&index.column()== 9 ) {
    QCheckBox *editor=new QCheckBox(parent);
    editor->installEventFilter(const_cast<CheckBoxDelegate*>(this));
    return editor;
  } else {
    return QItemDelegate::createEditor(parent,option,index);
  }
}

void CheckBoxDelegate::setEditorData(QWidget *editor,const QModelIndex &index) const {
  if(index.isValid()&&index.column()== 9 ) {
    QString value=index.model()->data(index,Qt::DisplayRole).toString();
    QCheckBox *checkBox=static_cast<QCheckBox*>(editor);
    if (value=="true")
      checkBox->setCheckState(Qt::Checked);
    else
      checkBox->setCheckState(Qt::Unchecked);
  } else {
    QItemDelegate::setEditorData(editor,index);
  }
}

void CheckBoxDelegate::setModelData(QWidget *editor,QAbstractItemModel *model,const QModelIndex &index) const {
  if(index.isValid()&&index.column()== 9 ) {
    QCheckBox *checkBox=static_cast<QCheckBox*>(editor);
    QString value;
    if (checkBox->checkState()==Qt::Checked)
      value="true";
    else
      value="false";
    model->setData(index,value);
  } else {
    QItemDelegate::setModelData(editor,model,index);
  }
}

void CheckBoxDelegate::updateEditorGeometry(QWidget *editor,const QStyleOptionViewItem &option,const QModelIndex &index) const {
  if(index.isValid()&&index.column()== 9 )
    editor->setGeometry(option.rect);
  else
    QItemDelegate::updateEditorGeometry(editor,option,index);
}

CheckBoxDelegate *delegate=new CheckBoxDelegate;
mainWindow.table_main->setItemDelegate(delegate);