QTableWidget使用自定义代理

QTableWidget表格使用自定义代理，以QLineEdit为例

继承QItemDelegate类
主要重写四个方法
createEditor()
setEditorData()
setModelData()
updateEditorGeometry()

#include <QItemDelegate>
#include <QLineEdit>
class TableItemEditDelegate :  public  QItemDelegate
{
    Q_OBJECT
public :
    TableItemEditDelegate(QObject *parent = nullptr) : QItemDelegate(parent){}

    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
    {
        Q_UNUSED(option);
        Q_UNUSED(index);
        QLineEdit *editor = new QLineEdit(parent);
        editor->setValidator(new QRegExpValidator(QRegExp("^[0-9]{1,6}$")));
        return editor;
    }

    void setEditorData(QWidget *editor, const QModelIndex &index) const
    {
        QLineEdit *control = dynamic_cast<QLineEdit*>(editor);
        control->setText(index.model()->data(index, Qt::EditRole).toString());
    }

    void setModelData(QWidge