QItemDelegate edit某个控件后把数据写回model

QWidget *TrackDelegate::createEditor(QWidget *parent,

                                     const QStyleOptionViewItem &option,

                                     const QModelIndex &index) const

{

    if (index.column() == durationColumn) {

        //QTimeEdit *timeEdit = new QTimeEdit(parent);

        QComboBox *timeEdit = new QComboBox(parent);

        //timeEdit->installEventFilter(const_cast<TrackDelegate*>(this));

        timeEdit->setObjectName("timeEdit");

//        timeEdit->setDisplayFormat("mm:ss");

//        connect(timeEdit, SIGNAL(editingFinished()),

//                this, SLOT(commitAndCloseEditor()));

        timeEdit->insertItem(0,"test1");

        timeEdit->insertItem(1,"test2");

        return timeEdit;

    } else {

        return QItemDelegate::createEditor(parent, option, index);

    }

}
void TrackDelegate::setEditorData(QWidget *editor,

                                  const QModelIndex &index) const

{

    if (index.column() == durationColumn) {

         QComboBox *timeEdit = qobject_cast<QComboBox *>(editor);

         timeEdit->setCurrentIndex(1);

//        int secs = index.model()->data(index, Qt::DisplayRole).toInt();

//        QTimeEdit *timeEdit = qobject_cast<QTimeEdit *>(editor);

//        timeEdit->setTime(QTime(0, secs / 60, secs % 60));

    } else {

        QItemDelegate::setEditorData(editor, index);

    }

}

void TrackDelegate::setModelData(QWidget *editor,QAbstractItemModel *model,

                                 const QModelIndex &index) const

{

    if (index.column() == durationColumn) {

//        QTimeEdit *timeEdit = qobject_cast<QTimeEdit *>(editor);

//        QTime time = timeEdit->time();

//        int secs = (time.minute() * 60) + time.second();

//        model->setData(index, secs);

    } else {

        QItemDelegate::setModelData(editor, model, index);

    }

}
上述三个方法是实现tableview编辑某个单元格出现控件的主要方法
其中第三个方法TrackDelegate::setModelData
是实现把编辑的控件发的数据写回到model中，但这个方法什么时候会调用？
当你编辑完控件后点击tableview其他单元格后会调用该方法
或者代码添加emit commitData(editor);就会立马执行该方法。