如何使用QDataWidgetMapper恢复对象的动态属性？

Question

我有一个窗体对话框QDialog使用QDataWidgetMapper更新QTableView行的数据。该项目包含QString数据，但我只想显示QCheckBox并使用QCheckbox上的动态属性在后台设置状态更改的值。

所有事件（toFirst，toLast，toNext，toPrevious，submit）按预期工作，但恢复不撤销显示的状态。

有没有可以使用的信号？或者我应该尝试覆盖恢复槽？任何建议？

（代码去除，以保持它的简单等小部件）

EditDialog::EditDialog(QStandardItemModel &model, QModelIndex &current, QWidget *parent) 
    : QDialog(parent) 
{ 
    cbHomeCLI = new QCheckBox(); 
    // other widgets ...... 

    dataMapper->setModel(&model); 
    dataMapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit); 
    dataMapper->addMapping(cbHomeCLI,3,"useCLI"); 

    // button connects for toFirst, toXXXX, ..., here ....   
    connect(bttnDiscard,&QPushButton::clicked,dataMapper,&QDataWidgetMapper::revert); 
    connect(cbHomeCLI,&QCheckBox::stateChanged,this,&EditDialog::changeProperty); 
    connect(dataMapper,&QDataWidgetMapper::currentIndexChanged,this,&EditDialog::initState); 

    QGridLayout *layout(new QGridLayout()); 
    layout->addWidget(cbHomeCLI,2,2); 

    setLayout(layout); 
    setWindowTitle("...."); 

    dataMapper->setCurrentModelIndex(current); 
} 

void EditDialog::initState(int row) 
{ 
    QStandardItemModel *mdl = qobject_cast<QStandardItemModel *>(dataMapper->model()); 

    if (mdl->item(row,3)->text() == "*31#") 
     cbHomeCLI->setChecked(true); 
    else 
     cbHomeCLI->setChecked(false); 
} 

void EditDialog::changeProperty(int state) 
{ 
    QCheckBox *from = qobject_cast<QCheckBox *>(sender()); 

    if (state) 
     from->setProperty("useCLI",QString("*31#")); 
    else 
     from->setProperty("useCLI",QString("")); 
} 

Answer 1

终于找到了解决办法。设置在EditDialog构造的eventFilter与

cbHomeCLI->installEventFilter(this); 

而且eventFilter使用PropertyChanged事件

bool EditDialog::eventFilter(QObject *obj, QEvent *event) 
{ 
    if (event->type() == QEvent::DynamicPropertyChange) 
    { 
     QDynamicPropertyChangeEvent *propEvent = static_cast<QDynamicPropertyChangeEvent *>(event); 
     if (propEvent->propertyName() == "useCLI") 
     { 
      QCheckBox *cb = qobject_cast<QCheckBox *>(obj); 
      if (cb->property("useCLI") == "") 
       cb->setChecked(false); 
      else 
       cb->setChecked(true); 
      return true; 
     } 
    } 
    // standard event processing 
    return QObject::eventFilter(obj, event); 
}