在c+中对QStandardItemModel进行排序+；Qt

我有一个QStandarItemModel类型的模型，它看起来像这样：

          QHash<int, QByteArray> roleNames;
          roleNames[Car2goVehicle::NameRole] =  "plate_number";
          roleNames[Car2goVehicle::DescriptionRole] = "address";
          roleNames[Car2goVehicle::FuelRole] = "fuel";
          roleNames[Car2goVehicle::InteriorRole] = "interior";
          roleNames[Car2goVehicle::ExteriorRole] = "exterior";
          roleNames[Car2goVehicle::VinRole] = "vin";
          roleNames[Car2goVehicle::LatRole] = "lat";
          roleNames[Car2goVehicle::LonRole] = "lon";
          roleNames[Car2goVehicle::DistanceRole] = "distance";
          d->m_vehiclesmodel = new RoleItemModel(roleNames);

enum Role {
    NameRole=Qt::UserRole,
    DistanceRole,
    ...
};

但结果是错误的。有人能告诉我怎么分类吗

---

谢谢。

结果怎么了？ 在大多数情况下，不会对模型本身进行排序，而是对视图进行排序。以下是文档中的示例：

QTreeView *treeView = new QTreeView;
MyItemModel *sourceModel = new MyItemModel(this);
QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel(this);

proxyModel->setSourceModel(sourceModel);
treeView->setModel(proxyModel);

在上面的示例中，您可能会混淆角色和列。您的角色枚举应如下所示：

          QHash<int, QByteArray> roleNames;
          roleNames[Car2goVehicle::NameRole] =  "plate_number";
          roleNames[Car2goVehicle::DescriptionRole] = "address";
          roleNames[Car2goVehicle::FuelRole] = "fuel";
          roleNames[Car2goVehicle::InteriorRole] = "interior";
          roleNames[Car2goVehicle::ExteriorRole] = "exterior";
          roleNames[Car2goVehicle::VinRole] = "vin";
          roleNames[Car2goVehicle::LatRole] = "lat";
          roleNames[Car2goVehicle::LonRole] = "lon";
          roleNames[Car2goVehicle::DistanceRole] = "distance";
          d->m_vehiclesmodel = new RoleItemModel(roleNames);

enum Role {
    NameRole=Qt::UserRole,
    DistanceRole,
    ...
};

如果要按距离角色排序，请调用：

model->setSortRole( Car2goVehicle::DistanceRole );

然后，按某个列（与角色无关）排序，例如第0列：

model->sort( 0, Qt::AscendingOrder );

---

如果

QStandardItemModel:：sort（）

足够强大，我不建议使用

QSortFilterProxyModel

。相反，我坚持使用基本的Qt信号

在这里，我使用的是PyQt，但代码也应该在C++中工作：

self.model = QStandardItemModel()
self.populate_model()
self.model.setHorizontalHeaderLabels(map(str, range(self.model.rowCount())))
self.treeview.setModel(self.model)
self.treeview.header().setSectionsClickable(True)
self.treeview.header().setSortIndicatorShown(True)
self.treeview.header().sortIndicatorChanged.connect(self.model.sort)

---

请注意，最后一行连接了

QHeaderView:：sortinindicator

和

QStandardItemModel:：sort

您甚至可以说，不管您如何排序模型，视图可能会选择以另一种方式显示它。这就是为什么您需要使用

QSortFilterProxyModel

。我也使用过QSortFilterProxyModel，但我的模型是根据Car2goVehicle:：NameRole而不是Car2goVehicle:：DistanceRoleTermirlan:您是否将列与角色混淆了？我在上面的代码片段中添加了一段。