我有一个 QStandardItemModel 类型的模型,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);
现在我想像这样根据距离排序
d->m_vehiclesmodel->setSortRole(Qt::UserRole);
d->m_vehiclesmodel->sort(Car2goVehicle::DistanceRole, Qt::AscendingOrder);
但结果是错误的。有人可以告诉我如何排序吗?
Thanks.
结果有什么问题吗?
在大多数情况下,人们不会对模型本身进行排序,而是对视图进行排序,使用QSortFilterProxy模型 http://doc.trolltech.com/latest/qsortfilterproxymodel.html。这是文档中的示例:
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 Role 枚举应如下所示:
enum Role {
NameRole=Qt::UserRole,
DistanceRole,
...
};
如果你想按距离角色排序,你可以调用:
model->setSortRole( Car2goVehicle::DistanceRole );
然后,按某个列排序(与角色无关),例如第 0 列:
model->sort( 0, Qt::AscendingOrder );
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