在 QML PathView 中设置根索引

问题描述

我正在使用 QML PathView 来显示我的模型.这样的模型继承自 QStandardItemModel 并具有两个级别的数据(父项和子项).我需要在 PathView 中显示模型的第二级，即选定父级的所有子级.使用 QAbstractItemView 这个结果可以通过使用来实现setRootIndex 函数.如何使用 PathView 获得相同的结果?

I'm using a QML PathView to show my model. Such a model inherits from QStandardItemModel and has two levels of data (parent items and child items). I need to show the second level of the model in the PathView, i.e. all the children of a selected parent. Using a QAbstractItemView this result can be achieve by using the setRootIndex function. How can I achieve the same result with a PathView?

有人可以帮我吗?提前致谢.

Can someone help me? Thanks in advance.

这是一个模型示例:

newPetModel::newPetModel()
{
...
 fillModel();
}
...
void newPetModel::fillModel()
{
 QStandardItem* rootItem = invisibleRootItem();
 // groups
 QStandardItem* GroupAnimals = new QStandardItem();
 rootItem->setChild(rootItem->rowCount(), GroupAnimals);
 GroupAnimals->setData(QString("Animals"),nameRole);

 QStandardItem* GroupPlants = new QStandardItem();
 rootItem->setChild(rootItem->rowCount(), GroupPlants);
 GroupPlants->setData(QString("Plants"),nameRole);

 QStandardItem* GroupInsects = new QStandardItem();
 rootItem->setChild(rootItem->rowCount(), GroupInsects);
 GroupInsects->setData(QString("Insects"),nameRole);
 // items
 QStandardItem* Cat = new QStandardItem();
 GroupAnimals->setChild(GroupAnimals->rowCount(), Cat);
 Cat->setData(QString("Cat"),nameRole);
 Cat->setData(QString("qrc:/cat.jpg"),imgRole);

 QStandardItem* Dog = new QStandardItem();
 GroupAnimals->setChild(GroupAnimals->rowCount(), Dog);
 Dog->setData(QString("Dog"),nameRole);
 Dog->setData("qrc:/dog.jpg",imgRole);`enter code here`
 //-----
 QStandardItem* Peas = new QStandardItem();
 GroupPlants->setChild(GroupPlants->rowCount(), Peas);
 Peas->setData(QString("Peas"),nameRole);
 Peas->setData("qrc:/peas.jpg",imgRole);
 //-----
 QStandardItem* Spider = new QStandardItem();
 GroupInsects->setChild(GroupInsects->rowCount(), Spider);
 Spider->setData(QString("Spider"),nameRole);
 Spider->setData("qrc:/peas.jpg",imgRole);

 QStandardItem* Fly = new QStandardItem();
 GroupInsects->setChild(GroupInsects->rowCount(), Fly);
 Fly->setData(QString("Fly"),nameRole);
 Fly->setData("qrc:/fly.jpg",imgRole);
}

推荐答案

QML 适用于列表模型，正如您在您的案例中所见.但是，使用 DelegateModel.引用文档:

Qt/QtXXX/Examples/Qt-5.4/quick/views