CODEWITHSUNDEEP
c++qmlqt5qlistviewqlist
rbtLong
rbtLong

Reputation: 1572

Binding QList<Type*> to QListView

I have a custom type, called Patients (please ignore the plural mistake). I want to create a QList<Patients*> in my cpp and consume that from my QML. I am following the patterns from here, but it is not working.

Here is my patients.h (probably more info than needed) . . .

class Patients : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString name READ getName)
    Q_PROPERTY(QString email READ getEmail)
    Q_PROPERTY(int id READ getId)

public:
    explicit Patients(QObject *parent = 0);
    explicit Patients(int id, QString name, QString email, QObject *parent = 0);

    QString getName() const;
    QString getEmail() const;
    int getId() const;

private:
    QString email, name;
    int id;
};

Here is the main cpp

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QQmlApplicationEngine engine;

    QList<Patients*> lst;
    lst.append(new Patients(0, QString("abe"), QString("albert")));
    QQmlContext *ctx = engine.rootContext();
    ctx->setContextProperty("pLst", QVariant::fromValue(lst));

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    return app.exec();
}

Here is the qml . . . 

ListView{
    id: lst
    height: 100; width: 100
    anchors.fill: parent
    x: 100; y: 100

    model: pLst
    delegate: Text{
        text: model.modelData.name
    }
}

It works when I bind a single object, but not as a list. Even presenting the index inside Text does not work. No error messages or anything.

Upvotes: 0

Views: 1435

Answers (3)

APRocha
APRocha

Reputation: 378

You will define new class with QQmlListProperty, and define a container data object(this class will inherit from QObject), in the class of QQmlListProperty you will define the container QList of pointers of QObject. I wrote two posts about this topic:

Show, change data and keep QQmlListProperty in qml

Use QQmlListProperty to show and modify QList in Qml

Upvotes: 0

rbtLong
rbtLong

Reputation: 1572

It turns out I must declare the list as 

QList<QObject*> lst;

Upvotes: 0

Lutz Sch&#246;nemann
Lutz Sch&#246;nemann

Reputation: 1139

There is no general support for the QList container in QML even if the type it is holding is registered to Qt's meta system. Some special variants (e.g. QStringList QList<QObject*>) are supported by default so you can use QList<QObject*> if your class is derived from QObject.

If your type is not derived from QObject or if you want to keep your interface in C++ clean and typesafe I suggest to use QQmlListProperty. Mind that you don't have to implement the append() or clear() method if you do not want to make the list modifiable from inside QML.

Upvotes: 3

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