Detailed Description

The QQmlNdefRecord class implements the NdefRecord type in QML.

The QQmlNdefRecord class is the base class for all NdefRecord types in QML. To support a new NDEF record type in QML subclass this class and expose new properties, member functions and signals appropriate for the new record type. The following must be done to create a new NDEF record type in QML:

• The subclass must have a Q_OBJECT macro in its declaration.
• The subclass must have an invokable constructor that takes a QNdefRecord and a QObject pointer.
• The subclass must be declared as an NDEF record by expanding the Q_DECLARE_NDEFRECORD() macro in the implementation file of the subclass.
• The subclass must be registered with QML.

For example the declaration of such a class may look like the following.

class QQmlNdefFooRecord : public QQmlNdefRecord
{
    Q_OBJECT

    Q_PROPERTY(int foo READ foo WRITE setFoo NOTIFY fooChanged)

public:
    explicit QQmlNdefFooRecord(QObject *parent = 0);
    Q_INVOKABLE QQmlNdefFooRecord(const QNdefRecord &record, QObject *parent = 0);
    ~QQmlNdefFooRecord();

    int foo() const;
    void setFoo(int value);

signals:
    void fooChanged();
};

Within the implementation file the Q_DECLARE_NDEFRECORD() macro is expanded:

Q_DECLARE_NDEFRECORD(QQmlNdefFooRecord, QNdefRecord::ExternalRtd, "com.example:f")

Finially the application or plugin code calls qmlRegisterType():

qmlRegisterType<QQmlNdefFooRecord>(uri, 1, 0, "NdefFooRecord");