Qt Documentation

Contents

QQmlNdefRecord Class

The QQmlNdefRecord class implements the NdefRecord type in QML. More...

Header: #include <QQmlNdefRecord>
qmake: QT += nfc
Since: Qt 5.2
Instantiated By: NdefRecord
Inherits: QObject

Public Types

enum TypeNameFormat { Empty, NfcRtd, Mime, Uri, ExternalRtd, Unknown }

Properties

  • 1 property inherited from QObject

Public Functions

QQmlNdefRecord(QObject *parent = nullptr)
QQmlNdefRecord(const QNdefRecord &record, QObject *parent = nullptr)
virtual ~QQmlNdefRecord()
QNdefRecord record() const
void setRecord(const QNdefRecord &record)
void setType(const QString &newtype)
void setTypeNameFormat(QQmlNdefRecord::TypeNameFormat newTypeNameFormat)
QString type() const
QQmlNdefRecord::TypeNameFormat typeNameFormat() const
  • 31 public functions inherited from QObject

Signals

void recordChanged()
void typeChanged()
void typeNameFormatChanged()

Static Public Members

const QMetaObject staticMetaObject
  • 9 static public members inherited from QObject

Macros

Q_DECLARE_NDEFRECORD(className, typeNameFormat, type)

Additional Inherited Members

  • 1 public slot inherited from QObject
  • 9 protected functions inherited from QObject

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");

See also NdefRecord.

Member Type Documentation

enum QQmlNdefRecord::TypeNameFormat

This enum describes the type name format of an NDEF record. The values of this enum are according to QNdefRecord::TypeNameFormat

ConstantValueDescription
QQmlNdefRecord::EmptyQNdefRecord::EmptyAn empty NDEF record, the record does not contain a payload.
QQmlNdefRecord::NfcRtdQNdefRecord::NfcRtdThe NDEF record type is defined by an NFC RTD Specification.
QQmlNdefRecord::MimeQNdefRecord::MimeThe NDEF record type follows the construct described in RFC 2046.
QQmlNdefRecord::UriQNdefRecord::UriThe NDEF record type follows the construct described in RFC 3986.
QQmlNdefRecord::ExternalRtdQNdefRecord::ExternalRtdThe NDEF record type follows the construct for external type names described the NFC RTD Specification.
QQmlNdefRecord::UnknownQNdefRecord::UnknownThe NDEF record type is unknown.

Property Documentation

record : QNdefRecord

This property hold the NDEF record that this class represents.

Access functions:

QNdefRecord record() const
void setRecord(const QNdefRecord &record)

Notifier signal:

void recordChanged()

type : QString

This property hold the type of the NDEF record.

Access functions:

QString type() const
void setType(const QString &newtype)

Notifier signal:

void typeChanged()

typeNameFormat : TypeNameFormat

This property hold the TNF of the NDEF record.

Access functions:

QQmlNdefRecord::TypeNameFormat typeNameFormat() const
void setTypeNameFormat(QQmlNdefRecord::TypeNameFormat newTypeNameFormat)

Notifier signal:

void typeNameFormatChanged()

Member Function Documentation

QQmlNdefRecord::QQmlNdefRecord(QObject *parent = nullptr)

Constructs a new empty QQmlNdefRecord with parent.

QQmlNdefRecord::QQmlNdefRecord(const QNdefRecord &record, QObject *parent = nullptr)

Constructs a new QQmlNdefRecord representing record. The parent of the newly constructed object will be set to parent.

[virtual] QQmlNdefRecord::~QQmlNdefRecord()

Destroys the QQmlNdefRecord instance.

QNdefRecord QQmlNdefRecord::record() const

Returns a copy of the record.

Note: Getter function for property record.

See also setRecord().

void QQmlNdefRecord::setRecord(const QNdefRecord &record)

Sets the record to record. If the record is set the recordChanged() signal will be emitted.

Note: Setter function for property record.

See also record().

void QQmlNdefRecord::setType(const QString &newtype)

Sets the record type to newtype if it is not currently equal to type(); otherwise does nothing. If the record type is set the typeChanged() signal will be emitted.

Note: Setter function for property type.

See also QNdefRecord::setType() and QNdefRecord::type().

void QQmlNdefRecord::setTypeNameFormat(QQmlNdefRecord::TypeNameFormat newTypeNameFormat)

Sets the type name format of the NDEF record to newTypeNameFormat.

Note: Setter function for property typeNameFormat.

See also typeNameFormat().

QString QQmlNdefRecord::type() const

Returns the type of the record.

Note: Getter function for property type.

See also QNdefRecord::setType() and QNdefRecord::type().

[signal] void QQmlNdefRecord::typeChanged()

This signal is emitted when the record type changes.

Note: Notifier signal for property type.

QQmlNdefRecord::TypeNameFormat QQmlNdefRecord::typeNameFormat() const

Returns the type name format of the NDEF record.

Note: Getter function for property typeNameFormat.

See also setTypeNameFormat().

Macro Documentation

Q_DECLARE_NDEFRECORD(className, typeNameFormat, type)

This macro ensures that className is declared as the class implementing the NDEF record identified by typeNameFormat and type.

This macro should be expanded in the implementation file for className.

© 2021 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.