内容

• 公共类型
• 特性
• 公共函数
• 信号
• 静态公共成员
• 宏
• 详细描述

QQmlNdefRecord Class

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

头：	#include <QQmlNdefRecord>
qmake:	QT += nfc
Since:	Qt 5.2
实例化：	NdefRecord
继承：	QObject

• 所有成员列表，包括继承成员
• 过时成员

公共类型

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

特性

• record : QNdefRecord
• type : QString
• typeNameFormat : TypeNameFormat

• 1 特性继承自 QObject

公共函数

	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 公共函数继承自 QObject

信号

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

• 2 信号继承自 QObject

静态公共成员

const QMetaObject

staticMetaObject

• 9 静态公共成员继承自 QObject

宏

Q_DECLARE_NDEFRECORD ( className , typeNameFormat , type )

额外继承成员

• 1 公共槽继承自 QObject
• 9 保护函数继承自 QObject

详细描述

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 和 QObject 指针。
• 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");
					

另请参阅 NdefRecord .

成员类型文档编制

enum QQmlNdefRecord:: TypeNameFormat

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

常量	值	描述
QQmlNdefRecord::Empty	QNdefRecord::Empty	An empty NDEF record, the record does not contain a payload.
QQmlNdefRecord::NfcRtd	QNdefRecord::NfcRtd	The NDEF record type is defined by an NFC RTD Specification.
QQmlNdefRecord::Mime	QNdefRecord::Mime	The NDEF record type follows the construct described in RFC 2046.
QQmlNdefRecord::Uri	QNdefRecord::Uri	The NDEF record type follows the construct described in RFC 3986.
QQmlNdefRecord::ExternalRtd	QNdefRecord::ExternalRtd	The NDEF record type follows the construct for external type names described the NFC RTD Specification.
QQmlNdefRecord::Unknown	QNdefRecord::Unknown	The NDEF record type is unknown.

特性文档编制

record : QNdefRecord

This property hold the NDEF record that this class represents.

访问函数：

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

通知程序信号：

void	recordChanged ()

type : QString

This property hold the type of the NDEF record.

访问函数：

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

通知程序信号：

void	typeChanged ()

typeNameFormat : TypeNameFormat

This property hold the TNF of the NDEF record.

访问函数：

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

通知程序信号：

void	typeNameFormatChanged ()

成员函数文档编制

QQmlNdefRecord:: QQmlNdefRecord ( QObject * parent = nullptr)

Constructs a new empty QQmlNdefRecord with parent .

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

构造新的 QQmlNdefRecord representing record . The parent of the newly constructed object will be set to parent .

[虚拟] QQmlNdefRecord:: ~QQmlNdefRecord ()

销毁 QQmlNdefRecord 实例。

QNdefRecord QQmlNdefRecord:: record () const

Returns a copy of the record.

注意： getter 函数对于特性 record .

另请参阅 setRecord ().

void QQmlNdefRecord:: setRecord (const QNdefRecord & record )

Sets the record to record . If the record is set the recordChanged () 信号会被发射。

注意： setter 函数对于特性 record .

另请参阅 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 () 信号会被发射。

注意： setter 函数对于特性 type .

另请参阅 QNdefRecord::setType () 和 QNdefRecord::type ().

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

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

注意： setter 函数对于特性 typeNameFormat .

另请参阅 typeNameFormat ().

QString QQmlNdefRecord:: type () const

Returns the type of the record.

注意： getter 函数对于特性 type .

另请参阅 QNdefRecord::setType () 和 QNdefRecord::type ().

[signal] void QQmlNdefRecord:: typeChanged ()

This signal is emitted when the record type changes.

注意： 通知程序信号对于特性 type .

QQmlNdefRecord::TypeNameFormat QQmlNdefRecord:: typeNameFormat () const

Returns the type name format of the NDEF record.

注意： getter 函数对于特性 typeNameFormat .

另请参阅 setTypeNameFormat ().

宏文档编制

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 .