QMetaDataWriterControl Class

The QMetaDataWriterControl class provides write access to the meta-data of a QMediaService's media. More...

Header: #include <QMetaDataWriterControl>
qmake: QT += multimedia
Inherits: QMediaControl.

Public Functions

~QMetaDataWriterControl()
virtual QStringList availableMetaData() const = 0
virtual bool isMetaDataAvailable() const = 0
virtual bool isWritable() const = 0
virtual QVariant metaData(const QString & key) const = 0
virtual void setMetaData(const QString & key, const QVariant & value) = 0
  • 31 public functions inherited from QObject

Signals

void metaDataAvailableChanged(bool available)
void metaDataChanged()
void metaDataChanged(const QString & key, const QVariant & value)
void writableChanged(bool writable)

Protected Functions

QMetaDataWriterControl(QObject * parent = 0)
  • 9 protected functions inherited from QObject

Macros

Additional Inherited Members

  • 1 property inherited from QObject
  • 1 public slot inherited from QObject
  • 11 static public members inherited from QObject

Detailed Description

The QMetaDataWriterControl class provides write access to the meta-data of a QMediaService's media.

If a QMediaService can provide write access to the meta-data of its current media it will implement QMetaDataWriterControl. This control provides functions for both retrieving and setting meta-data values. Meta-data may be addressed by the keys defined in the QMediaMetaData namespace.

The functionality provided by this control is exposed to application code by the meta-data members of QMediaObject, and so meta-data access is potentially available in any of the media object classes. Any media service may implement QMetaDataControl.

The interface name of QMetaDataWriterControl is org.qt-project.qt.metadatawritercontrol/5.0 as defined in QMetaDataWriterControl_iid.

See also QMediaService::requestControl() and QMediaObject.

Member Function Documentation

[protected] QMetaDataWriterControl::​QMetaDataWriterControl(QObject * parent = 0)

Construct a QMetaDataWriterControl with parent. This class is meant as a base class for service specific meta data providers so this constructor is protected.

QMetaDataWriterControl::​~QMetaDataWriterControl()

Destroy the meta-data writer control.

[pure virtual] QStringList QMetaDataWriterControl::​availableMetaData() const

Returns a list of keys there is meta-data available for.

[pure virtual] bool QMetaDataWriterControl::​isMetaDataAvailable() const

Identifies if meta-data is available from a media service.

Returns true if the meta-data is available and false otherwise.

[pure virtual] bool QMetaDataWriterControl::​isWritable() const

Identifies if a media service's meta-data can be edited.

Returns true if the meta-data is writable and false otherwise.

[pure virtual] QVariant QMetaDataWriterControl::​metaData(const QString & key) const

Returns the meta-data for the given key.

See also setMetaData().

[signal] void QMetaDataWriterControl::​metaDataAvailableChanged(bool available)

Signal the availability of meta-data has changed, available will be true if the multimedia object has meta-data.

[signal] void QMetaDataWriterControl::​metaDataChanged()

Signal the changes of meta-data.

If multiple meta-data elements are changed, metaDataChanged(const QString &key, const QVariant &value) signal is emitted for each of them with metaDataChanged() changed emitted once.

[signal] void QMetaDataWriterControl::​metaDataChanged(const QString & key, const QVariant & value)

Signal the changes of one meta-data element value with the given key.

[pure virtual] void QMetaDataWriterControl::​setMetaData(const QString & key, const QVariant & value)

Sets the value of the meta-data element with the given key.

See also metaData().

[signal] void QMetaDataWriterControl::​writableChanged(bool writable)

Signal a change in the writable status of meta-data, writable will be true if meta-data elements can be added or adjusted.

Macro Documentation

QMetaDataWriterControl_iid

org.qt-project.qt.metadatawritercontrol/5.0

Defines the interface name of the QMetaDataWriterControl class.

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