QMetaDataWriterControl Class▲
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Header: QMetaDataWriterControl
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qmake: QT += multimedia
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Inherits: QMediaControl
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Inherited By:
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Group: QMetaDataWriterControl is part of multimedia_control
Detailed Description▲
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▲
See also QMediaService::requestControl(), QMediaObject
Member Function Documentation▲
[explicit protected] QMetaDataWriterControl::QMetaDataWriterControl(QObject *parent = nullptr)▲
Construct a QMetaDataWriterControl with parent. This class is meant as a base class for service specific meta data providers so this constructor is protected.
[virtual] 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▲
void QMetaDataWriterControl::metaDataAvailableChanged(bool available)▲
Signal the availability of meta-data has changed, available will be true if the multimedia object has meta-data.
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.
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)▲
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.