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 QtMultimedia::MetaData 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.
Member Function Documentation
QMetaDataWriterControl::QMetaDataWriterControl(QObject * parent = 0) [protected]
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.
QStringList QMetaDataWriterControl::availableMetaData() const [pure virtual]
Returns a list of keys there is meta-data available for.
bool QMetaDataWriterControl::isMetaDataAvailable() const [pure virtual]
Identifies if meta-data is available from a media service.
Returns true if the meta-data is available and false otherwise.
bool QMetaDataWriterControl::isWritable() const [pure virtual]
Identifies if a media service's meta-data can be edited.
Returns true if the meta-data is writable and false otherwise.
QVariant QMetaDataWriterControl::metaData(const QString & key) const [pure virtual]
Returns the meta-data for the given key.
See also setMetaData().
void QMetaDataWriterControl::metaDataAvailableChanged(bool available) [signal]
Signal the availability of meta-data has changed, available will be true if the multimedia object has meta-data.
void QMetaDataWriterControl::metaDataChanged() [signal]
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]
Signal the changes of one meta-data element value with the given key.
void QMetaDataWriterControl::setMetaData(const QString & key, const QVariant & value) [pure virtual]
Sets the value of the meta-data element with the given key.
See also metaData().
void QMetaDataWriterControl::writableChanged(bool writable) [signal]
Signal a change in the writable status of meta-data, writable will be true if meta-data elements can be added or adjusted.
