Member Function Documentation

[protected] QMetaDataReaderControl::QMetaDataReaderControl(QObject *parent = nullptr)

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

[virtual] QMetaDataReaderControl::~QMetaDataReaderControl()

Destroy the meta-data object.

[pure virtual] QStringList QMetaDataReaderControl::availableMetaData() const

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

[pure virtual] bool QMetaDataReaderControl::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] QVariant QMetaDataReaderControl::metaData(const QString &key) const

Returns the meta-data for the given key.

[signal] void QMetaDataReaderControl::metaDataAvailableChanged(bool available)

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

[signal] void QMetaDataReaderControl::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.

Note: Signal metaDataChanged is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:

connect(metaDataReaderControl, QOverload<>::of(&QMetaDataReaderControl::metaDataChanged),
    [=](){ /* ... */ });

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

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

Note: Signal metaDataChanged is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:

connect(metaDataReaderControl, QOverload<const QString &, const QVariant &>::of(&QMetaDataReaderControl::metaDataChanged),
    [=](const QString &key, const QVariant &value){ /* ... */ });