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# Notifier Class Reference
(Phonon::BackendCapabilities::Notifier)
[Phonon module]

     #include <Phonon>

Inherits QObject and QObject.

This class was introduced in Qt 4.4.

- List of all members, including inherited members

### Signals

- void availableAudioOutputDevicesChanged ()
- void capabilitiesChanged ()

- 2 signals inherited from QObject

### Additional Inherited Members

- 2 properties inherited from QObject
- 58 public functions inherited from QObject
- 2 public slots inherited from QObject
- 10 static public members inherited from QObject
- 14 protected functions inherited from QObject

## Detailed Description

Notifications about backend capabilities.

## Member Function Documentation

### void Notifier::availableAudioOutputDevicesChanged () `[signal]`

This signal is emitted when audio output devices were plugged or unplugged.

Check BackendCapabilities::availableAudioOutputDevices to get the current list of available devices.

### void Notifier::capabilitiesChanged () `[signal]`

This signal is emitted if the capabilities have changed. This can happen if the user has requested a backend change.