Module java.desktop
Package javax.sound.midi

# Interface ControllerEventListener

All Superinterfaces:
  `EventListener`

public interface ControllerEventListener extends EventListener
The `ControllerEventListener` interface should be implemented by classes whose instances need to be notified when a `Sequencer` has processed a requested type of MIDI control-change event. To register a `ControllerEventListener` object to receive such notifications, invoke the `addControllerEventListener` method of `Sequencer`, specifying the types of MIDI controllers about which you are interested in getting control-change notifications.

See Also:
  - `MidiChannel.controlChange(int, int)`

## Method Summary

Modifier and Type
Method
Description
`void`
`controlChange(ShortMessage event)`
Invoked when a `Sequencer` has encountered and processed a control-change event of interest to this listener.

## Method Details

### controlChange

void controlChange(ShortMessage event)
Invoked when a `Sequencer` has encountered and processed a control-change event of interest to this listener. The event passed in is a `ShortMessage` whose first data byte indicates the controller number and whose second data byte is the value to which the controller was set.

Parameters:
  `event` - the control-change event that the sequencer encountered in the sequence it is processing
See Also:
  - `Sequencer.addControllerEventListener(ControllerEventListener, int[])`
  - `MidiChannel.controlChange(int, int)`
  - `ShortMessage.getData1()`
  - `ShortMessage.getData2()`