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package javax.sound.midi;

import java.util.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. 
Author:
Kara Kytle
See Also:
MidiChannel.controlChange(int, int)/**
 * The {@code ControllerEventListener} interface should be implemented by
 * classes whose instances need to be notified when a {@link Sequencer} has
 * processed a requested type of MIDI control-change event. To register a
 * {@code ControllerEventListener} object to receive such notifications, invoke
 * the
 * {@link Sequencer#addControllerEventListener(ControllerEventListener, int[])
 * addControllerEventListener} method of {@code Sequencer}, specifying the types
 * of MIDI controllers about which you are interested in getting control-change
 * notifications.
 *
 * @author Kara Kytle
 * @see MidiChannel#controlChange(int, int)
 */
public interface ControllerEventListener extends EventListener {

    
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. 
Params:
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/**
     * Invoked when a {@link Sequencer} has encountered and processed a
     * control-change event of interest to this listener. The event passed in is
     * a {@code ShortMessage} whose first data byte indicates the controller
     * number and whose second data byte is the value to which the controller
     * was set.
     *
     * @param  event the control-change event that the sequencer encountered in
     *         the sequence it is processing
     * @see Sequencer#addControllerEventListener(ControllerEventListener, int[])
     * @see MidiChannel#controlChange(int, int)
     * @see ShortMessage#getData1
     * @see ShortMessage#getData2
     */
    void controlChange(ShortMessage event);
}