1 /*
   2  * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javax.sound.midi;
  27 
  28 import java.util.EventListener;
  29 
  30 /**
  31  * The {@code ControllerEventListener} interface should be implemented by
  32  * classes whose instances need to be notified when a {@link Sequencer} has
  33  * processed a requested type of MIDI control-change event. To register a
  34  * {@code ControllerEventListener} object to receive such notifications, invoke
  35  * the
  36  * {@link Sequencer#addControllerEventListener(ControllerEventListener, int[])
  37  * addControllerEventListener} method of {@code Sequencer}, specifying the types
  38  * of MIDI controllers about which you are interested in getting control-change
  39  * notifications.
  40  *
  41  * @author Kara Kytle
  42  * @see MidiChannel#controlChange(int, int)
  43  */
  44 public interface ControllerEventListener extends EventListener {
  45 
  46     /**
  47      * Invoked when a {@link Sequencer} has encountered and processed a
  48      * control-change event of interest to this listener. The event passed in is
  49      * a {@code ShortMessage} whose first data byte indicates the controller
  50      * number and whose second data byte is the value to which the controller
  51      * was set.
  52      *
  53      * @param  event the control-change event that the sequencer encountered in
  54      *         the sequence it is processing
  55      * @see Sequencer#addControllerEventListener(ControllerEventListener, int[])
  56      * @see MidiChannel#controlChange(int, int)
  57      * @see ShortMessage#getData1
  58      * @see ShortMessage#getData2
  59      */
  60     void controlChange(ShortMessage event);
  61 }