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/*
* Copyright 2012 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.swing;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.HashSet;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* Support for playing musical scales on the ASCII keyboard of a computer. Has a Sustain checkbox
* that simulates a sustain pedal. Auto-repeat keys are detected and suppressed.
*
* @author Phil Burk (C) 2012 Mobileer Inc
*/
@SuppressWarnings("serial")
public abstract class ASCIIMusicKeyboard extends JPanel {
private JCheckBox sustainBox;
private JButton focusButton;
public static final String PENTATONIC_KEYS = "zxcvbasdfgqwert12345";
public static final String SEPTATONIC_KEYS = "zxcvbnmasdfghjqwertyu1234567890";
private String keyboardLayout = SEPTATONIC_KEYS; /* default music keyboard layout */
private int basePitch = 48;
private KeyListener keyListener;
private JLabel countLabel;
private int onCount;
private int offCount;
private int pressedCount;
private int releasedCount;
private HashSet<Integer> pressedKeys = new HashSet<Integer>();
private HashSet<Integer> onKeys = new HashSet<Integer>();
public ASCIIMusicKeyboard() {
focusButton = new JButton("Click here to play ASCII keys.");
focusButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
}
});
keyListener = new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyChar();
int idx = keyboardLayout.indexOf(key);
System.out.println("keyPressed " + idx);
if (idx >= 0) {
if (!pressedKeys.contains(idx)) {
keyOn(convertIndexToPitch(idx));
onCount++;
pressedKeys.add(idx);
onKeys.add(idx);
}
}
pressedCount++;
updateCountLabel();
}
@Override
public void keyReleased(KeyEvent e) {
int key = e.getKeyChar();
int idx = keyboardLayout.indexOf(key);
System.out.println("keyReleased " + idx);
if (idx >= 0) {
if (!sustainBox.isSelected()) {
noteOffInternal(idx);
onKeys.remove(idx);
}
pressedKeys.remove(idx);
}
releasedCount++;
updateCountLabel();
}
@Override
public void keyTyped(KeyEvent arg0) {
}
};
focusButton.addKeyListener(keyListener);
add(focusButton);
sustainBox = new JCheckBox("sustain");
sustainBox.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if (!sustainBox.isSelected()) {
for (Integer noteIndex : onKeys) {
noteOffInternal(noteIndex);
}
onKeys.clear();
}
}
});
add(sustainBox);
sustainBox.addKeyListener(keyListener);
countLabel = new JLabel("0");
add(countLabel);
}
private void noteOffInternal(int idx) {
keyOff(convertIndexToPitch(idx));
offCount++;
}
protected void updateCountLabel() {
countLabel.setText(onCount + "/" + offCount + ", " + pressedCount + "/" + releasedCount);
}
/**
* Convert index to a MIDI noteNumber in a major scale. Result will be offset by the basePitch.
*/
public int convertIndexToPitch(int keyIndex) {
int scale[] = {
0, 2, 4, 5, 7, 9, 11
};
int octave = keyIndex / scale.length;
int idx = keyIndex % scale.length;
int pitch = (octave * 12) + scale[idx];
return pitch + basePitch;
}
/**
* This will be called when a key is released. It may also be called for sustaining notes when
* the Sustain check box is turned off.
*
* @param pitch
*/
public abstract void keyOff(int keyIndex);
/**
* This will be called when a key is pressed.
*
* @param pitch
*/
public abstract void keyOn(int keyIndex);
public String getKeyboardLayout() {
return keyboardLayout;
}
/**
* Specify the keys that will be active for music. If the first character in the layout is
* pressed then keyOn() will be called with 0. Default is SEPTATONIC_KEYS.
*
* @param keyboardLayout defines order of playable keys
*/
public void setKeyboardLayout(String keyboardLayout) {
this.keyboardLayout = keyboardLayout;
}
public int getBasePitch() {
return basePitch;
}
/**
* Define offset used by convertIndexToPitch().
*
* @param basePitch
*/
public void setBasePitch(int basePitch) {
this.basePitch = basePitch;
}
/**
* @return
*/
public KeyListener getKeyListener() {
return keyListener;
}
}
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