[Ch15] BeatBox with lambda expressions (5377bc65) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch15/BeatBox.java

+21 −48

Changes for src/main/java/ch15/BeatBox.java: 21 added lines, 48 removed lines.
Original line number	Diff line number	Diff line
		@@ -3,7 +3,6 @@ package ch15;
		import javax.sound.midi.*;
		import javax.swing.*;
		import java.awt.*;
		import java.awt.event.*;
		import java.util.ArrayList;

		import static javax.sound.midi.ShortMessage.*;
		@@ -22,14 +21,13 @@ public class BeatBox {
		"Open Hi Conga"};
		int[] instruments = {35, 42, 46, 38, 49, 39, 50, 60, 70, 72, 64, 56, 58, 47, 67, 63};


		public static void main(String[] args) {
		new BeatBox().buildGUI();
		}

		public void buildGUI() {
		JFrame theFrame = new JFrame("Cyber BeatBox");
		theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		JFrame frame = new JFrame("Cyber BeatBox");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		BorderLayout layout = new BorderLayout();
		JPanel background = new JPanel(layout);
		background.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
		@@ -38,19 +36,19 @@ public class BeatBox {
		Box buttonBox = new Box(BoxLayout.Y_AXIS);

		JButton start = new JButton("Start");
		start.addActionListener(new MyStartListener());
		start.addActionListener(e -> buildTrackAndStart());
		buttonBox.add(start);

		JButton stop = new JButton("Stop");
		stop.addActionListener(new MyStopListener());
		stop.addActionListener(e -> sequencer.stop());
		buttonBox.add(stop);

		JButton upTempo = new JButton("Tempo Up");
		upTempo.addActionListener(new MyUpTempoListener());
		upTempo.addActionListener(e -> changeTempo(1.03f));
		buttonBox.add(upTempo);

		JButton downTempo = new JButton("Tempo Down");
		downTempo.addActionListener(new MyDownTempoListener());
		downTempo.addActionListener(e -> changeTempo(0.97f));
		buttonBox.add(downTempo);

		Box nameBox = new Box(BoxLayout.Y_AXIS);
		@@ -63,7 +61,7 @@ public class BeatBox {
		background.add(BorderLayout.EAST, buttonBox);
		background.add(BorderLayout.WEST, nameBox);

		theFrame.getContentPane().add(background);
		frame.getContentPane().add(background);

		GridLayout grid = new GridLayout(16, 16);
		grid.setVgap(1);
		@@ -81,12 +79,11 @@ public class BeatBox {

		setUpMidi();

		theFrame.setBounds(50, 50, 300, 300);
		theFrame.pack();
		theFrame.setVisible(true);
		frame.setBounds(50, 50, 300, 300);
		frame.pack();
		frame.setVisible(true);
		}


		public void setUpMidi() {
		try {
		sequencer = MidiSystem.getSequencer();
		@@ -98,7 +95,7 @@ public class BeatBox {
		} catch (Exception e) {
		e.printStackTrace();
		}
		} // close method
		}

		public void buildTrackAndStart() {
		int[] trackList;
		@@ -123,7 +120,6 @@ public class BeatBox {

		track.add(makeEvent(192, 9, 1, 0, 15));
		try {

		sequencer.setSequence(sequence);
		sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);
		sequencer.start();
		@@ -133,34 +129,7 @@ public class BeatBox {
		}
		}

		public class MyStartListener implements ActionListener {
		public void actionPerformed(ActionEvent a) {
		buildTrackAndStart();
		}
		}

		public class MyStopListener implements ActionListener {
		public void actionPerformed(ActionEvent a) {
		sequencer.stop();
		}
		}

		public class MyUpTempoListener implements ActionListener {
		public void actionPerformed(ActionEvent a) {
		float tempoFactor = sequencer.getTempoFactor();
		sequencer.setTempoFactor((float) (tempoFactor * 1.03));
		}
		}

		public class MyDownTempoListener implements ActionListener {
		public void actionPerformed(ActionEvent a) {
		float tempoFactor = sequencer.getTempoFactor();
		sequencer.setTempoFactor((float) (tempoFactor * .97));
		}
		}

		public void makeTracks(int[] list) {

		private void makeTracks(int[] list) {
		for (int i = 0; i < 16; i++) {
		int key = list[i];

		@@ -171,13 +140,17 @@ public class BeatBox {
		}
		}

		public MidiEvent makeEvent(int comd, int chan, int one, int two, int tick) {
		private void changeTempo(float tempoMultiplier) {
		float tempoFactor = sequencer.getTempoFactor();
		sequencer.setTempoFactor(tempoFactor * tempoMultiplier);
		}

		public static MidiEvent makeEvent(int cmd, int chnl, int one, int two, int tick) {
		MidiEvent event = null;
		try {
		ShortMessage a = new ShortMessage();
		a.setMessage(comd, chan, one, two);
		event = new MidiEvent(a, tick);

		ShortMessage msg = new ShortMessage();
		msg.setMessage(cmd, chnl, one, two);
		event = new MidiEvent(msg, tick);
		} catch (Exception e) {
		e.printStackTrace();
		}