[App A] Refactoring for simplicity. Replacing the tiny ActionListeners with... (e1689253) · Commits · examples / Head First Java 3rd Edition

src/main/java/appA/BeatBoxFinal.java

+19 −41

Changes for src/main/java/appA/BeatBoxFinal.java: 19 added lines, 41 removed lines.
Original line number	Diff line number	Diff line
		@@ -82,19 +82,19 @@ public class BeatBoxFinal {

		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(1.03));
		buttonBox.add(upTempo);

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

		JButton sendIt = new JButton("sendIt");
		@@ -169,7 +169,7 @@ public class BeatBoxFinal {
		}
		makeTracks(instrument, beatsForInstrument);
		}
		track.add(makeEvent(ShortMessage.PROGRAM_CHANGE, 9, 1, 0, 15)); // - so we always go to full 16 beats
		track.add(makeEvent(ShortMessage.PROGRAM_CHANGE, 1, 0, 15)); // - so we always go to full 16 beats
		try {
		sequencer.setSequence(sequence);
		sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);
		@@ -180,32 +180,6 @@ public class BeatBoxFinal {
		}
		}

		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 class MySendListener implements ActionListener {
		public void actionPerformed(ActionEvent a) {
		// make an array of just the STATE of the checkboxes
		@@ -221,7 +195,7 @@ public class BeatBoxFinal {
		out.writeObject(userName + nextNum++ + ": " + userMessage.getText());
		out.writeObject(checkboxState);
		} catch (IOException ex) {
		System.out.println("Sorry dude. Could not send it to the server.");
		System.out.println("Terribly sorry. Could not send it to the server.");
		ex.printStackTrace();
		}
		userMessage.setText("");
		@@ -264,7 +238,7 @@ public class BeatBoxFinal {
		}
		}

		public void changeSequence(boolean[] newCheckboxStates) {
		private void changeSequence(boolean[] newCheckboxStates) {
		int i = 0;
		for (List<JCheckBox> checkboxesForInstrument : instrumentCheckboxes.values()) {
		for (JCheckBox checkbox : checkboxesForInstrument) {
		@@ -273,21 +247,25 @@ public class BeatBoxFinal {
		}
		}

		public void makeTracks(BeatInstrument instrument, List<Integer> beatsForInstrument) {
		private void makeTracks(BeatInstrument instrument, List<Integer> beatsForInstrument) {
		for (Integer beatNumber : beatsForInstrument) {
		track.add(makeEvent(ShortMessage.NOTE_ON, 9, instrument.getMidiValue(), 100, beatNumber));
		track.add(makeEvent(ShortMessage.NOTE_OFF, 9, instrument.getMidiValue(), 100, beatNumber + 1));
		track.add(makeEvent(ShortMessage.NOTE_ON, instrument.getMidiValue(), 100, beatNumber));
		track.add(makeEvent(ShortMessage.NOTE_OFF, instrument.getMidiValue(), 100, beatNumber + 1));
		}
		}

		public MidiEvent makeEvent(int command, int channel, int one, int two, int tick) {
		MidiEvent event = null;
		private MidiEvent makeEvent(int command, int one, int two, int tick) {
		try {
		ShortMessage midiMessage = new ShortMessage(command, channel, one, two);
		event = new MidiEvent(midiMessage, tick);
		ShortMessage midiMessage = new ShortMessage(command, 9, one, two);
		return new MidiEvent(midiMessage, tick);
		} catch (InvalidMidiDataException ignored) {
		return null;
		}
		}
		return event;

		private void changeTempo(double tempoMultiplier) {
		float tempoFactor = sequencer.getTempoFactor();
		sequencer.setTempoFactor((float) (tempoFactor * tempoMultiplier));
		}

		private static class BeatInstrument implements Comparable<BeatInstrument> {