[Ch15] Formatting BeatBox (29aa6ebb) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch15/BeatBox.java

+27 −34

Changes for src/main/java/ch15/BeatBox.java: 27 added lines, 34 removed lines.
Original line number	Diff line number	Diff line
		package ch15;

		import java.awt.*;
		import javax.swing.*;
		import javax.sound.midi.*;
		import java.util.*;
		import java.awt.event.*;
		import javax.swing.*;
		import java.awt.BorderLayout;
		import java.awt.GridLayout;
		import java.awt.Label;
		import java.awt.event.ActionEvent;
		import java.awt.event.ActionListener;
		import java.util.ArrayList;


		public class BeatBox {


		JPanel mainPanel;
		ArrayList<JCheckBox> checkboxList;
		Sequencer sequencer;
		@@ -76,14 +77,14 @@ public class BeatBox {
		c.setSelected(false);
		checkboxList.add(c);
		mainPanel.add(c);
		} // end loop
		}

		setUpMidi();

		theFrame.setBounds(50, 50, 300, 300);
		theFrame.pack();
		theFrame.setVisible(true);
		} // close method
		}


		public void setUpMidi() {
		@@ -94,38 +95,31 @@ public class BeatBox {
		track = sequence.createTrack();
		sequencer.setTempoInBPM(120);

		} catch(Exception e) {e.printStackTrace();}
		} catch (Exception e) {
		e.printStackTrace();
		}
		} // close method

		public void buildTrackAndStart() {
		int[] trackList = null;
		int[] trackList;

		sequence.deleteTrack(track);
		track = sequence.createTrack();


		for (int i = 0; i < 16; i++) {
		trackList = new int[16];


		int key = instruments[i];


		for (int j = 0; j < 16; j++) {

		JCheckBox jc = checkboxList.get(j + 16 * i);
		if (jc.isSelected()) {
		trackList[j] = key;
		} else {
		trackList[j] = 0;
		}
		} // close inner loop


		}
		makeTracks(trackList);
		track.add(makeEvent(176, 1, 127, 0, 16));
		} // close outer

		}

		track.add(makeEvent(192, 9, 1, 0, 15));
		try {
		@@ -134,39 +128,36 @@ public class BeatBox {
		sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);
		sequencer.start();
		sequencer.setTempoInBPM(120);
		} catch(Exception e) {e.printStackTrace();}
		} // close buildTrackAndStart method

		} catch (Exception e) {
		e.printStackTrace();
		}
		}

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

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

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

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




		}

		public void makeTracks(int[] list) {

		@@ -187,8 +178,10 @@ public class BeatBox {
		a.setMessage(comd, chan, one, two);
		event = new MidiEvent(a, tick);

		} catch(Exception e) {e.printStackTrace(); }
		} catch (Exception e) {
		e.printStackTrace();
		}
		return event;
		}

		} // close class
		}