Java How to Program Fourth Edition - DCC

Chapter 22 Java Media Framework and Java Sound (on CD) 1301
53
54 // constructor for MidiDemo
55 public MidiDemo()
56 {
57 super( "MIDI Demo" );
58
59 container = getContentPane();
60 container.setLayout( new BorderLayout() );
61
62 // synthesizer must be instantiated to enable synthesis
63 midiSynthesizer = new MidiSynthesizer();
64
65 // make piano keys
66 makeKeys();
67
68 // add control panel to frame
69 controlPanel = new JPanel( new BorderLayout() );
70 container.add( controlPanel, BorderLayout.NORTH );
71
72 makeConfigureControls();
73
74 // add button panel to frame
75 buttonPanel = new JPanel( new GridLayout( 5, 1 ) );
76 controlPanel.add( buttonPanel, BorderLayout.EAST );
77
78 // make GUI
79 makePlaySaveButtons();
80 makeRecordButton();
81 makePianoPlayerButton();
82
83 } // end constructor
84
85 // utility method making piano keys
86 private void makeKeys()
87 {
88 // panel containing keys
89 JPanel keyPanel = new JPanel( null );
90 container.add( keyPanel, BorderLayout.CENTER );
91
92 // piano keys
93 noteButton = new JButton[ MAX_KEYS ];
94
95 // add MAX_KEYS buttons and what note they sound
96 for ( int i = 0; i < MAX_KEYS; i++ ) {
97
98 final int note = i;
99
100 noteButton[ i ] = new JButton();
101
102 // setting white keys
103 noteButton[ i ].setBackground( Color.white );
104
Fig. Fig. 22.10 22.10 22.10 MidiDemo provides the GUI than enables users to interact with the
application (part 2 of 14).