juke.java

用JAVA实现录音机功能

                g2.setFont(font24);
                g2.drawString(currentName, 5, fm28.getHeight()-5);
                if (duration <= 0.0) {
                    loading.render(d, g2);
                } else {
                    double seconds = getSeconds();
                    if (midiEOM || audioEOM) {
                        seconds = duration;
                    }
                    if (seconds > 0.0) {
                        g2.setFont(font42);
                        String s = String.valueOf(seconds);
                        s =  s.substring(0,s.indexOf('.')+2);
                        int strW = (int) fm42.getStringBounds(s, g2).getWidth();
                        g2.drawString(s, d.width-strW-9, fm42.getAscent());

                        int num = 30;
                        int progress = (int) (seconds / duration * num);
                        double ww = ((double) (d.width - 10) / (double) num);
                        double hh = (int) (d.height * 0.25);
                        double x = 0.0;
                        for ( ; x < progress; x+=1.0) {
                            g2.fill(new Rectangle2D.Double(x*ww+5, d.height-hh-5, ww-1, hh));
                        }
                        g2.setColor(jfcDarkBlue);
                        for ( ; x < num; x+=1.0) {
                            g2.fill(new Rectangle2D.Double(x*ww+5, d.height-hh-5, ww-1, hh));
                        }
                    }
                }
            }
        }
        
        public void start() {
            pbThread = new Thread(this);
            pbThread.setName("PlaybackMonitor");
            pbThread.start();
        }
        
        public void stop() {
            if (pbThread != null) {
                pbThread.interrupt();
            }
            pbThread = null;
        }
        
        public void run() {
            while (pbThread != null) {
                try {
                    pbThread.sleep(99);
                } catch (Exception e) { break; }
                repaint();
            }
            pbThread = null;
        }
    } // End PlaybackMonitor
            


    /**
     * Table to display the name of the sound.
     */
    class JukeTable extends JPanel implements ActionListener {

        TableModel dataModel;
        JFrame frame;
        JTextField textField;
        JButton applyB;

        public JukeTable() {
            setLayout(new BorderLayout());
            setPreferredSize(new Dimension(260,300));

            final String[] names = { "#", "Name" };
    
            dataModel = new AbstractTableModel() {
                public int getColumnCount() { return names.length; }
                public int getRowCount() { return sounds.size();}
                public Object getValueAt(int row, int col) { 
                    if (col == 0) {
                        return new Integer(row);
                    } else if (col == 1) {
                        Object object = sounds.get(row);
                        if (object instanceof File) {
                            return ((File) object).getName();
                        } else if (object instanceof URL) {
                            return ((URL) object).getFile();
                        }
                    } 
                    return null;
                }
                public String getColumnName(int col) {return names[col]; }
                public Class getColumnClass(int c) {
                    return getValueAt(0, c).getClass();
                }
                public boolean isCellEditable(int row, int col) {
                    return false;
                }
                public void setValueAt(Object aValue, int row, int col) {
                }
            };
    
            table = new JTable(dataModel);
            TableColumn col = table.getColumn("#");
            col.setMaxWidth(20);
            table.sizeColumnsToFit(0);
        
            JScrollPane scrollPane = new JScrollPane(table);
            EmptyBorder eb = new EmptyBorder(5,5,2,5);
            scrollPane.setBorder(new CompoundBorder(eb,new EtchedBorder()));
            add(scrollPane);

            JPanel p1 = new JPanel();
            JMenuBar menuBar = new JMenuBar();
            menuBar.setBorder(new BevelBorder(BevelBorder.RAISED));
            JMenu menu = (JMenu) menuBar.add(new JMenu("Add"));
            String items[] = { "File or Directory of Files", "URL" };
            for (int i = 0; i < items.length; i++) {
                JMenuItem item = menu.add(new JMenuItem(items[i]));
                item.addActionListener(this);
            } 
            p1.add(menuBar);

            menuBar = new JMenuBar();
            menuBar.setBorder(new BevelBorder(BevelBorder.RAISED));
            menu = (JMenu) menuBar.add(new JMenu("Remove"));
            JMenuItem item = menu.add(new JMenuItem("Selected"));
            item.addActionListener(this);
            item = menu.add(new JMenuItem("All"));
            item.addActionListener(this);
            p1.add(menuBar);

            loopB = addButton("loop", p1);
            loopB.setBackground(Color.gray);
            loopB.setSelected(true);

            add("South", p1);
        }

        
        private JButton addButton(String name, JPanel p) {
            JButton b = new JButton(name);
            b.addActionListener(this);
            p.add(b);
            return b;
        }

 
        private void doFrame(String titleName) {
            int w = 500;
            int h = 130;
            JPanel panel = new JPanel(new BorderLayout());
            JPanel p1 = new JPanel();
            if (titleName.endsWith("URL")) {
                p1.add(new JLabel("URL :"));
                textField = new JTextField("http://foo.bar.com/foo.wav");
                textField.addActionListener(this);
            } else {
                p1.add(new JLabel("File or Dir :"));
                String sep = String.valueOf(System.getProperty("file.separator").toCharArray()[0]);
                String text = null;
                try {
                    text = System.getProperty("user.dir") + sep;
                } catch (SecurityException ex) {
                    reportStatus(ex.toString());
                    JavaSound.showInfoDialog();
                    return;
                }
                textField = new JTextField(text);
                textField.setPreferredSize(new Dimension(w-100, 30));
                textField.addActionListener(this);
            }
            p1.add(textField);
            panel.add(p1);
            JPanel p2 = new JPanel();
            applyB = addButton("Apply", p2);
            addButton("Cancel", p2);
            panel.add("South", p2);
            frame = new JFrame(titleName);
            frame.getContentPane().add("Center", panel);
            frame.pack();
            Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
            frame.setLocation(d.width/2 - w/2, d.height/2 - h/2);
            frame.setSize(w, h);
            frame.setVisible(true);
        }


        public void actionPerformed(ActionEvent e) {
            Object object = e.getSource();
            if (object instanceof JTextField) {
                applyB.doClick();
            } else if (object instanceof JMenuItem) {
                JMenuItem mi = (JMenuItem) object;
                if (mi.getText().startsWith("File")) {
                    doFrame("Add File or Directory");
                } else if (mi.getText().equals("URL")) {
                    doFrame("Add URL");
                } else if (mi.getText().equals("Selected")) {
                    int rows[] = table.getSelectedRows();
                    Vector tmp = new Vector();
                    for (int i = 0; i < rows.length;i++) {
                        tmp.add(sounds.get(rows[i]));
                    }
                    sounds.removeAll(tmp);
                    tableChanged();
                } else if (mi.getText().equals("All")) {
                    sounds.clear();
                    tableChanged();
                }
            } else if (object instanceof JButton) {
                JButton button = (JButton) e.getSource();
                if (button.getText().equals("Apply")) {
                    String name = textField.getText().trim();
                    if (name.startsWith("http") || name.startsWith("file")) {
                        try {
                            sounds.add(new URL(name));
                        } catch (Exception ex) { ex.printStackTrace(); };
                    } else {
                        loadJuke(name);
                    }
                    tableChanged();
                } else if (button.getText().equals("Cancel")) {
                    frame.dispose();
                    frame = null;
                    errStr = null;
                    playbackMonitor.repaint();
                } else if (button.getText().equals("loop")) {
                    loopB.setSelected(!loopB.isSelected());
                    loopB.setBackground(loopB.isSelected() ? Color.gray : Color.lightGray);
                }
                startB.setEnabled(sounds.size() != 0);
            }
        }

        public void tableChanged() {
            table.tableChanged(new TableModelEvent(dataModel));
        }
    }  // End JukeTable



    /**
     * Animation thread for when an audio file loads.
     */
    class Loading extends Thread {

        double extent; int incr;

        public void run() {
            extent = 360.0; incr = 10;
            while (true) {
                try { sleep(99); } catch (Exception ex) { break; }
                playbackMonitor.repaint();
            }
        }

        public void render(Dimension d, Graphics2D g2) { 
            if (isAlive()) {
                FontRenderContext frc = g2.getFontRenderContext();
                TextLayout tl = new TextLayout("Loading", g2.getFont(), frc);
                float sw = (float) tl.getBounds().getWidth();
                tl.draw(g2, d.width-sw-45, d.height-10);
                double x = d.width-33, y = d.height-30, ew = 25, eh = 25;
                g2.draw(new Ellipse2D.Double(x,y,ew,eh));
                g2.fill(new Arc2D.Double(x,y,ew,eh,90,extent,Arc2D.PIE));
                if ((extent -= incr) < 0) {
                    extent = 350.0;
                }
            }
        }
    }

            

    /**
     * Animation thread for the contributors of Java Sound.
     */
    class Credits extends Thread {

        int x;
        Font font16 = new Font("serif", Font.PLAIN, 16);
        String contributors = "Contributors : Kara Kytle, " + 
                              "Jan Borgersen, " + "Brian Lichtenwalter";
        int strWidth = getFontMetrics(font16).stringWidth(contributors);

        public void run() {
            x = -999; 
            while (!playbackMonitor.isShowing()) {
                try { sleep(999); } catch (Exception e) { return; }
            }
            for (int i = 0; i < 100; i++) {
                try { sleep(99); } catch (Exception e) { return; }
            }
            while (true) {
                if (--x < -strWidth) {
                    x = playbackMonitor.getSize().width;
                }
                playbackMonitor.repaint();
                try { sleep(99); } catch (Exception ex) { break; }
            }
        }

        public void render(Dimension d, Graphics2D g2) {
            if (isAlive()) {
                g2.setFont(font16);
                g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
                                    RenderingHints.VALUE_ANTIALIAS_OFF);
                g2.drawString(contributors, x, d.height-5);
            }
        }
    }
            

    public static void main(String args[]) {
        String media = "./audio";
        final Juke juke = new Juke(args.length == 0 ? media : args[0]);
        juke.open();
        JFrame f = new JFrame("Juke Box");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
            public void windowIconified(WindowEvent e) { 
                juke.credits.interrupt();
            }
        });
        f.getContentPane().add("Center", juke);
        f.pack();
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        int w = 750;
        int h = 340;
        f.setLocation(screenSize.width/2 - w/2, screenSize.height/2 - h/2);
        f.setSize(w, h);
        f.setVisible(true);
        if (args.length > 0) {
            File file = new File(args[0]);
            if (file == null && !file.isDirectory()) {
                System.out.println("usage: java Juke audioDirectory");
            } 
        }
    }
}