复合模式-MVC

「爱情、让人受尽委屈。」 2022-07-16 16:16 114阅读 0赞

package N\_Composite.mvc;

import javax.swing.\*;

public class BeatBar extends JProgressBar implements Runnable \{  
private static final long serialVersionUID = 2L;  
JProgressBar progressBar;  
Thread thread;

public BeatBar() {
        thread = new Thread(this);
        setMaximum(100);
        thread.start();
    }
    
    public void run() {
        for(;;) {
            int value = getValue();
            value = (int)(value * .75);
            setValue(value);
            repaint();
            try {
                Thread.sleep(50);
            } catch (Exception e) {};
        }
    }

\}  
package N\_Composite.mvc;

public class BeatController implements ControllerInterface \{  
BeatModelInterface model;  
DJView view;

public BeatController(BeatModelInterface model) {
        this.model = model;
        view = new DJView(this, model);
        view.createView();
        view.createControls();
        view.disableStopMenuItem();
        view.enableStartMenuItem();
        model.initialize();
    }
    
    public void start() {
        model.on();
        view.disableStartMenuItem();
        view.enableStopMenuItem();
    }
    
    public void stop() {
        model.off();
        view.disableStopMenuItem();
        view.enableStartMenuItem();
    }
    
    public void increaseBPM() {
        int bpm = model.getBPM();
        model.setBPM(bpm + 1);
    }
    
    public void decreaseBPM() {
        int bpm = model.getBPM();
        model.setBPM(bpm - 1);
    }
    
    public void setBPM(int bpm) {
        model.setBPM(bpm);
    }

\}  
package N\_Composite.mvc;

import javax.sound.midi.\*;

import java.util.\*;

public class BeatModel implements BeatModelInterface, MetaEventListener \{  
Sequencer sequencer;  
ArrayList beatObservers = new ArrayList();  
ArrayList bpmObservers = new ArrayList();  
int bpm = 90;  
Sequence sequence;  
Track track;

public void initialize() {
        setUpMidi();
        buildTrackAndStart();
    }
    
    public void on() {
        System.out.println("Starting the sequencer");
        sequencer.start();
        setBPM(90);
    }
    
    public void off() {
        setBPM(0);
        sequencer.stop();
    }
    
    public void setBPM(int bpm) {
        this.bpm = bpm;
        sequencer.setTempoInBPM(getBPM());
        notifyBPMObservers();
    }
    
    public int getBPM() {
        return bpm;
    }
    
    void beatEvent() {
        notifyBeatObservers();
    }
    
    
    public void registerObserver(BeatObserver o) {
        beatObservers.add(o);
    }
    
    public void notifyBeatObservers() {
        for(int i = 0; i < beatObservers.size(); i++) {
            BeatObserver observer = (BeatObserver)beatObservers.get(i);
            observer.updateBeat();
        }
    }
    
    public void registerObserver(BPMObserver o) {
        bpmObservers.add(o);
    }
    
    public void notifyBPMObservers() {
        for(int i = 0; i < bpmObservers.size(); i++) {
            BPMObserver observer = (BPMObserver)bpmObservers.get(i);
            observer.updateBPM();
        }
    }
    
    
    public void removeObserver(BeatObserver o) {
        int i = beatObservers.indexOf(o);
        if (i >= 0) {
            beatObservers.remove(i);
        }
    }
    
    
    
    public void removeObserver(BPMObserver o) {
        int i = bpmObservers.indexOf(o);
        if (i >= 0) {
            bpmObservers.remove(i);
        }
    }
    
    
    public void meta(MetaMessage message) {
        if (message.getType() == 47) {
            beatEvent();
            sequencer.start();
            setBPM(getBPM());
        }
    }
    
    public void setUpMidi() {
        try {
            sequencer = MidiSystem.getSequencer();
            sequencer.open();
            sequencer.addMetaEventListener(this);
            sequence = new Sequence(Sequence.PPQ,4);
            track = sequence.createTrack();
            sequencer.setTempoInBPM(getBPM());
            sequencer.setLoopCount(Sequencer.LOOP_CONTINUOUSLY);
        } catch(Exception e) {
            e.printStackTrace();
        }
    } 
    
    public void buildTrackAndStart() {
        int[] trackList = {35, 0, 46, 0};
    
        sequence.deleteTrack(null);
        track = sequence.createTrack();
    
        makeTracks(trackList);
        track.add(makeEvent(192,9,1,0,4));      
        try {
            sequencer.setSequence(sequence);                    
        } catch(Exception e) {
            e.printStackTrace();
        }
    } 
    
    public void makeTracks(int[] list) {        
    
        for (int i = 0; i < list.length; i++) {
            int key = list[i];
    
            if (key != 0) {
                track.add(makeEvent(144,9,key, 100, i));
                track.add(makeEvent(128,9,key, 100, i+1));
            }
        }
    }
    
    public  MidiEvent makeEvent(int comd, int chan, 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);
    
        } catch(Exception e) {
            e.printStackTrace(); 
        }
        return event;
    }

\}  
package N\_Composite.mvc;

/\*\*  
\* 节拍模型  
\*/  
public interface BeatModelInterface \{

void initialize();
    
    void on();
    
    void off();
    
    void setBPM(int bpm);
    
    int getBPM();
    
    void registerObserver(BeatObserver o);
    
    void removeObserver(BeatObserver o);
    
    void registerObserver(BPMObserver o);
    
    void removeObserver(BPMObserver o);

\}  
package N\_Composite.mvc;

public interface BeatObserver \{  
void updateBeat();  
\}  
package N\_Composite.mvc;

public interface BPMObserver \{  
void updateBPM();  
\}  
package N\_Composite.mvc;

public interface ControllerInterface \{  
void start();  
void stop();  
void increaseBPM();  
void decreaseBPM();  
void setBPM(int bpm);  
\}  
package N\_Composite.mvc;

public class DJTestDrive \{

public static void main (String[] args) {
        BeatModelInterface model = new BeatModel();
        ControllerInterface controller = new BeatController(model);
    }

\}  
package N\_Composite.mvc;

import java.awt.\*;  
import java.awt.event.\*;  
import javax.swing.\*;

public class DJView implements ActionListener, BeatObserver, BPMObserver \{  
BeatModelInterface model;  
ControllerInterface controller;  
JFrame viewFrame;  
JPanel viewPanel;  
BeatBar beatBar;  
JLabel bpmOutputLabel;  
JFrame controlFrame;  
JPanel controlPanel;  
JLabel bpmLabel;  
JTextField bpmTextField;  
JButton setBPMButton;  
JButton increaseBPMButton;  
JButton decreaseBPMButton;  
JMenuBar menuBar;  
JMenu menu;  
JMenuItem startMenuItem;  
JMenuItem stopMenuItem;

public DJView(ControllerInterface controller, BeatModelInterface model) {   
        this.controller = controller;
        this.model = model;
        model.registerObserver((BeatObserver)this);
        model.registerObserver((BPMObserver)this);
    }
    
    public void createView() {
        // Create all Swing components here
        viewPanel = new JPanel(new GridLayout(1, 2));
        viewFrame = new JFrame("View");
        viewFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        viewFrame.setSize(new Dimension(100, 80));
        bpmOutputLabel = new JLabel("offline", SwingConstants.CENTER);
        beatBar = new BeatBar();
        beatBar.setValue(0);
        JPanel bpmPanel = new JPanel(new GridLayout(2, 1));
        bpmPanel.add(beatBar);
        bpmPanel.add(bpmOutputLabel);
        viewPanel.add(bpmPanel);
        viewFrame.getContentPane().add(viewPanel, BorderLayout.CENTER);
        viewFrame.pack();
        viewFrame.setVisible(true);
    }
    
    
    public void createControls() {
        // Create all Swing components here
        JFrame.setDefaultLookAndFeelDecorated(true);
        controlFrame = new JFrame("Control");
        controlFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        controlFrame.setSize(new Dimension(100, 80));
    
        controlPanel = new JPanel(new GridLayout(1, 2));
    
        menuBar = new JMenuBar();
        menu = new JMenu("DJ Control");
        startMenuItem = new JMenuItem("Start");
        menu.add(startMenuItem);
        startMenuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                controller.start();
            }
        });
        stopMenuItem = new JMenuItem("Stop");
        menu.add(stopMenuItem); 
        stopMenuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                controller.stop();
            }
        });
        JMenuItem exit = new JMenuItem("Quit");
        exit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });
    
        menu.add(exit);
        menuBar.add(menu);
        controlFrame.setJMenuBar(menuBar);
    
        bpmTextField = new JTextField(2);
        bpmLabel = new JLabel("Enter BPM:", SwingConstants.RIGHT);
        setBPMButton = new JButton("Set");
        setBPMButton.setSize(new Dimension(10,40));
        increaseBPMButton = new JButton(">>");
        decreaseBPMButton = new JButton("<<");
        setBPMButton.addActionListener(this);
        increaseBPMButton.addActionListener(this);
        decreaseBPMButton.addActionListener(this);
    
        JPanel buttonPanel = new JPanel(new GridLayout(1, 2));
    
        buttonPanel.add(decreaseBPMButton);
        buttonPanel.add(increaseBPMButton);
    
        JPanel enterPanel = new JPanel(new GridLayout(1, 2));
        enterPanel.add(bpmLabel);
        enterPanel.add(bpmTextField);
        JPanel insideControlPanel = new JPanel(new GridLayout(3, 1));
        insideControlPanel.add(enterPanel);
        insideControlPanel.add(setBPMButton);
        insideControlPanel.add(buttonPanel);
        controlPanel.add(insideControlPanel);
    
        bpmLabel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
        bpmOutputLabel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    
        controlFrame.getRootPane().setDefaultButton(setBPMButton);
        controlFrame.getContentPane().add(controlPanel, BorderLayout.CENTER);
    
        controlFrame.pack();
        controlFrame.setVisible(true);
    }
    
    public void enableStopMenuItem() {
        stopMenuItem.setEnabled(true);
    }
    
    public void disableStopMenuItem() {
        stopMenuItem.setEnabled(false);
    }
    
    public void enableStartMenuItem() {
        startMenuItem.setEnabled(true);
    }
    
    public void disableStartMenuItem() {
        startMenuItem.setEnabled(false);
    }
    
    public void actionPerformed(ActionEvent event) {
        if (event.getSource() == setBPMButton) {
            int bpm = Integer.parseInt(bpmTextField.getText());
            controller.setBPM(bpm);
        } else if (event.getSource() == increaseBPMButton) {
            controller.increaseBPM();
        } else if (event.getSource() == decreaseBPMButton) {
            controller.decreaseBPM();
        }
    }
    
    public void updateBPM() {
        if (model != null) {
            int bpm = model.getBPM();
            if (bpm == 0) {
                if (bpmOutputLabel != null) {
                    bpmOutputLabel.setText("offline");
                }
            } else {
                if (bpmOutputLabel != null) {
                    bpmOutputLabel.setText("Current BPM: " + model.getBPM());
                }
            }
        }
    }
    
    public void updateBeat() {
        if (beatBar != null) {
             beatBar.setValue(100);
        }
    }

\}  
package N\_Composite.mvc;

public class HeartAdapter implements BeatModelInterface \{  
HeartModelInterface heart;

public HeartAdapter(HeartModelInterface heart) {
        this.heart = heart;
    }
    
    public void initialize() {}
    
    public void on() {}
    
    public void off() {}
    
    public int getBPM() {
        return heart.getHeartRate();
    }
    
    public void setBPM(int bpm) {}
    
    public void registerObserver(BeatObserver o) {
        heart.registerObserver(o);
    }
    
    public void removeObserver(BeatObserver o) {
        heart.removeObserver(o);
    }
    
    public void registerObserver(BPMObserver o) {
        heart.registerObserver(o);
    }
    
    public void removeObserver(BPMObserver o) {
        heart.removeObserver(o);
    }

\}  
package N\_Composite.mvc;

public class HeartController implements ControllerInterface \{  
HeartModelInterface model;  
DJView view;

public HeartController(HeartModelInterface model) {
        this.model = model;
        view = new DJView(this, new HeartAdapter(model));
        view.createView();
        view.createControls();
        view.disableStopMenuItem();
        view.disableStartMenuItem();
    }
    
    public void start() {}
    
    public void stop() {}
    
    public void increaseBPM() {}
    
    public void decreaseBPM() {}
    
    public void setBPM(int bpm) {}

package N\_Composite.mvc;

import java.util.\*;

public class HeartModel implements HeartModelInterface, Runnable \{  
ArrayList beatObservers = new ArrayList();  
ArrayList bpmObservers = new ArrayList();  
int time = 1000;  
int bpm = 90;  
Random random = new Random(System.currentTimeMillis());  
Thread thread;

public HeartModel() {
        thread = new Thread(this);
        thread.start();
    }
    
    public void run() {
        int lastrate = -1;
    
        for(;;) {
            int change = random.nextInt(10);
            if (random.nextInt(2) == 0) {
                change = 0 - change;
            }
            int rate = 60000/(time + change);
            if (rate < 120 && rate > 50) {
                time += change;
                notifyBeatObservers();
                if (rate != lastrate) {
                    lastrate = rate;
                    notifyBPMObservers();
                }
            }
            try {
                Thread.sleep(time);
            } catch (Exception e) {}
        }
    }
    public int getHeartRate() {
        return 60000/time;
    }
    
    public void registerObserver(BeatObserver o) {
        beatObservers.add(o);
    }
    
    public void removeObserver(BeatObserver o) {
        int i = beatObservers.indexOf(o);
        if (i >= 0) {
            beatObservers.remove(i);
        }
    }
    
    public void notifyBeatObservers() {
        for(int i = 0; i < beatObservers.size(); i++) {
            BeatObserver observer = (BeatObserver)beatObservers.get(i);
            observer.updateBeat();
        }
    }
    
    public void registerObserver(BPMObserver o) {
        bpmObservers.add(o);
    }
    
    public void removeObserver(BPMObserver o) {
        int i = bpmObservers.indexOf(o);
        if (i >= 0) {
            bpmObservers.remove(i);
        }
    }
    
    public void notifyBPMObservers() {
        for(int i = 0; i < bpmObservers.size(); i++) {
            BPMObserver observer = (BPMObserver)bpmObservers.get(i);
            observer.updateBPM();
        }
    }

\}  
package N\_Composite.mvc;

public interface HeartModelInterface \{  
int getHeartRate();  
void registerObserver(BeatObserver o);  
void removeObserver(BeatObserver o);  
void registerObserver(BPMObserver o);  
void removeObserver(BPMObserver o);  
\}  
package N\_Composite.mvc;

public class HeartTestDrive \{

public static void main (String[] args) {
        HeartModel heartModel = new HeartModel();
        ControllerInterface model = new HeartController(heartModel);
    }