Một giải pháp: chỉ cần có bộ điều khiển cập nhật mô hình. Sau đó, người nghe gắn liền với mô hình sẽ cập nhật các khung nhìn. Bạn cũng có thể có JMenuItems và JButtons tương ứng chia sẻ cùng một Action, và do đó khi bạn vô hiệu hóa Action nó sẽ vô hiệu hóa tất cả các nút/menu/etc sử dụng Action đó.
Ví dụ, lớp chính:
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class MvcExample {
private static void createAndShowGui() {
MyView view = new MyView();
MyMenuBar menuBar = new MyMenuBar();
MyModel model = new MyModel();
MyControl control = new MyControl(model);
control.addProgressMonitor(view);
control.addView(view);
control.addView(menuBar);
model.setState(MyState.STOP);
JFrame frame = new JFrame("MVC Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(view.getMainPanel());
frame.setJMenuBar(menuBar.getMenuBar());
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
private static final byte[] DATA_ARRAY = { 0x43, 0x6f, 0x70, 0x79, 0x72,
0x69, 0x67, 0x68, 0x74, 0x20, 0x46, 0x75, 0x62, 0x61, 0x72, 0x61,
0x62, 0x6c, 0x65, 0x2c, 0x20, 0x30, 0x36, 0x2f, 0x31, 0x36, 0x2f,
0x32, 0x30, 0x31, 0x32, 0x2e, 0x20, 0x46, 0x75, 0x62, 0x61, 0x72,
0x61, 0x62, 0x6c, 0x65, 0x20, 0x52, 0x75, 0x6c, 0x65, 0x73, 0x21 };
}
Các điều khiển:
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.AbstractAction;
@SuppressWarnings("serial")
public class MyControl {
private MyModel model;
private PlayAction playAction = new PlayAction();
private PauseAction pauseAction = new PauseAction();
private StopAction stopAction = new StopAction();
private List<MyProgressMonitor> progMonitorList = new ArrayList<MyProgressMonitor>();
public MyControl(MyModel model) {
this.model = model;
model.addPropertyChangeListener(new MyPropChangeListener());
}
public void addProgressMonitor(MyProgressMonitor progMonitor) {
progMonitorList.add(progMonitor);
}
public void addView(MySetActions setActions) {
setActions.setPlayAction(playAction);
setActions.setPauseAction(pauseAction);
setActions.setStopAction(stopAction);
}
private class MyPropChangeListener implements PropertyChangeListener {
@Override
public void propertyChange(PropertyChangeEvent pcEvt) {
if (MyState.class.getName().equals(pcEvt.getPropertyName())) {
MyState state = (MyState) pcEvt.getNewValue();
if (state == MyState.PLAY) {
playAction.setEnabled(false);
pauseAction.setEnabled(true);
stopAction.setEnabled(true);
} else if (state == MyState.PAUSE) {
playAction.setEnabled(true);
pauseAction.setEnabled(false);
stopAction.setEnabled(true);
} else if (state == MyState.STOP) {
playAction.setEnabled(true);
pauseAction.setEnabled(false);
stopAction.setEnabled(false);
}
}
if (MyModel.PROGRESS.equals(pcEvt.getPropertyName())) {
for (MyProgressMonitor progMonitor : progMonitorList) {
int progress = (Integer) pcEvt.getNewValue();
progMonitor.setProgress(progress);
}
}
}
}
private class PlayAction extends AbstractAction {
public PlayAction() {
super("Play");
putValue(MNEMONIC_KEY, KeyEvent.VK_P);
}
@Override
public void actionPerformed(ActionEvent e) {
model.play();
}
}
private class StopAction extends AbstractAction {
public StopAction() {
super("Stop");
putValue(MNEMONIC_KEY, KeyEvent.VK_S);
}
@Override
public void actionPerformed(ActionEvent e) {
model.stop();
}
}
private class PauseAction extends AbstractAction {
public PauseAction() {
super("Pause");
putValue(MNEMONIC_KEY, KeyEvent.VK_A);
}
@Override
public void actionPerformed(ActionEvent e) {
model.pause();
}
}
}
Một Nhà nước Enum:
public enum MyState {
PLAY, STOP, PAUSE
}
Một trong những giao diện xem:
import javax.swing.Action;
public interface MySetActions {
void setPlayAction(Action playAction);
void setPauseAction(Action pauseAction);
void setStopAction(Action stopAction);
}
Một giao diện xem:
public interface MyProgressMonitor {
void setProgress(int progress);
}
Các chính Xem GUI:
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
public class MyView implements MySetActions, MyProgressMonitor {
private JButton playButton = new JButton();
private JButton stopButton = new JButton();
private JButton pauseButton = new JButton();
private JPanel mainPanel = new JPanel();
private JProgressBar progressBar = new JProgressBar();
public MyView() {
progressBar.setBorderPainted(true);
JPanel btnPanel = new JPanel(new GridLayout(1, 0, 5, 0));
btnPanel.add(playButton);
btnPanel.add(pauseButton);
btnPanel.add(stopButton);
mainPanel.setLayout(new BorderLayout(0, 5));
mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 15, 5, 15));
mainPanel.add(btnPanel, BorderLayout.CENTER);
mainPanel.add(progressBar, BorderLayout.PAGE_END);
}
@Override
public void setPlayAction(Action playAction) {
playButton.setAction(playAction);
}
@Override
public void setStopAction(Action stopAction) {
stopButton.setAction(stopAction);
}
@Override
public void setPauseAction(Action pauseAction) {
pauseButton.setAction(pauseAction);
}
@Override
public void setProgress(int progress) {
progressBar.setValue(progress);
}
public JComponent getMainPanel() {
return mainPanel;
}
}
Phần thanh menu của Xem:
import java.awt.event.KeyEvent;
import javax.swing.Action;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
public class MyMenuBar implements MySetActions {
private JMenuItem playMenItem = new JMenuItem();
private JMenuItem pauseMenuItem = new JMenuItem();
private JMenuItem stopMenItem = new JMenuItem();
private JMenuBar menuBar = new JMenuBar();
public MyMenuBar() {
JMenu menu = new JMenu("Main Menu");
menu.setMnemonic(KeyEvent.VK_M);
menu.add(playMenItem);
menu.add(pauseMenuItem);
menu.add(stopMenItem);
menuBar.add(menu);
}
public JMenuBar getMenuBar() {
return menuBar;
}
@Override
public void setPlayAction(Action playAction) {
playMenItem.setAction(playAction);
}
@Override
public void setStopAction(Action stopAction) {
stopMenItem.setAction(stopAction);
}
@Override
public void setPauseAction(Action pauseAction) {
pauseMenuItem.setAction(pauseAction);
}
}
Và cuối cùng, các mô hình:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeListener;
import javax.swing.Timer;
import javax.swing.event.SwingPropertyChangeSupport;
public class MyModel {
public final static String PROGRESS = "progress";
protected static final int MAX_PROGRESS = 100;
private MyState state = null;
private SwingPropertyChangeSupport pcSupport = new SwingPropertyChangeSupport(
this);
private Timer timer;
private int progress = 0;
public MyState getState() {
return state;
}
public void setState(MyState state) {
MyState oldValue = this.state;
MyState newValue = state;
this.state = newValue;
pcSupport.firePropertyChange(MyState.class.getName(), oldValue, newValue);
}
public int getProgress() {
return progress;
}
public void setProgress(int progress) {
Integer oldValue = this.progress;
Integer newValue = progress;
this.progress = newValue;
pcSupport.firePropertyChange(PROGRESS, oldValue, newValue);
}
public void play() {
MyState oldState = getState();
setState(MyState.PLAY);
if (oldState == MyState.PAUSE) {
if (timer != null) {
timer.start();
return;
}
}
int timerDelay = 50;
// simulate playing ....
timer = new Timer(timerDelay, new ActionListener() {
int timerProgress = 0;
@Override
public void actionPerformed(ActionEvent actEvt) {
timerProgress++;
setProgress(timerProgress);
if (timerProgress >= MAX_PROGRESS) {
setProgress(0);
MyModel.this.stop();
}
}
});
timer.start();
}
public void pause() {
setState(MyState.PAUSE);
if (timer != null && timer.isRunning()) {
timer.stop();
}
}
public void stop() {
setState(MyState.STOP);
setProgress(0);
if (timer != null && timer.isRunning()) {
timer.stop();
}
timer = null;
}
public void addPropertyChangeListener(PropertyChangeListener listener) {
pcSupport.addPropertyChangeListener(listener);
}
public void removePropertyChangeListener(PropertyChangeListener listener) {
pcSupport.removePropertyChangeListener(listener);
}
}
Vui lòng hỏi xem có điều nào ít gây nhầm lẫn không.
Vui lòng xem chỉnh sửa câu trả lời của tôi cũng như ví dụ về mã. –