java - 使用 MouseListener 的源更改 JLabel 的文本

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我正在为我的数独项目开发一个 java 组件。该组件代表一个数独框，可以有两种状态:数字或候选(我使用 CardLayout)。到目前为止，一切正常。我现在尝试在我的标签上添加一些 MouseListener。当我点击一个候选者时，我想用一个简单的数字更改状态的值，然后更改显示(cardlayout.show(...))。这里的问题是似乎检测到事件源，但更改尚未完成...这是我的代码(CaseComponent > createController > Candidate[i].addMouseListener() 中的问题:

    package sudoku;

import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class CaseComponent extends JPanel {

    private static final long serialVersionUID = 1L;
    private static final String CANDIDATES = "candidate";
    private static final String DIGIT = "digit";
    private GridBagConstraints gridBagConstraint;
    private JLabel[] candidates;
    private JLabel digit;

    public CaseComponent(Color caseColor){
        super();
        setLayout(new CardLayout());
        setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY));
        setPreferredSize(new Dimension(60, 60));
        setBackground(caseColor);
        createView();
        placeComponents();
        createController();
    }

    private void createView() {
        gridBagConstraint = new GridBagConstraints();
        candidates = new JLabel[9];
        for (int i = 0; i < 9; i++) {
            candidates[i] = new JLabel(""+(i + 1));
        }
        digit = new JLabel();
    }

    private void placeComponents() {
        JPanel p = new JPanel(new GridLayout(3, 3)); {
            for (int i = 0; i < 9; i++) {
                JPanel q = new JPanel(); {
                    q.add(candidates[i]);
                }
                q.setOpaque(false);
                p.add(q);  
            }
        }
        p.setOpaque(false);
        add(p, DIGIT);

        p = new JPanel(new GridBagLayout()); {
            p.add(digit, gridBagConstraint);
            p.setOpaque(false);
        }
        add(p, CANDIDATES);
    }

    private void createController() {
        digit.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                if (SwingUtilities.isRightMouseButton(e)) {
                    candidateDisplay();
                }
            }
        });

        for (int i = 0; i < 9; i++) {
            candidates[i].addMouseListener(new MouseAdapter() {
                @Override
                public void mousePressed(MouseEvent e) {
                    JLabel source = (JLabel) e.getSource();
                    if (SwingUtilities.isLeftMouseButton(e)) {
                        System.out.println("IN");
                        digitDisplay();
                        digit.setText(source.getText());
                   }
                }
            });
        }
    }

    private void digitDisplay() {
        CardLayout cl = (CardLayout) getLayout();
        cl.show(this, DIGIT);
    }

    private void candidateDisplay() {
        CardLayout cl = (CardLayout) getLayout();
        cl.show(this, CANDIDATES);
    }
   }

package sudoku;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.border.Border;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class Sudoku {

    // ATTRIBUTS
    private JFrame mainFrame;
    private Timer timer;
    private JButton pauseButton;
    private JButton resumeButton;
    private JButton penaltyButton;
    private JLabel chronoInfo;
    private Chronometer chrono;

    public Sudoku() {
        createModel();
        createView();
        placeComponents();
        createController();
    }

    // COMMANDES

    /**
     * Rend l'application visible au centre de l'écran.
     */
    public void display() {
        mainFrame.pack();
        mainFrame.setLocationRelativeTo(null);
        mainFrame.setVisible(true);
    }

    // OUTILS

    private void createModel() {
        chrono = new Chronometer();
    }

    private void createView() {
        mainFrame = new JFrame("Sudoku");

        resumeButton = new JButton("Reprendre");
        resumeButton.setEnabled(false);

        pauseButton = new JButton("Pause");

        penaltyButton = new JButton("Penalité");

        chronoInfo = new JLabel("00:00");
    }

    private void placeComponents() {
        JPanel p = new JPanel(); {
            p.add(resumeButton);
            p.add(pauseButton);
            p.add(penaltyButton);
        }
        mainFrame.add(p, BorderLayout.NORTH);

        p = new JPanel(); {
            p.add(chronoInfo);
        }
        mainFrame.add(p, BorderLayout.SOUTH);

        p = new JPanel(); {
            JPanel q = new JPanel(new GridLayout(3,3)); {
                for (int i = 0; i < 9; i++) {
                    Color caseColor = i % 2 == 0 ? Color.WHITE : Color.GRAY;
                    JPanel r = new JPanel(new GridLayout(3,3)); {
                        for (int j = 0; j < 9; j++) {
                            r.add(new CaseComponent(caseColor));
                        }
                    }
                    r.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
                    q.add(r);
                }
            }
            q.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
            p.add(q);
        }
        mainFrame.add(p);

    }

    private void createController() {
        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final int delay = 1000;
        timer = new Timer(delay, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                chrono.increment();
                chronoInfo.setText(chrono.toString());
            }
        });
        timer.start();

        resumeButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                timer.start();
                chrono.setPaused(false);
            }
        });

        pauseButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                timer.stop();
                chrono.setPaused(true);
            }
        });

        penaltyButton.addActionListener(new ActionListener() {    
            @Override
            public void actionPerformed(ActionEvent e) {
                chrono.penalty();
                chronoInfo.setText(chrono.toString());
            }
        });

        chrono.addChangeListener(new ChangeListener() {     
            @Override
            public void stateChanged(ChangeEvent e) {
                resumeButton.setEnabled(chrono.isPaused());
                pauseButton.setEnabled(!chrono.isPaused());
            }
        });
    }

    // POINT D'ENTREE

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Sudoku().display();
            }
        });
    }

}




package sudoku;

import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.EventListenerList;

public class Chronometer {

    // ATTRIBUTS
    private static final int MAX_SECONDS = 60;
    private final EventListenerList listeners;
    private final ChangeEvent changeEvent;
    private int seconds;
    private int minutes;
    private boolean paused;

    // CONSTRUCTEUR

    public Chronometer() {
        listeners = new EventListenerList();
        changeEvent = new ChangeEvent(this);
        seconds = 0;
        minutes = 0;
        paused = false;
    }

    // REQUETES

    public int getSeconds() {
        return seconds;
    }

    public int getMinutes() {
        return minutes;
    }

    public boolean isPaused() {
        return paused;
    }

    public ChangeListener[] getChangeListeners() {
        return listeners.getListeners(ChangeListener.class);
    }

    // COMMANDES

    public void setSeconds(int s) {
        seconds = s;
    }

    public void setMinutes(int m) {
        minutes = m;
    }

    public void setPaused(boolean b) {
        paused = b;
        fireStateChanged();
    }

    public void increment() {
        seconds++;
        if (seconds == MAX_SECONDS) {
           seconds = 0;
           minutes++;
        }
    }

    public void penalty() {
        seconds += 10;
        if (seconds >= MAX_SECONDS) {
            minutes++;
            seconds -= MAX_SECONDS; 
        }
    }

    public void reset() {
        seconds = 0;
        minutes = 0;
        fireStateChanged();
    }

    public void addChangeListener(ChangeListener listener) {
        if (listener == null) {
            return;
        }
        listeners.add(ChangeListener.class, listener);
    }

    public void removeChangeListener(ChangeListener listener) {
        if (listener == null) {
            return;
        }
        listeners.remove(ChangeListener.class, listener);
    }

    public String toString() {
        return String.format("%02d:%02d", minutes, seconds);
    }

    // OUTILS

    protected void fireStateChanged() {
        ChangeListener[] listnrs = getChangeListeners();
        for (ChangeListener lst : listnrs) {
            lst.stateChanged(changeEvent);
        }
    }
}

我先谢谢你了!

Answer 1

现在看起来这是一个不错的程序!我快速浏览了一下，我相信我找到了问题所在。在 placeComponents 方法中，您交换了布局的候选者和数字键。我还删除了不必要的括号。

private void placeComponents() {
    JPanel p = new JPanel(new GridLayout(3, 3)); 
    for (int i = 0; i < 9; i++) {
        JPanel q = new JPanel(); {
            q.add(candidates[i]);
        }
        q.setOpaque(false);
        p.add(q);  
    }

    p.setOpaque(false);
    add(p, CANDIDATES); // was DIGIT

    p = new JPanel(new GridBagLayout()); {
        p.add(digit, gridBagConstraint);
        p.setOpaque(false);
    }
    add(p, DIGIT); // was CANDIDATES
}