在JButton上右键单击

Question

我尝试给JButton添加一个鼠标适配器，以便右键单击来标记该单元格。问题是当我将其实例化到按钮上时，它不允许我这样做。可能是因为它已经有一个动作侦听器吗？我不太确定。非常感谢任何帮助。顺便说一下，我正在创建扫雷游戏。

button = new JButton[size][size];
ButtonListener bl = new ButtonListener();
for (int r = 0; r < size; r++) {
for (int c = 0; c < size; c++) {
button[r][c] = new JButton("");
button[r][c].addActionListener(bl);
button[r][c].addMouseListener (new MouseAdapter());``
// error message: cannot instantiate the type MouseAdapter
panel.add(button[r][c]);

如果最终它有效，我希望将其纳入游戏中：

button.addMouseListener(new MouseAdapter() { 
    public void mouseClicked(MouseEvent e) {
        if (e.getButton() == 3) { // if right click
            button.setText("F");
            button.getModel().setPressed(false);
            // button.setEnabled(true);
        } else {
            button.setText("X");
            button.getModel().setPressed(true);
            // button.setEnabled(false);
        }
    }
});

- Loi

---

@deporter 你在说什么？这是那个人的第一个问题... - Radu Murzea

编译器在这里是你的朋友：你为什么想要注册一个无用的MouseListener呢？ :-) - kleopatra

Answer 1

对于扫雷游戏，您需要查找以下内容：

1）JToggleButton

2）将Icon添加到JToggleButton方法中

• JToggleButton#setIcon();

• JToggleButton#setSelectedIcon();

• JToggleButton#setDisabledIcon();

3）在JToggleButton中添加MouseListener

4）使用SwingUtilities.isRightMouseButton()方法覆盖mouseClicked

结果可能如下所示

代码如下：

import java.awt.Insets;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JToggleButton;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class MyToggleButton extends JFrame {

    private static final long serialVersionUID = 1L;
    private Icon errorIcon = UIManager.getIcon("OptionPane.errorIcon");
    private Icon infoIcon = UIManager.getIcon("OptionPane.informationIcon");
    private Icon warnIcon = UIManager.getIcon("OptionPane.warningIcon");

    public MyToggleButton() {
        final JToggleButton toggleButton = new JToggleButton();
        toggleButton.setBorderPainted(false);
        toggleButton.setBorder(null);
        toggleButton.setFocusable(false);
        toggleButton.setMargin(new Insets(0, 0, 0, 0));
        toggleButton.setContentAreaFilled(false);
        toggleButton.setIcon((errorIcon));
        toggleButton.setSelectedIcon(infoIcon);
        //toggleButton.setRolloverIcon((infoIcon));
        //toggleButton.setPressedIcon(warnIcon);
        toggleButton.setDisabledIcon(warnIcon);
        toggleButton.addMouseListener(new MouseListener() {

            public void mouseClicked(MouseEvent e) {
                if (SwingUtilities.isRightMouseButton(e) && e.getClickCount() == 1) {
                    if (toggleButton.isEnabled()) {
                        toggleButton.setEnabled(false);
                    } else {
                        toggleButton.setEnabled(true);
                    }
                }
            }

            public void mousePressed(MouseEvent e) {
            }

            public void mouseReleased(MouseEvent e) {
            }

            public void mouseEntered(MouseEvent e) {
            }

            public void mouseExited(MouseEvent e) {
            }
        });
        add(toggleButton);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                MyToggleButton t = new MyToggleButton();
            }
        });
    }
}

- mKorbel

Answer 2

MouseAdapter是一个抽象类，您不能创建它的实例。这就是为什么会出现错误的原因。

button[r][c].addMouseListener (new MouseAdapter());  //  this will not work

button[r][c].addMouseListener (new MouseAdapter(){});  // this will
                                                 ^

button[r][c].addMouseListener (new MouseAdapter(){
    public void mouseClicked(MouseEvent e){
         // and this will actually do sth. ; )
    }
});

- alex