右键单击JButton

Question

尝试将一个mouseAdapter添加到JButton中以右键单击以标记该单元格。问题是当我将它实例化到按钮上时，它不会让我。也许是因为它上面已经有一个actionlistener？我不太确定。任何帮助表示赞赏。我正在创造一个扫雷游戏，fyi。

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]);

最终如果有效，我想将其纳入游戏：

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);
        }
    }
});

Answer 1

对于扫雷游戏，您需要寻找

1）JToggleButton

2）将Icon添加到JToggleButton方法

• JToggleButton#setIcon();

• JToggleButton#setSelectedIcon();

• JToggleButton#setDisabledIcon();

3）将MouseListener添加到JToggleButton

4）使用

中的方法mouseClicked覆盖SwingUtilities.isRightMouseButton()

结果可能是

来自代码

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();
            }
        });
    }
}

Answer 2

MouseAdapter是一个抽象类，您无法创建它的实例。 这就是你得到错误的原因。

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. ; )
    }
});