java - 如何在不隐藏其标签的情况下禁用 JButton？

Question

我正在使用 netbeans IDE 开发 Java 项目，我需要禁用特定的 JButton。为此，我使用以下代码。

IssuBtn.setEnabled(false);

但在它被禁用后，它不会在 JButton 上显示文本。我怎样才能将该文本保留在 JButton 上？

Answer 1

这个实验表明一个答案是“使用非金属的 PLAF”。

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

class LookOfDisabledButton {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JPanel gui = new JPanel(new BorderLayout(3,3));
                JPanel pEnabled = new JPanel(new GridLayout(1,0,2,2));
                pEnabled.setBackground(Color.green);
                gui.add(pEnabled, BorderLayout.NORTH);

                JPanel pDisabled = new JPanel(new GridLayout(1,0,2,2));
                pDisabled.setBackground(Color.red);
                gui.add(pDisabled, BorderLayout.SOUTH);

                UIManager.LookAndFeelInfo[] plafs = 
                    UIManager.getInstalledLookAndFeels();
                for (UIManager.LookAndFeelInfo plafInfo : plafs) {
                    try {
                        UIManager.setLookAndFeel(plafInfo.getClassName());
                        JButton bEnabled = new JButton(plafInfo.getName());
                        pEnabled.add(bEnabled);
                        JButton bDisabled = new JButton(plafInfo.getName());
                        bDisabled.setEnabled(false);
                        pDisabled.add(bDisabled);
                    } catch(Exception e) {
                        e.printStackTrace();
                    }
                }

                JOptionPane.showMessageDialog(null, gui);
            }
        });
    }
}

---

或者，调整 UIManager 中的值。

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

class LookOfDisabledButton {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JPanel gui = new JPanel(new BorderLayout(3,3));
                JPanel pEnabled = new JPanel(new GridLayout(1,0,2,2));
                pEnabled.setBackground(Color.green);
                gui.add(pEnabled, BorderLayout.NORTH);

                JPanel pDisabled = new JPanel(new GridLayout(1,0,2,2));
                pDisabled.setBackground(Color.red);
                gui.add(pDisabled, BorderLayout.SOUTH);

                // tweak the Color of the Metal disabled button
                UIManager.put("Button.disabledText", new Color(40,40,255));

                UIManager.LookAndFeelInfo[] plafs = 
                    UIManager.getInstalledLookAndFeels();
                for (UIManager.LookAndFeelInfo plafInfo : plafs) {
                    try {
                        UIManager.setLookAndFeel(plafInfo.getClassName());
                        JButton bEnabled = new JButton(plafInfo.getName());
                        pEnabled.add(bEnabled);
                        JButton bDisabled = new JButton(plafInfo.getName());
                        bDisabled.setEnabled(false);
                        pDisabled.add(bDisabled);
                    } catch(Exception e) {
                        e.printStackTrace();
                    }
                }

                JOptionPane.showMessageDialog(null, gui);
            }
        });
    }
}

---

正如 kleopatra 所指出的..

it's not a solution but might be a pointer to the direction to search for a solution

“它”是我的答案。事实上，我怀疑她是通过评论找到了真正的原因:

guessing only: here it's due to violating the one-plaf-only rule.

我同意这个猜测。