java - 在切换时故意使 CardLayout 中的组件不可见

Question

问题：使用 CardLayout，当我运行应用程序并切换到另一张卡片时，所有组件都会显示。我希望与 JPanel card3 关联的组件在我切换另一张卡时不显示。这可能吗？

我希望在切换卡片布局时不显示 card3 组件（基本上只有四个按钮）。

public class App2 implements ActionListener {
JPanel cards; 
final static String BUTTONPANEL = "Switch Mode";
final static String TEXTPANEL = "Card with JTextField";

public void addComponentToPane(Container pane) {
    JPanel comboBoxPane = new JPanel();
    String comboBoxItems[] = { BUTTONPANEL, TEXTPANEL };
    JButton jb = new JButton("Switch Mode");
    jb.setFocusable(false);
    jb.addActionListener(this);
    comboBoxPane.add(jb);

    //Create the "cards".
    JPanel card1 = new JPanel(new GridLayout(6,1));
    comboBoxPane.add(card1);

    JPanel card3 = new JPanel(new GridLayout(6,1));
    comboBoxPane.add(card3);

    card1.add(new JLabel("Current Mode: Edit"));
    card1.add(new JLabel("Question"));
    card1.add(new JTextField(30));
    card1.add(new JLabel("Answer"));
    card1.add(new JTextField(30));

    card3.add(new JButton("Previous"));
    card3.add(new JButton("Next"));
    card3.add(new JButton("Add"));
    card3.add(new JButton("Save"));

    JPanel card2 = new JPanel(new GridLayout(6,1));
    card2.add(new JLabel("Current Mode: Test"));
    card2.add(new JLabel("Question"));
    card2.add(new JTextField("", 20));
    card2.add(new JLabel("Answer"));
    card2.add(new JTextField("", 20));


    cards = new JPanel(new CardLayout());
    cards.add(card1, BUTTONPANEL);
    cards.add(card2, TEXTPANEL);

    pane.add(comboBoxPane, BorderLayout.PAGE_END);
    pane.add(cards, BorderLayout.CENTER);
}

@Override
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    CardLayout cl = (CardLayout)(cards.getLayout());
    cl.show(cards, TEXTPANEL);  
    card3.setVisible(false);
}


private static void createAndShowGUI() {
    JFrame frame = new JFrame("Flash Cards");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    App2 demo = new App2();
    demo.addComponentToPane(frame.getContentPane());

    frame.pack();
    frame.setVisible(true);
}

标签： javaeclipseswing