java - 单击 Gridlayout 按钮，然后在按钮下加载一个 Java 表单

Question

我现在真的不知道如何提出问题，我有一个带有 4 个按钮的网格布局。当用户按下“添加模块”时，如果可能的话，我希望按钮下有一个表单而不是新窗口。

frame = new JFrame("ModuleViewer");
   makeMenu(frame);

   Container contentPane = frame.getContentPane();

    // Specify the layout manager with nice spacing
   contentPane.setLayout(new GridLayout(0, 2));

   addModule = new JButton("Toevoegen Module");
   contentPane.add(addModule);

   overview = new JButton("Overzicht Modules");
   contentPane.add(overview);

   addSchoolweeks = new JButton("Aapassen schoolweken");
   contentPane.add(addSchoolweeks);

   weekheavy = new JButton("Weekbelasting");
   contentPane.add(weekheavy);

   frame.pack();

   Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
   frame.setLocation(d.width/2 - frame.getWidth()/2, d.height/2 - frame.getHeight()/2);
   frame.setVisible(true);

我知道我首先需要为按钮添加 een 操作方法，我知道如何做到这一点，所以这并不重要。我只想知道如何在按钮下创建布局，以便当用户单击时将绘制布局。

Answer 1

每个面板只能有一种布局，但您可以使用多个面板来达到所需的效果:顶部面板使用 GridLayout 来容纳按钮，底部面板使用 CardLayout 来容纳多个其他面板，每个按钮单击一个面板。每个面板都可以使用您想要的任何布局，具体取决于其内容。

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

public class CardLayoutDemo implements Runnable
{
  final static String CARD1 = "Red";
  final static String CARD2 = "Green";
  final static String CARD3 = "Blue";

  JPanel cards;
  CardLayout cardLayout;

  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new CardLayoutDemo());
  }

  public void run()
  {
    JButton btnRed   = createButton("Red");
    JButton btnGreen = createButton("Green");
    JButton btnBlue  = createButton("Blue");

    JPanel buttons = new JPanel(new GridLayout(1,3));
    buttons.add(btnRed);
    buttons.add(btnGreen);
    buttons.add(btnBlue);

    JPanel card1 = new JPanel();
    card1.setBackground(Color.RED);

    JPanel card2 = new JPanel();
    card2.setBackground(Color.GREEN);

    JPanel card3 = new JPanel();
    card3.setBackground(Color.BLUE);

    cardLayout = new CardLayout();
    cards = new JPanel(cardLayout);
    cards.add(card1, CARD1);
    cards.add(card2, CARD2);
    cards.add(card3, CARD3);

    JFrame f = new JFrame("CardLayout Demo");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(buttons, BorderLayout.NORTH);
    f.add(cards, BorderLayout.CENTER);
    f.setSize(300, 200);
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }

  private JButton createButton(final String name)
  {
    JButton button = new JButton(name);
    button.addActionListener(new ActionListener()
    {
      @Override
      public void actionPerformed(ActionEvent e)
      {
        cardLayout.show(cards, name);
      }
    });

    return button;
  }
}