框架 2 内框架 1

frame 2 inside frame 1(框架 2 内框架 1)

问题描述

我有 2 节课；学生和注册学生，因此有 2 个不同的 main_panel(1 类)和 panel_1(2 类).我想要做的是，当按下学生界面上的按钮时，整个 panel_1 应该出现在 main_panel 中.我已经将两者都设置为相同的大小.这可能吗?

I have 2 classes; Students and RegisterStudents, and hence 2 different main_panel(Class 1) and panel_1 (Class 2). What I am trying to do is, when a button on the Students Interface is pressed, the whole panel_1 should appear within main_panel. I have set both to same size already. is that possible?

目前我得到的代码是:

JButton btnNewButton = new JButton("Register Student");
btnNewButton.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent arg0) {


Students main_panel = new Students();
RegisterStudent panel_1 = new RegisterStudent();
main_panel.add(panel_1);


}
});
btnNewButton.setBounds(0, 162, 167, 37);
panel.add(btnNewButton);

这不是在做什么吗?它正在编译，但 panel_1 实际上并没有出现在 main_panel 中.有人有什么建议吗?

This isnt doing anything though? its compiling, but panel_1 is not actually appearing inside the main_panel. Has anyone got any suggestions?

推荐答案

对于这样的事情我建议你使用 卡片布局当您向容器添加内容时，您必须调用 revalidate() 和 repaint() 方法来实现在运行时对其所做的更改.就像在你的情况下你添加 main_panel.add(panel_1);现在之后你必须执行

For such things I would suggest you to use CardLayout When you add something to the container, you must call revalidate() and repaint() methods to realize the changes made to it at RunTime. Like in your case you adding main_panel.add(panel_1);now after this you must perform

main_panel.revalidate();
main_panel.repaint();
frame.getRootPane().revalidate(); // for Upto JDK 1.6.
frame.revalidate();  // for JDK 1.7+
frame.repaint();

这样可以看到变化.一小段代码可帮助您理解我的意思.

so that changes can be seen. A small code snippet to help you understand what I mean.

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

public class MultiplePanels extends JFrame
{
    private JPanel registrationPanel, loginPanel, searchPanel;

    private JButton registerButton, loginButton, searchButton;  

    private ActionListener action;

    public MultiplePanels()
    {       
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);            

        registrationPanel = new JPanel();
        registrationPanel.setBackground(Color.WHITE);

        loginPanel = new JPanel();
        loginPanel.setBackground(Color.YELLOW);

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

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(0, 1));
        buttonPanel.setBackground(Color.DARK_GRAY);

        registerButton = new JButton("REGISTER");       
        loginButton = new JButton("LOGIN");     
        searchButton = new JButton("SEARCH");

        buttonPanel.add(registerButton);
        buttonPanel.add(loginButton);
        buttonPanel.add(searchButton);

        action = new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                JButton button = (JButton) ae.getSource();

                if (button == registerButton)
                {
                    if (!(loginPanel.isShowing()) && !(searchPanel.isShowing()))
                    {
                        add(registrationPanel, BorderLayout.CENTER);
                    }
                    else 
                    {
                        if (loginPanel.isShowing())
                        {
                            remove(loginPanel);
                            add(registrationPanel, BorderLayout.CENTER);
                        }
                        else if (searchPanel.isShowing())
                        {
                            remove(searchPanel);
                            add(registrationPanel, BorderLayout.CENTER);
                        }
                    }
                }
                else if (button == loginButton)
                {
                    if (!(registrationPanel.isShowing()) && !(searchPanel.isShowing()))
                    {
                        add(loginPanel, BorderLayout.CENTER);
                    }
                    else 
                    {
                        if (registrationPanel.isShowing())
                        {
                            remove(registrationPanel);
                            add(loginPanel, BorderLayout.CENTER);
                        }
                        else if (searchPanel.isShowing())
                        {
                            remove(searchPanel);
                            add(loginPanel, BorderLayout.CENTER);
                        }
                    }
                }
                else if (button == searchButton)
                {
                    if (!(loginPanel.isShowing()) && !(registrationPanel.isShowing()))
                    {
                        add(searchPanel, BorderLayout.CENTER);
                    }
                    else 
                    {
                        if (loginPanel.isShowing())
                        {
                            remove(loginPanel);
                            add(searchPanel, BorderLayout.CENTER);
                        }
                        else if (registrationPanel.isShowing())
                        {
                            remove(registrationPanel);
                            add(searchPanel, BorderLayout.CENTER);
                        }
                    }
                }
                // This is what we are doing here to realize the changes
                // made to the GUI.
                revalidate();
                repaint();
            }
        };

        registerButton.addActionListener(action);
        loginButton.addActionListener(action);
        searchButton.addActionListener(action);

        add(buttonPanel, BorderLayout.LINE_START);
        setSize(300, 300);
        setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new MultiplePanels();
            }
        });
    }
}

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