java 在一个框架中使用多个面板
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时间：2020-10-31 22:15:27 来源:igfitidea点击:
Working with multiple panels in one frame
提问by user2319690
I have a problem where i want a program to switch between multiple panels in a same frame. The problems I am encountering are that i can't set the layout when the panels switch and after the switch content is lowering pixel by pixel. Here is my code.
我有一个问题，我想要一个程序在同一帧中的多个面板之间切换。我遇到的问题是，当面板切换时以及切换内容逐像素降低后，我无法设置布局。这是我的代码。
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import javax.swing.JFrame;
public class Main {
public static boolean logged_in = false;
public static int width = 200, height = 400;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Dimension d = new Dimension(width, height);
First frame = new First();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(d);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setResizable(true);
frame.setLayout(new FlowLayout());
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
and here are the two classes that hold frames.
这是保存帧的两个类。
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class First extends JFrame {
JPanel contentPane;
private JButton button_1;
private JTextField text;
public First(){
contentPane = new JPanel();
setContentPane(contentPane);
button_1 = new JButton("Second frame");
button_1.setVisible(true);
text = new JTextField(20);
text.setVisible(true);
contentPane.add(button_1);
contentPane.add(text);
thehandler handler = new thehandler();
button_1.addActionListener(handler);
}
private class thehandler implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource() == button_1) {
contentPane.removeAll();
contentPane.invalidate();
Second frame = new Second();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setResizable(true);
frame.setLayout(new FlowLayout());
frame.contentPane.setVisible(true);
contentPane.add(frame.contentPane);
((JPanel) contentPane).revalidate();
contentPane.setSize(200, 400);
contentPane.repaint();
}
}
}
}
and the second one
第二个
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Second extends JFrame {
JPanel contentPane;
private JButton button_1;
private JTextField text;
public Second(){
contentPane = new JPanel();
setContentPane(contentPane);
button_1 = new JButton("First frame");
button_1.setVisible(true);
text = new JTextField(20);
text.setVisible(true);
contentPane.add(button_1);
contentPane.add(text);
thehandler handler = new thehandler();
button_1.addActionListener(handler);
}
private class thehandler implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource() == button_1) {
contentPane.removeAll();
contentPane.invalidate();
First frame = new First();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setResizable(true);
frame.setLayout(new FlowLayout());
frame.contentPane.setVisible(true);
contentPane.add(frame.contentPane);
((JPanel) contentPane).revalidate();
contentPane.setSize(200, 400);
contentPane.repaint();
}
}
}
}
Any help is appreciated. Please keep in mind I am not so good with java GUI. Ty.
任何帮助表示赞赏。请记住，我对 Java GUI 不太擅长。泰。
EDITAfter a lot of time searching for an answer i got one. It probably isn't perfect but i will post it for future reference or if anyone else needs this solution. Here is the code.
编辑经过大量时间寻找答案后，我得到了一个答案。它可能并不完美，但我会将其发布以供将来参考，或者如果其他人需要此解决方案。这是代码。
Main frame that holds panels:
固定面板的主框架：
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainFrame extends JFrame {
public static JPanel main_panel;
private static FirstFrame first;
public MainFrame(){
setLayout(null);
setSize(400, 400);
setLocationRelativeTo(null);
setResizable(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
main_panel = new JPanel();
main_panel.setBounds(0, 0, 400, 400);
add(main_panel);
main_panel.invalidate();
main_panel.removeAll();
first = new FirstFrame();
main_panel.add(first);
main_panel.revalidate();
main_panel.repaint();
}
public static void main(String[] args) {
MainFrame frame = new MainFrame();
frame.setVisible(true);
}
}
First panel:
第一个面板：
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
public class FirstFrame extends JPanel {
private JButton button;
public FirstFrame() {
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(400, 400));
panel.setLayout(null);
button = new JButton("First");
button.setBounds(20, 20, 200, 40);
button.setVisible(true);
thehandler handler = new thehandler();
button.addActionListener(handler);
panel.add(button);
add(panel);
revalidate();
repaint();
}
private class thehandler implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource() == button) {
MainFrame.main_panel.invalidate();
MainFrame.main_panel.removeAll();
SecondFrame frame = new SecondFrame();
MainFrame.main_panel.add(frame);
MainFrame.main_panel.revalidate();
MainFrame.main_panel.repaint();
}
}
}
}
Second:
第二：
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
public class SecondFrame extends JPanel {
private JButton button;
public SecondFrame() {
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(400, 400));
panel.setLayout(null);
button = new JButton("Second");
button.setBounds(20, 20, 200, 40);
button.setVisible(true);
thehandler handler = new thehandler();
button.addActionListener(handler);
panel.add(button);
add(panel);
revalidate();
repaint();
}
private class thehandler implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource() == button) {
MainFrame.main_panel.invalidate();
MainFrame.main_panel.removeAll();
ThirdFrame frame = new ThirdFrame();
MainFrame.main_panel.add(frame);
MainFrame.main_panel.revalidate();
MainFrame.main_panel.repaint();
}
}
}
}
And third:
第三：
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
public class ThirdFrame extends JPanel {
private JButton button;
public ThirdFrame() {
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(400, 400));
panel.setLayout(null);
button = new JButton("Third");
button.setBounds(20, 20, 200, 40);
button.setVisible(true);
thehandler handler = new thehandler();
button.addActionListener(handler);
panel.add(button);
add(panel);
revalidate();
repaint();
}
private class thehandler implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource() == button) {
MainFrame.main_panel.invalidate();
MainFrame.main_panel.removeAll();
FirstFrame frame = new FirstFrame();
MainFrame.main_panel.add(frame);
MainFrame.main_panel.revalidate();
MainFrame.main_panel.repaint();
}
}
}
}
As you can see you can switch from panel 1 ->2 ->3 and back to 1 but not the second one. Ty all for your answers they were helpful. Any further suggestions are welcome.
如您所见，您可以从面板 1 ->2 ->3 切换回 1，但不能切换到第二个面板。Ty all 对于您的回答，他们很有帮助。欢迎任何进一步的建议。
回答by Sridhar
The solution is to use card layout. It is very simple,
解决方案是使用卡片布局。这很简单，
- create a panel with card layout in which other children panels added with unique string reference.
- invoke
showmethod of CardLayout to pick a panel to take in front (docs)
- 创建一个带有卡片布局的面板，其中其他子面板添加了唯一的字符串引用。
- 调用
showCardLayout 的方法来选择要放在前面的面板 ( docs)
Check the following code.
检查以下代码。
final JPanel mainPanel=new JPanel();
JPanel panelOne=new JPanel();
JPanel panelTwo=new JPanel();
final CardLayout card=new CardLayout();
mainPanel.setLayout(card);
mainPanel.add(panelOne, "one"); // id one refers panelOne
mainPanel.add(panelTwo, "two"); // id two refers panelTwo
panelOne.add(new JLabel("first panel"));
JButton btn1=new JButton("Show second");
panelOne.add(btn1);
btn1.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent ae){
card.show(mainPanel, "two"); // shows panelTwo
}});
panelTwo.add(new JLabel("second panel"));
JButton btn2=new JButton("Show First");
panelTwo.add(btn2);
btn2.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent ae){
card.show(mainPanel, "one"); // shows panelOne
}});
