java jpanel grouplayout格式化问题

Question

我正在尝试布局我的jpanel，以使：

• 信息标签位于顶部，
• 区域直接下面
• 文本 从左到右（均等）是配置，保存，然后是清除按钮，
• 下面是成功/故障标签（中央，保存按钮下方）和主页按钮（右，在“清除”按钮下）。

我尝试了许多组合，并使用了其他堆栈答案，但无法正确解决，这是关于团体布局的，我无法抓住我的头！

import javax.swing.*;

public class JFrameTest {
    private static JFrame mainApp;
    private static JPanel mainPanel;

public JFrameTest() {
        mainApp = new JFrame("Application");
        mainApp.setSize(640, 480);
        mainApp.setLocationRelativeTo(null);
        mainApp.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mainApp.add(mainPanel());
        mainApp.setVisible(true);
    }

    private JPanel mainPanel() {
        JFrame.setDefaultLookAndFeelDecorated(true);
        mainPanel= new JPanel();
        mainPanel.setSize(600,450);
        Container container = mainApp.getContentPane();
        
        JLabel labelInfo = new JLabel("add necessary information here");
        JLabel labelSOrF = new JLabel("Success/Failure");
        //    labelSOrF.setVisible(false);

        JTextArea textArea = new JTextArea();

        JButton configButton= new JButton("config");
        JButton saveButton= new JButton("save");
        JButton clearButton= new JButton("clear");
        JButton homeButton= new JButton("Home");

        GroupLayout layout = new GroupLayout(container);
        container.setLayout(layout);
        layout.setAutoCreateGaps(true);
        layout.setAutoCreateContainerGaps(true);

        layout.setHorizontalGroup(
                layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup()
                            .addComponent(configButton)
                    .addGroup(layout.createParallelGroup()
                            .addComponent(saveButton)
                            .addComponent(labelSOrF, 0, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createParallelGroup()
                            .addComponent(clearButton)
                            .addComponent(homeButton)
                    .addComponent(labelInfo)
                    .addComponent(textArea, 0, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    )))
        );
        layout.setVerticalGroup(
                layout.createSequentialGroup()
                    .addComponent(labelInfo)
                    .addComponent(textArea, 0, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createParallelGroup()
                            .addGroup(layout.createSequentialGroup()
                                    .addComponent(configButton)
                                    .addComponent(saveButton)
                                    .addComponent(buttonClear))
                    .addGroup(layout.createParallelGroup()
                            .addComponent(labelSOrF, 0, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(homeButton)))
        );

编辑 - 添加代码

Answer 1

Oracle有一个有用的教程，创建带有swing 的GUI。使用Netbeans IDE部分跳过学习秋千。

Grouplayout是为GUI建造者设计的。没有人会故意使用杂种。它太难理解，并且您发现，维护。

这是满足您要求的GUI。

秋千设计为从内而外构建。您将摆动组件布局，然后让jpanels和jframe大小本身。您不会从Jframe开始，并适合所有秋千组件。

所有秋千应用程序必须启动，呼叫swingutilities InvokeLater方法。 This method ensures that the Swing components are created and executed on the Event Dispatch Thread 。

我用三个下属JPanels创建了一个主JPANEL。要构建复杂的GUI，您可以嵌套简单JPANELS。

我在列，行顺序中将秋千组件添加到每个jpanel中。这有助于我组织代码，并使代码的读者更容易理解代码。

这是完整的可运行代码。

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

public class JFrameTest implements Runnable {

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

    @Override
    public void run() {
        JFrame mainApp = new JFrame("Application");
        mainApp.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        mainApp.add(createMainPanel(), BorderLayout.CENTER);

        mainApp.pack();
        mainApp.setLocationRelativeTo(null);
        mainApp.setVisible(true);
    }

    private JPanel createMainPanel() {
        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
        
        panel.add(createTitlePanel());
        panel.add(createTextAreaPanel());
        panel.add(createButtonPanel());

        return panel;
    }

    private JPanel createTitlePanel() {
        JPanel panel = new JPanel(new FlowLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        JLabel labelInfo = new JLabel("add necessary information here");
        panel.add(labelInfo);

        return panel;
    }

    private JPanel createTextAreaPanel() {
        JPanel panel = new JPanel(new FlowLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        JTextArea textArea = new JTextArea(5, 40);
        JScrollPane scrollPane = new JScrollPane(textArea);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        panel.add(scrollPane);

        return panel;
    }

    private JPanel createButtonPanel() {
        JPanel panel = new JPanel(new GridLayout(0, 3, 20, 5));
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        JButton configButton = new JButton("config");
        panel.add(configButton);

        JButton saveButton = new JButton("save");
        panel.add(saveButton);

        JButton clearButton = new JButton("clear");
        panel.add(clearButton);
        
        JLabel dummy = new JLabel(" ");
        panel.add(dummy);

        JLabel labelSOrF = new JLabel("Success/Failure");
        panel.add(labelSOrF);

        JButton homeButton = new JButton("Home");
        panel.add(homeButton);

        return panel;
    }

}