GridBagLayout布局

package org.example.blog;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;

public class GridBagLayoutDemo {
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("GridBagLayoutDemo");

                JPanel wrapPane = new JPanel();
                wrapPane.setLayout(new BoxLayout(wrapPane, BoxLayout.Y_AXIS));
                wrapPane.setBorder(new EmptyBorder(5, 5, 5, 5));
                JScrollPane contentPane = new JScrollPane(wrapPane);
                contentPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
                contentPane.getVerticalScrollBar().setUnitIncrement(30);

                JPanel settingPanel = new JPanel();
                settingPanel.setLayout(new GridBagLayout());
                GridBagConstraints constraints = new GridBagConstraints();
                constraints.anchor = GridBagConstraints.WEST;
                constraints.fill = GridBagConstraints.NONE;
                constraints.insets = new Insets(5, 5, 5, 5);

                JLabel urlLabel = new JLabel("URL:");
                constraints.gridx = 0;
                constraints.gridy = 0;
                settingPanel.add(urlLabel, constraints);

                JTextField urlField = new JTextField();
                constraints.gridx = 1;
                constraints.weightx = 1.0;
                constraints.fill = GridBagConstraints.HORIZONTAL;
                settingPanel.add(urlField, constraints);

                JLabel apiKeyLabel = new JLabel("API KEY:");
                constraints.gridx = 0;
                constraints.gridy = 1;
                constraints.weightx = 0.0;
                settingPanel.add(apiKeyLabel, constraints);

                JTextField apiKeyField = new JTextField();
                constraints.gridx = 1;
                constraints.weightx = 1.0;
                constraints.fill = GridBagConstraints.HORIZONTAL;
                settingPanel.add(apiKeyField, constraints);

                settingPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
                settingPanel.setMaximumSize(new Dimension(300, settingPanel.getPreferredSize().height));
                wrapPane.add(settingPanel);

                frame.setContentPane(contentPane);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setSize(new Dimension(600, 360));
                frame.setVisible(true);
            }
        });
    }
}
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