java - 如何调整 JPanel 的大小以适应 "docknorth"中的 JFrame 而不会干扰剩余的 JPanel

Question

我正在对演示 Swing GUI 进行一些测试。在此演示中，JFrame 由 3 个“master”JPanel 组成。如果您愿意，第一个 (jp1) 由 JLabel 组成，另外两个由其他几个 JPanel 组成。我正在使用 MigLayout。

这是我的示例代码:

    // All the jPanels  
    JFrame frame = new JFrame();
    frame.setLayout(new MigLayout());
    JPanel jp1 = new JPanel();
    jp1.setLayout(new MigLayout());
    jp1.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
    JPanel jp2 = new JPanel();
    jp2.setLayout(new MigLayout());
    jp2.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
    JPanel jp3 = new JPanel();
    jp3.setLayout(new MigLayout());
    jp3.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
    JPanel jp4 = new JPanel();
    jp4.setLayout(new MigLayout());
    jp4.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
    JPanel jp5 = new JPanel();
    jp5.setLayout(new MigLayout());
    jp5.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
    JPanel jp6 = new JPanel();
    jp6.setLayout(new MigLayout());
    jp6.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
    JPanel jp7 = new JPanel();
    jp7.setLayout(new MigLayout());
    jp7.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));

    JPanel bigPanel1 = new JPanel();
    bigPanel1.setLayout(new MigLayout());
    bigPanel1.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));

    JPanel bigPanel2 = new JPanel();
    bigPanel2.setLayout(new MigLayout());
    bigPanel2.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
    //All the labels to be added to JPanel jp1
    JLabel label1 = new JLabel();
    label1.setText("LABEL1");
    JLabel label2 = new JLabel();
    label2.setText("LABEL2");
    JLabel label3 = new JLabel();
    label3.setText("LABEL3");
    JLabel label4 = new JLabel();
    label4.setText("LABEL4");
    jp1.add(label1);
    jp1.add(label2);
    jp1.add(label3);
    jp1.add(label4,"wrap");
    bigPanel1.add(jp2);
    bigPanel1.add(jp6);
    bigPanel1.add(jp3,"grow,wrap");
    bigPanel2.add(jp4);
    bigPanel2.add(jp7);
    bigPanel2.add(jp5,"grow,wrap");
    frame.getContentPane().add(jp1,"dock north, wrap");
    frame.getContentPane().add(bigPanel1,"span,grow,wrap");
    frame.getContentPane().add(bigPanel2,"span,grow,wrap");
    frame.pack();
    frame.setVisible(true);

结果为:GUI OUTPUT

我想要实现的是能够将标签添加到第一个 JPanel (jp1) 而不会弄乱剩余的 JPanel 的宽度.此外，我想让 bigPanel 中的几个 JPanel 占据它的整个宽度，以及 jp2、jp6 和 jp3 填充 bigPanel1。

我应该怎么做？提前致谢。

Answer 1

我从未使用过MigLayout，个人不明白是否可以使用默认 java LayoutManager 来完成的原因。

好的，所以我结合使用了 FlowLayout 和 GridBagLayout为了实现这一点，对于那些我们不想填充 contentpane 宽度，也根据您的评论更新以阻止 JPanel/JFrame 在更多 JLabel 时变得大于给定的最大宽度添加这是使用 JScrollPane 完成的:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;

public class Test {

    public Test() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.setLayout(new GridBagLayout());

        final JPanel labelPanel = new JPanel();
        labelPanel.setBorder(new LineBorder(Color.black));
        for (int i = 0; i < 5; i++) {
            labelPanel.add(new JLabel("Label" + (i + 1)));
        }

        final int maxWidth = 200;
        final JScrollPane jsp = new JScrollPane(labelPanel) {
            @Override
            public Dimension getPreferredSize() {
                //we set the height by checking if we exceeed the wanted ith thus a scrollbar will appear an we must incoprate that or labels wont be shpwn nicely
                return new Dimension(maxWidth, labelPanel.getPreferredSize().width < maxWidth ? (labelPanel.getPreferredSize().height + 5) : ((labelPanel.getPreferredSize().height + getHorizontalScrollBar().getPreferredSize().height) + 5));
            }
        };

        JPanel otherPanel = new JPanel();
        otherPanel.add(new JLabel("label"));
        otherPanel.setBorder(new LineBorder(Color.black));

        JPanel otherPanel2 = new JPanel();
        otherPanel2.add(new JLabel("label 1"));
        otherPanel2.add(new JLabel("label 2"));
        otherPanel2.setBorder(new LineBorder(Color.black));

        GridBagConstraints gc = new GridBagConstraints();

        gc.fill = GridBagConstraints.BOTH;
        gc.weightx = 1.0;
        gc.weighty = 1.0;
        gc.gridx = 0;
        gc.gridy = 0;
        frame.add(jsp, gc);

        gc.fill = GridBagConstraints.NONE;
        gc.anchor = GridBagConstraints.WEST;
        gc.gridy = 1;
        frame.add(otherPanel, gc);
        gc.anchor = GridBagConstraints.WEST;
        gc.gridy = 2;
        frame.add(otherPanel2, gc);

        frame.pack();
        frame.setVisible(true);
        frame.revalidate();
        frame.repaint();
    }

    public static void main(String[] args) {
        //Create Swing components on EDT
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Test();
            }
        });
    }
}