java - 我将如何在 Java Swing 中创建响应式布局

Question

我在 swing JPanel 中显示键值对列表。键显示在 JLabel 中，值显示在 JTextField 中。面板上有足够的空间来显示 1 列或 2 列键值对，具体取决于父 JFrame 的大小。除非面板太小，否则我想显示 2 列键值对。然后我想切换到一栏。在不编写我自己的自定义布局管理器的情况下，这在 Swing 中是否可行？

将每个键值对放在它自己的面板上并将面板添加到 Flow Layout 会做我想做的事情，除了标签不会彼此对齐并且文本字段不会彼此对齐所以它看起来糟糕的。有更好的方法吗？

编辑:

这是它的样子。如果面板足够大，显示两列。否则显示一列。

2 列:

   Some Key _______________                Key 2 ________________ 
Another Key _______________      Yet Another Key ________________
      Key 5 _______________                Key 6 ________________

1 列

       Some Key _______________                
          Key 2 _______________ 
    Another Key _______________      
Yet Another Key _______________
          Key 5 _______________                
          Key 6 ________________

Answer 1

您可以使用您的 FlowLayout 想法并仍然制作标签/文本字段阵容。向每个键/值面板添加一个支柱，该面板的大小是最长标签的大小，以强制文本字段在每个面板上向右移动相同的数量。像这样的东西:

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

public class Test implements Runnable
{
  private String[] keys = {"One", "Twoooooo", "Three", "Four",
                           "Five", "Six", "Seven", "Eight",
                           "Nine", "Ten", "Eleven", "Twelve"};
  private String[] values = {"Apple", "Boy", "Cat", "Denmark",
                             "Elephant", "Foo", "Hello", "Igloo",
                             "Jug", "Kangaroo", "Lip", "Now"};

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

  public void run()
  {
    JPanel panel = new JPanel(new FlowLayout());
    GridBagConstraints gbc;
    JTextField textField = null;
    int maxWidth = 0;
    JLabel[] labels = new JLabel[keys.length];

    for (int i = 0; i < keys.length; i++)
    {
      labels[i] = new JLabel(keys[i]);
      maxWidth = Math.max(labels[i].getPreferredSize().width, maxWidth);
    }

    JPanel[] panels = new JPanel[keys.length];

    for (int i = 0; i < keys.length; i++)
    {
      panels[i] = new JPanel(new GridBagLayout());

      gbc = new GridBagConstraints();
      gbc.gridx = 0;
      gbc.gridy = 0;
      gbc.anchor = GridBagConstraints.EAST;
      gbc.insets = new Insets(1,1,1,1);
      panels[i].add(Box.createHorizontalStrut(maxWidth), gbc);

      gbc.gridy = 1;
      panels[i].add(labels[i], gbc);

      textField = new JTextField(10);
      textField.setText(values[i]);
      gbc.gridx = 1;
      panels[i].add(textField, gbc);

      panel.add(panels[i]);
    }

    JFrame frame = new JFrame("Test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(panel);
    frame.setSize(240, 400);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}