我将如何在 Java Swing 中创建响应式布局
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How would I create a responsive layout in Java Swing
提问by Jay Askren
I am displaying a list of key value pairs in a swing JPanel. The key is displayed in a JLabel and the Value is displayed in a JTextField. There is enough room on the panel to display 1 or 2 columns of the key value pairs depending on how big the parent JFrame is. I would like to display 2 columns of key value pairs unless the panel gets too small. Then I want to switch to one column. Is this possible in Swing without writing my own custom layout manager?
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 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。然后我想切换到一列。如果不编写自己的自定义布局管理器，这在 Swing 中是否可行？
Putting each key value pair on it's own panel and adding the panels to a Flow Layout would do what I want to do except that labels would not be aligned with each other and text fields would not align with each other so it would look terrible. Is there a better way to do this?
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，所以它看起来很糟糕。有一个更好的方法吗？
Edit:
编辑：
Here is what it would look like. If the panel is big enough, show two columns. Otherwise show one column.
这就是它的样子。如果面板足够大，则显示两列。否则显示一列。
2 Columns:
2 列：
Some Key _______________ Key 2 ________________
Another Key _______________ Yet Another Key ________________
Key 5 _______________ Key 6 ________________
1 Column
1 列
Some Key _______________
Key 2 _______________
Another Key _______________
Yet Another Key _______________
Key 5 _______________
Key 6 ________________
回答by splungebob
You could use your FlowLayout idea and still make the labels/textfields lineup. Add a strut to each key/value panel that's the size of your longest label to force the textfield out to the right the same amount on each panel. Something like:
您可以使用 FlowLayout 的想法并仍然制作标签/文本字段阵容。向每个键/值面板添加一个与最长标签大小相同的支柱，以强制将每个面板上的文本字段向右移出相同的数量。就像是：
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);
}
}
