英文:
Swing GridBagLayout: centering a button on the second row
问题
我有这段显示标签、文本框和按钮的代码：
import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;public class Form extends JFrame implements ActionListener {private JLabel label = new JLabel("What's your name:");private JTextField field = new JTextField(15);private JButton button = new JButton("Send");public Form() {setTitle("Name Form");setLayout(new GridBagLayout());GridBagConstraints gbc = new GridBagConstraints();gbc.insets = new Insets(10, 10, 10, 1);gbc.anchor = GridBagConstraints.LINE_END;gbc.gridx = 0;gbc.gridy = 0;add(label, gbc);gbc = new GridBagConstraints();gbc.insets = new Insets(10, 10, 10, 10);gbc.fill = GridBagConstraints.HORIZONTAL;gbc.gridx = 1;gbc.gridy = 0;add(field, gbc);gbc = new GridBagConstraints();gbc.insets = new Insets(10, 10, 10, 10);gbc.anchor = GridBagConstraints.LINE_END;gbc.gridx = 0;gbc.gridy = 1;add(button, gbc);}@Overridepublic void actionPerformed(ActionEvent event) {}public static void main(String[] args) {Form myFrame = new Form();myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);myFrame.pack();myFrame.setVisible(true);}}
它显示如下：
我希望按钮水平居中，效果如下：
如何使用 GridBagLayout 实现这一点？我尝试了不同的 anchor 值，但没有效果。
编辑：
添加 gbc.gridwidth = 2 后效果如下：
英文:
I have this code that displays a label, a textfield and a button:
import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;public class Form extends JFrame implements ActionListener {private JLabel label = new JLabel("What's your name:");private JTextField field = new JTextField(15);private JButton button = new JButton("Send");public Form() {setTitle("Name Form");setLayout(new GridBagLayout());GridBagConstraints gbc = new GridBagConstraints();gbc.insets = new Insets(10, 10, 10, 1);gbc.anchor = GridBagConstraints.LINE_END;gbc.gridx = 0;gbc.gridy = 0;add(label, gbc);gbc = new GridBagConstraints();gbc.insets = new Insets(10, 10, 10, 10);gbc.fill = GridBagConstraints.HORIZONTAL;gbc.gridx = 1;gbc.gridy = 0;add(field, gbc);gbc = new GridBagConstraints();gbc.insets = new Insets(10, 10, 10, 10);gbc.anchor = GridBagConstraints.LINE_END;gbc.gridx = 0;gbc.gridy = 1;add(button, gbc);}@Overridepublic void actionPerformed(ActionEvent event) {}public static void main(String[] args) {Form myFrame = new Form();myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);myFrame.pack();myFrame.setVisible(true);}}
It shows this:
I need the button to be horizontally centered like this:
How do I do this with GridBagLayout? I tried different values for anchor but nothing worked.
EDIT:
Adding gbc.gridwidth = 2 showed this:
答案1
得分: 2
按钮需要跨越两列，因此设置 gridwidth。
gbc.gridwidth = 2;
（顺便说一下，你不需要为每个组件创建一个新的 GridBagConstraints。只需重用同一个，然后只更改不同的属性。）
英文:
The button needs to stretch over the two columns, so set the gridwidth.
gbc.gridwidth = 2;
(Btw, you don't need to create a new GridBagConstraints for each component. Just reuse the say one and only change the properties that are different.)
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