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我正在尝试像这样放置 JLabel 和 JTextfield，

      First Name       Textbox        -> First Name is a label named as lblFirstname
      Last Name        Textbox        TextBox is JTextField

尝试使用 GridBagLayout，

应用的约束是，

      lblFirstNameCons.gridx = 0;
      lblLastNameCons.gridy = 0;

      txtFirstName.gridx = 0;
      txtLastNameCons.gridy = 3;

我得到这样的输出，

      First NameTextbox  -> There is no space and also, the JTextField is almost invisible.
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2 回答 2

2

布局应该是这样的。括号中的值是 gridx 和 gridy (grix, gridy)：

First Name (0, 0)       Textbox (1, 0)
Last Name  (0, 1)       Textbox (1, 1)
于 2012-09-14T07:37:46.927 回答
1
  1. 您应该确保将 GridBagConstraint 的填充属性设置为文本字段的水平，并确保将 weightx 设置为大于 0 的值
  2. 或者您可以向文本字段指示要显示的所需列数（这最终会影响文本字段的首选大小）。

这是一个示例，表明：

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.net.MalformedURLException;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class TestGridBagLayout {

    protected void initUI() throws MalformedURLException {
        final JFrame frame = new JFrame();
        frame.setTitle(TestGridBagLayout.class.getSimpleName());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final JPanel panel = new JPanel(new GridBagLayout());
        JLabel firstName = new JLabel("First name:");
        JLabel lastName = new JLabel("Last name:");
        JTextField firstNameTF = new JTextField();
        JTextField lastNameTF = new JTextField();
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(3, 3, 3, 3);
        gbc.weightx = 0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.CENTER;
        panel.add(firstName, gbc);
        gbc.weightx = 1;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        panel.add(firstNameTF, gbc);
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        panel.add(lastName, gbc);
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.weightx = 1;
        panel.add(lastNameTF, gbc);
        frame.add(panel);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    new TestGridBagLayout().initUI();
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                }
            }
        });
    }

}
于 2012-09-14T08:30:55.007 回答