java - Java Swing 的 GridBagLayout 不会将组件定位在网格单元的顶部

Question

我试图在代码中尽可能地简化这一点。我已经使用 GridBagLayout 很长时间了，出于某种原因，我从未遇到过这种情况。

JDialog dialog = new JDialog();
dialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
dialog.setResizeable(true);

JPanel guiHolder = new JPanel();
guiHolder.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.PAGE_START;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
guiHolder.add(new JLabel("my test"), gbc);

dialog.add(guiHolder);
dialog.setSize(new Dimension(320, 240);
dialog.setSize(true);

JLabel 最终在屏幕中心呈正方形。我怎样才能让它到达顶部？我看过如何使用 GridBagLayout。我被难住了……

Answer 1

如果您修复了编译错误并将代码包装到可运行的演示中，您会看到 GridBagLayout 像宣传的那样工作：

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

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

  public void run()
  {
    JDialog dialog = new JDialog();
    dialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    dialog.setResizable(true);  // fixed mispelling here

    JPanel guiHolder = new JPanel();
    guiHolder.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.anchor = GridBagConstraints.PAGE_START;
    gbc.weightx = 1.0;
    gbc.weighty = 1.0;
    guiHolder.add(new JLabel("my test"), gbc);

    dialog.add(guiHolder);
    dialog.setSize(new Dimension(320, 240));
    dialog.setVisible(true);  // fixed wrong method name here
  }
}