我已经尝试在代码中尽可能地简化它。我已经使用 GridBagLayout 很长时间了,由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 最终在屏幕中央呈正方形。我怎样才能让它到达顶部?我看过How To Use GridBagLayout 。我被难住了...
最佳答案
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 的工作方式如广告所示:
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
}
}
关于Java Swing 的 GridBagLayout 不会将组件定位在网格单元的顶部,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18496086/