什么是在JPanel中水平和垂直居中对象的最佳方法

Question

我正在尝试在panelMain的左侧添加一个面板p1。由于对象不是垂直居中，我试图在p2上添加p1，它具有BorderLayout。我想这不是一个好方法，但它甚至不起作用。我没有使用GridLayout，因为我不希望对象填满整个JPanel。

JPanel panelMain = new JPanel( new BorderLayout() );

JPanel p1 = new JPanel( new FlowLayout(FlowLayout.CENTER) );
panelText.setPreferredSize( new Dimension( 250, frame.getHeight() ) );
panelText.add( new JLabel( "Name:", SwingConstants.RIGHT) );
panelText.add( new JTextField( "First Last:", 15 ) );
panelText.add( new JLabel( " Tel:", SwingConstants.RIGHT) );
panelText.add( new JTextField( "000-000-0000", 15) );

JPanel p2 = new JPanel( new BorderLayout() );
p2.add( p1, BorderLayout.CENTER );

panelMain.add( p2,BorderLayout.WEST );

Answer 1

  

“在JPanel中水平和垂直居中对象的最佳方法是什么”

您可以将所有内容打包在JPanel中，然后将 JPanel JPanel包裹在另一个GridBagLayout <{1}}

中

JPanel mainPanel = your main panel
JPanel wrapperPanel = new JPanel(new GridBagLayout());
wrapperPanel.add(mainPanel);
frame.add(wrapperPanel);

示例

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

public class TestCenterGridbagLayout {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                JPanel mainPanel = new JPanel(new GridLayout(3, 3));
                for (int i = 0; i < 9; i++) {
                    mainPanel.add(new JButton("Button"));
                }
                mainPanel.setBorder(new TitledBorder("Main Panel"));

                JPanel wrapperPanel = new JPanel(new GridBagLayout());
                wrapperPanel.setPreferredSize(new Dimension(350, 300));
                wrapperPanel.add(mainPanel);
                wrapperPanel.setBorder(new TitledBorder("Wrapper panel with GridbagLayout"));

                JOptionPane.showMessageDialog(null, wrapperPanel);

            }
        });
    }
}