在GroupLayout中设置JPanel的大小

Question

我有一个JFrame，我将布局设置为GroupLayout。

我正在添加两个Jpanel，即workingPanel（红色），backgroundPanel（绿色）。

我希望绿色面板的高度更低，例如50或60.i已将backgroundPanel的大小设置为50，但在将其添加到Jframe时，backgroundPanel的高度与workingPanel相同。

代码是`import javax.swing。; import java.awt。;

public class Home extends JFrame{

JButton b1;
JPanel workingPanel,backgroundPanel;

public Home(){

    new JFrame("Restaurant Billing");
    b1=new JButton("Hello");
    workingPanel=new JPanel(); 
    backgroundPanel=new JPanel();
    int maximumWidth=getContentPane().getWidth();
    backgroundPanel.setSize(maximumWidth,60);
    workingPanel.setBackground(Color.red); //workingpanel backgroundcolor is red
    backgroundPanel.setBackground(Color.green);//backgroundPanle backcolor is green
    //creating grouplayout and setting to mainframe
    GroupLayout layout=new GroupLayout(getContentPane());
    getContentPane().setLayout(layout);

    layout.setHorizontalGroup(
        layout.createParallelGroup()
        .addComponent(backgroundPanel)
        .addComponent(workingPanel)
    );
      layout.setVerticalGroup(
        layout.createSequentialGroup()
        .addComponent(backgroundPanel)
        .addComponent(workingPanel)

      );


    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}
public void launchFrame(){

    this.setVisible(true);
}
}

Plz帮帮我。

Answer 1

您应该查看原始的GroupLayout教程。你找到它here！

向下滚动到组件大小和可调整性它应该回答您的问题！你找到一个有限的代码here！这是 trashgod ！

的代码

Answer 2

尝试使用prefferedSize属性。

backgroundPanel.setPrefferedSize(maximumWidth,60);

Answer 3

要调整大小，我看了看类的属性，找不到任何东西，需要触发。最好的解决方案就是这样。

package groupleyaut;

import java.awt.EventQueue;
import javax.swing.JFrame;
import  javax.swing.JPanel;
import java.awt.BorderLayout;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class gfg {
`enter code here`private JFrame frame;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                gfg window = new gfg();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public gfg() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 807, 325);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel panel = new JPanel();
    panel.setBackground(Color.BLACK);
    frame.getContentPane().add(panel, BorderLayout.CENTER);

    JPanel panel_1 = new JPanel();
    panel_1.setPreferredSize(new Dimension(10, 100));

    JPanel panel_2 = new JPanel();
    panel_2.setPreferredSize(new Dimension(200, 50));
    GroupLayout gl_panel = new GroupLayout(panel);
    gl_panel.setHorizontalGroup(
        gl_panel.createParallelGroup(Alignment.LEADING)
            .addGroup(gl_panel.createSequentialGroup()
                .addContainerGap()
                .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, panel_1.getPreferredSize().width, GroupLayout.PREFERRED_SIZE)
                .addGap(64)
                .addComponent(panel_2, GroupLayout.PREFERRED_SIZE, 492, GroupLayout.PREFERRED_SIZE)
                .addContainerGap(166, Short.MAX_VALUE))
    );
    gl_panel.setVerticalGroup(
        gl_panel.createParallelGroup(Alignment.LEADING)
            .addGroup(gl_panel.createSequentialGroup()
                .addContainerGap()
                .addGroup(gl_panel.createParallelGroup(Alignment.LEADING)
                    .addComponent(panel_2, GroupLayout.PREFERRED_SIZE, 128, GroupLayout.PREFERRED_SIZE)
                    .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, panel_1.getPreferredSize().height, GroupLayout.PREFERRED_SIZE))
                .addGap(66))
    );
    panel_2.setLayout(null);

    JButton btnNewButton = new JButton("New button");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            panel_1.setPreferredSize(new Dimension(10, 200));
            GroupLayout gl_panel = new GroupLayout(panel);
            gl_panel.setHorizontalGroup(
                gl_panel.createParallelGroup(Alignment.LEADING)
                    .addGroup(gl_panel.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, panel_1.getPreferredSize().width, GroupLayout.PREFERRED_SIZE)
                        .addGap(64)
                        .addComponent(panel_2, GroupLayout.PREFERRED_SIZE, 492, GroupLayout.PREFERRED_SIZE)
                        .addContainerGap(166, Short.MAX_VALUE))
            );
            gl_panel.setVerticalGroup(
                gl_panel.createParallelGroup(Alignment.LEADING)
                    .addGroup(gl_panel.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(gl_panel.createParallelGroup(Alignment.LEADING)
                            .addComponent(panel_2, GroupLayout.PREFERRED_SIZE, 128, GroupLayout.PREFERRED_SIZE)
                            .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, panel_1.getPreferredSize().height, GroupLayout.PREFERRED_SIZE))
                        .addGap(66))
            );
            panel.setLayout(gl_panel);

        }
    });
    btnNewButton.setBounds(147, 42, 89, 23);
    panel_2.add(btnNewButton);
    panel.setLayout(gl_panel);


}

}