根据 JFrame 的大小更改 JPanel 组件的大小

Question

In most of the GUI programs, when the user resizes it, the components of the program, such as text fields, buttons, etc. tend to increase or decrease their size depending on the decisions of the user. I'm trying to implement this idea into my GUI program. I'm a little bit lost about how I can do it. By the way, I created my program without the usage/help of the Eclipse Swing or Netbeans' GUI.

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

public class CodeReviewerFrame extends JFrame {
    EditorAreaPanel display = new EditorAreaPanel();
    // FileOptionsPanel fileOptionsPanel = new FileOptionsPanel( display );
    JPanel p = new JPanel();
    JPanel panel = new JPanel();

    public CodeReviewerFrame(String title) throws IOException {

        super(title);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(1500, 1000));

        setLayout(new BorderLayout());

        ImageIcon img = new ImageIcon("icon.png");
        setIconImage(img.getImage());

        p.setLayout(new BorderLayout());
        p.add(new HomeOptionsPanel(display), BorderLayout.LINE_START);
        p.add(new NewCommentPanel(display), BorderLayout.CENTER);
        p.add(new CommentOptionsPanel(display), BorderLayout.LINE_END);
        add(p, BorderLayout.PAGE_START);

        panel.setLayout(new BorderLayout());
        panel.add(new FileExplorerPanel(), BorderLayout.LINE_START);
        panel.add(new FileOptionsPanel(display), BorderLayout.CENTER);
        panel.add(new CommentShowPanel(display), BorderLayout.LINE_END);
        add(panel, BorderLayout.CENTER);

        pack();
        setResizable(true);
        setVisible(true);

        /**
         * Everything Under This is experimental
         */
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.gridx = 0;
        constraints.gridy = 0;
        //add ( fileOptionsPanel, constraints );
    }
}

There are components on each Panel that have been added, such as buttons in HomeOptionsPanel, huge JTextArea in the center of FileOptionsPanel plus four buttons up on the JTextArea, etc. Should I use new Layout type, or commands known as "repaint/revalidate," or implement changeListener? And should I only implement the code to the JFrame, or do it for each of the JPanels?

Answer 1

The behaviour of your UI upon window resizing depends (also) on the Layout Manager you are using.

Some Layout Managers (like BorderLayout ) resize the components when the windows is resized, while others (like FlowLayout ) don't.

It is not clear what LM you are using inside your panels, but most likely your issue stands in there.