Resizing a JButton during execution

Hello. I have problems with a JButton resizing during execution. I can set the size of a JButton in my JFrame constructor. However, when I try to change via an ActionListener has defined the JButton even nothing happens. I tried to call invalidate() on the JButton and the JPanel that contains nothing will do. Any help to fix this would be appreciated. Below the source code.

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

public class framebuild extends JFrame
{
     JButton button1, button2;
     JLabel label;
     JPanel labelPanel = new JPanel();
     JPanel buttonPanel = new JPanel();
     
     public framebuild()
     {
          super("Error");
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          setPreferredSize(new Dimension(300,300));
          setLayout(new BorderLayout());
          setResizable(true);
          
          clickresponse responder = new clickresponse();
          
          label = new JLabel("Resize button?");
          button1 = new JButton("OK");
          button1.addActionListener(responder);
          button2 = new JButton("Cancel");
          button2.addActionListener(responder);
          
          
          labelPanel.add(label);
          
          buttonPanel.add(button1);
          buttonPanel.add(button2);
          
          add(labelPanel, BorderLayout.CENTER);
          add(buttonPanel, BorderLayout.SOUTH);
     }
     
     private class clickresponse implements ActionListener
     {
          public void actionPerformed(ActionEvent e)
          {
               if( button1 == e.getSource() )
               {
                    button1.setPreferredSize(new Dimension(100,100));
                    button1.invalidate();
               }
               else
                    System.exit(0);
          }
     }
     
     public static void main( String[] args )
     {
          framebuild frame = new framebuild();
          frame.pack();
          frame.setVisible(true);
     }

}

First of all, a few notes on your code.

By convention, Java class names start with a capital letter and the first letter of each internal Word is capitalized. FrameBuild, no framebuild and ClickResponse, not clickresponse.

It is usually seen on evil as a diversion from the legacy of needlessly extend a class. Your class could contain a JFrame rather than extend the JFrame.

All Swing components should always be created and modified on the EDT and only on the EDT.

When you make changes that affect the provision of an already visible from container, you must call, ( revalidate() and repaint()sometims) on the container.

//button1.invalidate();
buttonPanel.revalidate();

Edit

Avoid the 'standard' listeners who need to identify the source of the event to determine what steps to take. Soon, they develop little handy in any real application.

Here is the summary of my recommendations, adapted from your code.

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

public class FrameBuild {

  JButton button1, button2;
  JLabel label;
  JPanel labelPanel = new JPanel();
  JPanel buttonPanel = new JPanel();

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

      @Override
      public void run() {
        new FrameBuild().makeUI();
      }
    });
  }

  public void makeUI() {
    label = new JLabel("Resize button?");
    labelPanel.add(label);

    button1 = new JButton("OK");
    button1.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        button1.setPreferredSize(new Dimension(100, 100));
        buttonPanel.revalidate();
      }
    });

    button2 = new JButton("Cancel");
    button2.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        System.exit(0);
      }
    });

    buttonPanel.add(button1);
    buttonPanel.add(button2);

    JFrame frame = new JFrame("Error");
    frame.add(labelPanel, BorderLayout.CENTER);
    frame.add(buttonPanel, BorderLayout.SOUTH);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300, 300);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}

Published by: Darryl Burke

Tags: Java

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