Resizing the JDialog only width not height

[Chiranjeevi Kanthraj]

Hi All

I want to make a JDailog, which can be resizable
But only Width not Height.

How can we do this?

[Darryl Burke]

Here's one way:

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

public class WidthResizeableDialog {

  Robot robot;
  static final int HEIGHT = 400;
  Point lastLocation;

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

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

  public void makeUI() {
    try {
      robot = new Robot();
    } catch (AWTException ex) {
      ex.printStackTrace();
    }
    final JDialog dialog = new JDialog();
    dialog.setSize(400, HEIGHT);
    dialog.setLocationRelativeTo(null);
    dialog.addWindowListener(new WindowAdapter() {

      @Override
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    dialog.addComponentListener(new ComponentAdapter() {

      @Override
      public void componentMoved(ComponentEvent e) {
        SwingUtilities.invokeLater(new Runnable() {

          @Override
          public void run() {
            lastLocation = dialog.getLocation();
          }
        });
      }
    });
    dialog.getRootPane().addComponentListener(new ComponentAdapter() {

      @Override
      public void componentResized(ComponentEvent e) {
        int height = dialog.getHeight();
        if (robot != null && height != HEIGHT) {
          robot.mouseRelease(InputEvent.BUTTON1_MASK);
          dialog.setLocation(lastLocation);
          dialog.setSize(dialog.getWidth(), HEIGHT);
        }
      }
    });
    dialog.setVisible(true);
  }
}

Feel free to ask if there's anything you don't understand about the approach.