Resizing of Jbutton when we drag the button

Question

Hi ,
I want to resize the button dynamically when we drag the edge of the button.Is it possible in swing.Can you
please send me the sample code.
Thanking you,
with regards,
Revathi

Answer 1

Hi Revathi,
Here is a sample test code you can execute directly :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.basic.*;
import javax.swing.plaf.*;
import javax.swing.border.*;
public class MyFrame extends JFrame {
     public static String windowsUI = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
     private static final Cursor horizontalCursor = new Cursor(Cursor.W_RESIZE_CURSOR);
     private static final Cursor verticalCursor = new Cursor(Cursor.S_RESIZE_CURSOR);
     private static final Cursor defaultCursor = new Cursor(Cursor.DEFAULT_CURSOR);
     public MyFrame() {
          super("My Frame");
          setWindowsLF();
          addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent e) {
                    System.exit(0);
          setBounds(312,250,412,200);
          Container c = getContentPane();
          c.setLayout(null);     // very important
          JButton b1 = new JButton("button", new ImageIcon("save.gif"));
          c.add(b1);
          b1.setBounds(10,10,100,50);
          new ButtonResizeListener(b1);
          JToggleButton b2 = new JToggleButton("toggle", new ImageIcon("save.gif"));
          c.add(b2);
          b2.setBounds(120,10,100,50);
          new ButtonResizeListener(b2);
          setVisible(true);
     final class ButtonResizeListener extends MouseInputAdapter {
          private int selectedEdge = 0;
          private JComponent component;
          private Rectangle bounds;
          public ButtonResizeListener(JComponent component) {//can't be shared my several components
               this.component = component;
               component.addMouseListener(this);
               component.addMouseMotionListener(this);
          private final void getCursor(Point p) {
               double x = p.getX();
               double y = p.getY();
               bounds = component.getBounds();
               if (x<3) {
                    component.setCursor(horizontalCursor);
               else
               if (x>bounds.getWidth()-4) {
                    component.setCursor(horizontalCursor);
               else
               if (y<3) {
                    component.setCursor(verticalCursor);
               else
               if (y>bounds.getHeight()-4) {
                    component.setCursor(verticalCursor);
               else {
                    component.setCursor(defaultCursor);
          private int getEdge(Point p) {
               int edge = 0;
               double x = p.getX();
               double y = p.getY();
               bounds = component.getBounds();
               if (x<3) {
                    edge = 1;
                    component.setCursor(horizontalCursor);
               else
               if (x>bounds.getWidth()-4) {
                    edge = 3;
                    component.setCursor(horizontalCursor);
               else
               if (y<3) {
                    edge = 2;
                    component.setCursor(verticalCursor);
               else
               if (y>bounds.getHeight()-4) {
                    edge = 4;
                    component.setCursor(verticalCursor);
               else {
                    component.setCursor(defaultCursor);
               return(edge);
          private void moveTo(int edge, Point dir) {
               Point dir2 = SwingUtilities.convertPoint(component, dir, component.getParent());
               bounds = component.getBounds();
               if (selectedEdge==1) {
                    component.setBounds((int)(dir2.getX()), (int)bounds.getY(), (int)(bounds.getWidth()-dir2.getX()+bounds.getX()), (int)bounds.getHeight());
               else
               if (selectedEdge==2) {
                    component.setBounds((int)bounds.getX(), (int)dir2.getY(), (int)bounds.getWidth(), (int)(bounds.getHeight()-dir2.getY()+1+bounds.getY()));
               else
               if (selectedEdge==3) {
                    component.setBounds((int)bounds.getX(), (int)bounds.getY(), (int)(dir.getX()+1), (int)bounds.getHeight());
               else
               if (selectedEdge==4) {
                    component.setBounds((int)bounds.getX(), (int)bounds.getY(), (int)bounds.getWidth(), (int)(dir.getY()+1));
          public void mouseExit(MouseEvent e) {
               component = null;
          public void mouseMoved(MouseEvent e) {
               getCursor(e.getPoint());
          public void mousePressed(MouseEvent e) {
               selectedEdge = getEdge(e.getPoint());
          public void mouseDragged(MouseEvent e) {
               if (selectedEdge == 0) {
                    return;
               moveTo(selectedEdge, e.getPoint());
          public void mouseReleased(MouseEvent e) {
               bounds = component.getBounds();
     public static final void setWindowsLF() {
          try {
               UIManager.setLookAndFeel(windowsUI);
          catch (Exception exc) {
               System.err.println("Error loading L&F: " + exc);
     public static void main(String[] args) {
          new MyFrame();
}Denis