Sunday, March 25, 2007

Transparent Window Looking Better

Thanks to Eric Bruke's blog entry i got to know the problems in the problem with the Transparent window so here are the tweaks remove the threading part from the program but that might affect the speed of processing of your computer so copy and use the following alternative code thraeding still involved but a few minor changes like i changed the refresh period and the quickRrefresh() that was put there as a comment, i removed the coments.The new improved code and replaces refresh() in "public void run()" with quickRefresh()
here is the improved code:

import java.awt.*;
import java.util.Date;
import javax.swing.*;
import java.awt.event.*;
public class BGTest1 {

public static void main(String[] args) {
JFrame frame = new JFrame("Transparent Window");
TransparentBackground bg = new TransparentBackground(frame);
bg.setLayout(new BorderLayout());

JButton button = new JButton("This is a button");
JLabel label = new JLabel("This is a label");

class TransparentBackground extends JComponent
implements ComponentListener, WindowFocusListener,
Runnable {
private JFrame frame;
protected Image background;
private long lastupdate = 0;
public boolean refreshRequested = true;

public TransparentBackground(JFrame frame) {
this.frame = frame;

new Thread(this).start();

public void updateBackground() {
try {
Robot rbt = new Robot();
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension dim = tk.getScreenSize();
background = rbt.createScreenCapture(
new Rectangle(0,0,(int)dim.getWidth(),(int)dim.getHeight()));
} catch (Exception ex) {

public void paintComponent(Graphics g) {
Point pos = this.getLocationOnScreen();
Point offset = new Point(-pos.x,-pos.y);

public void componentShown(ComponentEvent evt) { repaint(); }
public void componentResized(ComponentEvent evt) { repaint(); }
public void componentMoved(ComponentEvent evt) { repaint(); }
public void componentHidden(ComponentEvent evt) { }

public void windowGainedFocus(WindowEvent evt) { refresh(); }
public void windowLostFocus(WindowEvent evt) { refresh(); }

public void refresh() {
if(this.isVisible() && frame.isVisible()) {
refreshRequested = true;
lastupdate = new Date().getTime();

private boolean recurse = false;
public void quickRefresh() {
p("quick refresh");
long now = new Date().getTime();
if(recurse ||
((now - lastupdate) < recurse =" true;" location =" frame.getLocation();" recurse =" false;" lastupdate =" now;" now =" new"> 5)) {
if(frame.isVisible()) {
Point location = frame.getLocation();
lastupdate = now;
refreshRequested = false;
} catch (Exception ex) {

public static void p(String str) {



Anonymous said...

Dude. The code is garbled in quickRefresh().

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