Here is another version of code for Transparent Window in Java seems to be better than any of the previous version and has a blur effect to emulate the Vista look.Here is the code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class TransparentBackground extends JComponent
implements ComponentListener, WindowFocusListener, Runnable {
private JFrame _frame;
private BufferedImage _background;
private long _lastUpdate = 0;
private boolean _refreshRequested = true;
private Robot _robot;
private Rectangle _screenRect;
private ConvolveOp _blurOp;
public TransparentBackground(JFrame frame) {
_frame = frame;
try {
_robot = new Robot();
} catch (AWTException e) {
e.printStackTrace();
return;
}
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
_screenRect = new Rectangle(dim.width, dim.height);
float[] my_kernel = {
0.10f, 0.10f, 0.10f,
0.10f, 0.20f, 0.10f,
0.10f, 0.10f, 0.10f};
_blurOp = new ConvolveOp(new Kernel(3, 3, my_kernel));
updateBackground();
_frame.addComponentListener(this);
_frame.addWindowFocusListener(this);
new Thread(this).start();
}
protected void updateBackground() {
_background = _robot.createScreenCapture(_screenRect);
}
protected void refresh() {
if (_frame.isVisible() && this.isVisible()) {
repaint();
_refreshRequested = true;
_lastUpdate = System.currentTimeMillis();
}
}
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Point pos = this.getLocationOnScreen();
BufferedImage buf = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
buf.getGraphics().drawImage(_background, -pos.x, -pos.y, null);
Image img = _blurOp.filter(buf, null);
g2.drawImage(img, 0, 0, null);
g2.setColor(new Color(255, 255, 255, 192));
g2.fillRect(0, 0, getWidth(), getHeight());
}
public void componentHidden(ComponentEvent e) {
refresh();
}
public void componentMoved(ComponentEvent e) {
repaint();
}
public void componentResized(ComponentEvent e) {
repaint();
}
public void componentShown(ComponentEvent e) {
repaint();
}
public void windowGainedFocus(WindowEvent e) {
refresh();
}
public void windowLostFocus(WindowEvent e) {
refresh();
}
public void run() {
try {
while (true) {
Thread.sleep(100);
long now = System.currentTimeMillis();
if (_refreshRequested && ((now - _lastUpdate) > 1000)) {
if (_frame.isVisible()) {
Point location = _frame.getLocation();
_frame.setLocation(-_frame.getWidth(), -_frame.getHeight());
updateBackground();
_frame.setLocation(location);
refresh();
}
_lastUpdate = now;
_refreshRequested = false;
}
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Transparent Window");
TransparentBackground bg = new TransparentBackground(frame);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(bg);
frame.pack();
frame.setSize(200, 200);
frame.setLocation(500, 500);
frame.setVisible(true);
}
}
For Mac Users you need to simply write the following
import java.swing.*;
.......
public class TransparentBackground{
.......//code here
.......//code here
.......//code here
.......//code here
frame.setBackground(new Color(0, 0, 0, 0));
}
