transparent jframe

[rude04]

how do you make a jframe transparent?...i need to add a png or gif image in the frame..so when i run the program it will only show the image..and the image would float in the desktop..

i also need to add a few components like JButton.. i want the frame to be invisible so the button would also be floating...

i tried setOpaque(false); but in only shows an error..

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

public class emptyframe extends JFrame{

		private JLabel BG = new JLabel (new ImageIcon("Earth-06-june.gif"));


    public emptyframe()
    {
     	watever();

     BG.setBounds(50,50,100,100);
     add(BG);


    }


    	private void watever()
    	{
		  setPreferredSize (new Dimension (300, 300));
		  setLayout (null);
		  setVisible(true);
		  pack();
		  setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
		  setLocation(400,250);
		  setBackground(Color.black);

		}

    public static void main (String[] args) {

        new emptyframe().setVisible(true);


    }
}

[puneetkay]

Hello,

I dont think it possible to make Transparent JFrame (according to my knowledge). You can use java.awt.Window class instead of JFrame.

Or you can use this trick to make it work like transparent.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
 
 
 
public class TransparentBackground extends JComponent
		implements ComponentListener, WindowFocusListener, Runnable {
 
	// constants ---------------------------------------------------------------
	// instance ----------------------------------------------------------------
	private JFrame _frame;
	private BufferedImage _background;
	private long _lastUpdate = 0;
	private boolean _refreshRequested = true;
	private Robot _robot;
	private Rectangle _screenRect;
	private ConvolveOp _blurOp;
 
	// constructor -------------------------------------------------------------
 
	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 ---------------------------------------------------------------
 
	protected void updateBackground() {
		_background = _robot.createScreenCapture(_screenRect);
	}
 
 
 
	protected void refresh() {
		if (_frame.isVisible() && this.isVisible()) {
			repaint();
			_refreshRequested = true;
			_lastUpdate = System.currentTimeMillis();
		}
	}
 
 
	// JComponent --------------------------------------------------------------
 
	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());
	}
 
	// ComponentListener -------------------------------------------------------
	public void componentHidden(ComponentEvent e) {
	}
 
	public void componentMoved(ComponentEvent e) {
		repaint();
	}
 
	public void componentResized(ComponentEvent e) {
		repaint();
 
	}
 
	public void componentShown(ComponentEvent e) {
		repaint();
	}
 
	// WindowFocusListener -----------------------------------------------------
	public void windowGainedFocus(WindowEvent e) {
		refresh();
	}
 
	public void windowLostFocus(WindowEvent e) {
		refresh();
	}
 
	// Runnable ----------------------------------------------------------------
	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);
	}
}

Regards,

[rude04]

,.,thanks for the reply, the code was good but it only makes it translucent..can i add components like jbutton and jlabel in window?
can you give me a sample code uses "java.awt.Window" that is simple like the code i posted...THANKS again!!:)

[puneetkay]

This article is for you
http://java.sun.com/developer/technicalArticles/GUI/translucent_shaped_windows/

best of luck!

[rude04]

ill check it out..thanks for the link:)