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/*
* SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package net.java.sip.communicator.impl.gui.customcontrols;
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import net.java.sip.communicator.impl.gui.utils.*;
import net.java.sip.communicator.swing.*;
/**
* The <tt>TransparentBackground</tt> is a <tt>JComponent</tt>, which is
* added to a <tt>Window</tt> in order to make it transparent.
* <p>
* <b>How to use the <tt>TransparentBackground</tt>?</b>
* The <tt>TransparentBackground</tt> is created and added to the content pane
* of the <tt>Window</tt> that should be made transparent. All other components
* then are added to the <tt>TransparentBackground</tt> component and not
* directly to the window content pane.
* <p>
* <b>How it works?</b>
* The <tt>TransparentBackground</tt> is a <tt>JComponent</tt> which is not
* really transparent, but only looks like. It overrides the
* <code>paintComponent</code> method of <tt>JComponent</tt> to paint its
* own background image, which is an exact image of the screen at the position
* where the window will apear and with the same size. The
* <tt>java.awt.Robot</tt> class is used to make the screen capture.
* <p>
* Note that the effect of transparence is gone when behind there is an
* application which shows dynamic images or something the moves, like
* a movie for example.
*
* @author Yana Stamcheva
*/
public class TransparentBackground extends JComponent {
private BufferedImage background;
private Robot robot;
private final Window window;
/**
* Creates an instance of <tt>TransparentBackground</tt> by specifying
* the parent <tt>Window</tt> - this is the window that should be made
* transparent.
*
* @param window The parent <tt>Window</tt>
*/
public TransparentBackground(Window window) {
this.window = window;
try {
robot = new Robot();
} catch (AWTException e) {
e.printStackTrace();
return;
}
}
/**
* Updates the background. Makes a new screen capture at the given
* coordiantes.
*
* @param x The x coordinate.
* @param y The y coordinate.
*/
public void updateBackground(int x, int y) {
this.background = robot.createScreenCapture(new Rectangle(x, y, x
+ this.window.getWidth(), y + this.window.getHeight()));
}
/**
* Overrides the <code>paintComponent</code> method in <tt>JComponent</tt>
* to paint the screen capture image as a background of this component.
*/
protected void paintComponent(Graphics g)
{
g = g.create();
try
{
AntialiasingManager.activateAntialiasing(g);
Graphics2D g2 = (Graphics2D) g;
int width = getWidth();
int height = getHeight();
g2.drawImage(this.background, 0, 0, null);
g2.setColor(new Color(255, 255, 255, 180));
g2.fillRoundRect(0, 0, width, height, 10, 10);
g2.setColor(Constants.BORDER_COLOR);
g2.drawRoundRect(0, 0, width - 1, height - 1, 10, 10);
}
finally
{
g.dispose();
}
}
}
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