Swing Hacks

Make Your Frame Dissolve #42

Chapter 6, Transparent and Animated Windows

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HACK

Create a Genie Effect

One of my favorite bits of eye candy from Mac OS X is the minimize dis-

solve. When you click on the minimize button in any application, the win-

dow will shrink and slide into the dock. This is called the genie effect, and it

not only looks cool, but it also gives you feedback about where a window

has gone. Example 6-3 is a subclass of

Dissolver that overrides the paint( )

method to create a spinning, shrinking window that somewhat mimics the

genie effect.

Example 6-2. A simple test class

public class DissolveHack {

public static void main(String[] args) {

final JFrame frame = new JFrame("Dissolve Hack");

JButton quit = new JButton("Quit");

quit.addActionListener(new ActionListener( ) {

public void actionPerformed(ActionEvent evt) {

new Dissolver( ).dissolveExit(frame);

}

});

frame.getContentPane( ).add(quit);

frame.pack( );

frame.setLocation(300,300);

frame.setSize(400,400);

frame.setVisible(true);

}

}

Example 6-3. Adding a genie effect to your toolbox

class SpinDissolver extends Dissolver {

public void paint(Graphics g) {

Graphics2D g2 = (Graphics2D)g;

// draw the screen, offset in case the window isn't at 0,0

g.drawImage(screen_buffer,-fullscreen.getX( ),

-fullscreen.getY( ),null);

// save the current transform

AffineTransform old_trans = g2.getTransform( );

// move to the upper-lefthand ...