Swing Hacks

Slide Notes Out from the Taskbar #46

Chapter 6, Transparent and Animated Windows

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HACK

Running the Hack

The SlideInNotification will take any JComponent as its contents. To make

things a little interesting, the

TestSlideInNotification class, shown in

Example 6-13, grabs an icon from the

JOptionPane class and makes a JLabel

of that and a little nonsense text.

public void setAnimatingHeight (int height) {

animatingSize.height = height;

setSize (animatingSize);

}

private void makeOffscreenImage(JComponent source) {

GraphicsEnvironment ge =

GraphicsEnvironment.getLocalGraphicsEnvironment( );

GraphicsConfiguration gfxConfig =

ge.getDefaultScreenDevice().getDefaultConfiguration( );

offscreenImage =

gfxConfig.createCompatibleImage(source.getWidth( ),

source.getHeight( ));

Graphics2D offscreenGraphics =

(Graphics2D) offscreenImage.getGraphics( );

// windows workaround

offscreenGraphics.setColor (source.getBackground( ));

offscreenGraphics.fillRect (0, 0,

source.getWidth(), source.getHeight( ));

// paint from source to offscreen buffer

source.paint (offscreenGraphics);

}

public Dimension getPreferredSize( ) { return animatingSize; }

public Dimension getMinimumSize( ) { return animatingSize; }

public Dimension getMaximumSize( ) { return animatingSize; }

public void update (Graphics g) {

// override to eliminate flicker from

// unnecessary clear

paint (g);

}

public void paint (Graphics g) {

// ...