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    <p>Here is a working example, but you will need <a href="http://code.google.com/p/java-image-scaling/" rel="nofollow">java-image-scaling</a> library (its LGPL) - it is used for smooth scaling of preview image, otherwise you get totally ruined image:</p> <pre><code>public static void main ( String[] args ) { final JFrame mainFrame = new JFrame (); JPanel content = new JPanel ( new GridLayout ( 20, 20 ) ); for ( int i = 0; i &lt; 20; i++ ) { for ( int j = 0; j &lt; 20; j++ ) { content.add ( new JLabel ( "Test " + i + ":" + j ) { { setBorder ( BorderFactory.createEmptyBorder ( 20, 20, 20, 20 ) ); } } ); } } final JScrollPane pane = new JScrollPane ( content ); pane.setCorner ( JScrollPane.LOWER_TRAILING_CORNER, new JButton () { { final JButton button = this; addActionListener ( new ActionListener () { public void actionPerformed ( ActionEvent e ) { JComponent comp = ( JComponent ) pane.getViewport ().getView (); Dimension size = comp.getSize (); Rectangle viewRect = comp.getVisibleRect (); // Drawing preview BufferedImage image = new BufferedImage ( size.width, size.height, BufferedImage.TYPE_INT_RGB ); Graphics2D g2d = image.createGraphics (); comp.print ( g2d ); g2d.dispose (); // Rescaling preview int width = 200; int height = comp.getHeight () * width / comp.getHeight (); BufferedImage rescaled = new ResampleOp ( width, height ).filter ( image, null ); // Drawing view rect float diff = (float)width / size.width; g2d = rescaled.createGraphics (); g2d.setPaint ( Color.RED ); g2d.drawRect ( Math.round ( viewRect.x * diff ), Math.round ( viewRect.y * diff ), Math.round ( viewRect.width * diff ), Math.round ( viewRect.height * diff ) ); g2d.dispose (); // Displaying preview final JDialog preview = new JDialog ( mainFrame ); preview.setUndecorated ( true ); preview.add ( new JLabel ( new ImageIcon ( rescaled ) ) { { setBorder ( BorderFactory.createLineBorder ( Color.BLACK ) ); setFocusable ( true ); } } ); Point los = button.getLocationOnScreen (); preview.setSize ( width + 2, height + 2 ); preview.setLocation ( los.x - width - 2, los.y - height - 2 ); preview.setVisible ( true ); preview.requestFocus (); preview.addFocusListener ( new FocusAdapter () { public void focusLost ( FocusEvent e ) { preview.dispose (); } } ); } } ); } } ); mainFrame.add ( pane ); mainFrame.setSize ( 600, 600 ); mainFrame.setLocationRelativeTo ( null ); mainFrame.setDefaultCloseOperation ( JFrame.EXIT_ON_CLOSE ); mainFrame.setVisible ( true ); } </code></pre> <p>So basically i create a snapshot of the panel, rescale it and place into the small dialog that opens near the button and closes on focus loss. Snapshot creation might be time-wasting though, but i don't know any better way to create a rendered preview of the whole scrollpane container - you have to paint it onto something to display preview anyway and that means it will spend the same time.</p> <p>Also you can easily modify the preview component so you can move the visible rect by dragging the RED rect on the preview dialog :)</p>
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    1. POScrollpane/Viewport swing component showing an overview
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    1. USMikle Garin
    1. USMikle Garin
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    1. COHi, that's a good starting point but I'll still try to find the component I am thinking about.
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      1. USMatthieu BROUILLARD
    2. COAs i remember i saw something like that in SwingX examplers - you might check it there. Not sure about that though...
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      1. USMikle Garin
 

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