Swrollpane / viewport component showing overview

Question

Swrollpane / viewport component showing overview

I am looking for the Swing component, which is a scrollpane / viewport extension that allows you to open and navigate to the overview of the content currently being displayed. I am sure that I saw several blog posts in the past months (years?) Showing such a component, but I can no longer find the component.

Here is an image of what I'm looking for:

scrollpane with overview

If you remember such a post or you have links in your posts, I would thank you for the transfer of information.

Thank you for your help.

+3

java swing custom-component

Matthieu BROUILLARD Apr 11 '12 at 9:07

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3 answers

, java-image-scaling ( LGPL) - , :

public static void main ( String[] args )
{
    final JFrame mainFrame = new JFrame ();

    JPanel content = new JPanel ( new GridLayout ( 20, 20 ) );
    for ( int i = 0; i < 20; i++ )
    {
        for ( int j = 0; j < 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 );
}