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copied!<p>Out of pure interest (and a little boredom) I created a working example:</p> <pre><code>/** * Scrolls exactly one Item a time. Works for JTable and JList. * * @author Lukas Knuth * @version 1.0 */ public class Main { private JTable table; private JList list; private JFrame frame; private final String[] data; /** * This is where the magic with the "just one item per scroll" happens! */ private final AdjustmentListener singleItemScroll = new AdjustmentListener() { @Override public void adjustmentValueChanged(AdjustmentEvent e) { // The user scrolled the List (using the bar, mouse wheel or something else): if (e.getAdjustmentType() == AdjustmentEvent.TRACK){ // Jump to the next "block" (which is a row". e.getAdjustable().setBlockIncrement(1); } } }; public Main(){ // Place some random data: Random rnd = new Random(); data = new String[120]; for (int i = 0; i < data.length; i++) data[i] = "Set "+i+" for: "+rnd.nextInt(); for (int i = 0; i < data.length; i+=10) data[i] = "<html>"+data[i]+"<br>Spacer!</html>"; // Create the GUI: setupGui(); // Show: frame.pack(); frame.setVisible(true); } private void setupGui(){ frame = new JFrame("Single Scroll in Swing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JSplitPane split = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT); frame.add(split); // Add Data to the table: table = new JTable(new AbstractTableModel() { @Override public int getRowCount() { return data.length; } @Override public int getColumnCount() { return 1; } @Override public Object getValueAt(int rowIndex, int columnIndex) { return data[rowIndex]; } }); for (int i = 0; i < data.length; i+=10) table.setRowHeight(i, 30); JScrollPane scroll = new JScrollPane(table); // Add out custom AdjustmentListener to jump only one row per scroll: scroll.getVerticalScrollBar().addAdjustmentListener(singleItemScroll); split.add(scroll); list = new JList<String>(data); scroll = new JScrollPane(list); // Add out custom AdjustmentListener to jump only one row per scroll: scroll.getVerticalScrollBar().addAdjustmentListener(singleItemScroll); split.add(scroll); } public static void main(String[] agrs){ new Main(); } } </code></pre> <p>The real magic is done in the custom <a href="http://docs.oracle.com/javase/6/docs/api/java/awt/event/AdjustmentListener.html" rel="nofollow"><code>AdjustmentListener</code></a>, where we go and increase the current "scroll-position" by one single block per time. This works up and down and with different row-sizes, as shown in the example.</p> <hr> <p>As <strong>@kleopatra</strong> mentioned in the comments, you can also use a <a href="http://docs.oracle.com/javase/6/docs/api/java/awt/event/MouseWheelListener.html" rel="nofollow"><code>MouseWheelListener</code></a> to only redefine the behavior of the mouse-wheel.</p> <p>See the official tutorial <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/mousewheellistener.html" rel="nofollow">here</a>.</p>

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