Tu peus essayer ceci:
...
private ListSelectionListener rowListener;
private int keyPressed;
...
rowListener = new ListSelectionListener() {
private Rectangle rectToVisible;
public void valueChanged(final ListSelectionEvent e) {
if (e.getValueIsAdjusting()) {
return;
}
Rectangle visibleRect = table.getVisibleRect();
int visibleRows = visibleRect.height / table.getRowHeight();
int selectedRow = table.getSelectedRow();
rectToVisible = table.getCellRect(selectedRow, 0, true);
if(keyPressed == KeyEvent.VK_DOWN){
rectToVisible = table.getCellRect(selectedRow + visibleRows / 2, 0, true);
}else if(keyPressed == KeyEvent.VK_UP){
rectToVisible = table.getCellRect(selectedRow - visibleRows / 2, 0, true);
}
SwingUtilities.invokeLater(new Runnable() {
public void run() {
table.scrollRectToVisible(rectToVisible);
}
});
}
};
table.getSelectionModel().addListSelectionListener(rowListener);
table.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent evt) {
keyPressed = evt.getKeyCode();
}
public void keyReleased(KeyEvent evt) {
keyPressed = -1;
}
});
...
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