Code
Set disableIndexSet = new HashSet<>();
JList list = new JList<>(model);
list.setCellRenderer(new DefaultListCellRenderer() {
@Override public Component getListCellRendererComponent(
JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus) {
Component c;
if (disableIndexSet.contains(index)) {
c = super.getListCellRendererComponent(
list, value, index, false, false);
c.setEnabled(false);
} else {
c = super.getListCellRendererComponent(
list, value, index, isSelected, cellHasFocus);
}
return c;
}
});
initDisableIndex(disableIndexSet);
ActionMap am = list.getActionMap();
am.put("selectNextRow", new AbstractAction() {
@Override public void actionPerformed(ActionEvent e) {
int index = list.getSelectedIndex();
for (int i = index + 1; i < list.getModel().getSize(); i++) {
if (!disableIndexSet.contains(i)) {
list.setSelectedIndex(i);
break;
}
}
}
});
am.put("selectPreviousRow", new AbstractAction() {
@Override public void actionPerformed(ActionEvent e) {
int index = list.getSelectedIndex();
for (int i = index - 1; i >= 0; i--) {
if (!disableIndexSet.contains(i)) {
list.setSelectedIndex(i);
break;
}
}
}
});
//...
protected final void initDisableIndex(Set set) {
set.clear();
try {
set.addAll(Arrays.stream(field.getText().split(","))
.map(String::trim).filter(s -> !s.isEmpty())
.map(Integer::valueOf).collect(Collectors.toSet()));
} catch (NumberFormatException ex) {
Toolkit.getDefaultToolkit().beep();
JOptionPane.showMessageDialog(
field, "invalid value.\n" + ex.getMessage(),
"Error", JOptionPane.ERROR_MESSAGE);
}
}
References
