Java Utililty Methods JList

List of utility methods to do JList

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Description

The list of methods to do JList are organized into topic(s).

Method

booleanisIndexFullyVisible(JList list, int index)
is Index Fully Visible 
int first = list.getFirstVisibleIndex();
int last = list.getLastVisibleIndex();
if (index < 0 || first < 0 || last < 0 || index < first || index > last) {
    return false;
if (index > first && index < last) {
    return true;
return list.getVisibleRect().contains(list.getCellBounds(index, index));
voidJListClearData(javax.swing.JList list)
J List Clear Data 
list.setListData(new Object[0]);
intloc2IndexFileList(JList list, Point point)
loc Index File List 
int index = list.locationToIndex(point);
if (index != -1) {
    Object bySize = list.getClientProperty("List.isFileList");
    if (bySize instanceof Boolean && ((Boolean) bySize).booleanValue()
            && !pointIsInActualBounds(list, index, point)) {
        index = -1;
return index;
voidnavigateThroughList(javax.swing.JList list, int keyCode)
navigate Through List 
if (KeyEvent.VK_LEFT == keyCode || KeyEvent.VK_RIGHT == keyCode) {
    return;
int selectedRow = list.getSelectedIndex();
ListModel lm = list.getModel();
if (-1 == selectedRow) {
    selectedRow = 0;
switch (keyCode) {
case KeyEvent.VK_HOME:
    selectedRow = 0;
    break;
case KeyEvent.VK_END:
    selectedRow = lm.getSize() - 1;
    break;
case KeyEvent.VK_DOWN:
    if (lm.getSize() > (selectedRow + 1)) {
        selectedRow++;
    break;
case KeyEvent.VK_UP:
    if (selectedRow > 0) {
        selectedRow--;
    break;
list.setSelectedIndex(selectedRow);
list.ensureIndexIsVisible(selectedRow);
voidpickFirstIfNone(JList list)
pick First If None 
if (list.isSelectionEmpty()) {
    list.setSelectedIndex(0);
} else {
booleanpointIsInActualBounds(JList list, int index, Point point)
Returns true if the given point is within the actual bounds of the JList item at index (not just inside the cell). 
ListCellRenderer renderer = list.getCellRenderer();
ListModel dataModel = list.getModel();
Object value = dataModel.getElementAt(index);
Component item = renderer.getListCellRendererComponent(list, value, index, false, false);
Dimension itemSize = item.getPreferredSize();
Rectangle cellBounds = list.getCellBounds(index, index);
if (!item.getComponentOrientation().isLeftToRight()) {
    cellBounds.x += (cellBounds.width - itemSize.width);
...
booleanpointIsInActualBounds(JList list, int index, Point point)
point Is In Actual Bounds 
ListCellRenderer renderer = list.getCellRenderer();
ListModel dataModel = list.getModel();
Object value = dataModel.getElementAt(index);
Component item = renderer.getListCellRendererComponent(list, value, index, false, false);
Dimension itemSize = item.getPreferredSize();
Rectangle cellBounds = list.getCellBounds(index, index);
if (!item.getComponentOrientation().isLeftToRight()) {
    cellBounds.x += (cellBounds.width - itemSize.width);
...
voidsetErrorBackground(JList comp)
set Error Background 
comp.setBackground(ERROR_BACKGROUND);
voidupdatebandList(final JList bandList, final Map paramMap, final String paramName)
updateband List 
updateParamList(bandList, paramMap, paramName);
voidupdateList(JList list, LinkedHashMap map)
update List 
DefaultListModel listValue = new DefaultListModel();
list.removeAll();
Iterator<Map.Entry<K, V>> iter = map.entrySet().iterator();
while (iter.hasNext()) {
    Map.Entry entry = iter.next();
    listValue.addElement(entry.getKey().toString());
list.setModel(listValue);
...