private void init() {
listMultipleSelection = getMultipleSelection();
listModel = new DefaultListModel();
// create GUI
if (listMultipleSelection.getPossibleValues().isEmpty()) {
panel = null;
itemsContainerList = null;
return;
}
final Border padding = BorderFactory.createEmptyBorder(5, 10, 5, 10);
panel = new JPanel();
BorderLayout layout = new BorderLayout();
panel.setLayout(layout);
final JTextArea jta = new JTextArea(getDescription());
jta.setPreferredSize(new Dimension(200, 50));
jta.setLineWrap(true);
jta.setWrapStyleWord(true);
jta.setBorder(padding);
panel.add(jta, BorderLayout.PAGE_START);
jta.setBackground(null);
jta.setEditable(false);
// put the items in a list
itemsContainerList =
new JList(listModel); // new JList(listMultipleSelection.getPossibleValues().toArray());
for (T value : getMultipleSelection().getPossibleValues()) listModel.addElement(value);
itemsContainerList.setFont(new Font("sansserif", Font.PLAIN, 11));
itemsContainerList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
itemsContainerList.addListSelectionListener(this);
// selected items
final List<T> selectedVals = listMultipleSelection.getSelectedValues();
final List<T> allValues = listMultipleSelection.getPossibleValues();
final int[] selectedIdx = new int[selectedVals.size()];
int index = 0;
for (T selected : selectedVals) {
for (int i = 0; i < allValues.size(); i++) {
if (itemsContainerList.getModel().getElementAt(i).equals(selected)) {
selectedIdx[index] = i;
index++;
}
}
}
itemsContainerList.setSelectedIndices(selectedIdx);
// use a JscrollPane to visualize the items
final JScrollPane scrollpane = new JScrollPane(itemsContainerList);
scrollpane.setAutoscrolls(true);
scrollpane.setOpaque(false);
scrollpane.setBorder(padding);
panel.add(scrollpane, BorderLayout.CENTER);
}
@Override
public void update() {
boolean reloadSelection = false;
listMultipleSelection = getMultipleSelection();
// If the list of elements has changed, remove old elements and add new ones
if (!Arrays.equals(listModel.toArray(), listMultipleSelection.getPossibleValues().toArray())) {
listModel.removeAllElements();
reloadSelection = true;
for (T value : listMultipleSelection.getPossibleValues()) listModel.addElement(value);
} else {
// if the list is the same but the selection has changed, remove all selections and select new
// ones
if (!Arrays.equals(
itemsContainerList.getSelectedValues(),
listMultipleSelection.getSelectedValues().toArray())) reloadSelection = true;
}
if (reloadSelection) {
// selected items
final List<T> selectedVals = listMultipleSelection.getSelectedValues();
final List<T> allValues = listMultipleSelection.getPossibleValues();
final int[] selectedIdx = new int[selectedVals.size()];
int index = 0;
for (T selected : selectedVals) {
for (int i = 0; i < allValues.size(); i++) {
if (itemsContainerList.getModel().getElementAt(i).equals(selected)) {
selectedIdx[index] = i;
index++;
}
}
}
itemsContainerList.removeSelectionInterval(0, allValues.size() - 1);
itemsContainerList.setSelectedIndices(selectedIdx);
}
}