Move large numbers of items to another JList as fast as possible

• download example.jar
• download src.zip
• repository

Code

private static <E> void move1(JList<E> from, JList<E> to) {
  ListSelectionModel sm = from.getSelectionModel();
  int[] selectedIndices = from.getSelectedIndices();

  DefaultListModel<E> fromModel = (DefaultListModel<E>) from.getModel();
  DefaultListModel<E> toModel = (DefaultListModel<E>) to.getModel();
  List<E> unselectedValues = new ArrayList<>();
  for (int i = 0; i < fromModel.getSize(); i++) {
    if (!sm.isSelectedIndex(i)) {
      unselectedValues.add(fromModel.getElementAt(i));
    }
  }
  if (selectedIndices.length > 0) {
    for (int i: selectedIndices) {
      toModel.addElement(fromModel.get(i));
    }
    fromModel.clear();
    // unselectedValues.forEach(fromModel::addElement);
    DefaultListModel<E> model = new DefaultListModel<>();
    unselectedValues.forEach(model::addElement);
    from.setModel(model);
  }
}

References

• Move large numbers of items to another JList as fast as possible(Japanese)

Create Week Calendar in JList and display contribution activity heatmap

• download example.jar
• download src.zip
• repository

Code

JList<Contribution> weekList = new JList<Contribution>() {
  @Override public void updateUI() {
    setCellRenderer(null);
    super.updateUI();
    setLayoutOrientation(JList.VERTICAL_WRAP);
    setVisibleRowCount(DayOfWeek.values().length); // ensure 7 rows in the list
    setFixedCellWidth(size.width);
    setFixedCellHeight(size.height);
    setCellRenderer(new ContributionListRenderer());
    getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
    setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
  }
};
// ...
private class ContributionListRenderer implements ListCellRenderer<Contribution> {
  private final Icon emptyIcon = new ColorIcon(Color.WHITE);
  private final ListCellRenderer<? super Contribution> renderer
    = new DefaultListCellRenderer();
  @Override public Component getListCellRendererComponent(
      JList<? extends Contribution> list, Contribution value, int index,
      boolean isSelected, boolean cellHasFocus) {
    JLabel l = (JLabel) renderer.getListCellRendererComponent(
        list, null, index, isSelected, cellHasFocus);
    if (value.date.isAfter(currentLocalDate)) {
      l.setIcon(emptyIcon);
      l.setToolTipText(null);
    } else {
      l.setIcon(activityIcons.get(value.activity));
      String actTxt = value.activity == 0 ? "No" : Objects.toString(value.activity);
      l.setToolTipText(actTxt + " contribution on " + value.date.toString());
    }
    return l;
  }
}

References

• Create Week Calendar in JList and display contribution activity heatmap(Japanese)

Create a range selectable calendar with JList

• download example.jar
• download src.zip
• repository

Code

public final LocalDate realLocalDate = LocalDate.now();
public LocalDate currentLocalDate;
public final Dimension size = new Dimension(40, 26);

// ...
JLabel yearMonthLabel = new JLabel("", SwingConstants.CENTER);
JList<LocalDate> monthList = new JList<LocalDate>(new CalendarViewListModel(realLocalDate)) {
  @Override public void updateUI() {
    setCellRenderer(null);
    super.updateUI();
    setLayoutOrientation(JList.HORIZONTAL_WRAP);
    setVisibleRowCount(CalendarViewListModel.ROW_COUNT); // ensure 6 rows in the list
    setFixedCellWidth(size.width);
    setFixedCellHeight(size.height);
    setCellRenderer(new CalendarListRenderer<>());
    getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
  }
};

// ...
class CalendarViewListModel extends AbstractListModel<LocalDate> {
  public static final int ROW_COUNT = 6;
  private final LocalDate startDate;
  private final WeekFields weekFields = WeekFields.of(Locale.getDefault());
  protected CalendarViewListModel(LocalDate date) {
    super();
    LocalDate firstDayOfMonth = YearMonth.from(date).atDay(1);
    int dowv = firstDayOfMonth.get(weekFields.dayOfWeek()) - 1;
    startDate = firstDayOfMonth.minusDays(dowv);
  }

  @Override public int getSize() {
    return DayOfWeek.values().length * ROW_COUNT;
  }

  @Override public LocalDate getElementAt(int index) {
    return startDate.plusDays(index);
  }
}

References

• Create a range selectable calendar with JList(Japanese)
• Java Swing Tips: Apply LocalDate considering Locale to JTable and display calendar