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2018/02/26

aterai

Create a range selectable calendar with JList

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);
  }
};

monthList.getActionMap().put("selectNextIndex", new AbstractAction() {
  @Override public void actionPerformed(ActionEvent e) {
    int index = monthList.getLeadSelectionIndex();
    if (index < monthList.getModel().getSize() - 1) {
      monthList.setSelectedIndex(index + 1);
    } else {
      LocalDate d = monthList.getModel()
        .getElementAt(monthList.getModel().getSize() - 1)
        .plusDays(1);
      updateMonthView(currentLocalDate.plusMonths(1));
      monthList.setSelectedValue(d, false);
    }
  }
});
//...
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

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