Swing/CalendarViewTable のバックアップ(No.4)

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• Swing/CalendarViewTable へ行く。
  • 1 (2018-01-29 (月) 15:00:50)
  • 2 (2018-01-29 (月) 16:16:31)
  • 3 (2018-01-30 (火) 13:10:45)
  • 4 (2018-02-01 (木) 20:21:48)
  • 5 (2018-02-02 (金) 17:40:26)
  • 6 (2018-02-02 (金) 20:11:40)
  • 7 (2018-02-05 (月) 16:07:58)
  • 8 (2018-02-15 (木) 14:23:42)
  • 9 (2018-03-02 (金) 17:44:10)
  • 10 (2018-03-13 (火) 16:29:32)
  • 11 (2020-03-17 (火) 18:32:28)
  • 12 (2021-09-24 (金) 14:51:03)
  • 13 (2024-03-01 (金) 19:11:43)
  • 14 (2024-09-05 (木) 20:43:02)

• category: swing folder: CalendarViewTable title: JTableにLocaleを考慮したLocalDateを適用してカレンダーを表示する tags: [JTable, LocalDate, Locale, Calendar] author: aterai pubdate: 2018-01-29T14:57:32+09:00 description: JTableに週の最初の曜日がLocaleに応じて変化するカレンダーを表示します。 image: https://drive.google.com/uc?export=view&id=1jXZtiYFaA5ABWsdaRBnPUKqS2_VBDkFqQA hreflang:

     href: https://java-swing-tips.blogspot.com/2018/01/apply-localdate-considering-locale-to.html
     lang: en

概要

JTableに週の最初の曜日がLocaleに応じて変化するカレンダーを表示します。

Screenshot

Download

• Runnable JAR example.jar
• Source code src.zip
• Repository GitHub

サンプルコード

class CalendarViewTableModel<T extends LocalDate> extends DefaultTableModel {
  private final LocalDate startDate;
  private final WeekFields weekFields = WeekFields.of(Locale.getDefault());
  public CalendarViewTableModel(T date) {
    super();
    LocalDate firstDayOfMonth = YearMonth.from(date).atDay(1);
    int dowv = firstDayOfMonth.get(weekFields.dayOfWeek()) - 1;
    startDate = firstDayOfMonth.minusDays(dowv);
  }
  @Override public Class<?> getColumnClass(int column) {
    return LocalDate.class;
  }
  @Override public String getColumnName(int column) {
    return weekFields.getFirstDayOfWeek().plus(column)
      .getDisplayName(TextStyle.SHORT_STANDALONE, Locale.getDefault());
  }
  @Override public int getRowCount() {
    return 6;
  }
  @Override public int getColumnCount() {
    return 7;
  }
  @Override public Object getValueAt(int row, int column) {
    return startDate.plusDays(row * getColumnCount() + column);
  }
  @Override public boolean isCellEditable(int row, int column) {
    return false;
  }
}

解説

上記のサンプルでは、Java 8からjava.timeパッケージに追加されたLocalDateをJTableのモデルとして使用し、月のカレンダーを表示しています。

• WeekFields#getFirstDayOfWeek()メソッドでLocaleに応じた週の最初の曜日を取得して、JTableの0列目を設定
  • 例: フランスとISO-8601標準では月曜日が週の最初の曜日になる
    • java -Duser.language=fr -jar example.jar

• 土曜と日曜の位置も6列目と0列目固定ではないので、以下のようにLocalDate.getDayOfWeek()メソッドで曜日を確認してその背景色を変更する必要がある

private class CalendarTableRenderer extends DefaultTableCellRenderer {
  @Override public Component getTableCellRendererComponent(
      JTable table, Object value, boolean selected, boolean focused,
      int row, int column) {
    super.getTableCellRendererComponent(table, value, selected, focused, row, column);
    setHorizontalAlignment(SwingConstants.CENTER);
    if (value instanceof LocalDate) {
      LocalDate d = (LocalDate) value;
      setText(String.valueOf(d.getDayOfMonth()));
      if (YearMonth.from(d).equals(YearMonth.from(currentLocalDate))) {
        setForeground(Color.BLACK);
      } else {
        setForeground(Color.GRAY);
      }
      DayOfWeek dow = d.getDayOfWeek();
      if (d.isEqual(realLocalDate)) {
        setBackground(new Color(220, 255, 220));
      } else if (dow == DayOfWeek.SUNDAY) {
        setBackground(new Color(255, 220, 220));
      } else if (dow == DayOfWeek.SATURDAY) {
        setBackground(new Color(220, 220, 255));
      } else {
        setBackground(Color.WHITE);
      }
    }
    return this;
  }
}

• JTableではなく、JListを使用すると週を跨いだ日付の範囲選択が可能

import java.awt.*;
import java.time.*;
import java.time.format.*;
import java.time.temporal.*;
import java.util.*;
import javax.swing.*;

public class CalendarViewListTest {
  private final JLabel monthLabel = new JLabel("", SwingConstants.CENTER);
  private final JList<LocalDate> monthList = new JList<>();
  private final LocalDate realLocalDate = LocalDate.now();
  private LocalDate currentLocalDate;

  public JComponent makeUI() {
    Dimension size = new Dimension(40, 20);

    monthList.setLayoutOrientation(JList.HORIZONTAL_WRAP);
    monthList.setVisibleRowCount(6);
    monthList.setFixedCellWidth(size.width);
    monthList.setFixedCellHeight(size.height);
    monthList.setCellRenderer(new CalendarTableRenderer<LocalDate>());
    monthList.getSelectionModel().setSelectionMode(
        ListSelectionModel.SINGLE_INTERVAL_SELECTION);

    Locale l = Locale.getDefault();
    DefaultListModel<DayOfWeek> weekModel = new DefaultListModel<>();
    DayOfWeek firstDayOfWeek = WeekFields.of(l).getFirstDayOfWeek();
    for (int i = 0; i < 7; i++) {
      weekModel.add(i, firstDayOfWeek.plus(i));
    }
    JList<DayOfWeek> header = new JList<>(weekModel);
    header.setLayoutOrientation(JList.HORIZONTAL_WRAP);
    header.setVisibleRowCount(0);
    header.setFixedCellWidth(size.width);
    header.setFixedCellHeight(size.height);
    header.setCellRenderer(new DefaultListCellRenderer() {
      @Override public Component getListCellRendererComponent(
          JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
        super.getListCellRendererComponent(list, value, index, false, false);
        setHorizontalAlignment(SwingConstants.CENTER);
        if (value instanceof DayOfWeek) {
          DayOfWeek dow = (DayOfWeek) value;
          String s = dow.getDisplayName(TextStyle.SHORT_STANDALONE, l);
          setText(s.substring(0, Math.min(2, s.length())));
          setBackground(new Color(220, 220, 220));
        }
        return this;
      }
    });
    updateMonthView(realLocalDate);

    JButton prev = new JButton("<");
    prev.addActionListener(e -> updateMonthView(currentLocalDate.minusMonths(1)));

    JButton next = new JButton(">");
    next.addActionListener(e -> updateMonthView(currentLocalDate.plusMonths(1)));

    JPanel monthPanel = new JPanel(new BorderLayout());
    monthPanel.add(monthLabel);
    monthPanel.add(prev, BorderLayout.WEST);
    monthPanel.add(next, BorderLayout.EAST);

    JScrollPane scroll = new JScrollPane(monthList);
    scroll.setColumnHeaderView(header);
    scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
    scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

    Box box = Box.createVerticalBox();
    box.add(monthPanel);
    box.add(Box.createVerticalStrut(2));
    box.add(scroll);

    JPanel p = new JPanel();
    p.add(box);
    return p;
  }
  private void updateMonthView(LocalDate localDate) {
    currentLocalDate = localDate;
    monthLabel.setText(localDate.format(DateTimeFormatter.ofPattern("yyyy / MM")
        .withLocale(Locale.getDefault())));
    WeekFields weekFields = WeekFields.of(Locale.getDefault());
    LocalDate firstDayOfMonth = localDate.with(TemporalAdjusters.firstDayOfMonth());
    int dowv = firstDayOfMonth.get(weekFields.dayOfWeek()) - 1;
    int vlen = 7 * 6;
    LocalDate date = firstDayOfMonth.minusDays(dowv);
    DefaultListModel<LocalDate> calendarModel = new DefaultListModel<>();
    for (int i = 0; i < vlen; i++) {
      calendarModel.add(i, date.plusDays(i));
    }
    monthList.setModel(calendarModel);
  }
  class CalendarTableRenderer<E extends LocalDate> implements ListCellRenderer<E> {
    private final JLabel renderer = new JLabel("", SwingConstants.CENTER);
    @Override public Component getListCellRendererComponent(
        JList<? extends E> list, E value, int index,
        boolean isSelected, boolean cellHasFocus) {
      renderer.setOpaque(true);
      if (value instanceof LocalDate) {
        LocalDate d = (LocalDate) value;
        renderer.setText(String.valueOf(d.getDayOfMonth()));
        if (YearMonth.from(d).equals(YearMonth.from(currentLocalDate))) {
          renderer.setForeground(Color.BLACK);
        } else {
          renderer.setForeground(Color.GRAY);
        }
        DayOfWeek dow = d.getDayOfWeek();
        if (d.isEqual(realLocalDate)) {
          renderer.setBackground(new Color(220, 255, 220));
        } else if (dow == DayOfWeek.SUNDAY) {
          renderer.setBackground(new Color(255, 220, 220));
        } else if (dow == DayOfWeek.SATURDAY) {
          renderer.setBackground(new Color(220, 220, 255));
        } else {
          renderer.setBackground(Color.WHITE);
        }
        if (isSelected) {
          renderer.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.GRAY));
        } else {
          renderer.setBorder(BorderFactory.createEmptyBorder(0, 0, 1, 0));
        }
      }
      return renderer;
    }
  }
  public static void main(String[] args) {
    EventQueue.invokeLater(() -> {
      JFrame f = new JFrame();
      f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      f.getContentPane().add(new CalendarViewListTest().makeUI());
      f.setSize(320, 240);
      f.setLocationRelativeTo(null);
      f.setVisible(true);
    });
  }
}

参考リンク

• WeekFields#getFirstDayOfWeek() (Java Platform SE 8)
• Local Date Combo « Java Tips Weblog

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