JTabbedPaneで週間予定カレンダーを作成する

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Summary

JTabbedPaneのタブで一週間分の日付と曜日を表示し、それを選択可能な週間予定カレンダーを作成します。

Screenshot

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Source Code Examples

JTabbedPane tabs = new ClippedTitleTabbedPane();
Locale locale = Locale.getDefault();
LocalDate today = LocalDate.now(ZoneId.systemDefault());
DayOfWeek firstDay = WeekFields.of(locale).getFirstDayOfWeek();
LocalDate startOfWeek = today.with(TemporalAdjusters.previousOrSame(firstDay));
for (int i = 0; i < DayOfWeek.values().length; i++) {
  LocalDate date = startOfWeek.plusDays(i);
  tabs.addTab("", makeTabContent(date));
  tabs.setTabComponentAt(i, makeDayTab(date, today, locale));
}
// ...
private static JPanel makeDayTab(LocalDate date, LocalDate today, Locale locale) {
  String dayName = date.getDayOfWeek().getDisplayName(TextStyle.SHORT, locale);
  JLabel lblDay = new JLabel(dayName, SwingConstants.CENTER);
  lblDay.setFont(lblDay.getFont().deriveFont(11f));
  lblDay.setForeground(ModernTabbedPaneUI.TEXT_PRIMARY);

  String dayOfMonth = String.valueOf(date.getDayOfMonth());
  JLabel lblDate = new JLabel(dayOfMonth, SwingConstants.CENTER);
  lblDate.setFont(lblDate.getFont().deriveFont(Font.BOLD, 18f));
  lblDate.setForeground(ModernTabbedPaneUI.TEXT_PRIMARY);

  JPanel panel = new JPanel(new BorderLayout(0, 2));
  panel.setOpaque(false);
  panel.setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
  panel.add(lblDay, BorderLayout.NORTH);
  panel.add(lblDate);
  panel.add(makeIndicator(date, today), BorderLayout.SOUTH);
  return panel;
}
View in GitHub: Java, Kotlin

Description

  • ロケールに基づいた週の開始曜日から一週間分のカレンダーをJTabbedPaneのタブに配置
  • JPanelでタブコンポーネントを作成し、その上部に曜日、中央に日付、下部に本日インジケーターを表示
  • 本日より前の週の開始曜日が最初に出現する日付をLocalDate startOfWeek = today.with(TemporalAdjusters.previousOrSame(firstDay))で取得 
    DayOfWeek firstDay = WeekFields.of(locale).getFirstDayOfWeek();
int diff = today.getDayOfWeek().getValue() - firstDay.getValue();
if (diff < 0) {
  diff += DayOfWeek.values().length;
}
LocalDate startOfWeek = today.minusDays(diff);
// startOfWeek = today.with(TemporalAdjusters.previousOrSame(firstDay));

Reference

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