CalendarGridData constructor

CalendarGridData({ required int month, required int year, })

Creates calendar grid data for the specified month and year.

Automatically calculates and includes dates from previous and next months to fill complete weeks in the grid.

Implementation

factory CalendarGridData({required int month, required int year}) {
  DateTime firstDayOfMonth = DateTime(year, month, 1);
  int daysInMonth = DateTime(year, month == 12 ? 1 : month + 1, 0).day;

  int prevMonthDays = firstDayOfMonth.weekday;
  DateTime prevMonthLastDay =
      firstDayOfMonth.subtract(Duration(days: prevMonthDays));

  List<CalendarGridItem> items = [];

  int itemCount = 0;

  if (prevMonthDays < 7) {
    for (int i = 0; i < prevMonthDays; i++) {
      int currentItemIndex = itemCount++;
      items.add(CalendarGridItem(
        prevMonthLastDay.add(Duration(days: i)),
        currentItemIndex % 7,
        true,
        currentItemIndex ~/ 7,
      ));
    }
  }

  for (int i = 0; i < daysInMonth; i++) {
    int currentItemIndex = itemCount++;
    DateTime currentDay = DateTime(year, month, i + 1);
    items.add(CalendarGridItem(
      currentDay,
      currentItemIndex % 7,
      false,
      currentItemIndex ~/ 7,
    ));
  }

  int remainingDays = (7 - (items.length % 7)) % 7;
  DateTime nextMonthFirstDay = DateTime(year, month + 1, 1);

  if (remainingDays < 7) {
    for (int i = 0; i < remainingDays; i++) {
      int currentItemIndex = itemCount++;
      items.add(CalendarGridItem(
        nextMonthFirstDay.add(Duration(days: i)),
        currentItemIndex % 7,
        true,
        currentItemIndex ~/ 7,
      ));
    }
  }

  return CalendarGridData._(month, year, items);
}