calendar-proof-concept

readme.md

calendar-proof-concept

dart -> flutter calendar proof of concept

Find this at dartpad.dartlang.org/?source=f5399510-0ef8-44b9-8292-c50769e81f2a.

Created with <3 with dartpad.dartlang.org.

main.dart

void main() {
  var now = new DateTime(2013, 1, 10);
  var year = now.year;
  var month = now.month;
  
  DateTime firstDay = new DateTime(year, month, 1);
  DateTime lastDay = new DateTime(year, month + 1, 0);

  List<Day> monthDays = new List<Day>();
  
  for (var i = firstDay.day; i <= lastDay.day; i++) {
    monthDays.add(new Day(date: new DateTime(year, month, i)));
  }
  
  // INFO: build month padding - beginning
  var firstWeekday = firstDay.weekday;
  DateTime lastDayPrevMonth = new DateTime(year, month, 0);
  if (firstWeekday < 7) {
    for (var i = 0; i < firstWeekday; i++) {
      monthDays.insert(
        0,
        new Day(date: new DateTime(year, month - 1, lastDayPrevMonth.day - i))
      );
    }
  }
  // INFO: build month padding - ending
  var lastWeekday = lastDay.weekday;
  DateTime firstDayNextMonth = new DateTime(year, month + 1, 1);
  var remainingDays = (6 - lastWeekday == -1) ? 6 : (6 - lastWeekday);
  for (var i = 0; i < remainingDays; i++) {
    monthDays.add(
      new Day(date: new DateTime(year, month + 1, firstDayNextMonth.day + i))
    );
  }
  
  // CONSOLE LOG TESTING
  monthDays.forEach((day) => day.showDate());
  print("count: " + monthDays.length.toString());
  
  // INFO: generate weeks in this month
  List<Week> monthWeeks = new List<Week>();
 	for (var weeknum = 0; weeknum < (monthDays.length / 7); weeknum++) {
    print("weeknum: " + weeknum.toString());
    List<Day> weekDays = new List<Day>();
    for (var weekday = (weeknum * 7); weekday < (weeknum * 7) + 7; weekday++) {
      print("weekday: " + weekday.toString());
      weekDays.add(monthDays[weekday]);
    }
    monthWeeks.add(new Week(days: weekDays));
  }
  
  Month currentMonth = new Month(year: year, month: month, weeks: monthWeeks);
  print(Month.days[0]['short']);
}

class Day {
  Day({ DateTime this.date });
  DateTime date;
  showDate() => print(date.month.toString() + ": " + date.day.toString());
}

class Week {
  Week({ List<Day> this.days });
  List<Day> days;
}

class Month {
  Month({ int this.year, int this.month, List<Week> weeks });
  int year;
  int month;
  List<Week> weeks;
  static final days = {
    0: { 'short': 'Mon', 'long' : 'Monday' },
    1: { 'short': 'Tue', 'long': 'Tuesday' },
    2: { 'short': 'Wed', 'long': 'Wednesday' },
    3: { 'short': 'Thur', 'long': 'Thursday' },
    4: { 'short': 'Fri', 'long': 'Friday' },
    5: { 'short': 'Sat', 'long': 'Saturday' },
    6: { 'short': 'Sun', 'long': 'Sunday' }
  };
}