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| /**
| * library to play around with date, year, month.
| * */
| import {weekDayOfDate, countDaysOfMonth} from "./chronos.js";
|
|
| /**
| * represents a monthly calendar-sheet, contains required data to generate a view of a Calendar-month.
| * */
| export const Calendar = {
| /**
| * Define the first day of a week, which is shown in a Calendar View
| * Days of week are coded as follows:
| * 0 → Sunday, 1 → Monday, 2 → Tuesday, ... , 6 → Saturday
| * we set firstDayOfWeek by default to 1.
| * It is Monday, as convenient in Germany.
| * */
| _firstDayOfWeek: 1,
| get firstDayOfWeek() {
| return this._firstDayOfWeek;
| },
| set firstDayOfWeek(firstDayOfWeek) {
| this._firstDayOfWeek = firstDayOfWeek;
| },
| /**
| * return an object with following structure:
| *
| * ```{
| * month: 1,
| * year: 1970,
| * weekdays: [1, 2, 3, 4, 5, 6, 0],
| * weeks: [
| * ["","","", 1, 2, 3, 4],
| * [5, 6, 7, 8, 9,10,11],
| * [12,13,14,15,16,17,18],
| * [19,20,21,22,23,24,25],
| * [26,27,28,29,30,31,""]
| * ]
| * }```
| *
| * this structure is intended to be used to create a View of Calendar without
| * further calculation.
| *
| * @param {number} month
| * @param {number} year
| *
| * */
| buildCalendar : function(month, year) {
| let cal = {
| month: month,
| year: year,
| weekDays: [],
| weeks:[]
| };
| const DAYS_IN_WEEK = 7;
| for(let i = 0; i < DAYS_IN_WEEK; ++i) {
| let d = (i + Calendar._firstDayOfWeek) % DAYS_IN_WEEK;
| cal.weekDays.push(d);
| }
| // calculate how many days of last month get place in the first week
| // of this month
| let dayOfFirstDate = weekDayOfDate(1, month, year);
| let diff = (7 + (dayOfFirstDate - Calendar._firstDayOfWeek)) % 7;
| let countSpace = diff;
| let firstWeek = [];
| while(countSpace-- > 0) {
| firstWeek.push("");
| }
| // append days of first week
| let d = 1;
| for (; d + diff <= 7; d++) {
| firstWeek.push(d);
| }
| // append the first week to result
| cal.weeks.push(firstWeek);
| // append the further weeks (2. 3. 4. maybe 5.) to result
| let daysOfMonth = countDaysOfMonth(month, year);
| let week = [];
| for(;d <= daysOfMonth; ++d) {
| week.push(d);
| if ( (d + diff) % 7 === 0 ) {
| cal.weeks.push(week);
| week = [];
| }
| }
| if (week.length > 0) {
| cal.weeks.push(week);
| }
| return cal;
| }
| }
|
|
