337 lines
10 KiB
JavaScript
337 lines
10 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/**
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* DateKeeper keeps track of the date states.
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*/
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function DateKeeper(props) {
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this.init(props);
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}
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{
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const DAYS_IN_A_WEEK = 7,
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MONTHS_IN_A_YEAR = 12,
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YEAR_VIEW_SIZE = 200,
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YEAR_BUFFER_SIZE = 10,
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// The min value is 0001-01-01 based on HTML spec:
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// https://html.spec.whatwg.org/#valid-date-string
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MIN_DATE = -62135596800000,
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// The max value is derived from the ECMAScript spec (275760-09-13):
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// http://ecma-international.org/ecma-262/5.1/#sec-15.9.1.1
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MAX_DATE = 8640000000000000,
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MAX_YEAR = 275760,
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MAX_MONTH = 9;
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DateKeeper.prototype = {
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get year() {
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return this.state.dateObj.getUTCFullYear();
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},
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get month() {
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return this.state.dateObj.getUTCMonth();
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},
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get selection() {
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return this.state.selection;
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},
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/**
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* Initialize DateKeeper
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* @param {Number} year
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* @param {Number} month
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* @param {Number} day
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* @param {Number} min
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* @param {Number} max
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* @param {Number} step
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* @param {Number} stepBase
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* @param {Number} firstDayOfWeek
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* @param {Array<Number>} weekends
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* @param {Number} calViewSize
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*/
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init({ year, month, day, min, max, step, stepBase, firstDayOfWeek = 0, weekends = [0], calViewSize = 42 }) {
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const today = new Date();
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this.state = {
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step, firstDayOfWeek, weekends, calViewSize,
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// min & max are NaN if empty or invalid
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min: new Date(Number.isNaN(min) ? MIN_DATE : min),
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max: new Date(Number.isNaN(max) ? MAX_DATE : max),
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stepBase: new Date(stepBase),
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today: this._newUTCDate(today.getFullYear(), today.getMonth(), today.getDate()),
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weekHeaders: this._getWeekHeaders(firstDayOfWeek, weekends),
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years: [],
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dateObj: new Date(0),
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selection: { year, month, day },
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};
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this.setCalendarMonth({
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year: year === undefined ? today.getFullYear() : year,
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month: month === undefined ? today.getMonth() : month
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});
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},
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/**
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* Set new calendar month. The year is always treated as full year, so the
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* short-form is not supported.
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* @param {Object} date parts
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* {
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* {Number} year [optional]
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* {Number} month [optional]
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* }
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*/
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setCalendarMonth({ year = this.year, month = this.month }) {
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// Make sure the date is valid before setting.
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// Use setUTCFullYear so that year 99 doesn't get parsed as 1999
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if (year > MAX_YEAR || year === MAX_YEAR && month >= MAX_MONTH) {
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this.state.dateObj.setUTCFullYear(MAX_YEAR, MAX_MONTH - 1, 1);
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} else if (year < 1 || year === 1 && month < 0) {
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this.state.dateObj.setUTCFullYear(1, 0, 1);
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} else {
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this.state.dateObj.setUTCFullYear(year, month, 1);
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}
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},
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/**
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* Set selection date
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* @param {Number} year
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* @param {Number} month
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* @param {Number} day
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*/
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setSelection({ year, month, day }) {
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this.state.selection.year = year;
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this.state.selection.month = month;
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this.state.selection.day = day;
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},
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/**
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* Set month. Makes sure the day is <= the last day of the month
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* @param {Number} month
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*/
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setMonth(month) {
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this.setCalendarMonth({ year: this.year, month });
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},
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/**
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* Set year. Makes sure the day is <= the last day of the month
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* @param {Number} year
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*/
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setYear(year) {
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this.setCalendarMonth({ year, month: this.month });
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},
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/**
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* Set month by offset. Makes sure the day is <= the last day of the month
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* @param {Number} offset
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*/
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setMonthByOffset(offset) {
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this.setCalendarMonth({ year: this.year, month: this.month + offset });
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},
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/**
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* Generate the array of months
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* @return {Array<Object>}
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* {
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* {Number} value: Month in int
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* {Boolean} enabled
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* }
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*/
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getMonths() {
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let months = [];
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for (let i = 0; i < MONTHS_IN_A_YEAR; i++) {
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months.push({
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value: i,
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enabled: true
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});
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}
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return months;
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},
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/**
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* Generate the array of years
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* @return {Array<Object>}
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* {
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* {Number} value: Year in int
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* {Boolean} enabled
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* }
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*/
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getYears() {
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let years = [];
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const firstItem = this.state.years[0];
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const lastItem = this.state.years[this.state.years.length - 1];
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const currentYear = this.year;
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// Generate new years array when the year is outside of the first &
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// last item range. If not, return the cached result.
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if (!firstItem || !lastItem ||
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currentYear <= firstItem.value + YEAR_BUFFER_SIZE ||
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currentYear >= lastItem.value - YEAR_BUFFER_SIZE) {
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// The year is set in the middle with items on both directions
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for (let i = -(YEAR_VIEW_SIZE / 2); i < YEAR_VIEW_SIZE / 2; i++) {
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const year = currentYear + i;
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if (year >= 1 && year <= MAX_YEAR) {
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years.push({
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value: year,
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enabled: true
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});
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}
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}
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this.state.years = years;
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}
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return this.state.years;
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},
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/**
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* Get days for calendar
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* @return {Array<Object>}
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* {
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* {Date} dateObj
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* {Number} content
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* {Array<String>} classNames
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* {Boolean} enabled
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* }
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*/
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getDays() {
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const firstDayOfMonth = this._getFirstCalendarDate(this.state.dateObj, this.state.firstDayOfWeek);
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const month = this.month;
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let days = [];
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for (let i = 0; i < this.state.calViewSize; i++) {
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const dateObj = this._newUTCDate(firstDayOfMonth.getUTCFullYear(),
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firstDayOfMonth.getUTCMonth(),
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firstDayOfMonth.getUTCDate() + i);
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let classNames = [];
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let enabled = true;
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const isValid = dateObj.getTime() >= MIN_DATE && dateObj.getTime() <= MAX_DATE;
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if (!isValid) {
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classNames.push("out-of-range");
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enabled = false;
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days.push({
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classNames,
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enabled,
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});
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continue;
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}
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const isWeekend = this.state.weekends.includes(dateObj.getUTCDay());
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const isCurrentMonth = month == dateObj.getUTCMonth();
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const isSelection = this.state.selection.year == dateObj.getUTCFullYear() &&
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this.state.selection.month == dateObj.getUTCMonth() &&
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this.state.selection.day == dateObj.getUTCDate();
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const isOutOfRange = dateObj.getTime() < this.state.min.getTime() ||
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dateObj.getTime() > this.state.max.getTime();
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const isToday = this.state.today.getTime() == dateObj.getTime();
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const isOffStep = this._checkIsOffStep(dateObj,
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this._newUTCDate(dateObj.getUTCFullYear(),
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dateObj.getUTCMonth(),
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dateObj.getUTCDate() + 1));
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if (isWeekend) {
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classNames.push("weekend");
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}
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if (!isCurrentMonth) {
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classNames.push("outside");
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}
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if (isSelection && !isOutOfRange && !isOffStep) {
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classNames.push("selection");
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}
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if (isOutOfRange) {
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classNames.push("out-of-range");
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enabled = false;
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}
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if (isToday) {
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classNames.push("today");
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}
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if (isOffStep) {
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classNames.push("off-step");
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enabled = false;
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}
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days.push({
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dateObj,
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content: dateObj.getUTCDate(),
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classNames,
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enabled,
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});
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}
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return days;
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},
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/**
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* Check if a date is off step given a starting point and the next increment
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* @param {Date} start
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* @param {Date} next
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* @return {Boolean}
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*/
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_checkIsOffStep(start, next) {
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// If the increment is larger or equal to the step, it must not be off-step.
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if (next - start >= this.state.step) {
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return false;
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}
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// Calculate the last valid date
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const lastValidStep = Math.floor((next - 1 - this.state.stepBase) / this.state.step);
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const lastValidTimeInMs = lastValidStep * this.state.step + this.state.stepBase.getTime();
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// The date is off-step if the last valid date is smaller than the start date
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return lastValidTimeInMs < start.getTime();
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},
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/**
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* Get week headers for calendar
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* @param {Number} firstDayOfWeek
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* @param {Array<Number>} weekends
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* @return {Array<Object>}
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* {
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* {Number} content
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* {Array<String>} classNames
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* }
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*/
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_getWeekHeaders(firstDayOfWeek, weekends) {
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let headers = [];
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let dayOfWeek = firstDayOfWeek;
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for (let i = 0; i < DAYS_IN_A_WEEK; i++) {
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headers.push({
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content: dayOfWeek % DAYS_IN_A_WEEK,
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classNames: weekends.includes(dayOfWeek % DAYS_IN_A_WEEK) ? ["weekend"] : []
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});
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dayOfWeek++;
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}
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return headers;
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},
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/**
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* Get the first day on a calendar month
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* @param {Date} dateObj
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* @param {Number} firstDayOfWeek
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* @return {Date}
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*/
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_getFirstCalendarDate(dateObj, firstDayOfWeek) {
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const daysOffset = 1 - DAYS_IN_A_WEEK;
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let firstDayOfMonth = this._newUTCDate(dateObj.getUTCFullYear(), dateObj.getUTCMonth());
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let dayOfWeek = firstDayOfMonth.getUTCDay();
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return this._newUTCDate(
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firstDayOfMonth.getUTCFullYear(),
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firstDayOfMonth.getUTCMonth(),
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// When first calendar date is the same as first day of the week, add
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// another row on top of it.
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firstDayOfWeek == dayOfWeek ? daysOffset : (firstDayOfWeek - dayOfWeek + daysOffset) % DAYS_IN_A_WEEK);
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},
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/**
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* Helper function for creating UTC dates
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* @param {...[Number]} parts
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* @return {Date}
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*/
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_newUTCDate(...parts) {
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return new Date(new Date(0).setUTCFullYear(...parts));
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},
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};
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}
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