forked from ng-bootstrap/ng-bootstrap
/
datepicker-tools.ts
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/
datepicker-tools.ts
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import {NgbDate} from './ngb-date';
import {DatepickerViewModel, DayViewModel, MonthViewModel} from './datepicker-view-model';
import {NgbCalendar} from './ngb-calendar';
import {isDefined} from '../util/util';
import {NgbDatepickerI18n} from './datepicker-i18n';
export function isChangedDate(prev: NgbDate, next: NgbDate) {
return !dateComparator(prev, next);
}
export function isChangedMonth(prev: NgbDate, next: NgbDate) {
return !prev && !next ? false : !prev || !next ? true : prev.year !== next.year || prev.month !== next.month;
}
export function dateComparator(prev: NgbDate, next: NgbDate) {
return (!prev && !next) || (!!prev && !!next && prev.equals(next));
}
export function checkMinBeforeMax(minDate: NgbDate, maxDate: NgbDate) {
if (maxDate && minDate && maxDate.before(minDate)) {
throw new Error(`'maxDate' ${maxDate} should be greater than 'minDate' ${minDate}`);
}
}
export function checkDateInRange(date: NgbDate, minDate: NgbDate, maxDate: NgbDate): NgbDate {
if (date && minDate && date.before(minDate)) {
return minDate;
}
if (date && maxDate && date.after(maxDate)) {
return maxDate;
}
return date;
}
export function isDateSelectable(date: NgbDate, state: DatepickerViewModel) {
const {minDate, maxDate, disabled, markDisabled} = state;
// clang-format off
return !(
!isDefined(date) ||
disabled ||
(markDisabled && markDisabled(date, {year: date.year, month: date.month})) ||
(minDate && date.before(minDate)) ||
(maxDate && date.after(maxDate))
);
// clang-format on
}
export function generateSelectBoxMonths(calendar: NgbCalendar, date: NgbDate, minDate: NgbDate, maxDate: NgbDate) {
if (!date) {
return [];
}
let months = calendar.getMonths(date.year);
if (minDate && date.year === minDate.year) {
const index = months.findIndex(month => month === minDate.month);
months = months.slice(index);
}
if (maxDate && date.year === maxDate.year) {
const index = months.findIndex(month => month === maxDate.month);
months = months.slice(0, index + 1);
}
return months;
}
export function generateSelectBoxYears(date: NgbDate, minDate: NgbDate, maxDate: NgbDate) {
if (!date) {
return [];
}
const start = minDate ? Math.max(minDate.year, date.year - 500) : date.year - 10;
const end = maxDate ? Math.min(maxDate.year, date.year + 500) : date.year + 10;
const length = end - start + 1;
const numbers = Array(length);
for (let i = 0; i < length; i++) {
numbers[i] = start + i;
}
return numbers;
}
export function nextMonthDisabled(calendar: NgbCalendar, date: NgbDate, maxDate: NgbDate) {
const nextDate = Object.assign(calendar.getNext(date, 'm'), {day: 1});
return maxDate && nextDate.after(maxDate);
}
export function prevMonthDisabled(calendar: NgbCalendar, date: NgbDate, minDate: NgbDate) {
const prevDate = Object.assign(calendar.getPrev(date, 'm'), {day: 1});
return minDate && (prevDate.year === minDate.year && prevDate.month < minDate.month ||
prevDate.year < minDate.year && minDate.month === 1);
}
export function buildMonths(
calendar: NgbCalendar, date: NgbDate, state: DatepickerViewModel, i18n: NgbDatepickerI18n,
force: boolean): MonthViewModel[] {
const {displayMonths, months} = state;
// move old months to a temporary array
const monthsToReuse = months.splice(0, months.length);
// generate new first dates, nullify or reuse months
const firstDates = Array.from({length: displayMonths}, (_, i) => {
const firstDate = Object.assign(calendar.getNext(date, 'm', i), {day: 1});
months[i] = null;
if (!force) {
const reusedIndex = monthsToReuse.findIndex(month => month.firstDate.equals(firstDate));
// move reused month back to months
if (reusedIndex !== -1) {
months[i] = monthsToReuse.splice(reusedIndex, 1)[0];
}
}
return firstDate;
});
// rebuild nullified months
firstDates.forEach((firstDate, i) => {
if (months[i] === null) {
months[i] = buildMonth(calendar, firstDate, state, i18n, monthsToReuse.shift() || {} as MonthViewModel);
}
});
return months;
}
export function buildMonth(
calendar: NgbCalendar, date: NgbDate, state: DatepickerViewModel, i18n: NgbDatepickerI18n,
month: MonthViewModel = {} as MonthViewModel): MonthViewModel {
const {dayTemplateData, minDate, maxDate, firstDayOfWeek, markDisabled, outsideDays} = state;
const calendarToday = calendar.getToday();
month.firstDate = null;
month.lastDate = null;
month.number = date.month;
month.year = date.year;
month.weeks = month.weeks || [];
month.weekdays = month.weekdays || [];
date = getFirstViewDate(calendar, date, firstDayOfWeek);
// month has weeks
for (let week = 0; week < calendar.getWeeksPerMonth(); week++) {
let weekObject = month.weeks[week];
if (!weekObject) {
weekObject = month.weeks[week] = {number: 0, days: [], collapsed: true};
}
const days = weekObject.days;
// week has days
for (let day = 0; day < calendar.getDaysPerWeek(); day++) {
if (week === 0) {
month.weekdays[day] = calendar.getWeekday(date);
}
const newDate = new NgbDate(date.year, date.month, date.day);
const nextDate = calendar.getNext(newDate);
const ariaLabel = i18n.getDayAriaLabel(newDate);
// marking date as disabled
let disabled = !!((minDate && newDate.before(minDate)) || (maxDate && newDate.after(maxDate)));
if (!disabled && markDisabled) {
disabled = markDisabled(newDate, {month: month.number, year: month.year});
}
// today
let today = newDate.equals(calendarToday);
// adding user-provided data to the context
let contextUserData =
dayTemplateData ? dayTemplateData(newDate, {month: month.number, year: month.year}) : undefined;
// saving first date of the month
if (month.firstDate === null && newDate.month === month.number) {
month.firstDate = newDate;
}
// saving last date of the month
if (newDate.month === month.number && nextDate.month !== month.number) {
month.lastDate = newDate;
}
let dayObject = days[day];
if (!dayObject) {
dayObject = days[day] = {} as DayViewModel;
}
dayObject.date = newDate;
dayObject.context = Object.assign(dayObject.context || {}, {
$implicit: newDate,
date: newDate,
data: contextUserData,
currentMonth: month.number,
currentYear: month.year, disabled,
focused: false,
selected: false, today
});
dayObject.tabindex = -1;
dayObject.ariaLabel = ariaLabel;
dayObject.hidden = false;
date = nextDate;
}
weekObject.number = calendar.getWeekNumber(days.map(day => day.date), firstDayOfWeek);
// marking week as collapsed
weekObject.collapsed = outsideDays === 'collapsed' && days[0].date.month !== month.number &&
days[days.length - 1].date.month !== month.number;
}
return month;
}
export function getFirstViewDate(calendar: NgbCalendar, date: NgbDate, firstDayOfWeek: number): NgbDate {
const daysPerWeek = calendar.getDaysPerWeek();
const firstMonthDate = new NgbDate(date.year, date.month, 1);
const dayOfWeek = calendar.getWeekday(firstMonthDate) % daysPerWeek;
return calendar.getPrev(firstMonthDate, 'd', (daysPerWeek + dayOfWeek - firstDayOfWeek) % daysPerWeek);
}