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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { DatePipe } from '@angular/common';
import {
booleanAttribute,
ChangeDetectionStrategy,
Component,
computed,
inject,
input,
LOCALE_ID,
model,
output
} from '@angular/core';
import { isRTL } from '@siemens/element-ng/common';
import { SiTranslatePipe, TranslatableString } from '@siemens/element-translate-ng/translate';
import {
addDaysInRange,
addMonthsInRange,
createDate,
getDayStrings,
getFirstDateInMonth,
getLastDateInMonth,
getWeekEndDate,
getWeekOfYear,
getWeekStartDate,
isAfterMonth,
isAnotherMonthOrYear,
isSameDate,
isSameMonth,
isSameOrBetween,
today
} from '../date-time-helper';
import { WeekStart } from '../si-datepicker.model';
import { Cell, SiCalendarBodyComponent } from './si-calendar-body.component';
import { SiCalendarDirectionButtonComponent } from './si-calendar-direction-button.component';
import { DayCompareAdapter } from './si-compare-adapter';
import { SiInitialFocusComponent } from './si-initial-focus.component';
/**
* Show dates of a single month as table and handles the keyboard interactions.
* The focusedDate is handled according the keyboard interactions.
*/
@Component({
selector: 'si-day-selection',
imports: [DatePipe, SiCalendarBodyComponent, SiCalendarDirectionButtonComponent, SiTranslatePipe],
templateUrl: './si-day-selection.component.html',
changeDetection: ChangeDetectionStrategy.OnPush
})
export class SiDaySelectionComponent extends SiInitialFocusComponent {
/**
* Indicate whether the week numbers shall be hidden.
*
* @defaultValue false
*/
readonly hideWeekNumbers = input(false, { transform: booleanAttribute });
/**
* Defines the starting day of the week. Default is `monday`.
*
* @defaultValue 'monday'
*/
readonly weekStartDay = input<WeekStart>('monday');
/**
* The active date, the cell which will receive the focus.
* @defaultValue calendarUtils.today()
*/
readonly focusedDate = model.required<Date>();
/** Today button text */
readonly todayLabel = input<TranslatableString>();
/** Aria label for calendar week column */
readonly calendarWeekLabel = input<TranslatableString>();
/** Emits when the active focused date changed to another month / year, typically during keyboard navigation */
readonly activeMonthChange = output<Date>();
/** Emits when the user requests a different to show a different view */
readonly viewChange = output<'year' | 'month'>();
/** The translated list of week days. */
protected readonly days = computed(() => getDayStrings(this.locale, this.weekStartDay()));
/** The week numbers which are shown as row label */
protected readonly weekNumbers = computed(() =>
this.weeks().map(w => getWeekOfYear(w[0].valueRaw, this.weekStartDay()).toString())
);
/**
* The current visible list of calendar days.
* Every time the focusedDate changes to either another month or year the list will be rebuild.
*/
protected readonly weeks = computed(() => {
const focusedDate = this.focusedDate();
const monthStart = getFirstDateInMonth(focusedDate);
const monthEnd = getLastDateInMonth(focusedDate);
/**
* We start the month with the first day in the week which has the effect that dates are
* visible which aren't in the active month.
*/
const startDate = getWeekStartDate(monthStart, this.weekStartDay());
const minDate = this.minDate();
const maxDate = this.maxDate();
const weeks: Cell[][] = [[], [], [], [], [], []];
let weekIndex = 0;
for (
let i = 0, date = new Date(startDate);
weeks[weeks.length - 1].length < 7;
i++, date.setDate(date.getDate() + 1)
) {
if (i > 0 && i % 7 === 0) {
weekIndex++;
}
const activeMonth = isSameOrBetween(date, monthStart, monthEnd);
const isToday = isSameDate(date, today());
const outOfRange = !isSameOrBetween(date, minDate, maxDate);
weeks.at(weekIndex)?.push({
value: date.getDate(),
disabled: outOfRange,
ariaLabel: date.toDateString(),
displayValue: date.getDate().toString(),
isPreview: !activeMonth,
isToday,
valueRaw: createDate(date),
cssClasses: ['day', activeMonth ? 'si-h4' : 'si-body-lg']
});
}
return weeks;
});
/** Compare date based on the current view */
protected compareAdapter = new DayCompareAdapter();
/** Disable today button if it is the same month */
protected readonly isTodayButtonDisabled = computed(() =>
isSameMonth(today(), this.focusedDate())
);
/**
* Indicate the previous button shall be disabled.
* This happens when the focusedDate is equal or before the minDate.
*/
protected readonly isPreviousButtonDisabled = computed(() => {
const minDate = this.minDate();
const focusedDate = this.focusedDate();
return minDate && (isSameMonth(focusedDate, minDate) || isAfterMonth(minDate, focusedDate));
});
/**
* Indicate the next button shall be disabled.
* This happens when the focusedDate is equal or after the maxDate.
*/
protected readonly isNextButtonDisabled = computed(() => {
const maxDate = this.maxDate();
const focusedDate = this.focusedDate();
return maxDate && (isSameMonth(focusedDate, maxDate) || isAfterMonth(focusedDate, maxDate));
});
private readonly locale = inject(LOCALE_ID).toString();
protected calendarBodyKeyDown(event: KeyboardEvent): void {
const isRtl = isRTL();
switch (event.key) {
case 'ArrowLeft':
this.updateFocusedDateByDay(isRtl ? 1 : -1);
break;
case 'ArrowRight':
this.updateFocusedDateByDay(isRtl ? -1 : 1);
break;
case 'ArrowUp':
this.updateFocusedDateByDay(-7);
break;
case 'ArrowDown':
this.updateFocusedDateByDay(7);
break;
case 'Home':
this.updateFocusedDate(getWeekStartDate(this.focusedDate(), this.weekStartDay()));
break;
case 'End':
this.updateFocusedDate(getWeekEndDate(this.focusedDate(), this.weekStartDay()));
break;
case 'PageDown':
this.updateFocusedDateByMonth(1);
break;
case 'PageUp':
this.updateFocusedDateByMonth(-1);
break;
case 'Enter':
case 'Space':
default:
// Don't prevent default or focus active cell on keys that we don't explicitly handle.
return;
}
// Prevent unexpected default actions such as form submission.
event.preventDefault();
}
protected updateFocusedDateByDay(offset: number): void {
this.updateFocusedDate(
addDaysInRange(this.focusedDate(), offset, this.minDate(), this.maxDate())
);
}
protected updateFocusedDateByMonth(offset: number): void {
this.updateFocusedDate(
addMonthsInRange(this.focusedDate(), offset, this.minDate(), this.maxDate())
);
}
protected updateFocusedDate(newDate: Date): void {
const prevDate = this.focusedDate();
if (!isSameDate(prevDate, newDate)) {
this.focusedDate.set(newDate);
if (isAnotherMonthOrYear(newDate, prevDate)) {
this.activeMonthChange.emit(newDate);
}
this.focusActiveCell();
}
}
/**
* Update month of focusedDate.
* @param offset -1 or -1.
*/
protected setMonthOffset(offset: number): void {
// Only update emit focusedDate since the focus shall stay on the button.
const actualMonth = addMonthsInRange(
this.focusedDate(),
offset,
this.minDate(),
this.maxDate()
);
this.focusedDate.set(actualMonth);
this.activeMonthChange.emit(actualMonth);
}
/** Change the focusedDate to today */
protected goToToday(): void {
this.focusedDate.set(today());
this.focusActiveCell();
}
protected emitSelectedValue(selected: Date): void {
if (selected !== this.startDate() || selected !== this.endDate()) {
this.selectedValueChange.emit(selected);
}
}
protected emitActiveDate(active: Date): void {
this.focusedDate.set(active);
}
protected emitViewChange(view: 'year' | 'month'): void {
this.viewChange.emit(view);
}
}
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