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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { DatePipe } from '@angular/common';
import {
ChangeDetectionStrategy,
Component,
computed,
HostListener,
input,
model,
OnChanges,
output,
SimpleChanges
} from '@angular/core';
import { isRTL } from '@siemens/element-ng/common';
import {
addMonthsInRange,
createDate,
getFirstDateInYear,
isAfterYear,
isAnotherYear,
isSameYear,
today as getToday
} from '../date-time-helper';
import { Cell, SiCalendarBodyComponent } from './si-calendar-body.component';
import { SiCalendarDirectionButtonComponent } from './si-calendar-direction-button.component';
import { MonthCompareAdapter } from './si-compare-adapter';
import { SiInitialFocusComponent } from './si-initial-focus.component';
/**
* Show months of a single year as table and handles the keyboard interactions.
* The focus and focusedDate is handled according the keyboard interactions.
*/
@Component({
selector: 'si-month-selection',
imports: [SiCalendarDirectionButtonComponent, SiCalendarBodyComponent, DatePipe],
templateUrl: './si-month-selection.component.html',
changeDetection: ChangeDetectionStrategy.OnPush
})
export class SiMonthSelectionComponent extends SiInitialFocusComponent implements OnChanges {
/**
* The translated list of months.
*
* @defaultValue []
*/
readonly months = input<string[]>([]);
/**
* The active date, the cell which will receive the focus.
*/
readonly focusedDate = model.required<Date>();
/** Emits when the active focused date is 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'>();
/** Listen Escape event to switch view back */
@HostListener('keydown.Escape', ['$event'])
triggerEsc(event: Event): void {
this.selectedValueChange.emit(null);
event.preventDefault();
event.stopPropagation(); // Prevents the overlay from closing.
}
/**
* The current visible list of calendar months.
* Every time the focusedDate changes to another year the list will update.
*/
protected monthCells: Cell[][] = [];
protected compareAdapter = new MonthCompareAdapter();
/** Number of column before the row is wrapped */
private readonly columnCount = 2;
/**
* 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 && (isSameYear(focusedDate, minDate) || isAfterYear(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 && (isSameYear(focusedDate, maxDate) || isAfterYear(focusedDate, maxDate));
});
ngOnChanges(changes: SimpleChanges): void {
if (
changes.maxDate ||
changes.minDate ||
changes.maxMonth ||
changes.minMonth ||
changes.focusedDate
) {
this.initView();
}
}
protected calendarBodyKeyDown(event: KeyboardEvent): void {
const isRtl = isRTL();
switch (event.key) {
case 'ArrowLeft':
this.updateFocusedDate(isRtl ? 1 : -1);
break;
case 'ArrowRight':
this.updateFocusedDate(isRtl ? -1 : 1);
break;
case 'ArrowUp':
this.updateFocusedDate(-1 * this.columnCount);
break;
case 'ArrowDown':
this.updateFocusedDate(this.columnCount);
break;
case 'Escape':
this.selectedValueChange.emit(null);
event.preventDefault();
event.stopPropagation(); // Prevents the overlay from closing.
return;
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 updateFocusedDate(offset: number): void {
const prevDate = this.focusedDate();
const newDate = addMonthsInRange(prevDate, offset, this.minDate(), this.maxDate());
this.focusedDate.set(newDate);
if (!this.compareAdapter.isEqual(prevDate, newDate)) {
// Synchronize focusedDate with year view
this.focusActiveCell();
this.emitActiveMonthChange(newDate, prevDate);
}
}
/**
* Add offset to year and update focusedDate.
*/
protected setYearOffset(offset: number): void {
const prevDate = this.focusedDate();
const newActive = createDate(prevDate);
newActive.setFullYear(newActive.getFullYear() + offset);
this.focusedDate.set(newActive);
this.emitActiveMonthChange(newActive, prevDate);
}
protected emitSelectedValue(selected: Date): void {
this.selectedValueChange.emit(selected);
}
protected emitFocusedDate(focused: Date): void {
// Take over the current day on month changes
focused.setDate(this.focusedDate().getDate());
this.focusedDate.set(focused);
}
protected emitActiveMonthChange(focus: Date, prevFocus: Date): void {
if (isAnotherYear(focus, prevFocus)) {
this.activeMonthChange.emit(focus);
}
}
protected emitViewChange(): void {
this.viewChange.emit('year');
}
/**
* Initialize view based on the focusedDate.
*/
private initView(): void {
this.monthCells = [];
let row: Cell[] = [];
// The cell date object needs to be the first to prevent that we jump to the next month when
// setting the month. For example the focusedDate is 31. setting february would result in the
// 3. March.
const startDate = getFirstDateInYear(this.focusedDate());
const today = getToday();
const months = this.months();
for (let i = 0; i <= 11; i++) {
if (i > 0 && i % this.columnCount === 0) {
this.monthCells.push(row);
row = [];
}
const date = new Date(startDate);
date.setMonth(i);
const isToday = this.compareAdapter.isEqual(date, today);
const isDisabled = !this.compareAdapter.isEqualOrBetween(
date,
this.minDate(),
this.maxDate()
);
row.push({
value: date.getDate(),
disabled: isDisabled,
ariaLabel: `${months[date.getMonth()]} ${this.focusedDate().getFullYear()}`,
displayValue: months[date.getMonth()],
isPreview: false,
isToday,
valueRaw: createDate(date),
cssClasses: ['month', 'si-h4', 'text-truncate']
});
}
this.monthCells.push(row);
}
}
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