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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
A11yModule,
ConfigurableFocusTrap,
ConfigurableFocusTrapFactory,
FocusMonitor
} from '@angular/cdk/a11y';
import {
booleanAttribute,
ChangeDetectionStrategy,
Component,
computed,
ElementRef,
inject,
input,
model,
OnChanges,
OnDestroy,
OnInit,
output,
signal,
SimpleChanges,
viewChild,
DOCUMENT
} from '@angular/core';
import { Cell } from './components/si-calendar-body.component';
import { isValid, nextMonth, previousMonth } from './date-time-helper';
import { SiDatepickerComponent } from './si-datepicker.component';
import { DatepickerConfig, DateRange } from './si-datepicker.model';
@Component({
selector: 'si-datepicker-overlay',
imports: [SiDatepickerComponent, A11yModule],
template: `
<si-datepicker
#datepicker
tabindex="-1"
[initialFocus]="initialFocus()"
[config]="firstDatepickerConfig()"
[class.first-datepicker]="isTwoMonthDateRange() && !isMobile()"
[class.first-datepicker-mobile]="isTwoMonthDateRange() && isMobile()"
[date]="date()"
[dateRange]="dateRange()"
[dateRangeRole]="isTwoMonthDateRange() ? 'START' : undefined"
[time12h]="time12h()"
[timepickerLabel]="firstDatepickerConfig().startTimeLabel"
[maxMonth]="maxMonth()"
[rangeType]="rangeType()"
[(activeHover)]="activeHover"
(dateChange)="date.set($event)"
(dateRangeChange)="dateRange.set($event)"
(disabledTimeChange)="disableTime = $event; disabledTimeChange.emit($event)"
(focusedDateChange)="firstDatepickerFocusDateChange($event)"
(rangeTypeChange)="rangeType.set($event)"
/>
@if (isTwoMonthDateRange()) {
<si-datepicker
#datepickerTwo
class="mh-100 overflow-auto"
tabindex="-1"
dateRangeRole="END"
[class.second-datepicker]="!isMobile()"
[class.second-datepicker-mobile]="isMobile()"
[hideTimeToggle]="true"
[initialFocus]="initialFocus()"
[config]="secondDatepickerConfig()"
[date]="date()"
[hideCalendar]="isMobile()"
[minMonth]="minMonth()"
[dateRange]="dateRange()"
[disabledTime]="disableTime"
[time12h]="time12h()"
[timepickerLabel]="secondDatepickerConfig().endTimeLabel"
[rangeType]="rangeType()"
[(activeHover)]="activeHover"
(dateRangeChange)="dateRange.set($event)"
(focusedDateChange)="secondDatepickerFocusDateChange($event)"
(rangeTypeChange)="rangeType.set($event)"
/>
}
`,
styleUrl: './si-datepicker-overlay.component.scss',
changeDetection: ChangeDetectionStrategy.Default,
host: {
class: 'mt-md-1 d-flex elevation-2 rounded-2 overflow-auto align-items-stretch',
'[class.flex-wrap]': 'isMobile()',
'[class.mobile-datepicker-overlay]': 'isMobile()',
'[class.fade]': 'isMobile()',
'[class.show]': 'completeAnimation()'
}
})
export class SiDatepickerOverlayComponent implements OnChanges, OnInit, OnDestroy {
protected readonly minMonth = signal<Date | undefined>(undefined);
protected readonly maxMonth = signal<Date | undefined>(undefined);
protected readonly datepicker = viewChild.required(SiDatepickerComponent);
/**
* {@inheritDoc SiDatepickerComponent#initialFocus}
* @defaultValue false
*/
readonly initialFocus = input(false, { transform: booleanAttribute });
/**
* {@inheritDoc SiDatepickerComponent#config}
* @defaultValue
* ```
* {}
* ```
*/
readonly config = input<DatepickerConfig>({});
/**
* {@inheritDoc SiDatepickerComponent#date}
*/
readonly date = model<Date>();
/**
* {@inheritDoc SiDatepickerComponent#dateRange}
*/
readonly dateRange = model<DateRange>();
/**
* {@inheritDoc SiDatepickerComponent#rangeType}
*/
readonly rangeType = model<'START' | 'END'>();
/**
* {@inheritDoc SiDatepickerComponent#time12h}
* @defaultValue false
*/
readonly time12h = input(false, { transform: booleanAttribute });
/**
* Emits an event to notify about disabling the time from the datepicker.
* When time is disable, we construct a pure date object in UTC 00:00:00 time.
*/
readonly disabledTimeChange = output<boolean>();
private readonly document = inject(DOCUMENT);
private readonly elementRef = inject(ElementRef);
private readonly focusMonitor = inject(FocusMonitor);
private readonly focusTrapFactory = inject(ConfigurableFocusTrapFactory);
private focusTrap!: ConfigurableFocusTrap;
private previousActiveElement?: Element | HTMLElement;
protected disableTime = false;
protected activeHover?: Cell;
protected readonly isTwoMonthDateRange = computed(
() =>
!!this.config().enableDateRange &&
(!!this.config().enableTwoMonthDateRange || !!this.config().showTime)
);
protected readonly firstDatepickerConfig = signal<DatepickerConfig>({});
protected readonly secondDatepickerConfig = signal<DatepickerConfig>({});
/**
* Indicate that the overlay is opened in small screen.
* A modal dialog animation display when true and a wrapped two month calendar layout is displayed.
*
* @defaultValue false
*/
readonly isMobile = input(false);
protected readonly completeAnimation = signal(false);
ngOnChanges(changes: SimpleChanges): void {
if (changes.config) {
const config = this.config();
this.firstDatepickerConfig.set(
!this.isTwoMonthDateRange ? config : { ...config, hideLabels: true }
);
this.secondDatepickerConfig.set({ ...config, hideLabels: true });
}
const dateRange = this.dateRange();
if (
changes.config?.currentValue?.onlyMonthSelection &&
this.isTwoMonthDateRange() &&
dateRange?.start
) {
this.minMonth.set(new Date(dateRange?.start.getFullYear(), 0, 1));
}
this.rangeType.set('START');
if (
isValid(changes.dateRange?.currentValue?.start) &&
!isValid(changes.dateRange?.currentValue?.end)
) {
this.rangeType.set('END');
}
}
ngOnInit(): void {
this.focusTrap = this.focusTrapFactory.create(this.elementRef.nativeElement);
this.previousActiveElement = this.document.activeElement ?? undefined;
Iif (this.isMobile()) {
setTimeout(() => this.completeAnimation.set(true), 150);
}
}
ngOnDestroy(): void {
this.focusMonitor.stopMonitoring(this.elementRef);
this.focusTrap.destroy();
if (this.initialFocus() && this.previousActiveElement && 'focus' in this.previousActiveElement)
this.previousActiveElement.focus();
}
/**
* Focus active cell in the current datepicker view.
*/
focusActiveCell(): void {
this.datepicker().focusActiveCell();
}
protected firstDatepickerFocusDateChange(newFocusedDate?: Date): void {
Iif (!newFocusedDate) {
return;
}
if (this.config()?.onlyMonthSelection) {
this.minMonth.set(new Date(newFocusedDate.getFullYear() + 1, 0, 1));
} else if (newFocusedDate !== this.maxMonth()) {
this.minMonth.set(nextMonth(newFocusedDate));
}
}
protected secondDatepickerFocusDateChange(newFocusedDate?: Date): void {
if (newFocusedDate && newFocusedDate !== this.minMonth()) {
if (this.config()?.onlyMonthSelection) {
this.maxMonth.set(new Date(newFocusedDate.getFullYear() - 1, 11, 31));
} else {
this.maxMonth.set(previousMonth(newFocusedDate));
}
}
}
}
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