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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { BreakpointObserver, MediaMatcher } from '@angular/cdk/layout';
import { ConnectionPositionPair, Overlay, OverlayRef } from '@angular/cdk/overlay';
import { ComponentPortal } from '@angular/cdk/portal';
import {
ComponentRef,
DestroyRef,
Directive,
ElementRef,
inject,
OnDestroy,
output,
signal
} from '@angular/core';
import { outputToObservable, takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { getOverlayPositions, isRTL, positions } from '@siemens/element-ng/common';
import { BOOTSTRAP_BREAKPOINTS } from '@siemens/element-ng/resize-observer';
import { merge, Observable, Subject } from 'rxjs';
import { filter, map, skip, takeUntil, tap } from 'rxjs/operators';
import { SiDatepickerOverlayComponent } from './si-datepicker-overlay.component';
import { DatepickerConfig, DateRange } from './si-datepicker.model';
// eslint-disable-next-line no-restricted-syntax
export enum CloseCause {
Backdrop = 'backdrop',
Detach = 'detach',
Escape = 'escape',
Select = 'select'
}
export type DatepickerInput = {
config: DatepickerConfig;
date: Date;
dateRange: DateRange;
rangeType: 'START' | 'END';
time12h: boolean;
showTime: true;
};
/** Partial datepicker inputs */
export type DatepickerInputPartial = Partial<DatepickerInput>;
/**
* Directive with the responsibility to open/close datepicker overlay.
*/
@Directive({
selector: '[siDatepickerOverlay]',
exportAs: 'siDatepickerOverlay'
})
export class SiDatepickerOverlayDirective implements OnDestroy {
/**
* Position of the datepicker overlay. Accepts an array of positions or a single position.
* The position will be chosen based on the first position that fits into the viewport.
* The input is necessary since the positions between the siDatepicker directive and si-date-range
* component are different.
* @internal
*/
readonly placement = signal<keyof typeof positions | ConnectionPositionPair[]>([
{
overlayX: 'start',
overlayY: 'top',
originX: 'start',
originY: 'bottom'
},
{
overlayX: 'start',
overlayY: 'bottom',
originX: 'start',
originY: 'top'
}
]);
/**
* Output event on closing datepicker e.g. by clicking backdrop or escape key.
*/
readonly siDatepickerClose = output<CloseCause>();
private overlayRef?: OverlayRef;
private datepickerRef?: ComponentRef<SiDatepickerOverlayComponent>;
private autoCloseSelection = new Subject<void>();
/** Guard for siDatepickerClose event emitter to make sure the cause is emitter just once */
private ignoreClose = false;
private readonly overlay = inject(Overlay);
private readonly triggerElementRef = inject(ElementRef);
private readonly mediaMatcher = inject(MediaMatcher);
private readonly breakpointObserver = inject(BreakpointObserver);
private readonly destroyRef = inject(DestroyRef);
/**
* When the media query matches on open the overlay is displayed like a modal dialog.
* In case, users change the screen size to the matching media query we close the overlay
* if it is open with a connected overlay strategy.
*/
private readonly smallScreenQuery = `(max-width: ${BOOTSTRAP_BREAKPOINTS.mdMinimum}px) or (max-height: ${BOOTSTRAP_BREAKPOINTS.smMinimum}px)`;
ngOnDestroy(): void {
this.overlayRef?.dispose();
this.datepickerRef = undefined;
}
/**
* Show datepicker overlay.
* @param focus - move focus to the datepicker.
* @returns create datepicker overlay instance
*/
showOverlay(
focus = false,
inputs?: DatepickerInputPartial
): ComponentRef<SiDatepickerOverlayComponent> {
return this.showDatepicker().setInputs(inputs).focus(focus).datepickerRef!;
}
/**
* Close datepicker.
*/
closeOverlay(): undefined {
if (this.overlayRef?.hasAttached()) {
this.overlayRef?.detach();
this.overlayRef?.dispose();
}
this.datepickerRef = undefined;
return undefined;
}
/**
* Focus active cell in datepicker.
* @param focus - show transfer focus.
* @returns current instance.
*/
focus(focus = true): this {
if (focus) {
this.datepickerRef?.setInput('initialFocus', true);
this.datepickerRef?.instance.focusActiveCell();
this.datepickerRef?.changeDetectorRef.markForCheck();
}
return this;
}
/**
* Indicate the datepicker is visible.
* @returns is visible.
*/
isShown(): ComponentRef<SiDatepickerOverlayComponent> | undefined {
return this.datepickerRef;
}
/** Set datepicker inputs */
setInputs(inputs?: DatepickerInputPartial): this {
if (this.datepickerRef && inputs) {
Object.entries(inputs).forEach(([key, value]) => {
this.datepickerRef!.setInput(key.toString(), value);
});
}
return this;
}
/** Close overlay with cause select, which will recover the focus */
closeAfterSelection(): void {
this.autoCloseSelection.next();
}
/** Indicate whether the HTML element is a child of the datepicker overlay. */
contains(element: HTMLElement): boolean {
if (!element) {
return false;
}
return this.overlayRef?.overlayElement?.contains(element) ?? false;
}
private showDatepicker(): this {
Iif (this.overlayRef?.hasAttached()) {
return this;
}
// Since the connected overlay strategy has some limitations in small screens e.g.
// the overlay is moved via style top without recalculating the (max)height which
// can result in a cut of time picker.
// To overcome this issue the overlay use the global position strategy in small screens.
const smallScreen = this.mediaMatcher.matchMedia(this.smallScreenQuery).matches;
Iif (smallScreen) {
this.createMobileOverlay();
} else {
this.createDesktopOverlay();
}
this.closeStream(this.overlayRef!)
.pipe(
takeUntilDestroyed(this.destroyRef),
takeUntil(outputToObservable(this.siDatepickerClose))
)
.subscribe(cause => {
// The handler is called multiple times since we need to listen to detach events
if (this.datepickerRef && !this.ignoreClose) {
this.ignoreClose = true;
this.closeOverlay();
this.ignoreClose = false;
this.siDatepickerClose.emit(cause);
}
});
const portal = new ComponentPortal(SiDatepickerOverlayComponent);
this.datepickerRef = this.overlayRef!.attach(portal);
Iif (smallScreen) {
this.datepickerRef.setInput('isMobile', true);
}
// Automatically close the overlay if we reach the small screen breakpoint
// and the picker does not use the global position strategy.
this.breakpointObserver
.observe(this.smallScreenQuery)
.pipe(
takeUntilDestroyed(this.destroyRef),
takeUntil(outputToObservable(this.siDatepickerClose)),
skip(1)
)
.subscribe(() => this.closeOverlay());
return this;
}
protected createMobileOverlay(): void {
this.overlayRef = this.overlay.create({
positionStrategy: this.overlay.position().global().centerHorizontally().centerVertically(),
direction: isRTL() ? 'rtl' : 'ltr',
hasBackdrop: true,
backdropClass: 'modal-backdrop'
});
}
protected createDesktopOverlay(): void {
const popoverPositions = getOverlayPositions(this.triggerElementRef, this.placement(), false);
this.overlayRef = this.overlay.create({
positionStrategy: this.overlay
.position()
.flexibleConnectedTo(this.triggerElementRef)
.withPositions(popoverPositions)
.withPush(true)
.withGrowAfterOpen(true)
.withFlexibleDimensions(true)
.withViewportMargin(4),
direction: isRTL() ? 'rtl' : 'ltr',
hasBackdrop: true,
backdropClass: 'cdk-overlay-transparent-backdrop'
});
}
/**
* Merge events which shall close the overlay
* @param overlayRef - source for backdrop, detach or escape events.
* @returns merged observable
*/
private closeStream(overlayRef: OverlayRef): Observable<CloseCause> {
return merge(
this.autoCloseSelection.pipe(map(() => CloseCause.Select)),
overlayRef.backdropClick().pipe(map(() => CloseCause.Backdrop)),
overlayRef.detachments().pipe(map(() => CloseCause.Detach)),
overlayRef.keydownEvents().pipe(
filter(event => event.key === 'Escape'),
tap(event => event.stopPropagation()), // ESC handled, prevent closing modal, etc.
map(() => CloseCause.Escape)
)
);
}
}
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