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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { NgClass } from '@angular/common';
import {
ChangeDetectionStrategy,
Component,
computed,
ElementRef,
forwardRef,
input,
model,
OnChanges,
OnDestroy,
OnInit,
output,
signal,
SimpleChanges,
viewChild
} from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
import { isRTL, listenGlobal } from '@siemens/element-ng/common';
import { SiIconComponent } from '@siemens/element-ng/icon';
import { SiTranslatePipe } from '@siemens/element-translate-ng/translate';
import { StatusToggleItem } from './status-toggle.model';
@Component({
selector: 'si-status-toggle',
imports: [NgClass, SiIconComponent, SiTranslatePipe],
templateUrl: './si-status-toggle.component.html',
styleUrl: './si-status-toggle.component.scss',
providers: [
{
provide: NG_VALUE_ACCESSOR,
// eslint-disable-next-line @angular-eslint/no-forward-ref
useExisting: forwardRef(() => SiStatusToggleComponent),
multi: true
}
],
changeDetection: ChangeDetectionStrategy.OnPush
})
export class SiStatusToggleComponent implements ControlValueAccessor, OnInit, OnDestroy, OnChanges {
/** List of status items. */
readonly items = input.required<StatusToggleItem[]>();
/**
* Disabled state for the whole component.
* @defaultValue false
**/
readonly disabled = input(false);
/** Value of currently selected status item. */
readonly value = model<string | number>();
/** Emitted when an item is clicked. */
readonly itemClick = output<string | number>();
private readonly containerElement = viewChild.required<ElementRef>('container');
private readonly draggableElement = viewChild.required<ElementRef>('draggable');
private boundingX = 0;
private x0 = 0;
private offset0 = 0;
private onChange?: (value: string | number) => void;
private onTouched?: () => void;
private unlistenDragEvents: (() => void)[] = [];
private readonly internalDisabled = signal(false);
protected readonly selectedIndex = signal<number | undefined>(undefined);
protected readonly draggablePosition = signal('');
protected readonly animated = signal(false);
protected readonly isDisabled = computed(() => this.disabled() || this.internalDisabled());
ngOnChanges(changes: SimpleChanges): void {
if (changes.value || changes.values) {
this.setValue(this.value(), true, false);
}
}
ngOnInit(): void {
const selectedIndex = this.items().findIndex(v => v.value === this.value());
if (selectedIndex >= 0) {
this.selectItem(selectedIndex, false, false);
}
}
ngOnDestroy(): void {
this.handleDragEnd();
}
/** @internal */
writeValue(value: string | number): void {
this.setValue(value, true, false);
}
/** @internal */
registerOnChange(fn: (value: string | number) => void): void {
this.onChange = fn;
}
/** @internal */
registerOnTouched(fn: () => void): void {
this.onTouched = fn;
}
/** @internal */
setDisabledState(isDisabled: boolean): void {
this.internalDisabled.set(isDisabled);
}
protected handleMouseDown(event: MouseEvent): void {
Iif (this.isDisabled() || event.buttons !== 1) {
return;
}
if (this.handleDragStart(event)) {
this.unlistenDragEvents.push(listenGlobal('mousemove', e => this.handleDragMove(e)));
this.unlistenDragEvents.push(listenGlobal('mouseup', e => this.handleDragEnd(e)));
}
}
protected handleTouchStart(event: TouchEvent): void {
Iif (event.touches.length !== 1 || this.disabled()) {
return;
}
Iif (this.handleDragStart(event)) {
this.unlistenDragEvents.push(listenGlobal('touchmove', e => this.handleDragMove(e), true));
this.unlistenDragEvents.push(listenGlobal('touchend', e => this.handleDragEnd(e)));
}
}
private handleDragStart(event: Event): boolean {
const rect = this.containerElement().nativeElement.getBoundingClientRect();
this.boundingX = rect.x;
const draggable = this.draggableElement().nativeElement;
this.offset0 = draggable.offsetLeft;
this.x0 = this.getX(event);
// adjust for click outside current selection
const clickIndex = this.getUnderlyingIndex(this.x0, true);
const currentIndex = this.getUnderlyingIndex(this.offset0);
const factor = isRTL() ? -1 : 1;
this.offset0 += (clickIndex - currentIndex) * draggable.offsetWidth * factor;
this.handleDragMove(event);
return true;
}
private handleDragEnd(event?: Event): void {
this.arrangeToUnderlyingItem(event);
this.unlistenDragEvents.forEach(handler => handler());
this.unlistenDragEvents.length = 0;
}
private getOffset(event: Event, isStart = false): number {
const containerWidth = this.containerElement().nativeElement.clientWidth;
const draggableWidth = this.draggableElement().nativeElement.clientWidth;
const dX = this.getX(event) - this.x0;
const left = Math.min(Math.max(0, this.offset0 + dX), containerWidth - draggableWidth);
return isStart && isRTL() ? containerWidth - draggableWidth - left : left;
}
private getUnderlyingIndex(offsetLeft: number, floor = false): number {
const pos = offsetLeft / this.draggableElement().nativeElement.clientWidth;
const element = floor ? Math.floor(pos) : Math.round(pos);
const len = this.items().length;
const index = isRTL() ? len - element - 1 : element;
return Math.max(0, Math.min(len - 1, index));
}
private arrangeToUnderlyingItem(event?: Event): void {
if (event && !this.isDisabled()) {
const index = this.getUnderlyingIndex(this.getOffset(event));
this.selectItem(this.items()[index].disabled ? this.selectedIndex() : index);
this.onTouched?.();
}
}
private handleDragMove(event: Event): void {
if (event.cancelable) {
event.preventDefault();
event.stopPropagation();
}
this.draggablePosition.set(`${this.getOffset(event, true)}px`);
this.animated.set(false);
}
private getX(event: Event): number {
const clientX =
(event as MouseEvent).clientX ?? (event as TouchEvent).changedTouches[0]?.clientX ?? '';
return clientX - this.boundingX;
}
private setValue(val?: string | number, animated = true, emit = false): void {
this.selectItem(
this.items().findIndex(v => v.value === val),
animated,
emit
);
}
protected selectItem(index: number | undefined, animated = true, emit = true): void {
if (index === undefined || index === -1 || this.isDisabled()) {
return;
}
const values = this.items();
const value = values[index];
if (!value.disabled) {
const prevIndex = this.selectedIndex();
this.value.set(value.value);
this.animated.set(animated);
this.selectedIndex.set(index);
this.draggablePosition.set(`${(100 / values.length) * index}%`);
if (emit && index !== prevIndex) {
if (this.onChange) {
this.onChange(this.value()!);
}
}
if (emit) {
this.itemClick.emit(this.value()!);
}
}
}
}
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