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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { CdkConnectedOverlay, CdkOverlayOrigin } from '@angular/cdk/overlay';
import {
booleanAttribute,
ChangeDetectionStrategy,
Component,
computed,
ElementRef,
input,
model,
signal,
viewChild,
viewChildren
} from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
import { isRTL } from '@siemens/element-ng/common';
import { addIcons, elementOk, SiIconComponent } from '@siemens/element-ng/icon';
import { SiTranslatePipe, TranslatableString } from '@siemens/element-translate-ng/translate';
/**
* The Element data color palette is used as default.
* Note: This array needs to be kept in sync with the design system data color tokens.
*/
const defaultDataColors: string[] = [
'element-data-1',
'element-data-2',
'element-data-3',
'element-data-4',
'element-data-5',
'element-data-6',
'element-data-7',
'element-data-8',
'element-data-9',
'element-data-10',
'element-data-11',
'element-data-12',
'element-data-13',
'element-data-14',
'element-data-15',
'element-data-16'
];
@Component({
selector: 'si-color-picker',
imports: [SiIconComponent, SiTranslatePipe, CdkConnectedOverlay, CdkOverlayOrigin],
templateUrl: './si-color-picker.component.html',
styleUrl: './si-color-picker.component.scss',
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: SiColorPickerComponent,
multi: true
}
],
changeDetection: ChangeDetectionStrategy.OnPush
})
export class SiColorPickerComponent implements ControlValueAccessor {
// eslint-disable-next-line defaultValue/tsdoc-defaultValue-annotation
/**
* The color palette to choose the colors from. As colors, only valid CSS
* variable names omitting the `--` prefix or Element color tokens omitting
* the `$` prefix are supported.
*
* Note: If custom CSS variables are provided, they need to be defined for
* both light and dark mode.
*
* @defaultValue The first 16 colors of the Element data color palette.
*/
readonly colorPalette = input<string[]>(defaultDataColors);
/**
* The selected color.
*/
readonly color = model<string>();
/**
* Specifies whether the color popup should automatically close on a color selection.
*
* @defaultValue false
*/
readonly autoClose = input(false, { transform: booleanAttribute });
/**
* Specifies whether the color picker component is disabled.
*
* @defaultValue false
*/
// eslint-disable-next-line @angular-eslint/no-input-rename
readonly disabledInput = input(false, { alias: 'disabled' });
/**
* Aria label for the color input button.
*/
readonly ariaLabel = input<TranslatableString>();
private onChange: (value: string) => void = () => {};
private onTouched: () => void = () => {};
private readonly colorInputRef =
viewChild.required<ElementRef<HTMLInputElement>>('colorInputBox');
private readonly swatchInputs = viewChildren<ElementRef<HTMLInputElement>>('swatchInput');
private readonly selectedSwatchInput = computed(() =>
this.swatchInputs().find(swatchInput => swatchInput.nativeElement.checked)
);
private readonly disabledNgControl = signal(false);
private readonly numberOfColumns = 4;
protected readonly disabled = computed(() => this.disabledInput() || this.disabledNgControl());
protected readonly isOverlayOpen = signal(false);
protected readonly icons = addIcons({ elementOk });
protected blur(): void {
if (!this.autoClose()) {
this.onTouched();
}
}
protected arrowDown(index: number, event: Event): void {
const nextIndex = index + this.numberOfColumns;
this.focusLabel(nextIndex);
event.preventDefault();
}
protected arrowUp(index: number, event: Event): void {
const prevIndex = index - this.numberOfColumns;
this.focusLabel(prevIndex);
event.preventDefault();
}
protected arrowLeft(index: number, event: Event): void {
const prevIndex = index + (isRTL() ? 1 : -1);
this.focusLabel(prevIndex);
event.preventDefault();
}
protected arrowRight(index: number, event: Event): void {
const prevIndex = index + (isRTL() ? -1 : +1);
this.focusLabel(prevIndex);
event.preventDefault();
}
private focusLabel(index: number): void {
const labels = this.swatchInputs();
const totalSwatches = labels.length;
const normalizedIndex = (index + totalSwatches) % totalSwatches;
labels[normalizedIndex].nativeElement.focus();
}
protected openOverlay(): void {
this.isOverlayOpen.set(true);
this.focusSelectedColor();
}
protected overlayDetach(): void {
this.isOverlayOpen.set(false);
setTimeout(() => {
this.colorInputRef().nativeElement?.focus();
});
}
private focusSelectedColor(): void {
setTimeout(() => {
this.selectedSwatchInput()?.nativeElement.focus();
});
}
protected selectColor(color: string): void {
this.color.set(color);
this.onChange(color!);
if (this.autoClose()) {
this.overlayDetach();
}
}
writeValue(value: string): void {
this.color.set(value);
}
registerOnChange(fn: (value: string) => void): void {
this.onChange = fn;
}
registerOnTouched(fn: () => void): void {
this.onTouched = fn;
}
setDisabledState(isDisabled: boolean): void {
this.disabledNgControl.set(isDisabled);
}
}
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