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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { NgClass, NgTemplateOutlet } from '@angular/common';
import {
booleanAttribute,
Component,
computed,
input,
model,
OnChanges,
output,
viewChildren
} from '@angular/core';
import { FormsModule } from '@angular/forms';
import { addIcons, elementPlus, SiIconComponent } from '@siemens/element-ng/icon';
import { SiNumberInputComponent } from '@siemens/element-ng/number-input';
import {
SelectOption,
SelectOptionLegacy,
SiSelectComponent,
SiSelectSimpleOptionsDirective,
SiSelectSingleValueDirective
} from '@siemens/element-ng/select';
import { SiTranslatePipe, t } from '@siemens/element-translate-ng/translate';
import { SiReadonlyThresholdOptionComponent } from './si-readonly-threshold-option.component';
/**
* One step in a list of thresholds
*/
export interface ThresholdStep {
/** Threshold value, the first step has no value */
value?: number;
/** One of the `SelectOption.id` */
optionValue: string;
/** When set to `false`, input fields are highlighted as invalid */
valid?: boolean;
}
@Component({
selector: 'si-threshold',
imports: [
FormsModule,
NgClass,
NgTemplateOutlet,
SiIconComponent,
SiNumberInputComponent,
SiSelectComponent,
SiSelectSingleValueDirective,
SiSelectSimpleOptionsDirective,
SiTranslatePipe,
SiReadonlyThresholdOptionComponent
],
templateUrl: './si-threshold.component.html',
styleUrl: './si-threshold.component.scss',
host: {
'[class.add-remove]': 'canAddRemoveSteps()',
'[class.horizontal]': 'horizontalLayout()',
'[class.dec-inc-buttons]': 'showDecIncButtons()'
}
})
export class SiThresholdComponent implements OnChanges {
/**
* Options to be shown in select dropdown
*
* @defaultValue []
*/
readonly options = input<SelectOptionLegacy[] | SelectOption<unknown>[]>([]);
/**
* The thresholds
*
* @defaultValue []
*/
readonly thresholdSteps = model<ThresholdStep[]>([]);
/**
* The unit to show
*
* @defaultValue ''
*/
readonly unit = input('');
/**
* The min. value for the threshold value
*
* @defaultValue 0
*/
readonly minValue = input(0);
/**
* The max. value for the threshold value
*
* @defaultValue 100
*/
readonly maxValue = input(100);
/**
* The step size for the threshold value
*
* @defaultValue 1
*/
readonly stepSize = input(1);
/**
* Max. number of steps, 0 for no hard limit
*
* @defaultValue 0
*/
readonly maxSteps = input(0);
/**
* Do validation?
*
* @defaultValue true
*/
readonly validation = input(true, { transform: booleanAttribute });
/**
* When disabled, steps cannot be added/removed
*
* @defaultValue true
*/
readonly canAddRemoveSteps = input(true, { transform: booleanAttribute });
/**
* Use horizontal layout?
*
* @defaultValue false
*/
readonly horizontalLayout = input(false, { transform: booleanAttribute });
/**
* Show dec/inc buttons?
*
* @defaultValue true
*/
readonly showDecIncButtons = input(true, { transform: booleanAttribute });
/**
* The obvious
*
* @defaultValue false
*/
readonly readonly = input(false, { transform: booleanAttribute });
/**
* Indicate that the threshold options are readonly and cannot be changed. This will also disable adding / removing steps.
*
* @defaultValue false
*/
readonly readonlyConditions = input(false, { transform: booleanAttribute });
/**
* The aria-label for delete button
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_THRESHOLD.DELETE:Delete step`)
* ```
*/
readonly deleteAriaLabel = input(t(() => $localize`:@@SI_THRESHOLD.DELETE:Delete step`));
/**
* The aria-label for add button
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_THRESHOLD.ADD:Add step`)
* ```
*/
readonly addAriaLabel = input(t(() => $localize`:@@SI_THRESHOLD.ADD:Add step`));
/**
* The aria-label for input field
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_THRESHOLD.INPUT_LABEL:Threshold value`)
* ```
*/
readonly inputAriaLabel = input(t(() => $localize`:@@SI_THRESHOLD.INPUT_LABEL:Threshold value`));
/**
* The aria-label for status selection
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_THRESHOLD.STATUS:Status`)
* ```
*/
readonly statusAriaLabel = input(t(() => $localize`:@@SI_THRESHOLD.STATUS:Status`));
/** Fired when validation status changes */
readonly validChange = output<boolean>();
protected readonly colors = computed(() => {
const colorMap = new Map<unknown, string>();
for (const opt of this.options()) {
if (opt.type === 'option') {
colorMap.set(opt.value, opt.iconColor ?? '');
} else if (!opt.type) {
colorMap.set(opt.id, opt.color ?? '');
}
}
return this.thresholdSteps().map(ths => colorMap.get(ths.optionValue) ?? '');
});
protected readonly icons = addIcons({ elementPlus });
private _valid = true;
/**
* Whether the current input value is valid or not.
*/
get valid(): boolean {
return this._valid;
}
private readonly numberInputs = viewChildren(SiNumberInputComponent);
ngOnChanges(): void {
this.validate();
}
protected deleteStep(index: number): void {
const updated = [...this.thresholdSteps()];
updated.splice(index, 1);
this.thresholdSteps.set(updated);
this.validate();
}
protected addStep(index: number): void {
const newStep: ThresholdStep = { ...this.thresholdSteps()[index], value: undefined };
const updated = [...this.thresholdSteps()];
updated.splice(index + 1, 0, newStep);
this.thresholdSteps.set(updated);
this.validate();
setTimeout(() => this.numberInputs()[index].inputElement().nativeElement.focus());
}
protected stepChange(): void {
this.thresholdSteps.set([...this.thresholdSteps()]);
this.validate();
}
private validate(): void {
const prevValid = this.valid;
this._valid = true;
for (let i = 1; i < this.thresholdSteps().length; i++) {
const step = this.thresholdSteps()[i];
Iif (this.validation()) {
const prev = this.thresholdSteps()[i - 1];
const next = this.thresholdSteps()[i + 1];
// valid: withing min/max, each step is lower than next step with step size between
step.valid =
step.value != null &&
step.value >= this.minValue() &&
step.value <= this.maxValue() &&
(prev.value == null || step.value - this.stepSize() >= prev.value) &&
(next?.value == null || step.value + this.stepSize() <= next.value);
this._valid &&= step.valid;
} else {
step.valid = true;
}
}
Iif (this.valid !== prevValid) {
this.validChange.emit(this.valid);
}
}
}
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