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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
ElementRef,
NgZone,
OnInit,
computed,
contentChild,
inject,
input,
model,
viewChild,
} from '@angular/core';
import { FocusableElementOwner } from '../utils/util.types';
import { createWidgetKeySet } from '../utils/utilities';
import { TextInputComponent } from '../text-input-field/text-input-field.component';
/**
* A Checkbox element that allows the user to mark a value as selected.
*/
@Component({
selector: 'gc-checkbox',
templateUrl: './checkbox.component.html',
styleUrls: ['./checkbox.component.css'],
standalone: false,
})
export class CheckboxComponent implements FocusableElementOwner, OnInit {
/**
* Custom ID to use
*/
public readonly id = input<string>();
/**
* Hides the label of the checkbox. May be used for embedded rendering like in tables.
*/
public readonly hideLabel = input(false);
/**
* @ignore
*/
public readonly _inputElement =
viewChild<ElementRef<HTMLInputElement>>('input');
/**
* Text that will show near the checkbox
*/
public readonly label = input('');
/**
* Decides if the checkbox will be rendered in a disabled/enabled state
*/
public readonly disabled = input(false);
/**
* Decides if the checkbox will be rendered in a readonly state
*/
public readonly readonly = input(false);
/**
* An error message that shows under a checkbox
*/
public readonly errorMessage = input('');
/**
* Hint message that appears under a checkbox
*/
public readonly hint = input('');
/**
* @ignore
* Forces the checkbox to use error styling (independent of the error message)
*/
public readonly _useErrorStyle = input(false);
/**
* Marks the input field as required.
*/
public readonly required = input(false);
/**
* Enables setting of the value only when the Promise resolves with value "true".
*/
public permitValueChange =
input<(v: boolean) => Promise<boolean> | boolean>();
/**
* Current checkbox state.
*/
public readonly value = model<boolean>(false);
/** @ignore */
protected readonly readonlyTextInput =
contentChild<TextInputComponent>('readonlyTextInput');
/**
* @ignore
*/
protected readonly _widgetKeys = createWidgetKeySet('gc-checkbox');
/**
* @ignore
*/
protected readonly _hintId = this._widgetKeys.baseKey + '-hint';
/** @ignore */
protected readonly ariaDescribedBy = computed(() => {
const errId =
this.errorMessage().length > 0 ? this._widgetKeys.errorKey : null;
const hintId = this.hint().length > 0 ? this._hintId : null;
if (errId != null && hintId != null) {
return hintId + ' ' + errId;
} else if (errId) {
return errId;
} else if (hintId) {
return hintId;
} else {
return null;
}
});
private readonly zone = inject(NgZone);
public focusChild(): boolean {
if (this.disabled()) {
return false;
}
const isCheckBoxReadonly = this.readonly();
const readOnlyTextInput = this.readonlyTextInput();
const inputElement = this._inputElement();
if (isCheckBoxReadonly && readOnlyTextInput) {
return readOnlyTextInput.focusChild();
} else if (inputElement) {
inputElement.nativeElement.focus();
return true;
} else {
return false;
}
}
/** @ignore */
public ngOnInit(): void {
// browser may "restore" previous values after navigating (e.g. with browser's "back" button),
// potentially leading to an inconsistent state as no events are fired which could be used to
// detect this (observed on Chromium) -> sync back state to the native element after it's rendered
this.zone.runOutsideAngular(() => {
setTimeout(() => {
setTimeout(() => {
const inputElement = this._inputElement();
if (
!this.readonly() &&
inputElement &&
this.value() !== inputElement.nativeElement.checked
) {
inputElement.nativeElement.checked = this.value();
}
});
});
});
}
/** @ignore */
protected async handleClick(): Promise<void> {
const doChange = () => {
this.value.set(!this.value());
const inputElement = this._inputElement();
if (inputElement) {
inputElement.nativeElement.focus();
} else {
console.error('native input element not present'); // only expected to be missing in readonly state, otherwise should be always present
}
};
const inputElement = this._inputElement();
const permitValueChange = this.permitValueChange();
if (permitValueChange) {
const permit = await permitValueChange(!this.value());
if (permit) {
doChange();
} else if (inputElement) {
inputElement.nativeElement.checked = this.value();
}
} else {
doChange();
}
}
}
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