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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
ElementRef,
EventEmitter,
Input,
NgZone,
OnInit,
Output,
ViewChild,
} from '@angular/core';
import { FocusableElementOwner, WidgetKeySet } 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
*/
@Input()
public id?: string;
/**
* Hides the label of the checkbox. May be used for embedded rendering like in tables.
*/
@Input()
public hideLabel = false;
/**
* @ignore
*/
@ViewChild('input')
public _inputElement?: ElementRef<HTMLInputElement>;
/**
* Text that will show near the checkbox
*/
@Input()
public label = '';
/**
* Decides if the checkbox will be rendered in a disabled/enabled state
*/
@Input()
public disabled = false;
/**
* Decides if the checkbox will be rendered in a readonly state
*/
@Input()
public readonly = false;
/**
* An error message that shows under a checkbox
*/
@Input()
public errorMessage = '';
/**
* Hint message that appears under a checkbox
*/
@Input()
public hint = '';
/**
* @ignore
* Forces the checkbox to use error styling (independent of the error message)
*/
@Input()
public _useErrorStyle = false;
/**
* Marks the input field as required.
*/
@Input()
public required = false;
/**
* Enables setting of the value only when the Promise resolves with value "true".
*/
@Input()
public permitValueChange?: (v: boolean) => Promise<boolean> | boolean;
/**
* Inform about the change of the selection state
*/
@Output()
public readonly valueChange: EventEmitter<boolean> =
new EventEmitter<boolean>();
/** @ignore */
@ViewChild('readonlyTextInput')
protected readonlyTextInput?: TextInputComponent;
@Input()
public get value(): boolean {
return this._value;
}
public set value(value: boolean) {
this._value = value;
}
/**
* @ignore
*/
public _hasFocus = false;
/**
* @ignore
*/
protected readonly _widgetKeys: WidgetKeySet =
createWidgetKeySet('gc-checkbox');
/**
* @ignore
*/
protected readonly _hintId = this._widgetKeys.baseKey + '-hint';
/**
* @ignore
*/
private _value = false;
public constructor(private readonly zone: NgZone) {}
public focusChild(): boolean {
if (!this.disabled) {
if (this.readonly && this.readonlyTextInput) {
return this.readonlyTextInput.focusChild();
} else if (this._inputElement) {
this._inputElement.nativeElement.focus();
return true;
} else {
return false;
}
} else {
return false;
}
}
/** @ignore */
public async _handleClick(): Promise<void> {
const doChange = () => {
this.value = !this.value;
if (this._inputElement) {
this._inputElement.nativeElement.focus();
this.valueChange.emit(this.value);
} else {
console.error('native input element not present'); // only expected to be missing in readonly state, otherwise should be always present
}
};
if (this.permitValueChange) {
const permit = await this.permitValueChange(!this.value);
if (permit) {
doChange();
} else if (this._inputElement) {
this._inputElement.nativeElement.checked = this.value;
}
} else {
doChange();
}
}
/**
* @ignore
*/
public _setFocus(focused: boolean) {
this._hasFocus = focused;
}
/** @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(() => {
if (
!this.readonly &&
this._inputElement &&
this.value !== this._inputElement.nativeElement.checked
) {
this._inputElement.nativeElement.checked = this.value;
}
});
});
});
}
/** @ignore */
protected computeAriaDescribedBy(): string | null {
const errId =
this.errorMessage.length > 0 ? this._widgetKeys.errorKey : null;
const hintId = this.hint.length > 0 ? this._hintId : null;
if (errId && hintId) {
return hintId + ' ' + errId;
} else if (errId) {
return errId;
} else if (hintId) {
return hintId;
} else {
return null;
}
}
}
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