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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
ChangeDetectionStrategy,
Component,
ElementRef,
NgZone,
OnDestroy,
} from '@angular/core';
export type AriaLiveReadDisposer = (finalText?: string) => void;
@Component({
selector: 'gc-aria-live-reader',
template: '',
styleUrls: ['./aria-live-reader.component.css'],
host: {
class: 'gc-scr-only',
// 'aria-atomic': 'true', causes problems on firefox see #2226
'aria-live': 'polite',
},
changeDetection: ChangeDetectionStrategy.Default,
standalone: false,
})
export class AriaLiveReaderComponent implements OnDestroy {
private timerId: ReturnType<typeof setTimeout> | undefined;
private repeatTimerId: ReturnType<typeof setInterval> | undefined;
constructor(
private readonly zone: NgZone,
private readonly elementRef: ElementRef<HTMLElement>,
) {}
public readText(
text: string,
initialDelay = 0,
interval = 0,
): AriaLiveReadDisposer {
if (interval !== 0 && interval < 500) {
interval = 500;
console.log(
'Interval has be at least 500ms so that a11y tools have a chance to announce',
);
}
this.zone.runOutsideAngular(() => {
clearTimeout(this.timerId);
clearInterval(this.repeatTimerId);
this.timerId = setTimeout(() => {
this.updateText(text, interval);
if (interval > 0) {
this.repeatTimerId = this.repeatTimerId = setInterval(() => {
this.updateText(text, interval);
}, interval);
}
}, initialDelay);
});
return (finalText?: string) => {
this.zone.runOutsideAngular(() => {
clearTimeout(this.timerId);
clearInterval(this.repeatTimerId);
if (finalText) {
this.updateText(finalText, interval);
}
});
};
}
/** @ignore */
ngOnDestroy(): void {
this.zone.runOutsideAngular(() => {
clearTimeout(this.timerId);
clearInterval(this.repeatTimerId);
});
}
private updateText(text: string, interval: number) {
this.elementRef.nativeElement.innerText = text;
setTimeout(
() => (this.elementRef.nativeElement.innerText = ''),
Math.min(1000, Math.max(interval - 100, 400)), // the min repeat is 500 make sure we cleared before
);
}
}
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