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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
Component,
ElementRef,
EventEmitter,
Input,
NgZone,
OnDestroy,
Output,
ViewChild,
} from '@angular/core';
import {
observeSize,
playSoundIfLengthExceeded,
subscribeDocument,
} from '../utils/internal-utils';
import {
Callback,
FocusableElementOwner,
FormControlStatus,
} from '../utils/util.types';
import { SoundType, playSound } from '../utils/utilities';
import { FocusScopeDirective } from '../internal/focus-scope.directive';
/**
* A Text Area Input element that allows users to enter a multiple lines of text value.
*/
@Component({
selector: 'gc-text-area',
templateUrl: './text-area.component.html',
styleUrls: ['./text-area.component.css'],
})
export class TextAreaComponent
implements AfterViewInit, OnDestroy, FocusableElementOwner
{
/**
* Custom ID to use.
*/
@Input()
public id?: string;
/**
* The label that shows on the text area input.
*/
@Input()
public label = '';
/**
* Decides if the control will be rendered in a readonly state.
*/
@Input()
public readonly = false;
/**
* If set to true the state of the input is set to disabled which means that it is no longer possible to type text inside the text area input.
*/
@Input()
public disabled = false;
/**
* Marks the text area input field as required.
*/
@Input()
public required = false;
/**
* Hint message that appears below the text area input field.
*/
@Input()
public hint = '';
/**
* Placeholder text that appears inside of the text area field.
*/
@Input()
public placeholder = '';
/**
* Max number of chars allowed inside that text area input field.
*/
@Input()
public maxLength?: number;
/**
* Inform about the change of the value.
*/
@Output()
readonly valueChange: EventEmitter<string> = new EventEmitter<string>();
/**
* Signals changes of the current status of the component, e.g. also reports errors triggered by input handling.
*/
@Output()
public readonly onStatusChange: EventEmitter<FormControlStatus> =
new EventEmitter<FormControlStatus>(true);
/**
* @ignore
*/
@ViewChild(FocusScopeDirective)
public focusScope?: FocusScopeDirective;
/**
* @ignore
*/
@ViewChild('mirrorNode')
public mirrorNode!: ElementRef<HTMLParagraphElement>;
/**
* @ignore
*/
@ViewChild('textarea')
public textareaElement!: ElementRef<HTMLInputElement>;
/**
* Event fired when the control looses focus
*/
@Output()
public readonly onFocusLeft: EventEmitter<void> = new EventEmitter<void>();
/**
* The value of the text area.
*/
@Input()
get value(): string {
return this._value;
}
set value(text: string) {
this._value = text;
this.updateMirrorValue(text);
}
/**
* Error message that appears below the text area input field.
*/
@Input()
public set errorMessage(message: string) {
if (this._errorMessage !== message) {
this._errorMessage = message;
this.emitStatusChange();
}
}
public get errorMessage(): string {
return this._errorMessage;
}
/**
* @ignore
*/
_value = '';
/**
* @ignore
*/
_focused = false;
/**
* @ignore
*/
_mirrorValue = '';
/** @ignore */
private _errorMessage = '';
/** @ignore */
private eventListenerCleanup: Callback[] = [];
/**
* @ignore
*/
private lastPressedKey?: string;
constructor(private zone: NgZone) {}
/**
* @ignore
*/
ngAfterViewInit(): void {
this.updateMirrorNodeWidth();
this.eventListenerCleanup.push(
observeSize(
this.mirrorNode,
this.zone,
this.onMirrorNodeResizeCallback.bind(this),
),
observeSize(
this.textareaElement,
this.zone,
this.onTextAreaResizeCallback.bind(this),
),
);
this.initializeClickListener();
this.initializeKeyDownListener();
}
/**
* @ignore
*/
ngOnDestroy(): void {
this.eventListenerCleanup.forEach(cleanup => cleanup());
}
focusChild(): boolean {
if (!this.disabled) {
this.textareaElement.nativeElement.focus();
return true;
} else {
return false;
}
}
/**
* @ignore
*/
_length(): number {
if (this._mirrorValue) {
return this._mirrorValue.length;
} else {
return 0;
}
}
/**
* @ignore
*/
public _onChange(event: Event): void {
this.value = (event.target as HTMLTextAreaElement).value;
this.valueChange.emit(this.value);
}
/** @ignore */
public _onInput(event: Event): void {
this.updateMirrorValue((event.target as HTMLTextAreaElement).value);
}
/** @ignore */
public updateMirrorValue(text: string) {
// if there's a line end on the text text-area already shows
// the newline but the mirror node not, adding an extra character
// makes the mirror node take this empty line into account
this._mirrorValue = text.endsWith('\n') ? text + 'n' : text;
}
/**
* @ignore
*/
public _setFocus(focused: boolean): void {
this._focused = focused;
if (this.lastPressedKey === 'Tab' && focused) {
this.textareaElement.nativeElement.select();
}
}
/**
* @ignore
*/
public isFocusWithin(): boolean {
if (this.focusScope !== undefined) {
return this.focusScope.focusWithin;
}
return false;
}
/**
* @ignore
*/
public maxLengthAriaText(): string | null {
if (this.maxLength !== undefined && this.maxLength !== 0) {
return 'maximal ' + this.maxLength.toString() + ' Zeichen';
}
return null;
}
/**
* @ignore
*/
public _handleFocusLeave(): void {
this.onFocusLeft.next();
// We need to wait a tick so that the control is back
// in a sync state
setTimeout(() => {
if (this.errorMessage.length > 0) {
void playSound(SoundType.ERROR);
}
});
}
/**
* @ignore
*/
public _handleBeforeInput(evt: InputEvent): void {
playSoundIfLengthExceeded(
this.textareaElement.nativeElement,
this._mirrorValue,
this.maxLength,
evt,
);
}
/**
* @ignore
*/
private recomputeHeight(): void {
this.textareaElement.nativeElement.style.height =
(this.mirrorNode.nativeElement.clientHeight - 32).toString() + 'px'; // 32 = 20 + 12 see css
}
/**
* @ignore
*/
private initializeKeyDownListener(): void {
this.eventListenerCleanup.push(
subscribeDocument(
'keydown',
(ev: KeyboardEvent) => (this.lastPressedKey = ev.key),
),
);
}
/**
* @ignore
*/
private onMirrorNodeResizeCallback(): void {
this.recomputeHeight();
}
/**
* @ignore
*/
private onTextAreaResizeCallback(): void {
this.updateMirrorNodeWidth();
}
/**
* @ignore
*/
private initializeClickListener(): void {
this.eventListenerCleanup.push(
subscribeDocument('mousedown', () => (this.lastPressedKey = 'click')),
);
}
/**
* @ignore
*/
private updateMirrorNodeWidth(): void {
this.mirrorNode.nativeElement.style.width =
(
this.textareaElement.nativeElement.getBoundingClientRect().width - 24
).toString() + 'px'; // padding-left: 12px, padding-right: 12px
}
/** @ignore */
private emitStatusChange() {
const status: FormControlStatus = {};
if (this.errorMessage) {
status.error = [this.errorMessage];
}
this.onStatusChange.emit(status);
}
}
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