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ComponentRef,
Directive,
ElementRef,
Input,
OnChanges,
OnDestroy,
Optional,
SimpleChange,
SimpleChanges,
ViewContainerRef,
} from '@angular/core';
import { createWidgetKeySet } from '../../utils/utilities';
import { ElementInsertionContextService } from '../element-insertion-context.service';
import { OverlayContainerComponent } from '../overlay-container/overlay-container.component';
import { ConnectType, TooltipComponent } from './tooltip.component';
const ARIA_DESCRIBEDBY = 'aria-describedby';
const ARIA_LABELLEDBY = 'aria-labelledby';
@Directive({
selector: '[data-gc-tooltip]',
standalone: false,
})
export class TooltipDirective implements OnDestroy, OnChanges {
@Input('data-gc-tooltip-connect-as')
public connectAs: ConnectType = ARIA_DESCRIBEDBY;
@Input('data-gc-tooltip-testid')
public set testId(value: string) {
(this.componentRef.location.nativeElement as HTMLElement).setAttribute(
'data-testid',
value,
);
}
@Input('data-gc-tooltip-offset')
public set offset(value: number) {
this.componentRef.setInput('offset', value);
}
@Input('data-gc-tooltip-orientation')
public set orientation(value: 'vertical' | 'horizontal') {
this.componentRef.setInput('orientation', value);
}
/**
* Set the text of the tooltip.
* Tooltip is not created if the text is empty.
*/
@Input({ alias: 'data-gc-tooltip', required: true })
public set text(value: string) {
this._text = value;
this.componentRef.setInput('text', value);
}
@Input('data-gc-tooltip-focus-anchor')
public set focusAnchor(
value: ElementRef<HTMLElement> | HTMLElement | undefined,
) {
this.componentRef.setInput('focusAnchor', value);
}
@Input('data-gc-tooltip-permit')
public set permitTooltip(value: () => boolean) {
this.componentRef.setInput('permitTooltip', value);
}
/** @ignore */
private readonly _widgetKeys = createWidgetKeySet('gc-tooltip');
/** @ignore */
private _text = '';
/** @ignore */
private readonly componentRef: ComponentRef<TooltipComponent>;
/** @ignore */
private readonly parentElement: HTMLElement;
constructor(
private readonly viewRef: ViewContainerRef,
@Optional() eic: ElementInsertionContextService | null,
@Optional() parent: OverlayContainerComponent | null,
) {
this.componentRef = this.viewRef.createComponent(TooltipComponent);
this.componentRef.setInput('tooltipId', this._widgetKeys.baseKey);
this.componentRef.setInput(
'tooltipOwner',
this.viewRef.element.nativeElement,
);
let zIndex = 1000;
if (parent) {
zIndex = parent.zIndex + 900;
}
this.componentRef.setInput('zIndex', zIndex);
this.parentElement = eic?.parent ?? document.body;
}
/** @ignore */
ngOnChanges(changes: SimpleChanges): void {
if ('text' in changes) {
const change = changes.text;
const componentAttached =
change.firstChange || change.previousValue !== '';
if (change.currentValue === '' && componentAttached) {
const componentIndex = this.viewRef.indexOf(this.componentRef.hostView);
this.viewRef.detach(componentIndex);
} else if (change.currentValue && !componentAttached) {
this.viewRef.insert(this.componentRef.hostView);
this.parentElement.appendChild(
this.componentRef.location.nativeElement,
);
} else if (change.firstChange) {
this.parentElement.appendChild(
this.componentRef.location.nativeElement,
);
}
}
if ('connectAs' in changes || 'text' in changes) {
this.updateAriaAttributes(changes.connectAs, changes.text);
}
}
/** @ignore */
ngOnDestroy(): void {
this.componentRef.destroy();
}
/** @ignore */
private determineAriaAttributeValue(
attribute: Exclude<ConnectType, 'none'>,
connectAs: ConnectType,
text: string,
): string | undefined {
return connectAs === attribute && text !== ''
? this.componentRef.instance.tooltipContentId
: undefined;
}
/** @ignore */
private updateAriaAttributes(
connectAs: SimpleChange | undefined,
text: SimpleChange | undefined,
) {
const tooltipOwner = this.viewRef.element;
if (!(tooltipOwner.nativeElement instanceof Element)) {
console.error('Tooltip owner element is not defined.');
return;
}
const tooltipOwnerElement = tooltipOwner.nativeElement;
this.updateAriaAttribute(
tooltipOwnerElement,
ARIA_DESCRIBEDBY,
connectAs,
text,
);
this.updateAriaAttribute(
tooltipOwnerElement,
ARIA_LABELLEDBY,
connectAs,
text,
);
}
/** @ignore */
private updateAriaAttribute(
element: Element,
attribute: typeof ARIA_DESCRIBEDBY | typeof ARIA_LABELLEDBY,
connectAsChange: SimpleChange | undefined,
textChange: SimpleChange | undefined,
) {
type ConnectAsPropType = typeof this.connectAs;
type TextPropType = typeof this.text;
let expectedPreviousValue: string | undefined = undefined;
if (
connectAsChange?.firstChange !== true &&
textChange?.firstChange !== true
) {
expectedPreviousValue = this.determineAriaAttributeValue(
attribute,
connectAsChange !== undefined
? (connectAsChange.previousValue as ConnectAsPropType)
: this.connectAs,
textChange !== undefined
? (textChange.previousValue as TextPropType)
: this._text,
);
}
const newValue = this.determineAriaAttributeValue(
attribute,
connectAsChange !== undefined
? (connectAsChange.currentValue as ConnectAsPropType)
: this.connectAs,
textChange !== undefined
? (textChange.currentValue as TextPropType)
: this._text,
);
if (expectedPreviousValue !== newValue) {
const presentValue = element.getAttribute(attribute) ?? undefined;
if (presentValue !== expectedPreviousValue) {
console.error(
`The value of the '${attribute}' attribute was modified externally / outside of the tooltip.`,
`Expected: "${expectedPreviousValue ?? '<not present>'}"`,
`Found: "${presentValue ?? '<not present>'}"`,
);
throw new Error('unexpected modification of tooltip aria attributes');
}
if (newValue) {
element.setAttribute(attribute, newValue);
} else {
element.removeAttribute(attribute);
}
}
}
}
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