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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | 223x 223x 223x 223x 223x 223x 156x 156x 156x 156x 156x 156x 156x 312x 267x 267x 87x 180x 24x 267x 156x 31x 31x | import { ChangeDetectorRef, Directive, Input, TemplateRef, ViewContainerRef } from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { BehaviorSubject, combineLatest, of } from 'rxjs';
import { distinctUntilChanged, switchMap } from 'rxjs/operators';
import { FeatureToggleService, FeatureToggleType } from 'ish-core/feature-toggle.module';
/**
* Structural directive.
* Used on an element, this element will only be rendered if the specified feature *is enabled*.
*
* For the negated case see {@link NotFeatureToggleDirective}.
* For the corresponding pipe see {@link FeatureTogglePipe}.
*
* @example
* <div *ishFeature="'quoting'; else disabledTemplate">
* Only visible when quoting is enabled.
* </div>
* <ng-template #disabledTemplate>
* <div>Quoting is disabled.</div>
* </ng-template>
*/
@Directive({
selector: '[ishFeature]',
})
export class FeatureToggleDirective {
private otherTemplateRef: TemplateRef<unknown>;
private feature$ = new BehaviorSubject<'always' | 'never' | FeatureToggleType>(undefined);
private elseSet$ = new BehaviorSubject<boolean>(false);
constructor(
private templateRef: TemplateRef<unknown>,
private viewContainer: ViewContainerRef,
private featureToggle: FeatureToggleService,
private cdRef: ChangeDetectorRef
) {
combineLatest([
this.feature$.pipe(
switchMap(feature => (feature ? this.featureToggle.enabled$(feature) : of(false))),
distinctUntilChanged()
),
this.elseSet$,
])
.pipe(takeUntilDestroyed())
.subscribe(([enabled, elseSet]) => {
this.viewContainer.clear();
if (enabled) {
this.viewContainer.createEmbeddedView(this.templateRef);
} else if (elseSet && this.otherTemplateRef) {
this.viewContainer.createEmbeddedView(this.otherTemplateRef);
}
this.cdRef.markForCheck();
});
}
@Input() set ishFeature(feature: 'always' | 'never' | FeatureToggleType) {
this.feature$.next(feature);
}
@Input() set ishFeatureElse(otherTemplateRef: TemplateRef<unknown>) {
this.otherTemplateRef = otherTemplateRef;
this.elseSet$.next(true);
}
}
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