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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Directive,
Inject,
Injectable,
InjectionToken,
Optional,
Self,
SkipSelf,
} from '@angular/core';
/** Injection token which can be used to configure the `DynamicHeadingLevelService`. */
export const DYNAMIC_HEADING_START_LEVEL: InjectionToken<DynamicHeadingStartLevel> =
new InjectionToken('dynamicHeadingStartLevel');
export type DynamicHeadingStartLevel =
| DynamicHeadingStartLevelAbsolute
| DynamicHeadingStartLevelRelative;
/**
* Configuration which lets the dynamic headings start at an absolute / fixed level.
*/
export interface DynamicHeadingStartLevelAbsolute {
/** @ignore */
kind: 'absolute';
/** Level at which headings will start. */
start: number;
}
/**
* Configuration which lets the dynamic headings start with a custom offset from the
* next parent. Can be used to use level offsets different from the default value.
*/
export interface DynamicHeadingStartLevelRelative {
/** @ignore */
kind: 'relative';
/** Offset which will be added to the dynamically determined parent level. */
offset: number;
}
/**
* Controls the level of dynamic heading components which use the service. Can be also used as directive to
* increase the level of headings nested within the directive's target.
*
* By default, the current level is increased by one for all children.
*/
@Directive({
selector: '[data-gc-dynamic-heading-level]',
})
// eslint-disable-next-line @angular-eslint/directive-class-suffix -- also usable as directive, but primarly named as service to keep consistency with related injectables
export class DynamicHeadingLevelService {
/**
* The heading level at which contained headings should start.
*/
public readonly headingLevel: number;
constructor(
@Optional() @SkipSelf() parentLevel: DynamicHeadingLevelService | null,
@Inject(DYNAMIC_HEADING_START_LEVEL)
@Optional()
@Self()
startConfig: DynamicHeadingStartLevel | null,
) {
const start =
startConfig?.kind === 'absolute' ? startConfig.start : undefined;
const offset = startConfig?.kind === 'relative' ? startConfig.offset : 1;
if (start !== undefined && start < 1) {
throw new Error(
`start heading level must be at least 1, got ${start.toString()}`,
);
}
this.headingLevel = start ?? (parentLevel?.headingLevel ?? 1) + offset;
}
}
/**
* Alternative dynamic heading service implementation, which does not increase the level and
* reuses the level of the next parent.
*
* This may be used to avoid increasing the level of headings within a component's view, whilst
* increasing the level of (projected) children via the default service implementation.
*/
@Injectable()
export class DynamicHeadingLevelPassthroughService
implements DynamicHeadingLevelService
{
public get headingLevel(): number {
return this.parentLevel.headingLevel;
}
private readonly parentLevel: DynamicHeadingLevelService;
constructor(
@Optional() @SkipSelf() parentLevel: DynamicHeadingLevelService | null,
) {
this.parentLevel =
parentLevel ??
new DynamicHeadingLevelService(null, { kind: 'absolute', start: 1 });
}
}
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