import { Disposable, Service } from './metadata';
import { Observable } from 'rxjs';
import { ActivityAction, ActivityProperties } from '@scion/workbench-application-platform.api';
/**
 * Allows interaction with workbench activities.
 *
 * Activities are top-level navigation elements to open activity panels or views.
 * They are placed in the activity bar on the far left-hand side.
 */
export declare class ActivityService implements Service {
    private _destroy$;
    private _active$;
    private _disposables;
    constructor();
    private onHostMessage;
    /**
     * Sets properties of the activity which is currently showing this application.
     */
    setProperties(properties: ActivityProperties): void;
    /**
     * Gets properties of the activity which is currently showing this application.
     */
    getProperties(): Promise<ActivityProperties>;
    /**
     * Associates an action with the activity showing this application.
     * The action is displayed in the upper right corner of the activity panel header.
     *
     * Returns {Disposable} to remove the action.
     */
    addAction(action: ActivityAction): Disposable;
    /**
     * Indicates whether this activity is the active activity.
     * Emits the current state upon subscription.
     */
    get active$(): Observable<boolean>;
    private handleActiveChange;
    onDestroy(): void;
}