import { EventEmitter } from '@angular/core';
import { NavigationMode } from './navigation-mode.interface';
import { WizardComponent } from '../components/wizard.component';
/**
 * Base implementation of [[NavigationMode]]
 *
 * Note: Built-in [[NavigationMode]] classes should be stateless, allowing the library user to easily create
 * an instance of a particular [[NavigationMode]] class and pass it to `<aw-wizard [navigationMode]="...">`.
 *
 * @author Marc Arndt
 */
export declare abstract class BaseNavigationMode implements NavigationMode {
    /**
     * Checks, whether a wizard step, as defined by the given destination index, can be transitioned to.
     *
     * This method controls navigation by [[goToStep]], [[goToPreviousStep]], and [[goToNextStep]] directives.
     * Navigation by navigation bar is governed by [[isNavigable]].
     *
     * In this implementation, a destination wizard step can be entered if:
     * - it exists
     * - the current step can be exited in the direction of the destination step
     * - the destination step can be entered in the direction from the current step
     *
     * Subclasses can impose additional restrictions, see [[canTransitionToStep]].
     *
     * @param wizard The wizard component to operate on
     * @param destinationIndex The index of the destination step
     * @returns A [[Promise]] containing `true`, if the destination step can be transitioned to and `false` otherwise
     */
    canGoToStep(wizard: WizardComponent, destinationIndex: number): Promise<boolean>;
    /**
     * Imposes additional restrictions for `canGoToStep` in current navigation mode.
     *
     * The base implementation allows transition iff the given step is navigable from the navigation bar (see `isNavigable`).
     * However, in some navigation modes `canTransitionToStep` can be more relaxed to allow navigation to certain steps
     * by previous/next buttons, but not using the navigation bar.
     *
     * @param wizard The wizard component to operate on
     * @param destinationIndex The index of the destination step
     * @returns `true`, if the destination step can be transitioned to and `false` otherwise
     */
    protected canTransitionToStep(wizard: WizardComponent, destinationIndex: number): boolean;
    /**
     * Tries to transition to the wizard step, as denoted by the given destination index.
     *
     * When entering the destination step, the following actions are done:
     * - the old current step is set as completed
     * - the old current step is set as unselected
     * - the old current step is exited
     * - the destination step is set as selected
     * - the destination step is entered
     *
     * When the destination step couldn't be entered, the following actions are done:
     * - the current step is exited and entered in the direction `MovingDirection.Stay`
     *
     * @param wizard The wizard component to operate on
     * @param destinationIndex The index of the destination wizard step, which should be entered
     * @param preFinalize An event emitter, to be called before the step has been transitioned
     * @param postFinalize An event emitter, to be called after the step has been transitioned
     */
    goToStep(wizard: WizardComponent, destinationIndex: number, preFinalize?: EventEmitter<void>, postFinalize?: EventEmitter<void>): void;
    /**
     * Transitions the wizard to the given step index.
     *
     * Can perform additional actions in particular navigation mode implementations.
     *
     * @param wizard The wizard component to operate on
     * @param destinationIndex The index of the destination wizard step
     */
    protected transition(wizard: WizardComponent, destinationIndex: number): void;
    /**
     * @inheritDoc
     */
    abstract isNavigable(WizardComponent: WizardComponent, destinationIndex: number): boolean;
    /**
     * Resets the state of this wizard.
     *
     * A reset transitions the wizard automatically to the first step and sets all steps as incomplete.
     * In addition the whole wizard is set as incomplete.
     *
     * @param wizard The wizard component to operate on
     */
    reset(wizard: WizardComponent): void;
    /**
     * Checks if wizard configuration allows to perform reset.
     *
     * A check failure is indicated by throwing an `Error` with the message discribing the discovered misconfiguration issue.
     *
     * Can include additional checks in particular navigation mode implementations.
     *
     * @param wizard The wizard component to operate on
     * @throws An `Error` is thrown, if a micconfiguration issue is discovered.
     */
    protected ensureCanReset(wizard: WizardComponent): void;
}