import { EventEmitter } from '@angular/core';
import { WizardComponent } from '../components/wizard.component';
/**
 * An interface containing the basic functionality, which must be provided by a navigation mode.
 * A navigation mode manages the navigation between different wizard steps, this contains the validation, if a step transition can be done
 *
 * For base implementation see [[BaseNavigationMode]].
 *
 * @author Marc Arndt
 */
export interface 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]].
     *
     * @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>;
    /**
     * Tries to transition to the wizard step, as denoted by the given destination index.
     *
     * Note: You do not have to call [[canGoToStep]] before calling [[goToStep]].
     * The [[canGoToStep]] method will be called automatically.
     *
     * @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;
    /**
     * Checks, whether the wizard step, located at the given index, can be navigated to using the navigation bar.
     *
     * @param wizard The wizard component to operate on
     * @param destinationIndex The index of the destination step
     * @returns True if the step can be navigated to, false otherwise
     */
    isNavigable(wizard: WizardComponent, destinationIndex: number): boolean;
    /**
     * Resets the state of this wizard.
     *
     * @param wizard The wizard component to operate on
     */
    reset(wizard: WizardComponent): void;
}