import { AfterContentChecked, AfterContentInit, ElementRef, EventEmitter, AfterViewInit, QueryList } from '@angular/core';
import { NavController } from '../../providers/nav-controller';
import { StackDidChangeEvent, StackWillChangeEvent } from './stack-utils';
import * as i0 from "@angular/core";
export declare abstract class IonTabs implements AfterViewInit, AfterContentInit, AfterContentChecked {
    private navCtrl;
    /**
     * Note: These must be redeclared on each child class since it needs
     * access to generated components such as IonRouterOutlet and IonTabBar.
     */
    abstract outlet: any;
    abstract tabBar: any;
    abstract tabBars: QueryList<any>;
    abstract tabs: QueryList<any>;
    tabsInner: ElementRef<HTMLDivElement>;
    /**
     * Emitted before the tab view is changed.
     */
    ionTabsWillChange: EventEmitter<{
        tab: string;
    }>;
    /**
     * Emitted after the tab view is changed.
     */
    ionTabsDidChange: EventEmitter<{
        tab: string;
    }>;
    private tabBarSlot;
    private hasTab;
    private selectedTab?;
    private leavingTab?;
    constructor(navCtrl: NavController);
    ngAfterViewInit(): void;
    ngAfterContentInit(): void;
    ngAfterContentChecked(): void;
    /**
     * @internal
     */
    onStackWillChange({ enteringView, tabSwitch }: StackWillChangeEvent): void;
    /**
     * @internal
     */
    onStackDidChange({ enteringView, tabSwitch }: StackDidChangeEvent): void;
    /**
     * When a tab button is clicked, there are several scenarios:
     * 1. If the selected tab is currently active (the tab button has been clicked
     *    again), then it should go to the root view for that tab.
     *
     *   a. Get the saved root view from the router outlet. If the saved root view
     *      matches the tabRootUrl, set the route view to this view including the
     *      navigation extras.
     *   b. If the saved root view from the router outlet does
     *      not match, navigate to the tabRootUrl. No navigation extras are
     *      included.
     *
     * 2. If the current tab tab is not currently selected, get the last route
     *    view from the router outlet.
     *
     *   a. If the last route view exists, navigate to that view including any
     *      navigation extras
     *   b. If the last route view doesn't exist, then navigate
     *      to the default tabRootUrl
     */
    select(tabOrEvent: string | CustomEvent): Promise<boolean> | undefined;
    private setActiveTab;
    private tabSwitch;
    getSelected(): string | undefined;
    /**
     * Detects changes to the slot attribute of the tab bar.
     *
     * If the slot attribute has changed, then the tab bar
     * should be relocated to the new slot position.
     */
    private detectSlotChanges;
    /**
     * Relocates the tab bar to the new slot position.
     */
    private relocateTabBar;
    static ɵfac: i0.ɵɵFactoryDeclaration<IonTabs, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<IonTabs, "ion-tabs", never, {}, { "ionTabsWillChange": "ionTabsWillChange"; "ionTabsDidChange": "ionTabsDidChange"; }, never, never, false, never>;
}