import { NgZone, QueryList } from '@angular/core';
import { MdTabLabel } from './tab-label';
import { MdTabContent } from './tab-content';
import { MdTabLabelWrapper } from './tab-label-wrapper';
import { MdInkBar } from './ink-bar';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
/** A simple change event emitted on focus or selection changes. */
export declare class MdTabChangeEvent {
    index: number;
    tab: MdTab;
}
export declare class MdTab {
    label: MdTabLabel;
    content: MdTabContent;
}
/**
 * Material design tab-group component.  Supports basic tab pairs (label + content) and includes
 * animated ink-bar, keyboard navigation, and screen reader.
 * See: https://www.google.com/design/spec/components/tabs.html
 */
export declare class MdTabGroup {
    private _zone;
    _tabs: QueryList<MdTab>;
    _labelWrappers: QueryList<MdTabLabelWrapper>;
    _inkBar: QueryList<MdInkBar>;
    private _isInitialized;
    private _selectedIndex;
    selectedIndex: number;
    /** Output to enable support for two-way binding on `selectedIndex`. */
    private _selectedIndexChange;
    private _onFocusChange;
    focusChange: Observable<MdTabChangeEvent>;
    private _onSelectChange;
    selectChange: Observable<MdTabChangeEvent>;
    private _focusIndex;
    private _groupId;
    constructor(_zone: NgZone);
    /**
     * Waits one frame for the view to update, then upates the ink bar
     * Note: This must be run outside of the zone or it will create an infinite change detection loop
     * TODO: internal
     */
    ngAfterViewChecked(): void;
    /** Tells the ink-bar to align itself to the current label wrapper */
    private _updateInkBar();
    /**
     * Reference to the current label wrapper; defaults to null for initial render before the
     * ViewChildren references are ready.
     */
    private _currentLabelWrapper;
    /** Tracks which element has focus; used for keyboard navigation */
    /** When the focus index is set, we must manually send focus to the correct label */
    focusIndex: number;
    private _createChangeEvent(index);
    /** Returns a unique id for each tab label element */
    _getTabLabelId(i: number): string;
    /** Returns a unique id for each tab content element */
    _getTabContentId(i: number): string;
    handleKeydown(event: KeyboardEvent): void;
    /** Increment the focus index by 1; prevent going over the number of tabs */
    focusNextTab(): void;
    /** Decrement the focus index by 1; prevent going below 0 */
    focusPreviousTab(): void;
}
export declare const MD_TABS_DIRECTIVES: (typeof MdTabGroup | typeof MdTabLabel | typeof MdTab)[];