import { IContextualMenuProps, IContextualMenuItem } from './ContextualMenu.types';
import { DirectionalHint } from '../../common/DirectionalHint';
import { BaseComponent } from '../../Utilities';
export interface IContextualMenuState {
    expandedMenuItemKey?: string;
    /** True if the menu was expanded by mouse click OR hover (as opposed to by keyboard) */
    expandedByMouseClick?: boolean;
    dismissedMenuItemKey?: string;
    contextualMenuItems?: IContextualMenuItem[];
    contextualMenuTarget?: Element;
    submenuTarget?: Element;
    positions?: any;
    slideDirectionalClassName?: string;
    subMenuId?: string;
    submenuDirection?: DirectionalHint;
}
export declare function getSubmenuItems(item: IContextualMenuItem): IContextualMenuItem[] | undefined;
/**
 * Returns true if a list of menu items can contain a checkbox
 */
export declare function canAnyMenuItemsCheck(items: IContextualMenuItem[]): boolean;
export declare class ContextualMenuBase extends BaseComponent<IContextualMenuProps, IContextualMenuState> {
    static defaultProps: IContextualMenuProps;
    private _host;
    private _previousActiveElement;
    private _isFocusingPreviousElement;
    private _enterTimerId;
    private _targetWindow;
    private _target;
    private _isScrollIdle;
    private _scrollIdleTimeoutId;
    /** True if the most recent keydown event was for alt (option) or meta (command). */
    private _lastKeyDownWasAltOrMeta;
    private _shouldUpdateFocusOnMouseEvent;
    private _gotMouseMove;
    private _mounted;
    private _adjustedFocusZoneProps;
    private _classNames;
    constructor(props: IContextualMenuProps);
    dismiss: (ev?: any, dismissAll?: boolean | undefined) => void;
    shouldComponentUpdate(newProps: IContextualMenuProps, newState: IContextualMenuState): boolean;
    UNSAFE_componentWillUpdate(newProps: IContextualMenuProps): void;
    UNSAFE_componentWillMount(): void;
    componentDidMount(): void;
    componentWillUnmount(): void;
    render(): JSX.Element | null;
    /**
     * Return whether the contextual menu is hidden.
     * Undefined value for hidden is equivalent to hidden being false.
     * @param props - Props for the component
     */
    private _isHidden;
    private _onMenuOpened;
    private _onMenuClosed;
    private _tryFocusPreviousActiveElement;
    /**
     * Gets the focusZoneDirection by using the arrowDirection if specified,
     * the direction specificed in the focusZoneProps, or defaults to FocusZoneDirection.vertical
     */
    private _getFocusZoneDirection;
    private _onRenderSubMenu;
    private _onRenderMenuList;
    private _renderMenuItem;
    private _renderSectionItem;
    private _renderListItem;
    private _renderSeparator;
    private _renderNormalItem;
    private _renderHeaderMenuItem;
    private _renderAnchorMenuItem;
    private _renderButtonItem;
    private _renderSplitButton;
    private _onKeyDown;
    private _shouldHandleKeyDown;
    private _onMenuFocusCapture;
    private _onKeyUp;
    /**
     * We close the menu on key up only if ALL of the following are true:
     * - Most recent key down was alt or meta (command)
     * - The alt/meta key down was NOT followed by some other key (such as down/up arrow to
     *   expand/collapse the menu)
     * - We're not on a Mac (or iOS)
     *
     * This is because on Windows, pressing alt moves focus to the application menu bar or similar,
     * closing any open context menus. There is not a similar behavior on Macs.
     */
    private _shouldHandleKeyUp;
    /**
     * Returns true if the key for the event is alt (Mac option) or meta (Mac command).
     */
    private _isAltOrMeta;
    /**
     * Calls `shouldHandleKey` to determine whether the keyboard event should be handled;
     * if so, stops event propagation and dismisses menu(s).
     * @param ev - The keyboard event.
     * @param shouldHandleKey - Returns whether we should handle this keyboard event.
     * @param dismissAllMenus - If true, dismiss all menus. Otherwise, dismiss only the current menu.
     * Only does anything if `shouldHandleKey` returns true.
     * @returns Whether the event was handled.
     */
    private _keyHandler;
    /**
     * Checks if the submenu should be closed
     */
    private _shouldCloseSubMenu;
    private _onMenuKeyDown;
    /**
     * Scroll handler for the callout to make sure the mouse events
     * for updating focus are not interacting during scroll
     */
    private _onScroll;
    private _onItemMouseEnterBase;
    private _onItemMouseMoveBase;
    private _shouldIgnoreMouseEvent;
    private _onMouseItemLeave;
    /**
     * Handles updating focus when mouseEnter or mouseMove fire.
     * As part of updating focus, This function will also update
     * the expand/collapse state accordingly.
     */
    private _updateFocusOnMouseEvent;
    private _onItemMouseDown;
    private _onItemClick;
    private _onItemClickBase;
    private _onAnchorClick;
    private _executeItemClick;
    private _onItemKeyDown;
    private _cancelSubMenuTimer;
    private _onItemSubMenuExpand;
    private _getSubmenuProps;
    private _findItemByKey;
    /**
     * Returns the item that mathes a given key if any.
     * @param key - The key of the item to match
     * @param items - The items to look for the key
     */
    private _findItemByKeyFromItems;
    /**
     * This function is called ASYNCHRONOUSLY, and so there is a chance it is called
     * after the component is unmounted. The _mounted property is added to prevent
     * from calling setState() after unmount. Do NOT copy this pattern in synchronous
     * code.
     */
    private _onSubMenuDismiss;
    private _setTargetWindowAndElement;
    private _getSubMenuId;
    private _onPointerAndTouchEvent;
}