import { Dropdown } from './models';
import * as i0 from "@angular/core";
export declare type Events = KeyboardEvent | MouseEvent | FocusEvent;
export declare class DropdownService {
    private static minSpaceForDropdown;
    private static shouldUseFullHeightDropdownRatio;
    private onDocumentClickBinding;
    private onDocumentKeydownBinding;
    private onWindowScrollBinding;
    private onWindowBlurBinding;
    private activeDropdown;
    /**
     * This saves the records for the last opened dropdowns
     */
    private dropdownList;
    private heightCalculationObject;
    /**
     * opens a dropdown and sets it to active
     * @param dropdown The dropdown to open
     * @param calculateHeight Whether to do height calculation
     * @param event The event
     */
    open(dropdown: Dropdown, calculateHeight?: boolean, displayToSide?: boolean): Promise<void>;
    /**
     * updates the position of a dropdown so that it remains on screen
     * @param dropdown The dropdown to update
     * @param calculateHeight Defines whether to calculate height of the dropdown based on window size.
     */
    updatePosition(dropdown: Dropdown, calculateHeight?: boolean, displayToSide?: boolean): void;
    /**
     * Marks a dropdown as closed, if the dropdown is the active dropdown,
     * the active dropdown is reset and event handlers are removed.
     * @param dropdown The dropdown to close
     */
    close(dropdown: Dropdown, event?: Events): void;
    /**
     * Handles document clicks while a dropdown is open
     */
    private onDocumentClick;
    /**
     * Handles document keydowns while a dropdown is open
     */
    private onDocumentKeydown;
    /**
     * Handles document scrolling while a dropdown is open
     */
    private onWindowScroll;
    /**
     * Handles window blurs while a dropdown is open
     */
    private onWindowBlur;
    /**
    * Handles the position calculation for the left of the dropdown container
    * Decides whether to place the dropdown left, right, or on top of the toggle button
    */
    private dropdownSetPositionLeft;
    /**
     * Handles the position calculation for the top of the dropdown container
     * Decides whether to place the dropdown above or below the toggle button
     */
    private dropdownSetPositionTop;
    /**
     * It handles the height calculation for the dropdown container
     * It calculates based on the heightCalculationObject
     * First try to put the dropdown container to decide whether a scroll bar is needed
     * Then apply the height from calculation
     */
    private dropdownCalculateHeightTop;
    /**
     * Calculates whether should update the height pixels for the dropdown
     */
    private shouldUpdateHeight;
    /**
     * Get dropdown margin base on the calculation object
     */
    private getDropdownMargin;
    /**
     * Deal with nested close for dropdown
     * @param dropdown the active dropdown
     * @param event contains the current event target
     */
    closeNested(dropdown: Dropdown, event: Events): void;
    /**
     * It handles closing all the expanded dropdowns
     */
    private closeNestedAllExpandedDropdowns;
    /**
     * It handles closing the dropdown from the component
     */
    private closeNestedHelper;
    /**
     * It handles when opening a dropdown when other dropdown(s) is/are open
     */
    private closeNestedOnOpen;
    /**
     * It handles whether two dropdowns are from the same parent
     */
    private isFromSameParent;
    static ɵfac: i0.ɵɵFactoryDeclaration<DropdownService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<DropdownService>;
}