import { ElementRef, InjectionToken } from '@angular/core';
export declare type EventContext = ElementRef | undefined;
export declare type ScrollbarAppearance = 'standard' | 'compact' | undefined;
export declare type ScrollbarTrack = 'vertical' | 'horizontal' | 'all' | undefined;
export declare type ScrollbarVisibility = 'hover' | 'always' | 'native' | undefined;
export declare type ScrollbarPosition = 'native' | 'invertY' | 'invertX' | 'invertAll' | undefined;
export declare const NG_SCROLLBAR_OPTIONS: InjectionToken<NgScrollbarOptions>;
export interface NgScrollbarOptions {
    /**
     * Sets the scroll axis of the viewport, there are 3 options:
     *
     * - `vertical` Use both vertical and horizontal scrollbar-control
     * - `horizontal` Use both vertical and horizontal scrollbar-control
     * - `all` Use both vertical and horizontal scrollbar-control
     */
    track?: ScrollbarTrack;
    /**
     * When to show the scrollbar, and there are 3 options:
     *
     * - `native` (default) Scrollbar will be visible when viewport is scrollable like with native scrollbar-control
     * - `hover` Scrollbars are hidden by default, only visible on scrolling or hovering
     * - `always` Scrollbars are always shown even if the viewport is not scrollable
     */
    visibility?: ScrollbarVisibility;
    /**
     *  Sets the appearance of the scrollbar, there are 2 options:
     *
     * - `standard` (default) scrollbar space will be reserved just like with native scrollbar-control.
     * - `compact` scrollbar doesn't reserve any space, they are placed over the viewport.
     */
    appearance?: ScrollbarAppearance;
    /**
     * Sets the position of each scrollbar, there are 4 options:
     *
     * - `native` (Default) Use the default position like in native scrollbar-control.
     * - `invertY` Inverts vertical scrollbar position
     * - `invertX` Inverts Horizontal scrollbar position
     * - `invertAll` Inverts both scrollbar-control positions
     */
    position?: ScrollbarPosition;
    /** A class forwarded to scrollable viewport element */
    viewClass?: string;
    /** A class forwarded to the scrollbar track element */
    trackClass?: string;
    /** A class forwarded to the scrollbar thumb element */
    thumbClass?: string;
    /** The minimum scrollbar thumb size in px */
    minThumbSize?: number;
    /** The duration which the scrolling takes to reach its target when scrollbar rail is clicked */
    trackClickScrollDuration?: number;
    /** A flag used to enable/disable the scrollbar track clicked event */
    trackClickDisabled?: boolean;
    /** A flag used to enable/disable the scrollbar thumb dragged event */
    thumbDragDisabled?: boolean;
    /** Debounce interval for detecting changes via window.resize event */
    windowResizeDebounce?: number;
    /** Debounce interval for detecting changes via ResizeObserver */
    sensorDebounce?: number;
    /** Whether ResizeObserver is disabled */
    sensorDisabled?: boolean;
}
/**
 * Set of attributes added on the scrollbar wrapper
 */
export interface NgScrollbarState {
    position?: ScrollbarPosition;
    track?: ScrollbarTrack;
    appearance?: ScrollbarAppearance;
    visibility?: ScrollbarVisibility;
    disabled?: boolean;
    dir?: 'rtl' | 'ltr';
    verticalUsed?: boolean;
    horizontalUsed?: boolean;
    isVerticallyScrollable?: boolean;
    isHorizontallyScrollable?: boolean;
    verticalHovered?: boolean;
    horizontalHovered?: boolean;
    verticalDragging?: boolean;
    horizontalDragging?: boolean;
}