import { ViewContainerRef, ElementRef, OnDestroy, NgZone, ComponentFactoryResolver } from '@angular/core';
import { TooltipContentComponent } from './tooltip-content.component';
import { TooltipConfig } from './tooltip.config';
import { Context } from '../enums';
import { Overlay, OverlayRef, ScrollDispatcher } from '@angular/cdk/overlay';
import { Directionality } from '@angular/cdk/bidi';
export declare class TooltipDirective implements OnDestroy {
    private _elementRef;
    private _viewContainerRef;
    overlay: Overlay;
    private _ngZone;
    private _dir;
    private _scrollDispatcher;
    private _componentFactoryResolver;
    private _config;
    _overlayRef: OverlayRef | null;
    _tooltipInstance: TooltipContentComponent | null;
    private _portal;
    private readonly _destroyed;
    position: string;
    content: string;
    disabled: boolean;
    placement: 'top' | 'bottom' | 'left' | 'right';
    showDelay: number;
    hideDelay: number;
    context: Context;
    show(): void;
    hide(): void;
    constructor(_elementRef: ElementRef, _viewContainerRef: ViewContainerRef, overlay: Overlay, _ngZone: NgZone, _dir: Directionality, _scrollDispatcher: ScrollDispatcher, _componentFactoryResolver: ComponentFactoryResolver, _config: TooltipConfig);
    /**
     * Dispose the tooltip when destroyed.
     */
    ngOnDestroy(): void;
    private _show(delay?);
    private _hide(delay?);
    private _createOverlay();
    private _updatePosition();
    /**
     * Returns the origin position and a fallback position based on the user's position preference.
     * The fallback position is the inverse of the origin (e.g. `'bottom' -> 'top'`).
     */
    private _getOrigin();
    /** Returns the overlay position and a fallback position based on the user's preference */
    private _getOverlayPosition();
    private _invertPosition(x, y);
    private _detach();
    /** Updates the tooltip content and repositions the overlay according to the new content length */
    private _updateTooltipContent();
}