import { AfterViewChecked, ElementRef, OnDestroy } from '@angular/core';
import * as i0 from "@angular/core";
export declare class ClrDropdownOverflowDirective implements AfterViewChecked, OnDestroy {
    private elRef;
    clrDropdownMenuMaxHeight: string | number;
    clrDropdownMenuItemMinHeight: string | number;
    set clrMarginBottom(value: string | number);
    private nestedDropdownChildren;
    readonly defaultItemMinHeightRem = 1.5;
    private alreadyChecked;
    private marginBottomPx;
    private nestedDropdownSubscription;
    constructor(elRef: ElementRef);
    ngAfterViewChecked(): void;
    ngOnDestroy(): void;
    private applyDropdownOverflowStyles;
    private removeDropdownOverflowStyles;
    private getAllChildDropdownMenuItems;
    private getMenuMaxHeight;
    private getItemMinHeight;
    private convertToPixels;
    private convertRemToPixels;
    private convertVhToPixels;
    static ɵfac: i0.ɵɵFactoryDeclaration<ClrDropdownOverflowDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ClrDropdownOverflowDirective, "clr-dropdown-menu", never, { "clrDropdownMenuMaxHeight": { "alias": "clrDropdownMenuMaxHeight"; "required": false; }; "clrDropdownMenuItemMinHeight": { "alias": "clrDropdownMenuItemMinHeight"; "required": false; }; "clrMarginBottom": { "alias": "clrMarginBottom"; "required": false; }; }, {}, ["nestedDropdownChildren"], never, false, never>;
}