import { EventEmitter, OnChanges, SimpleChanges } from '@angular/core';
import { ControlValueAccessor } from '@angular/forms';
import { CdkVirtualScrollViewport } from '@angular/cdk/scrolling';
import { BaseFormWidgetComponent } from '../../../shared/base-form.component';
declare global {
    interface HTMLElement {
        scroll_viewport: CdkVirtualScrollViewport;
    }
}
export declare class DropdownComponent extends BaseFormWidgetComponent<number> implements OnChanges, ControlValueAccessor {
    list: string[] | {
        name: string;
        [fields: string]: any;
    }[];
    filter: boolean;
    placeholder: string;
    hideActive: boolean;
    html: string;
    filterValue: EventEmitter<string>;
    private reference;
    private body;
    private active;
    private input;
    private viewport;
    private scroll_el;
    show: boolean;
    longest: string;
    font_size: number;
    width: number;
    list_height: number;
    list_items: any[];
    filtered_list: any[];
    bottom: boolean;
    search: string;
    ngOnChanges(changes: SimpleChanges): void;
    select(index?: number): void;
    focus(): void;
    showList(): void;
    updateScroll(): any;
    updateSize(tries?: number): void;
    resize(): void;
    filterItems(): void;
    private processList;
}