import { FocusMonitor } from '@angular/cdk/a11y';
import { ChangeDetectorRef, ElementRef, EventEmitter } from '@angular/core';
import { ControlValueAccessor, NgControl } from '@angular/forms';
import { RdsNullParameter, RdsNullParameterOption } from '../core/models/filter/null-filter.model';
import * as i0 from "@angular/core";
export declare class RdsNullFilterComponent implements ControlValueAccessor {
    _control: NgControl;
    private _changeDetectorRef;
    private _focusMonitor;
    /** Whether the control is disabled, default to false */
    get disabled(): boolean | string;
    set disabled(value: boolean | string);
    private _disabled;
    /** Whether the control is required, defaults to false */
    required: boolean;
    /** Label for mat-select, defaults to null */
    selectLabel: string | null;
    /** The selected null parameter and value for this control, defaults to null/unselected */
    set value(value: RdsNullParameter | undefined);
    get value(): RdsNullParameter | undefined;
    private _value;
    /** Changed value of the form control */
    readonly selectionChange: EventEmitter<"NOT_APPLIED" | "!=NULL" | "=NULL" | null>;
    _options: Array<RdsNullParameterOption>;
    /** `View -> model callback called when value changes` */
    _onChange: (value: unknown) => void;
    /** `View -> model callback called when select has been touched` */
    _onTouched: () => void;
    constructor(_control: NgControl, elementRef: ElementRef<HTMLElement>, _changeDetectorRef: ChangeDetectorRef, _focusMonitor: FocusMonitor);
    /**
     * Saves a callback function to be invoked when the select's value
     * changes from user input. Part of the ControlValueAccessor interface
     * required to integrate with Angular's core forms API.
     *
     * @param fn Callback to be triggered when the value changes.
     */
    registerOnChange(fn: (value: unknown) => void): void;
    /**
     * Saves a callback function to be invoked when the select is blurred
     * by the user. Part of the ControlValueAccessor interface required
     * to integrate with Angular's core forms API.
     *
     * @param fn Callback to be triggered when the component has been touched.
     */
    registerOnTouched(fn: () => void): void;
    setDisabledState(isDisabled: boolean): void;
    writeValue(obj: RdsNullParameter | undefined): void;
    _emitChangeEvent(newValue: RdsNullParameter | null): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<RdsNullFilterComponent, [{ optional: true; self: true; }, null, null, null]>;
    static ɵcmp: i0.ɵɵComponentDeclaration<RdsNullFilterComponent, "rds-c-null-filter", never, { "disabled": "disabled"; "required": "required"; "selectLabel": "selectLabel"; "value": "value"; }, { "selectionChange": "selectionChange"; }, never, never>;
}