import { OnDestroy, QueryList, EventEmitter, ChangeDetectorRef, AfterContentInit } from '@angular/core';
import { ControlValueAccessor, NgControl } from '@angular/forms';
import { ButtonHost, ButtonComponent } from '../button/index';
import { FormControlInput, FormControlErrorStateAgent, FormControlHost } from '../form-control-group/index';
export declare class ButtonGroupComponent implements OnDestroy, ControlValueAccessor, AfterContentInit, ButtonHost, FormControlInput {
    private cdRef;
    ngControl?: NgControl;
    private formControlHost?;
    private _errorStateAgent?;
    constructor(cdRef: ChangeDetectorRef, ngControl?: NgControl, formControlHost?: FormControlHost, _errorStateAgent?: FormControlErrorStateAgent);
    private buttonsSub?;
    private _generatedId;
    private stateChangedEmitter;
    stateChanged: import("rxjs").Observable<void>;
    controlType: string;
    id?: string;
    value: any | any[];
    valueChange: EventEmitter<any>;
    _hostClasses: boolean;
    readonly elementId: string;
    buttons?: QueryList<ButtonComponent>;
    private _disabled;
    disabled: boolean;
    selectionMode: 'multiple' | 'single';
    formDisabled: boolean;
    errorStateAgent?: FormControlErrorStateAgent;
    readonly hasError: boolean;
    readonly isDisabled: boolean;
    readonly isFocused: boolean;
    private toggle;
    private syncButtons;
    onLabelClick(event: Event): void;
    notifyButtonClick(btn: ButtonComponent): void;
    notifyButtonBlur(btn: any): void;
    notifyButtonFocus(btn: any): void;
    private triggerChange;
    getError(error: string): any;
    ngAfterContentInit(): void;
    ngOnDestroy(): void;
    /**
     * things needed for ControlValueAccessor-Interface
     */
    private onChange;
    private onTouched;
    writeValue(value: any): void;
    registerOnChange(fn: any): void;
    registerOnTouched(fn: any): void;
    setDisabledState(disabled: boolean): void;
}