import { OnChanges, OnDestroy, ElementRef, DoCheck } from '@angular/core';
import { NgControl, NgForm, FormGroupDirective } from '@angular/forms';
import { Platform } from '@angular/cdk/platform';
import { Subject } from 'rxjs/Subject';
import { ErrorStateMatcher, CanUpdateErrorState } from '@dynatrace/ngx-groundhog/core';
import { GhFormFieldControl } from '@dynatrace/ngx-groundhog/form-field';
export declare class GhInputBase {
    _defaultErrorStateMatcher: ErrorStateMatcher;
    _parentForm: NgForm;
    _parentFormGroup: FormGroupDirective;
    ngControl: NgControl;
    constructor(_defaultErrorStateMatcher: ErrorStateMatcher, _parentForm: NgForm, _parentFormGroup: FormGroupDirective, ngControl: NgControl);
}
export declare const _GhInputMixinBase: (new (...args: any[]) => CanUpdateErrorState) & typeof GhInputBase;
export declare class GhInput extends _GhInputMixinBase implements OnChanges, OnDestroy, DoCheck, GhFormFieldControl<any>, CanUpdateErrorState {
    private _elementRef;
    private _platform;
    ngControl: NgControl;
    /** Implemented as part of GhFormFieldControl. */
    id: string;
    /** Implemented as part of GhFormFieldControl. */
    disabled: boolean;
    /** Implemented as part of GhFormFieldControl. */
    required: boolean;
    placeholder: string;
    /** Input type of the element. */
    type: string;
    value: string;
    /** Whether the element is readonly. */
    readonly: boolean;
    private _readonly;
    /** An object used to control when error messages are shown. */
    errorStateMatcher: ErrorStateMatcher;
    /** Implemented as part of GhFormFieldControl.*/
    readonly empty: boolean;
    /** Implemented as part of GhFormFieldControl. */
    readonly stateChanges: Subject<void>;
    /** Implemented as part of GhFormFieldControl. */
    focused: boolean;
    /** The aria-describedby attribute on the input for improved a11y. */
    _ariaDescribedby: string;
    private readonly _inputValueAccessor;
    private _uid;
    private _id;
    private _disabled;
    private _required;
    private _type;
    private _previousNativeValue;
    constructor(_elementRef: ElementRef, _platform: Platform, ngControl: NgControl, _parentForm: NgForm, _parentFormGroup: FormGroupDirective, _defaultErrorStateMatcher: ErrorStateMatcher);
    ngOnChanges(): void;
    ngOnDestroy(): void;
    ngDoCheck(): void;
    /** Focuses the input. */
    focus(): void;
    /** Implemented as part of GhFormFieldControl. */
    setDescribedByIds(ids: string[]): void;
    /** Implemented as part of GhFormFieldControl. */
    onContainerClick(): void;
    _onInput(): void;
    /** Callback for the cases where the focused state of the input changes. */
    _focusChanged(isFocused: boolean): void;
    /** Determines if the component host is a textarea. If not recognizable it returns false. */
    private _isTextarea();
    /** Make sure the input is a supported type. */
    private _validateType();
    /** Does some manual dirty checking on the native input `value` property. */
    private _dirtyCheckNativeValue();
    /** Checks whether the input type is one of the types that are never empty. */
    private _isNeverEmpty();
    /** Checks whether the input is invalid based on the native validation. */
    protected _isBadInput(): boolean;
}