import { ChangeDetectorRef, EventEmitter, ElementRef } from '@angular/core';
import { CanDisable } from '@dynatrace/ngx-groundhog/core';
/** Event object emitted by GhOption when selected or deselected. */
export interface GhOptionSelectionChange {
    /** Reference to the option that emitted the event. */
    source: GhOption;
    /** Whether the change in the option's value was a result of a user action. */
    isUserInput: boolean;
}
export declare class GhOptionBase {
    constructor();
}
export declare const _GhOptionMixinBase: (new (...args: any[]) => CanDisable) & typeof GhOptionBase;
export declare class GhOption extends _GhOptionMixinBase implements CanDisable {
    private _changeDetectorRef;
    private _elementRef;
    private _active;
    private _selected;
    private _id;
    readonly selected: boolean;
    /** The displayed value of the option. */
    readonly viewValue: string;
    /** The unique ID of the option. */
    readonly id: string;
    /**
     * Whether or not the option is currently active and ready to be selected.
     * An active option displays styles as if it is focused, but the
     * focus is actually retained somewhere else. This comes in handy
     * for components like autocomplete where focus must remain on the input.
     */
    readonly active: boolean;
    /** The form value of the option. */
    value: any;
    /** Event emitted when the option is selected or deselected. */
    readonly onSelectionChange: EventEmitter<GhOptionSelectionChange>;
    constructor(_changeDetectorRef: ChangeDetectorRef, _elementRef: ElementRef);
    /** Selects the option. */
    select(): void;
    /** Deselects the option. */
    deselect(): void;
    /** Sets focus onto this option. */
    focus(): void;
    /**
     * This method sets display styles on the option to make it appear
     * active. This is used by the ActiveDescendantKeyManager so key
     * events will display the proper options as active on arrow key events.
     */
    setActiveStyles(): void;
    /**
     * This method removes display styles on the option that made it appear
     * active. This is used by the ActiveDescendantKeyManager so key
     * events will display the proper options as active on arrow key events.
     */
    setInactiveStyles(): void;
    /** Gets the label to be used when determining whether the option should be focused. */
    getLabel(): string;
    /**
     * Selects the option while indicating the selection came from the user. Used to
     * determine if the select's view -> model callback should be invoked.
     */
    _toggleViaInteraction(): void;
    /** Ensures the option is selected when activated from the keyboard. */
    _handleKeydown(event: KeyboardEvent): void;
    /** Returns the correct tabindex for the option depending on disabled state. */
    _getTabIndex(): string;
    /** Emits the selection change event. */
    private _emitSelectionChangeEvent(isUserInput?);
}