/// <reference path="../../../vendor/react/react.d.ts" />
//@ts-ignore
import React, { Component } from 'react';
import { ImageGalleryDropdownProps, ImageGalleryDropdownState } from './types';
/**
 * Dropdown component that renders preset images. This version removes duplicates,
 * normalizes inline SVG data-URIs (reducing encoding artifacts) and performs
 * robust image loading with fallbacks.
 */
export declare class ImageGalleryDropdown extends Component<ImageGalleryDropdownProps, ImageGalleryDropdownState> {
    private dropdownRef;
    private imageCache;
    constructor(props: ImageGalleryDropdownProps);
    componentDidMount(): void;
    componentDidUpdate(prevProps: ImageGalleryDropdownProps): void;
    /**
     * Normalize data-URLs for SVGs and simple minification to eliminate encoding
     * differences which often lead to duplicate-looking assets.
     */
    private normalizeUrl;
    /**
     * Loads and caches preset images from the provided configuration while removing duplicates.
     */
    private loadImageGallery;
    /**
     * Load an image element. Uses cached HTMLImageElement when available.
     */
    private loadImage;
    /**
     * Generate a human-friendly label from URL or data-URI.
     */
    private getLabelFromUrl;
    /**
     * Handle user selecting a preset image.
     */
    private handleImageSelect;
    /**
     * Handle requesting a custom image from user.
     */
    handleCustomImageSelect: () => Promise<void>;
    /**
     * Build dropdown items grouped by category. Keeps ordering from config and
     * shows category headers only when multiple categories present.
     */
    private renderDropdownItems;
    /**
     * Render a single item - image with click action and accessible label.
     */
    private renderImageItem;
    /**
     * Button content shows selected image preview or a default icon.
     */
    private renderButtonContent;
    get viewer(): import("../../..").IImageViewer;
    get in17n(): import("i18next").i18n;
    render(): React.JSX.Element;
}
export default ImageGalleryDropdown;