/**
 * @license Copyright (c) 2003-2026, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-licensing-options
 */
/**
 * @module media-embed/mediaembedstyle/mediaembedstyleui
 */
import { Plugin } from '@ckeditor/ckeditor5-core';
import { MediaEmbedStyleEditing } from './mediaembedstyleediting.js';
/**
 * The media embed style UI plugin.
 *
 * It registers a button for every style in the resolved
 * {@link module:media-embed/mediaembedconfig~MediaEmbedConfig#styles `config.mediaEmbed.styles`}
 * list, and the default split-button dropdowns (`mediaEmbed:wrapText`, `mediaEmbed:breakText`)
 * — filtered to the styles that survived configuration. The resulting components can be placed
 * in the {@link module:media-embed/mediaembedconfig~MediaEmbedConfig#toolbar media embed toolbar}.
 */
export declare class MediaEmbedStyleUI extends Plugin {
    /**
     * @inheritDoc
     */
    static get requires(): readonly [typeof MediaEmbedStyleEditing];
    /**
     * @inheritDoc
     */
    static get pluginName(): "MediaEmbedStyleUI";
    /**
     * @inheritDoc
     */
    static get isOfficialPlugin(): true;
    /**
     * @inheritDoc
     */
    init(): void;
    /**
     * Returns the alignment button definitions sourced from the resolved options list.
     */
    private _getButtonDefinitions;
    /**
     * Returns the localized titles of the built-in styles and dropdowns.
     */
    private _getLocalizedTitles;
    /**
     * Returns the split-button dropdown definitions, filtered to the styles present in the
     * resolved options list. Combines the {@link module:media-embed/mediaembedstyle/constants~DEFAULT_DROPDOWN_DEFINITIONS
     * built-in dropdowns} with custom dropdowns declared inline in
     * {@link module:media-embed/mediaembedconfig~MediaEmbedConfig#toolbar `config.mediaEmbed.toolbar`}.
     *
     * A dropdown with fewer than two items is skipped — a single-item dropdown carries no value
     * over the flat button. If the configured `defaultItem` was filtered out, the first surviving
     * item becomes the default.
     *
     * When a *custom* dropdown's items reference styles that are not in the resolved options list,
     * a console warning is emitted (the integrator's config was not fully honored). Built-in
     * dropdowns auto-skip silently — they are added by the plugin, not the integrator.
     */
    private _getDropdownDefinitions;
    /**
     * Scans `config.mediaEmbed.toolbar` for entries shaped like a dropdown definition
     * (objects with both `items` and `defaultItem`) and returns the valid ones. `defaultItem`
     * is the discriminator between our split-button dropdowns and generic toolbar groupings
     * (which use `items` + `label` and have no `defaultItem`).
     *
     * Invalid entries (wrong name prefix, `defaultItem` missing from `items`) are warned and
     * dropped here. Items that reference filtered-out styles are filtered later by
     * {@link #_getDropdownDefinitions}, alongside the same logic that applies to built-in
     * dropdowns.
     */
    private _collectCustomDropdowns;
    /**
     * Registers a single alignment toggle button in the component factory.
     */
    private _createButton;
    /**
     * Registers a split-button dropdown grouping a set of alignment buttons. The action button
     * reflects whichever child option is currently `isOn`, falling back to the dropdown's
     * `defaultItem` when nothing is active.
     */
    private _createDropdown;
}