/**
 * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
import type Editor from '@ckeditor/ckeditor5-core/src/editor/editor.js';
export declare const DEFAULT_GROUP_ID: "common";
/**
 * A common namespace for various accessibility features of the editor.
 *
 * **Information about editor keystrokes**
 *
 * * The information about keystrokes available in the editor is stored in the {@link #keystrokeInfos} property.
 * * New info entries can be added using the {@link #addKeystrokeInfoCategory}, {@link #addKeystrokeInfoGroup},
 * and {@link #addKeystrokeInfos} methods.
 */
export default class Accessibility {
    /**
     * Stores information about keystrokes brought by editor features for the users to interact with the editor, mainly
     * keystroke combinations and their accessible labels.
     *
     * This information is particularly useful for screen reader and other assistive technology users. It gets displayed
     * by the {@link module:ui/editorui/accessibilityhelp/accessibilityhelp~AccessibilityHelp Accessibility help} dialog.
     *
     * Keystrokes are organized in categories and groups. They can be added using ({@link #addKeystrokeInfoCategory},
     * {@link #addKeystrokeInfoGroup}, and {@link #addKeystrokeInfos}) methods.
     *
     * Please note that:
     * * two categories are always available:
     *   * `'contentEditing'` for keystrokes related to content creation,
     *   * `'navigation'` for keystrokes related to navigation in the UI and the content.
     * * unless specified otherwise, new keystrokes are added into the `'contentEditing'` category and the `'common'`
     * keystroke group within that category while using the {@link #addKeystrokeInfos} method.
     */
    readonly keystrokeInfos: KeystrokeInfos;
    /**
     * The editor instance.
     */
    private readonly _editor;
    /**
     * @inheritDoc
     */
    constructor(editor: Editor);
    /**
     * Adds a top-level category in the {@link #keystrokeInfos keystroke information database} with a label and optional description.
     *
     * Categories organize keystrokes and help users to find the right keystroke. Each category can have multiple groups
     * of keystrokes that narrow down the context in which the keystrokes are available. Every keystroke category comes
     * with a `'common'` group by default.
     *
     * By default, two categories are available:
     * * `'contentEditing'` for keystrokes related to content creation,
     * * `'navigation'` for keystrokes related to navigation in the UI and the content.
     *
     * To create a new keystroke category with new groups, use the following code:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfoCategory( {
     * 			id: 'myCategory',
     * 			label: t( 'My category' ),
     * 			description: t( 'My category description.' ),
     * 			groups: [
     * 				{
     * 					id: 'myGroup',
     * 					label: t( 'My keystroke group' ),
     * 					keystrokes: [
     * 						{
     * 							label: t( 'Keystroke label 1' ),
     * 							keystroke: 'Ctrl+Shift+N'
     * 						},
     * 						{
     * 							label: t( 'Keystroke label 2' ),
     * 							keystroke: 'Ctrl+Shift+M'
     * 						}
     * 					]
     * 				}
     * 			]
     * 		};
     * 	}
     * }
     * ```
     *
     * See {@link #keystrokeInfos}, {@link #addKeystrokeInfoGroup}, and {@link #addKeystrokeInfos}.
     */
    addKeystrokeInfoCategory({ id, label, description, groups }: AddKeystrokeInfoCategoryData): void;
    /**
     * Adds a group of keystrokes in a specific category to the {@link #keystrokeInfos keystroke information database}.
     *
     * Groups narrow down the context in which the keystrokes are available. When `categoryId` is not specified,
     * the group goes to the `'contentEditing'` category (default).
     *
     * To create a new group within an existing category, use the following code:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfoGroup( {
     * 			id: 'myGroup',
     * 			categoryId: 'navigation',
     * 			label: t( 'My keystroke group' ),
     * 			keystrokes: [
     * 				{
     * 					label: t( 'Keystroke label 1' ),
     * 					keystroke: 'Ctrl+Shift+N'
     * 				},
     * 				{
     * 					label: t( 'Keystroke label 2' ),
     * 					keystroke: 'Ctrl+Shift+M'
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     *
     * See {@link #keystrokeInfos}, {@link #addKeystrokeInfoCategory}, and {@link #addKeystrokeInfos}.
     */
    addKeystrokeInfoGroup({ categoryId, id, label, keystrokes }: AddKeystrokeInfoGroupData): void;
    /**
     * Adds information about keystrokes to the {@link #keystrokeInfos keystroke information database}.
     *
     * Keystrokes without specified `groupId` or `categoryId` go to the `'common'` group in the `'contentEditing'` category (default).
     *
     * To add a keystroke brought by your plugin (using default group and category), use the following code:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfos( {
     * 			keystrokes: [
     * 				{
     * 					label: t( 'Keystroke label' ),
     * 					keystroke: 'CTRL+B'
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     * To add a keystroke in a specific existing `'widget'` group in the default `'contentEditing'` category:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfos( {
     * 			// Add a keystroke to the existing "widget" group.
     * 			groupId: 'widget',
     * 			keystrokes: [
     * 				{
     * 					label: t( 'A an action on a selected widget' ),
     * 					keystroke: 'Ctrl+D',
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     *
     * To add a keystroke to another existing category (using default group):
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfos( {
     * 			// Add keystrokes to the "navigation" category (one of defaults).
     * 			categoryId: 'navigation',
     * 			keystrokes: [
     * 				{
     * 					label: t( 'Keystroke label' ),
     * 					keystroke: 'CTRL+B'
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     *
     * See {@link #keystrokeInfos}, {@link #addKeystrokeInfoGroup}, and {@link #addKeystrokeInfoCategory}.
     */
    addKeystrokeInfos({ categoryId, groupId, keystrokes }: AddKeystrokeInfosData): void;
}
/**
 * A description of category of keystrokes accepted by the {@link module:core/accessibility~Accessibility#addKeystrokeInfoCategory} method.
 *
 * Top-level categories organize keystrokes and help users to find the right keystroke. Each category can have multiple groups of
 * keystrokes that narrow down the context in which the keystrokes are available.
 *
 * See {@link module:core/accessibility~Accessibility#addKeystrokeInfoGroup} and
 * {@link module:core/accessibility~Accessibility#addKeystrokeInfos}.
 */
export interface AddKeystrokeInfoCategoryData {
    /**
     * The unique id of the category.
     */
    id: string;
    /**
     * The label of the category.
     */
    label: string;
    /**
     * The description of the category (optional).
     */
    description?: string;
    /**
     * Groups of keystrokes within the category.
     */
    groups?: Array<AddKeystrokeInfoGroupData>;
}
/**
 * A description of keystroke group accepted by the {@link module:core/accessibility~Accessibility#addKeystrokeInfoGroup} method.
 *
 * Groups narrow down the context in which the keystrokes are available. When `categoryId` is not specified, the group goes
 * to the `'contentEditing'` category (default).
 *
 * See {@link module:core/accessibility~Accessibility#addKeystrokeInfoCategory} and
 * {@link module:core/accessibility~Accessibility#addKeystrokeInfos}.
 */
export interface AddKeystrokeInfoGroupData {
    /**
     * The category id the group belongs to.
     */
    categoryId?: string;
    /**
     * The unique id of the group.
     */
    id: string;
    /**
     * The label of the group (optional).
     */
    label?: string;
    /**
     * Keystroke definitions within the group.
     */
    keystrokes?: Array<KeystrokeInfoDefinition>;
}
/**
 * Description of keystrokes accepted by the {@link module:core/accessibility~Accessibility#addKeystrokeInfos} method.
 *
 * Keystrokes without specified `groupId` or `categoryId` go to the `'common'` group in the `'contentEditing'` category (default).
 *
 * See {@link module:core/accessibility~Accessibility#addKeystrokeInfoCategory} and
 * {@link module:core/accessibility~Accessibility#addKeystrokeInfoGroup}.
 */
export interface AddKeystrokeInfosData {
    /**
     * The category id the keystrokes belong to.
     */
    categoryId?: string;
    /**
     * The group id the keystrokes belong to.
     */
    groupId?: string;
    /**
     * An array of keystroke definitions.
     */
    keystrokes: Array<KeystrokeInfoDefinition>;
}
export type KeystrokeInfos = Map<string, KeystrokeInfoCategory>;
/**
 * A category of keystrokes in {@link module:core/accessibility~Accessibility#keystrokeInfos}.
 */
export type KeystrokeInfoCategory = {
    /**
     * The unique id of the category.
     */
    id: string;
    /**
     * The label of the category.
     */
    label: string;
    /**
     * The description of the category (optional).
     */
    description?: string;
    /**
     * Groups of keystrokes within the category.
     */
    groups: Map<string, KeystrokeInfoGroup>;
};
/**
 * A group of keystrokes in {@link module:core/accessibility~Accessibility#keystrokeInfos}.
 */
export type KeystrokeInfoGroup = {
    /**
     * The unique id of the group.
     */
    id: string;
    /**
     * The label of the group (optional).
     */
    label?: string;
    /**
     * Keystroke definitions within the group.
     */
    keystrokes: Array<KeystrokeInfoDefinition>;
};
/**
 * A keystroke info definition in {@link module:core/accessibility~Accessibility#keystrokeInfos}
 */
export interface KeystrokeInfoDefinition {
    /**
     * The label of the keystroke. It should briefly describe the action that the keystroke performs. It may contain HTML.
     */
    label: string;
    /**
     * The keystroke string. In its basic form, it must be a combination of {@link module:utils/keyboard#keyCodes known key names}
     * joined by the `+` sign, the same as the keystroke format accepted by the
     * {@link module:utils/keystrokehandler~KeystrokeHandler#set `KeystrokeHandler#set()`} method used to register most of the
     * keystroke interactions in the editor.
     *
     * * The keystroke string can represent a single keystroke, for instance: `keystroke: 'Ctrl+B'`, `keystroke: 'Shift+Enter'`,
     * `keystroke: 'Alt+F10'`, etc.
     * * The keystroke can be activated by successive press of multiple keys. For instance `keystroke: [ [ 'arrowleft', 'arrowleft' ] ]`
     * will indicate that a specific action will be performed by pressing <kbd>←</kbd> twice in a row.
     * * Keystrokes can have alternatives. For instance `keystroke: [ [ 'Ctrl+Y' ], [ 'Ctrl+Shift+Z' ] ]` will indicate that
     * a specific action can be performed by pressing either <kbd>Ctrl</kbd> + <kbd>Y</kbd> or
     * <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>Z</kbd>.
     *
     * Please note that the keystrokes are automatically translated to the environment-specific form. For example, `Ctrl+A`
     * will be rendered as `⌘A` in the {@link module:utils/env~EnvType#isMac Mac environment}. Always use the IBM PC keyboard
     * syntax, for instance `Ctrl` instead of `⌘`, `Alt` instead of `⌥`, etc.
     */
    keystroke: string | Array<string> | Array<Array<string>>;
    /**
     * This (optional) flag suggests that the keystroke(s) may require a function (<kbd>Fn</kbd>) key to be pressed
     * in order to work in the {@link module:utils/env~EnvType#isMac Mac environment}. If set `true`, an additional
     * information will be displayed next to the keystroke.
     */
    mayRequireFn?: boolean;
}
