text: /**
   * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
   * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
   */
  
  /**
   * @module minimap/minimap
   */
  
  import { Plugin } from 'ckeditor5/src/core';
  import { global } from 'ckeditor5/src/utils';
  import MinimapView from './minimapview';
  import {
  	// @if CK_DEBUG_MINIMAP // RectDrawer,
  
  	cloneEditingViewDomRoot,
  	getClientHeight,
  	getDomElementRect,
  	getPageStyles,
  	getScrollable,
  	findClosestScrollableAncestor
  } from './utils';
  
  import '../theme/minimap.css';
  
  /**
   * The content minimap feature.
   *
   * @extends module:core/plugin~Plugin
   */
  export default class Minimap extends Plugin {
  	/**
  	 * @inheritDoc
  	 */
  	static get pluginName() {
  		return 'Minimap';
  	}
  
  	/**
  	 * @inheritDoc
  	 */
  	init() {
  		const editor = this.editor;
  
  		/**
  		 * The reference to the view of the minimap.
  		 *
  		 * @private
  		 * @member {module:minimap/minimapview~MinimapView}
  		 */
  		this._minimapView = null;
  
  		/**
  		 * The DOM element closest to the editable element of the editor as returned
  		 * by {@link module:core/editor/editorui~EditorUI#getEditableElement}.
  		 *
  		 * @private
  		 * @member {HTMLElement}
  		 */
  		this._scrollableRootAncestor = null;
  
  		this.listenTo( editor.ui, 'ready', this._onUiReady.bind( this ) );
  	}
  
  	/**
  	 * @inheritDoc
  	 */
  	destroy() {
  		this._minimapView.destroy();
  		this._minimapView.element.remove();
  	}
  
  	/**
  	 * Initializes the minimap view element and starts the layout synchronization
  	 * on the editing view `render` event.
  	 *
  	 * @private
  	 */
  	_onUiReady() {
  		const editor = this.editor;
  
  		// TODO: This will not work with the multi-root editor.
  		const editingRootElement = this._editingRootElement = editor.ui.getEditableElement();
  
  		this._scrollableRootAncestor = findClosestScrollableAncestor( editingRootElement );
  
  		// DOM root element is not yet attached to the document.
  		if ( !editingRootElement.ownerDocument.body.contains( editingRootElement ) ) {
  			editor.ui.once( 'update', this._onUiReady.bind( this ) );
  
  			return;
  		}
  
  		this._initializeMinimapView();
  
  		this.listenTo( editor.editing.view, 'render', () => {
  			this._syncMinimapToEditingRootScrollPosition();
  		} );
  
  		this._syncMinimapToEditingRootScrollPosition();
  	}
  
  	/**
  	 * Initializes the minimap view and attaches listeners that make it responsive to the environment (document)
  	 * but also allow the minimap to control the document (scroll position).
  	 *
  	 * @private
  	 */
  	_initializeMinimapView() {
  		const editor = this.editor;
  		const locale = editor.locale;
  		const useSimplePreview = editor.config.get( 'minimap.useSimplePreview' );
  		const minimapContainerElement = editor.config.get( 'minimap.container' );
  		const scrollableRootAncestor = this._scrollableRootAncestor;
  
  		// TODO: This should be dynamic, the root width could change as the viewport scales if not fixed unit.
  		const editingRootElementWidth = getDomElementRect( this._editingRootElement ).width;
  		const minimapContainerWidth = getDomElementRect( minimapContainerElement ).width;
  		const minimapScaleRatio = minimapContainerWidth / editingRootElementWidth;
  
  		const minimapView = this._minimapView = new MinimapView( {
  			locale,
  			scaleRatio: minimapScaleRatio,
  			pageStyles: getPageStyles(),
  			extraClasses: editor.config.get( 'minimap.extraClasses' ),
  			useSimplePreview,
  			domRootClone: cloneEditingViewDomRoot( editor )
  		} );
  
  		minimapView.render();
  
  		// Scrollable ancestor scroll -> minimap position update.
  		minimapView.listenTo( global.document, 'scroll', ( evt, data ) => {
  			if ( scrollableRootAncestor === global.document.body ) {
  				if ( data.target !== global.document ) {
  					return;
  				}
  			} else if ( data.target !== scrollableRootAncestor ) {
  				return;
  			}
  
  			this._syncMinimapToEditingRootScrollPosition();
  		}, { useCapture: true, usePassive: true } );
  
  		// Viewport resize -> minimap position update.
  		minimapView.listenTo( global.window, 'resize', () => {
  			this._syncMinimapToEditingRootScrollPosition();
  		} );
  
  		// Dragging the visible content area -> document (scrollable) position update.
  		minimapView.on( 'drag', ( evt, movementY ) => {
  			let movementYPercentage;
  
  			if ( minimapView.scrollHeight === 0 ) {
  				movementYPercentage = 0;
  			} else {
  				movementYPercentage = movementY / minimapView.scrollHeight;
  			}
  
  			const absoluteScrollProgress = movementYPercentage *
  				( scrollableRootAncestor.scrollHeight - getClientHeight( scrollableRootAncestor ) );
  			const scrollable = getScrollable( scrollableRootAncestor );
  
  			scrollable.scrollBy( 0, Math.round( absoluteScrollProgress ) );
  		} );
  
  		// Clicking the minimap -> center the document (scrollable) to the corresponding position.
  		minimapView.on( 'click', ( evt, percentage ) => {
  			const absoluteScrollProgress = percentage * scrollableRootAncestor.scrollHeight;
  			const scrollable = getScrollable( scrollableRootAncestor );
  
  			scrollable.scrollBy( 0, Math.round( absoluteScrollProgress ) );
  		} );
  
  		minimapContainerElement.appendChild( minimapView.element );
  	}
  
  	/**
  	 * @private
  	 */
  	_syncMinimapToEditingRootScrollPosition() {
  		const editingRootElement = this._editingRootElement;
  		const minimapView = this._minimapView;
  
  		minimapView.setContentHeight( editingRootElement.offsetHeight );
  
  		const editingRootRect = getDomElementRect( editingRootElement );
  		const scrollableRootAncestorRect = getDomElementRect( this._scrollableRootAncestor );
  		let scrollProgress;
  
  		// @if CK_DEBUG_MINIMAP // RectDrawer.clear();
  		// @if CK_DEBUG_MINIMAP // RectDrawer.draw( scrollableRootAncestorRect, { outlineColor: 'red' }, 'scrollableRootAncestor' );
  		// @if CK_DEBUG_MINIMAP // RectDrawer.draw( editingRootRect, { outlineColor: 'green' }, 'editingRoot' );
  
  		// The root is completely visible in the scrollable ancestor.
  		if ( scrollableRootAncestorRect.contains( editingRootRect ) ) {
  			scrollProgress = 0;
  		} else {
  			if ( editingRootRect.top > scrollableRootAncestorRect.top ) {
  				scrollProgress = 0;
  			} else {
  				scrollProgress = ( editingRootRect.top - scrollableRootAncestorRect.top ) /
  					( scrollableRootAncestorRect.height - editingRootRect.height );
  
  				scrollProgress = Math.max( 0, Math.min( scrollProgress, 1 ) );
  			}
  		}
  
  		// The intersection helps to change the tracker height when there is a lot of padding around the root.
  		// Note: It is **essential** that the height is set first because the progress depends on the correct tracker height.
  		minimapView.setPositionTrackerHeight( scrollableRootAncestorRect.getIntersection( editingRootRect ).height );
  		minimapView.setScrollProgress( scrollProgress );
  	}
  }
  
  /**
   * The configuration of the minimap feature. Introduced by the {@link module:minimap/minimap~Minimap} feature.
   *
   * Read more in {@link module:minimap/minimap~MinimapConfig}.
   *
   * @member {module:minimap/minimap~MinimapConfig} module:core/editor/editorconfig~EditorConfig#minimap
   */
  
  /**
   * The configuration of the {@link module:minimap/minimap~Minimap} feature.
   *
   *		ClassicEditor
   *			.create( {
   *				minimap: ... // Minimap feature config.
   *			} )
   *			.then( ... )
   *			.catch( ... );
   *
   * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.
   *
   * @interface MinimapConfig
   */
  
  /**
   * The DOM element container for the minimap.
   *
   * **Note**: The container must have a fixed `width` and `overflow: hidden` for the minimap to work correctly.
   *
   * @member {HTMLElement} module:minimap/minimap~MinimapConfig#container
   */
  
  /**
   * When set to `true`, the minimap will render content as simple boxes instead of replicating the look of the content (default).
   *
   * @member {HTMLElement} module:minimap/minimap~MinimapConfig#useSimplePreview
   */
  
  /**
   * Extra CSS class (or classes) that will be set internally on the `<body>` element of the `<iframe>` enclosing the minimap.
   *
   * By default, the minimap feature will attempt to clone all website styles and re-apply them in the `<iframe>` for the best accuracy.
   * However, this may not work if the content of your editor inherits the styles from parent containers, resulting in inconsistent
   * look and imprecise scrolling of the minimap.
   *
   * This optional configuration can address these issues by ensuring the same CSS rules apply to the content of the minimap
   * and the original content of the editor.
   *
   * For instance, consider the following DOM structure:
   *
   *		<div class="website">
   *			<!-- ... -->
   *			<div class="styled-container">
   *				 <!-- ... -->
   *				<div id="editor">
   *					<!-- content of the editor -->
   *				</div>
   *			</div>
   *			<!-- ... -->
   *		</div>
   *
   * and the following CSS styles:
   *
   *		.website p {
   *			font-size: 13px;
   *		}
   *
   *		.styled-container p {
   *			color: #ccc;
   *		}
   *
   * To maintain the consistency of styling (`font-size` and `color` of paragraphs), you will need to pass the CSS class names
   * of these containers:
   *
   *		ClassicEditor
   *			.create( document.getElementById( 'editor' ), {
   *				minimap: {
   *					extraClasses: 'website styled-container'
   *				}
   *			} )
   *			.then( ... )
   *			.catch( ... );
   *
   * @member {String} module:minimap/minimap~MinimapConfig#extraClasses
   */
  