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The target's rect must be shifted\n\t\t\t// by it's iframe's position.\n\t\t\tcurrentFrame = currentWindow.frameElement;\n\t\t\tcurrentWindow = currentWindow.parent;\n\n\t\t\t// If the current window has some parent but frameElement is inaccessible, then they have\n\t\t\t// different domains/ports and, due to security reasons, accessing and scrolling\n\t\t\t// the parent window won't be possible.\n\t\t\t// See https://github.com/ckeditor/ckeditor5/issues/930.\n\t\t\tif ( !currentFrame ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t} else {\n\t\t\tcurrentWindow = null;\n\t\t}\n\t}\n}\n\n/**\n * Makes any page `HTMLElement` or `Range` (target) visible within its scrollable ancestors,\n * e.g. if they have `overflow: scroll` CSS style.\n *\n * @param {HTMLElement|Range} target A target, which supposed to become visible to the user.\n */\nexport function scrollAncestorsToShowTarget( target ) {\n\tconst targetParent = getParentElement( target );\n\n\tscrollAncestorsToShowRect( targetParent, () => {\n\t\treturn new Rect( target );\n\t} );\n}\n\n// TODO: Using a property value shorthand in the top of the file\n// causes JSDoc to throw errors. See https://github.com/cksource/docs-builder/issues/75.\nObject.assign( utils, {\n\tscrollViewportToShowTarget,\n\tscrollAncestorsToShowTarget\n} );\n\n// Makes a given rect visible within its parent window.\n//\n// Note: Avoid the situation where the caret is still in the viewport, but totally\n// at the edge of it. In such situation, if it moved beyond the viewport in the next\n// action e.g. after paste, the scrolling would move it to the viewportOffset level\n// and it all would look like the caret visually moved up/down:\n//\n// 1.\n//\t\t| foo[]\n//\t\t|                                    <--- N px of space below the caret\n//\t\t+---------------------------------...\n//\n// 2. *paste*\n// 3.\n//\t\t|\n//\t\t|\n//\t\t+-foo-----------------------------...\n//\t\t  bar[]                              <--- caret below viewport, scrolling...\n//\n// 4. *scrolling*\n// 5.\n//\t\t|\n//\t\t| foo\n//\t\t| bar[]                              <--- caret precisely at the edge\n//\t\t+---------------------------------...\n//\n// To prevent this, this method checks the rects moved by the viewportOffset to cover\n// the upper/lower edge of the viewport. It makes sure if the action repeats, there's\n// no twitching – it's a purely visual improvement:\n//\n// 5. (after fix)\n//\t\t|\n//\t\t| foo\n//\t\t| bar[]\n//\t\t|                                    <--- N px of space below the caret\n//\t\t+---------------------------------...\n//\n// @private\n// @param {Window} window A window which is scrolled to reveal the rect.\n// @param {module:utils/dom/rect~Rect} rect A rect which is to be revealed.\n// @param {Number} viewportOffset See scrollViewportToShowTarget.\nfunction scrollWindowToShowRect( window, rect, viewportOffset ) {\n\tconst targetShiftedDownRect = rect.clone().moveBy( 0, viewportOffset );\n\tconst targetShiftedUpRect = rect.clone().moveBy( 0, -viewportOffset );\n\tconst viewportRect = new Rect( window ).excludeScrollbarsAndBorders();\n\n\tconst rects = [ targetShiftedUpRect, targetShiftedDownRect ];\n\n\tif ( !rects.every( rect => viewportRect.contains( rect ) ) ) {\n\t\tlet { scrollX, scrollY } = window;\n\n\t\tif ( isAbove( targetShiftedUpRect, viewportRect ) ) {\n\t\t\tscrollY -= viewportRect.top - rect.top + viewportOffset;\n\t\t} else if ( isBelow( targetShiftedDownRect, viewportRect ) ) {\n\t\t\tscrollY += rect.bottom - viewportRect.bottom + viewportOffset;\n\t\t}\n\n\t\t// TODO: Web browsers scroll natively to place the target in the middle\n\t\t// of the viewport. It's not a very popular case, though.\n\t\tif ( isLeftOf( rect, viewportRect ) ) {\n\t\t\tscrollX -= viewportRect.left - rect.left + viewportOffset;\n\t\t} else if ( isRightOf( rect, viewportRect ) ) {\n\t\t\tscrollX += rect.right - viewportRect.right + viewportOffset;\n\t\t}\n\n\t\twindow.scrollTo( scrollX, scrollY );\n\t}\n}\n\n// Recursively scrolls element ancestors to visually reveal a rect.\n//\n// @private\n// @param {HTMLElement} A parent The first ancestors to start scrolling.\n// @param {Function} getRect A function which returns the Rect, which is to be revealed.\nfunction scrollAncestorsToShowRect( parent, getRect ) {\n\tconst parentWindow = getWindow( parent );\n\tlet parentRect, targetRect;\n\n\twhile ( parent != parentWindow.document.body ) {\n\t\ttargetRect = getRect();\n\t\tparentRect = new Rect( parent ).excludeScrollbarsAndBorders();\n\n\t\tif ( !parentRect.contains( targetRect ) ) {\n\t\t\tif ( isAbove( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollTop -= parentRect.top - targetRect.top;\n\t\t\t} else if ( isBelow( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollTop += targetRect.bottom - parentRect.bottom;\n\t\t\t}\n\n\t\t\tif ( isLeftOf( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollLeft -= parentRect.left - targetRect.left;\n\t\t\t} else if ( isRightOf( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollLeft += targetRect.right - parentRect.right;\n\t\t\t}\n\t\t}\n\n\t\tparent = parent.parentNode;\n\t}\n}\n\n// Determines if a given `Rect` extends beyond the bottom edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isBelow( firstRect, secondRect ) {\n\treturn firstRect.bottom > secondRect.bottom;\n}\n\n// Determines if a given `Rect` extends beyond the top edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isAbove( firstRect, secondRect ) {\n\treturn firstRect.top < secondRect.top;\n}\n\n// Determines if a given `Rect` extends beyond the left edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isLeftOf( firstRect, secondRect ) {\n\treturn firstRect.left < secondRect.left;\n}\n\n// Determines if a given `Rect` extends beyond the right edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isRightOf( firstRect, secondRect ) {\n\treturn firstRect.right > secondRect.right;\n}\n\n// Returns the closest window of an element or range.\n//\n// @private\n// @param {HTMLElement|Range} firstRect\n// @returns {Window}\nfunction getWindow( elementOrRange ) {\n\tif ( isRange( elementOrRange ) ) {\n\t\treturn elementOrRange.startContainer.ownerDocument.defaultView;\n\t} else {\n\t\treturn elementOrRange.ownerDocument.defaultView;\n\t}\n}\n\n// Returns the closest parent of an element or DOM range.\n//\n// @private\n// @param {HTMLElement|Range} firstRect\n// @returns {HTMLelement}\nfunction getParentElement( elementOrRange ) {\n\tif ( isRange( elementOrRange ) ) {\n\t\tlet parent = elementOrRange.commonAncestorContainer;\n\n\t\t// If a Range is attached to the Text, use the closest element ancestor.\n\t\tif ( isText( parent ) ) {\n\t\t\tparent = parent.parentNode;\n\t\t}\n\n\t\treturn parent;\n\t} else {\n\t\treturn elementOrRange.parentNode;\n\t}\n}\n\n// Returns the rect of an element or range residing in an iframe.\n// The result rect is relative to the geometry of the passed window instance.\n//\n// @private\n// @param {HTMLElement|Range} target Element or range which rect should be returned.\n// @param {Window} relativeWindow A window the rect should be relative to.\n// @returns {module:utils/dom/rect~Rect}\nfunction getRectRelativeToWindow( target, relativeWindow ) {\n\tconst targetWindow = getWindow( target );\n\tconst rect = new Rect( target );\n\n\tif ( targetWindow === relativeWindow ) {\n\t\treturn rect;\n\t} else {\n\t\tlet currentWindow = targetWindow;\n\n\t\twhile ( currentWindow != relativeWindow ) {\n\t\t\tconst frame = currentWindow.frameElement;\n\t\t\tconst frameRect = new Rect( frame ).excludeScrollbarsAndBorders();\n\n\t\t\trect.moveBy( frameRect.left, frameRect.top );\n\n\t\t\tcurrentWindow = currentWindow.parent;\n\t\t}\n\t}\n\n\treturn rect;\n}\n","/**\n * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/setdatainelement\n */\n\n/* globals HTMLTextAreaElement */\n\n/**\n * Sets data in a given element.\n *\n * @param {HTMLElement} el The element in which the data will be set.\n * @param {String} data The data string.\n */\nexport default function setDataInElement( el, data ) {\n\tif ( el instanceof HTMLTextAreaElement ) {\n\t\tel.value = data;\n\t}\n\n\tel.innerHTML = data;\n}\n","/**\n * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/resizeobserver\n */\n\n/* globals setTimeout, clearTimeout */\n\nimport mix from '../mix';\nimport global from './global';\nimport Rect from './rect';\nimport DomEmitterMixin from './emittermixin';\n\nconst RESIZE_CHECK_INTERVAL = 100;\n\n/**\n * A helper class which instances allow performing custom actions when native DOM elements are resized.\n *\n *\t\tconst editableElement = editor.editing.view.getDomRoot();\n *\n *\t\tconst observer = new ResizeObserver( editableElement, entry => {\n *\t\t\tconsole.log( 'The editable element has been resized in DOM.' );\n *\t\t\tconsole.log( entry.target ); // -> editableElement\n *\t\t\tconsole.log( entry.contentRect.width ); // -> e.g. '423px'\n *\t\t} );\n *\n * By default, it uses the [native DOM resize observer](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver)\n * under the hood and in browsers that do not support the native API yet, a polyfilled observer is\n * used instead.\n */\nexport default class ResizeObserver {\n\t/**\n\t * Creates an instance of the `ResizeObserver` class.\n\t *\n\t * @param {HTMLElement} element A DOM element that is to be observed for resizing. Note that\n\t * the element must be visible (i.e. not detached from DOM) for the observer to work.\n\t * @param {Function} callback A function called when the observed element was resized. It passes\n\t * the [`ResizeObserverEntry`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserverEntry)\n\t * object with information about the resize event.\n\t */\n\tconstructor( element, callback ) {\n\t\t// **Note**: For the maximum performance, this class ensures only a single instance of the native\n\t\t// (or polyfilled) observer is used no matter how many instances of this class were created.\n\t\tif ( !ResizeObserver._observerInstance ) {\n\t\t\tResizeObserver._createObserver();\n\t\t}\n\n\t\t/**\n\t\t * The element observer by this observer.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {HTMLElement}\n\t\t */\n\t\tthis._element = element;\n\n\t\t/**\n\t\t * The callback executed each time {@link #_element} is resized.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {Function}\n\t\t */\n\t\tthis._callback = callback;\n\n\t\tResizeObserver._addElementCallback( element, callback );\n\t\tResizeObserver._observerInstance.observe( element );\n\t}\n\n\t/**\n\t * Destroys the observer which disables the `callback` passed to the {@link #constructor}.\n\t */\n\tdestroy() {\n\t\tResizeObserver._deleteElementCallback( this._element, this._callback );\n\t}\n\n\t/**\n\t * Registers a new resize callback for the DOM element.\n\t *\n\t * @private\n\t * @static\n\t * @param {HTMLElement} element\n\t * @param {Function} callback\n\t */\n\tstatic _addElementCallback( element, callback ) {\n\t\tif ( !ResizeObserver._elementCallbacks ) {\n\t\t\tResizeObserver._elementCallbacks = new Map();\n\t\t}\n\n\t\tlet callbacks = ResizeObserver._elementCallbacks.get( element );\n\n\t\tif ( !callbacks ) {\n\t\t\tcallbacks = new Set();\n\t\t\tResizeObserver._elementCallbacks.set( element, callbacks );\n\t\t}\n\n\t\tcallbacks.add( callback );\n\t}\n\n\t/**\n\t * Removes a resize callback from the DOM element. If no callbacks are left\n\t * for the element, it removes the element from the native observer.\n\t *\n\t * @private\n\t * @static\n\t * @param {HTMLElement} element\n\t * @param {Function} callback\n\t */\n\tstatic _deleteElementCallback( element, callback ) {\n\t\tconst callbacks = ResizeObserver._getElementCallbacks( element );\n\n\t\t// Remove the element callback. Check if exist first in case someone\n\t\t// called destroy() twice.\n\t\tif ( callbacks ) {\n\t\t\tcallbacks.delete( callback );\n\n\t\t\t// If no callbacks left for the element, also remove the element.\n\t\t\tif ( !callbacks.size ) {\n\t\t\t\tResizeObserver._elementCallbacks.delete( element );\n\t\t\t\tResizeObserver._observerInstance.unobserve( element );\n\t\t\t}\n\t\t}\n\n\t\tif ( ResizeObserver._elementCallbacks && !ResizeObserver._elementCallbacks.size ) {\n\t\t\tResizeObserver._observerInstance = null;\n\t\t\tResizeObserver._elementCallbacks = null;\n\t\t}\n\t}\n\n\t/**\n\t * Returns are registered resize callbacks for the DOM element.\n\t *\n\t * @private\n\t * @static\n\t * @param {HTMLElement} element\n\t * @returns {Set.<HTMLElement>|null}\n\t */\n\tstatic _getElementCallbacks( element ) {\n\t\tif ( !ResizeObserver._elementCallbacks ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn ResizeObserver._elementCallbacks.get( element );\n\t}\n\n\t/**\n\t * Creates the single native observer shared across all `ResizeObserver` instances.\n\t * If the browser does not support the native API, it creates a polyfill.\n\t *\n\t * @private\n\t * @static\n\t */\n\tstatic _createObserver() {\n\t\tlet ObserverConstructor;\n\n\t\t// TODO: One day, the `ResizeObserver` API will be supported in all modern web browsers.\n\t\t// When it happens, this module will no longer make sense and should be removed and\n\t\t// the native implementation should be used across the project to save bytes.\n\t\t// Check out https://caniuse.com/#feat=resizeobserver.\n\t\tif ( typeof global.window.ResizeObserver === 'function' ) {\n\t\t\tObserverConstructor = global.window.ResizeObserver;\n\t\t} else {\n\t\t\tObserverConstructor = ResizeObserverPolyfill;\n\t\t}\n\n\t\tResizeObserver._observerInstance = new ObserverConstructor( entries => {\n\t\t\tfor ( const entry of entries ) {\n\t\t\t\tconst callbacks = ResizeObserver._getElementCallbacks( entry.target );\n\n\t\t\t\tif ( callbacks ) {\n\t\t\t\t\tfor ( const callback of callbacks ) {\n\t\t\t\t\t\tcallback( entry );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n\n/**\n * The single native observer instance (or polyfill in browsers that do not support the API)\n * shared across all {@link module:utils/dom/resizeobserver~ResizeObserver} instances.\n *\n * @static\n * @protected\n * @readonly\n * @property {Object|null} module:utils/dom/resizeobserver~ResizeObserver#_observerInstance\n */\nResizeObserver._observerInstance = null;\n\n/**\n * A mapping of native DOM elements and their callbacks shared across all\n * {@link module:utils/dom/resizeobserver~ResizeObserver} instances.\n *\n * @static\n * @private\n * @readonly\n * @property {Map.<HTMLElement,Set>|null} module:utils/dom/resizeobserver~ResizeObserver#_elementCallbacks\n */\nResizeObserver._elementCallbacks = null;\n\n/**\n * A polyfill class for the native [`ResizeObserver`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver).\n *\n * @private\n * @mixes module:utils/domemittermixin~DomEmitterMixin\n */\nclass ResizeObserverPolyfill {\n\t/**\n\t * Creates an instance of the {@link module:utils/dom/resizeobserver~ResizeObserverPolyfill} class.\n\t *\n\t * It synchronously reacts to resize of the window to check if observed elements' geometry changed.\n\t *\n\t * Additionally, the polyfilled observer uses a timeout to check if observed elements' geometry has changed\n\t * in some other way (dynamic layouts, scrollbars showing up, etc.), so its response can also be asynchronous.\n\t *\n\t * @param {Function} callback A function called when any observed element was resized. Refer to the\n\t * native [`ResizeObserver`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver) API to\n\t * learn more.\n\t */\n\tconstructor( callback ) {\n\t\t/**\n\t\t * A function called when any observed {@link #_elements element} was resized.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Function}\n\t\t */\n\t\tthis._callback = callback;\n\n\t\t/**\n\t\t * DOM elements currently observed by the observer instance.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Set}\n\t\t */\n\t\tthis._elements = new Set();\n\n\t\t/**\n\t\t * Cached DOM {@link #_elements elements} bounding rects to compare to upon the next check.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Map.<HTMLElement,module:utils/dom/rect~Rect>}\n\t\t */\n\t\tthis._previousRects = new Map();\n\n\t\t/**\n\t\t * An UID of the current timeout upon which the observed elements rects\n\t\t * will be compared to the {@link #_previousRects previous rects} from the past.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Map.<HTMLElement,module:utils/dom/rect~Rect>}\n\t\t */\n\t\tthis._periodicCheckTimeout = null;\n\t}\n\n\t/**\n\t * Starts observing a DOM element.\n\t *\n\t * Learn more in the\n\t * [native method documentation](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/observe).\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tobserve( element ) {\n\t\tthis._elements.add( element );\n\n\t\tthis._checkElementRectsAndExecuteCallback();\n\n\t\tif ( this._elements.size === 1 ) {\n\t\t\tthis._startPeriodicCheck();\n\t\t}\n\t}\n\n\t/**\n\t * Stops observing a DOM element.\n\t *\n\t * Learn more in the\n\t * [native method documentation](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/unobserve).\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tunobserve( element ) {\n\t\tthis._elements.delete( element );\n\t\tthis._previousRects.delete( element );\n\n\t\tif ( !this._elements.size ) {\n\t\t\tthis._stopPeriodicCheck();\n\t\t}\n\t}\n\n\t/**\n\t * When called, the observer calls the {@link #_callback resize callback} for all observed\n\t * {@link #_elements elements} but also starts checking periodically for changes in the elements' geometry.\n\t * If some are detected, {@link #_callback resize callback} is called for relevant elements that were resized.\n\t *\n\t * @protected\n\t */\n\t_startPeriodicCheck() {\n\t\tconst periodicCheck = () => {\n\t\t\tthis._checkElementRectsAndExecuteCallback();\n\t\t\tthis._periodicCheckTimeout = setTimeout( periodicCheck, RESIZE_CHECK_INTERVAL );\n\t\t};\n\n\t\tthis.listenTo( global.window, 'resize', () => {\n\t\t\tthis._checkElementRectsAndExecuteCallback();\n\t\t} );\n\n\t\tthis._periodicCheckTimeout = setTimeout( periodicCheck, RESIZE_CHECK_INTERVAL );\n\t}\n\n\t/**\n\t * Stops checking for changes in all observed {@link #_elements elements} geometry.\n\t *\n\t * @protected\n\t */\n\t_stopPeriodicCheck() {\n\t\tclearTimeout( this._periodicCheckTimeout );\n\t\tthis.stopListening();\n\t\tthis._previousRects.clear();\n\t}\n\n\t/**\n\t * Checks if the geometry of any of the {@link #_elements element} has changed. If so, executes\n\t * the {@link #_callback resize callback} with element geometry data.\n\t *\n\t * @protected\n\t */\n\t_checkElementRectsAndExecuteCallback() {\n\t\tconst entries = [];\n\n\t\tfor ( const element of this._elements ) {\n\t\t\tif ( this._hasRectChanged( element ) ) {\n\t\t\t\tentries.push( {\n\t\t\t\t\ttarget: element,\n\t\t\t\t\tcontentRect: this._previousRects.get( element )\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\tif ( entries.length ) {\n\t\t\tthis._callback( entries );\n\t\t}\n\t}\n\n\t/**\n\t * Compares the DOM element geometry to the {@link #_previousRects cached geometry} from the past.\n\t * Returns `true` if geometry has changed or the element is checked for the first time.\n\t *\n\t * @protected\n\t * @param {HTMLElement} element\n\t * @returns {Boolean}\n\t */\n\t_hasRectChanged( element ) {\n\t\tif ( !element.ownerDocument.body.contains( element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst currentRect = new Rect( element );\n\t\tconst previousRect = this._previousRects.get( element );\n\n\t\t// The first check should always yield true despite no Previous rect to compare to.\n\t\t// The native ResizeObserver does that and... that makes sense. Sort of.\n\t\tconst hasChanged = !previousRect || !previousRect.isEqual( currentRect );\n\n\t\tthis._previousRects.set( element, currentRect );\n\n\t\treturn hasChanged;\n\t}\n}\n\nmix( ResizeObserverPolyfill, DomEmitterMixin );\n"],"sourceRoot":""}