documentselection.js 36 KB

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  1. /**
  2. * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
  3. * For licensing, see LICENSE.md.
  4. */
  5. /**
  6. * @module engine/model/documentselection
  7. */
  8. import mix from '@ckeditor/ckeditor5-utils/src/mix';
  9. import EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';
  10. import Selection from './selection';
  11. import Position from './position';
  12. import LiveRange from './liverange';
  13. import Text from './text';
  14. import TextProxy from './textproxy';
  15. import toMap from '@ckeditor/ckeditor5-utils/src/tomap';
  16. import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
  17. import log from '@ckeditor/ckeditor5-utils/src/log';
  18. import uid from '@ckeditor/ckeditor5-utils/src/uid';
  19. const storePrefix = 'selection:';
  20. /**
  21. * `DocumentSelection` is a special selection which is used as the
  22. * {@link module:engine/model/document~Document#selection document's selection}.
  23. * There can be only one instance of `DocumentSelection` per document.
  24. *
  25. * Document selection can only be changed by using the {@link module:engine/model/writer~Writer} instance
  26. * inside the {@link module:engine/model/model~Model#change `change()`} block, as it provides a secure way to modify model.
  27. *
  28. * `DocumentSelection` is automatically updated upon changes in the {@link module:engine/model/document~Document document}
  29. * to always contain valid ranges. Its attributes are inherited from the text unless set explicitly.
  30. *
  31. * Differences between {@link module:engine/model/selection~Selection} and `DocumentSelection` are:
  32. * * there is always a range in `DocumentSelection` - even if no ranges were added there is a "default range"
  33. * present in the selection,
  34. * * ranges added to this selection updates automatically when the document changes,
  35. * * attributes of `DocumentSelection` are updated automatically according to selection ranges.
  36. *
  37. * Since `DocumentSelection` uses {@link module:engine/model/liverange~LiveRange live ranges}
  38. * and is updated when {@link module:engine/model/document~Document document}
  39. * changes, it cannot be set on {@link module:engine/model/node~Node nodes}
  40. * that are inside {@link module:engine/model/documentfragment~DocumentFragment document fragment}.
  41. * If you need to represent a selection in document fragment,
  42. * use {@link module:engine/model/selection~Selection Selection class} instead.
  43. *
  44. * @mixes module:utils/emittermixin~EmitterMixin
  45. */
  46. export default class DocumentSelection {
  47. /**
  48. * Creates an empty live selection for given {@link module:engine/model/document~Document}.
  49. *
  50. * @param {module:engine/model/document~Document} doc Document which owns this selection.
  51. */
  52. constructor( doc ) {
  53. /**
  54. * Selection used internally by that class (`DocumentSelection` is a proxy to that selection).
  55. *
  56. * @protected
  57. */
  58. this._selection = new LiveSelection( doc );
  59. this._selection.delegate( 'change:range' ).to( this );
  60. this._selection.delegate( 'change:attribute' ).to( this );
  61. }
  62. /**
  63. * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is
  64. * collapsed.
  65. *
  66. * @readonly
  67. * @type {Boolean}
  68. */
  69. get isCollapsed() {
  70. return this._selection.isCollapsed;
  71. }
  72. /**
  73. * Selection anchor. Anchor may be described as a position where the most recent part of the selection starts.
  74. * Together with {@link #focus} they define the direction of selection, which is important
  75. * when expanding/shrinking selection. Anchor is always {@link module:engine/model/range~Range#start start} or
  76. * {@link module:engine/model/range~Range#end end} position of the most recently added range.
  77. *
  78. * Is set to `null` if there are no ranges in selection.
  79. *
  80. * @see #focus
  81. * @readonly
  82. * @type {module:engine/model/position~Position|null}
  83. */
  84. get anchor() {
  85. return this._selection.anchor;
  86. }
  87. /**
  88. * Selection focus. Focus is a position where the selection ends.
  89. *
  90. * Is set to `null` if there are no ranges in selection.
  91. *
  92. * @see #anchor
  93. * @readonly
  94. * @type {module:engine/model/position~Position|null}
  95. */
  96. get focus() {
  97. return this._selection.focus;
  98. }
  99. /**
  100. * Returns number of ranges in selection.
  101. *
  102. * @readonly
  103. * @type {Number}
  104. */
  105. get rangeCount() {
  106. return this._selection.rangeCount;
  107. }
  108. /**
  109. * Describes whether `Documentselection` has own range(s) set, or if it is defaulted to
  110. * {@link module:engine/model/document~Document#_getDefaultRange document's default range}.
  111. *
  112. * @readonly
  113. * @type {Boolean}
  114. */
  115. get hasOwnRange() {
  116. return this._selection.hasOwnRange;
  117. }
  118. /**
  119. * Specifies whether the {@link #focus}
  120. * precedes {@link #anchor}.
  121. *
  122. * @readonly
  123. * @type {Boolean}
  124. */
  125. get isBackward() {
  126. return this._selection.isBackward;
  127. }
  128. /**
  129. * Describes whether the gravity is overridden (using {@link module:engine/model/writer~Writer#overrideSelectionGravity}) or not.
  130. *
  131. * Note that the gravity remains overridden as long as will not be restored the same number of times as it was overridden.
  132. *
  133. * @readonly
  134. * @returns {Boolean}
  135. */
  136. get isGravityOverridden() {
  137. return this._selection.isGravityOverridden;
  138. }
  139. /**
  140. * Used for the compatibility with the {@link module:engine/model/selection~Selection#isEqual} method.
  141. *
  142. * @protected
  143. */
  144. get _ranges() {
  145. return this._selection._ranges;
  146. }
  147. /**
  148. * Returns an iterable that iterates over copies of selection ranges.
  149. *
  150. * @returns {Iterable.<module:engine/model/range~Range>}
  151. */
  152. getRanges() {
  153. return this._selection.getRanges();
  154. }
  155. /**
  156. * Returns the first position in the selection.
  157. * First position is the position that {@link module:engine/model/position~Position#isBefore is before}
  158. * any other position in the selection.
  159. *
  160. * Returns `null` if there are no ranges in selection.
  161. *
  162. * @returns {module:engine/model/position~Position|null}
  163. */
  164. getFirstPosition() {
  165. return this._selection.getFirstPosition();
  166. }
  167. /**
  168. * Returns the last position in the selection.
  169. * Last position is the position that {@link module:engine/model/position~Position#isAfter is after}
  170. * any other position in the selection.
  171. *
  172. * Returns `null` if there are no ranges in selection.
  173. *
  174. * @returns {module:engine/model/position~Position|null}
  175. */
  176. getLastPosition() {
  177. return this._selection.getLastPosition();
  178. }
  179. /**
  180. * Returns a copy of the first range in the selection.
  181. * First range is the one which {@link module:engine/model/range~Range#start start} position
  182. * {@link module:engine/model/position~Position#isBefore is before} start position of all other ranges
  183. * (not to confuse with the first range added to the selection).
  184. *
  185. * Returns `null` if there are no ranges in selection.
  186. *
  187. * @returns {module:engine/model/range~Range|null}
  188. */
  189. getFirstRange() {
  190. return this._selection.getFirstRange();
  191. }
  192. /**
  193. * Returns a copy of the last range in the selection.
  194. * Last range is the one which {@link module:engine/model/range~Range#end end} position
  195. * {@link module:engine/model/position~Position#isAfter is after} end position of all other ranges (not to confuse with the range most
  196. * recently added to the selection).
  197. *
  198. * Returns `null` if there are no ranges in selection.
  199. *
  200. * @returns {module:engine/model/range~Range|null}
  201. */
  202. getLastRange() {
  203. return this._selection.getLastRange();
  204. }
  205. /**
  206. * Gets elements of type "block" touched by the selection.
  207. *
  208. * This method's result can be used for example to apply block styling to all blocks covered by this selection.
  209. *
  210. * **Note:** `getSelectedBlocks()` always returns the deepest block.
  211. *
  212. * In this case the function will return exactly all 3 paragraphs:
  213. *
  214. * <paragraph>[a</paragraph>
  215. * <quote>
  216. * <paragraph>b</paragraph>
  217. * </quote>
  218. * <paragraph>c]d</paragraph>
  219. *
  220. * In this case the paragraph will also be returned, despite the collapsed selection:
  221. *
  222. * <paragraph>[]a</paragraph>
  223. *
  224. * **Special case**: If a selection ends at the beginning of a block, that block is not returned as from user perspective
  225. * this block wasn't selected. See [#984](https://github.com/ckeditor/ckeditor5-engine/issues/984) for more details.
  226. *
  227. * <paragraph>[a</paragraph>
  228. * <paragraph>b</paragraph>
  229. * <paragraph>]c</paragraph> // this block will not be returned
  230. *
  231. * @returns {Iterator.<module:engine/model/element~Element>}
  232. */
  233. getSelectedBlocks() {
  234. return this._selection.getSelectedBlocks();
  235. }
  236. /**
  237. * Returns the selected element. {@link module:engine/model/element~Element Element} is considered as selected if there is only
  238. * one range in the selection, and that range contains exactly one element.
  239. * Returns `null` if there is no selected element.
  240. *
  241. * @returns {module:engine/model/element~Element|null}
  242. */
  243. getSelectedElement() {
  244. return this._selection.getSelectedElement();
  245. }
  246. /**
  247. * Checks whether the selection contains the entire content of the given element. This means that selection must start
  248. * at a position {@link module:engine/model/position~Position#isTouching touching} the element's start and ends at position
  249. * touching the element's end.
  250. *
  251. * By default, this method will check whether the entire content of the selection's current root is selected.
  252. * Useful to check if e.g. the user has just pressed <kbd>Ctrl</kbd> + <kbd>A</kbd>.
  253. *
  254. * @param {module:engine/model/element~Element} [element=this.anchor.root]
  255. * @returns {Boolean}
  256. */
  257. containsEntireContent( element ) {
  258. return this._selection.containsEntireContent( element );
  259. }
  260. /**
  261. * Unbinds all events previously bound by document selection.
  262. */
  263. destroy() {
  264. this._selection.destroy();
  265. }
  266. /**
  267. * Returns iterable that iterates over this selection's attribute keys.
  268. *
  269. * @returns {Iterable.<String>}
  270. */
  271. getAttributeKeys() {
  272. return this._selection.getAttributeKeys();
  273. }
  274. /**
  275. * Returns iterable that iterates over this selection's attributes.
  276. *
  277. * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.
  278. * This format is accepted by native `Map` object and also can be passed in `Node` constructor.
  279. *
  280. * @returns {Iterable.<*>}
  281. */
  282. getAttributes() {
  283. return this._selection.getAttributes();
  284. }
  285. /**
  286. * Gets an attribute value for given key or `undefined` if that attribute is not set on the selection.
  287. *
  288. * @param {String} key Key of attribute to look for.
  289. * @returns {*} Attribute value or `undefined`.
  290. */
  291. getAttribute( key ) {
  292. return this._selection.getAttribute( key );
  293. }
  294. /**
  295. * Checks if the selection has an attribute for given key.
  296. *
  297. * @param {String} key Key of attribute to check.
  298. * @returns {Boolean} `true` if attribute with given key is set on selection, `false` otherwise.
  299. */
  300. hasAttribute( key ) {
  301. return this._selection.hasAttribute( key );
  302. }
  303. /**
  304. * Moves {@link module:engine/model/documentselection~DocumentSelection#focus} to the specified location.
  305. * Should be used only within the {@link module:engine/model/writer~Writer#setSelectionFocus} method.
  306. *
  307. * The location can be specified in the same form as {@link module:engine/model/position~Position._createAt} parameters.
  308. *
  309. * @see module:engine/model/writer~Writer#setSelectionFocus
  310. * @protected
  311. * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition
  312. * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when
  313. * first parameter is a {@link module:engine/model/item~Item model item}.
  314. */
  315. _setFocus( itemOrPosition, offset ) {
  316. this._selection.setFocus( itemOrPosition, offset );
  317. }
  318. /**
  319. * Sets this selection's ranges and direction to the specified location based on the given
  320. * {@link module:engine/model/selection~Selection selection}, {@link module:engine/model/position~Position position},
  321. * {@link module:engine/model/node~Node node}, {@link module:engine/model/position~Position position},
  322. * {@link module:engine/model/range~Range range}, an iterable of {@link module:engine/model/range~Range ranges} or null.
  323. * Should be used only within the {@link module:engine/model/writer~Writer#setSelection} method.
  324. *
  325. * @see module:engine/model/writer~Writer#setSelection
  326. * @protected
  327. * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection|
  328. * module:engine/model/position~Position|module:engine/model/node~Node|
  329. * Iterable.<module:engine/model/range~Range>|module:engine/model/range~Range|null} selectable
  330. * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.
  331. * @param {Object} [options]
  332. * @param {Boolean} [options.backward] Sets this selection instance to be backward.
  333. */
  334. _setTo( selectable, placeOrOffset, options ) {
  335. this._selection.setTo( selectable, placeOrOffset, options );
  336. }
  337. /**
  338. * Sets attribute on the selection. If attribute with the same key already is set, it's value is overwritten.
  339. * Should be used only within the {@link module:engine/model/writer~Writer#setSelectionAttribute} method.
  340. *
  341. * @see module:engine/model/writer~Writer#setSelectionAttribute
  342. * @protected
  343. * @param {String} key Key of the attribute to set.
  344. * @param {*} value Attribute value.
  345. */
  346. _setAttribute( key, value ) {
  347. this._selection.setAttribute( key, value );
  348. }
  349. /**
  350. * Removes an attribute with given key from the selection.
  351. * If the given attribute was set on the selection, fires the {@link module:engine/model/selection~Selection#event:change:range}
  352. * event with removed attribute key.
  353. * Should be used only within the {@link module:engine/model/writer~Writer#removeSelectionAttribute} method.
  354. *
  355. * @see module:engine/model/writer~Writer#removeSelectionAttribute
  356. * @protected
  357. * @param {String} key Key of the attribute to remove.
  358. */
  359. _removeAttribute( key ) {
  360. this._selection.removeAttribute( key );
  361. }
  362. /**
  363. * Returns an iterable that iterates through all selection attributes stored in current selection's parent.
  364. *
  365. * @protected
  366. * @returns {Iterable.<*>}
  367. */
  368. _getStoredAttributes() {
  369. return this._selection._getStoredAttributes();
  370. }
  371. /**
  372. * Temporarily changes the gravity of the selection from the left to the right.
  373. *
  374. * The gravity defines from which direction the selection inherits its attributes. If it's the default left
  375. * gravity, the selection (after being moved by the the user) inherits attributes from its left hand side.
  376. * This method allows to temporarily override this behavior by forcing the gravity to the right.
  377. *
  378. * It returns an unique identifier which is required to restore the gravity. It guarantees the symmetry
  379. * of the process.
  380. *
  381. * @see module:engine/model/writer~Writer#overrideSelectionGravity
  382. * @protected
  383. * @returns {String} The unique id which allows restoring the gravity.
  384. */
  385. _overrideGravity() {
  386. return this._selection.overrideGravity();
  387. }
  388. /**
  389. * Restores the {@link ~DocumentSelection#_overrideGravity overridden gravity}.
  390. *
  391. * Restoring the gravity is only possible using the unique identifier returned by
  392. * {@link ~DocumentSelection#_overrideGravity}. Note that the gravity remains overridden as long as won't be restored
  393. * the same number of times it was overridden.
  394. *
  395. * @see module:engine/model/writer~Writer#restoreSelectionGravity
  396. * @protected
  397. * @param {String} uid The unique id returned by {@link #_overrideGravity}.
  398. */
  399. _restoreGravity( uid ) {
  400. this._selection.restoreGravity( uid );
  401. }
  402. /**
  403. * Generates and returns an attribute key for selection attributes store, basing on original attribute key.
  404. *
  405. * @protected
  406. * @param {String} key Attribute key to convert.
  407. * @returns {String} Converted attribute key, applicable for selection store.
  408. */
  409. static _getStoreAttributeKey( key ) {
  410. return storePrefix + key;
  411. }
  412. /**
  413. * Checks whether the given attribute key is an attribute stored on an element.
  414. *
  415. * @protected
  416. * @param {String} key
  417. * @returns {Boolean}
  418. */
  419. static _isStoreAttributeKey( key ) {
  420. return key.startsWith( storePrefix );
  421. }
  422. }
  423. mix( DocumentSelection, EmitterMixin );
  424. /**
  425. * Fired when selection range(s) changed.
  426. *
  427. * @event change:range
  428. * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set
  429. * to `true` which indicates that the selection change was caused by a direct use of selection's API.
  430. * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its position
  431. * was directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was
  432. * changed because the structure of the model has been changed (which means an indirect change).
  433. * The indirect change does not occur in case of normal (detached) selections because they are "static" (as "not live")
  434. * which mean that they are not updated once the document changes.
  435. */
  436. /**
  437. * Fired when selection attribute changed.
  438. *
  439. * @event change:attribute
  440. * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set
  441. * to `true` which indicates that the selection change was caused by a direct use of selection's API.
  442. * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its attributes
  443. * were directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was
  444. * changed in the model and its attributes were refreshed (which means an indirect change).
  445. * The indirect change does not occur in case of normal (detached) selections because they are "static" (as "not live")
  446. * which mean that they are not updated once the document changes.
  447. * @param {Array.<String>} attributeKeys Array containing keys of attributes that changed.
  448. */
  449. // `LiveSelection` is used internally by {@link module:engine/model/documentselection~DocumentSelection} and shouldn't be used directly.
  450. //
  451. // LiveSelection` is automatically updated upon changes in the {@link module:engine/model/document~Document document}
  452. // to always contain valid ranges. Its attributes are inherited from the text unless set explicitly.
  453. //
  454. // Differences between {@link module:engine/model/selection~Selection} and `LiveSelection` are:
  455. // * there is always a range in `LiveSelection` - even if no ranges were added there is a "default range"
  456. // present in the selection,
  457. // * ranges added to this selection updates automatically when the document changes,
  458. // * attributes of `LiveSelection` are updated automatically according to selection ranges.
  459. //
  460. // @extends module:engine/model/selection~Selection
  461. //
  462. class LiveSelection extends Selection {
  463. // Creates an empty live selection for given {@link module:engine/model/document~Document}.
  464. // @param {module:engine/model/document~Document} doc Document which owns this selection.
  465. constructor( doc ) {
  466. super();
  467. // Document which owns this selection.
  468. //
  469. // @protected
  470. // @member {module:engine/model/model~Model}
  471. this._model = doc.model;
  472. // Document which owns this selection.
  473. //
  474. // @protected
  475. // @member {module:engine/model/document~Document}
  476. this._document = doc;
  477. // Keeps mapping of attribute name to priority with which the attribute got modified (added/changed/removed)
  478. // last time. Possible values of priority are: `'low'` and `'normal'`.
  479. //
  480. // Priorities are used by internal `LiveSelection` mechanisms. All attributes set using `LiveSelection`
  481. // attributes API are set with `'normal'` priority.
  482. //
  483. // @private
  484. // @member {Map} module:engine/model/liveselection~LiveSelection#_attributePriority
  485. this._attributePriority = new Map();
  486. // Contains data required to fix ranges which have been moved to the graveyard.
  487. // @private
  488. // @member {Array} module:engine/model/liveselection~LiveSelection#_fixGraveyardRangesData
  489. this._fixGraveyardRangesData = [];
  490. // Flag that informs whether the selection ranges have changed. It is changed on true when `LiveRange#change:range` event is fired.
  491. // @private
  492. // @member {Array} module:engine/model/liveselection~LiveSelection#_hasChangedRange
  493. this._hasChangedRange = false;
  494. // Each overriding gravity adds an UID to the set and each removal removes it.
  495. // Gravity is overridden when there's at least one UID in the set.
  496. // Gravity is restored when the set is empty.
  497. // This is to prevent conflicts when gravity is overridden by more than one feature at the same time.
  498. // @private
  499. // @type {Set}
  500. this._overriddenGravityRegister = new Set();
  501. // Add events that will ensure selection correctness.
  502. this.on( 'change:range', () => {
  503. for ( const range of this.getRanges() ) {
  504. if ( !this._document._validateSelectionRange( range ) ) {
  505. /**
  506. * Range from {@link module:engine/model/documentselection~DocumentSelection document selection}
  507. * starts or ends at incorrect position.
  508. *
  509. * @error document-selection-wrong-position
  510. * @param {module:engine/model/range~Range} range
  511. */
  512. throw new CKEditorError(
  513. 'document-selection-wrong-position: Range from document selection starts or ends at incorrect position.',
  514. { range }
  515. );
  516. }
  517. }
  518. } );
  519. this.listenTo( this._document, 'change', ( evt, batch ) => {
  520. // Update selection's attributes.
  521. this._updateAttributes( false );
  522. // Clear selection attributes from element if no longer empty.
  523. clearAttributesStoredInElement( this._model, batch );
  524. } );
  525. this.listenTo( this._model, 'applyOperation', () => {
  526. while ( this._fixGraveyardRangesData.length ) {
  527. const { liveRange, sourcePosition } = this._fixGraveyardRangesData.shift();
  528. this._fixGraveyardSelection( liveRange, sourcePosition );
  529. }
  530. if ( this._hasChangedRange ) {
  531. this._hasChangedRange = false;
  532. this.fire( 'change:range', { directChange: false } );
  533. }
  534. }, { priority: 'lowest' } );
  535. }
  536. get isCollapsed() {
  537. const length = this._ranges.length;
  538. return length === 0 ? this._document._getDefaultRange().isCollapsed : super.isCollapsed;
  539. }
  540. get anchor() {
  541. return super.anchor || this._document._getDefaultRange().start;
  542. }
  543. get focus() {
  544. return super.focus || this._document._getDefaultRange().end;
  545. }
  546. get rangeCount() {
  547. return this._ranges.length ? this._ranges.length : 1;
  548. }
  549. // Describes whether `LiveSelection` has own range(s) set, or if it is defaulted to
  550. // {@link module:engine/model/document~Document#_getDefaultRange document's default range}.
  551. //
  552. // @readonly
  553. // @type {Boolean}
  554. get hasOwnRange() {
  555. return this._ranges.length > 0;
  556. }
  557. // When set to `true` then selection attributes on node before the caret won't be taken
  558. // into consideration while updating selection attributes.
  559. //
  560. // @protected
  561. // @type {Boolean}
  562. get isGravityOverridden() {
  563. return !!this._overriddenGravityRegister.size;
  564. }
  565. // Unbinds all events previously bound by live selection.
  566. destroy() {
  567. for ( let i = 0; i < this._ranges.length; i++ ) {
  568. this._ranges[ i ].detach();
  569. }
  570. this.stopListening();
  571. }
  572. * getRanges() {
  573. if ( this._ranges.length ) {
  574. yield* super.getRanges();
  575. } else {
  576. yield this._document._getDefaultRange();
  577. }
  578. }
  579. getFirstRange() {
  580. return super.getFirstRange() || this._document._getDefaultRange();
  581. }
  582. getLastRange() {
  583. return super.getLastRange() || this._document._getDefaultRange();
  584. }
  585. setTo( selectable, optionsOrPlaceOrOffset, options ) {
  586. super.setTo( selectable, optionsOrPlaceOrOffset, options );
  587. this._refreshAttributes();
  588. }
  589. setFocus( itemOrPosition, offset ) {
  590. super.setFocus( itemOrPosition, offset );
  591. this._refreshAttributes();
  592. }
  593. setAttribute( key, value ) {
  594. if ( this._setAttribute( key, value ) ) {
  595. // Fire event with exact data.
  596. const attributeKeys = [ key ];
  597. this.fire( 'change:attribute', { attributeKeys, directChange: true } );
  598. }
  599. }
  600. removeAttribute( key ) {
  601. if ( this._removeAttribute( key ) ) {
  602. // Fire event with exact data.
  603. const attributeKeys = [ key ];
  604. this.fire( 'change:attribute', { attributeKeys, directChange: true } );
  605. }
  606. }
  607. overrideGravity() {
  608. const overrideUid = uid();
  609. // Remember that another overriding has been requested. It will need to be removed
  610. // before the gravity is to be restored.
  611. this._overriddenGravityRegister.add( overrideUid );
  612. if ( this._overriddenGravityRegister.size === 1 ) {
  613. this._refreshAttributes();
  614. }
  615. return overrideUid;
  616. }
  617. restoreGravity( uid ) {
  618. if ( !this._overriddenGravityRegister.has( uid ) ) {
  619. /**
  620. * Restoring gravity for an unknown UID is not possible. Make sure you are using a correct
  621. * UID obtained from the {@link module:engine/model/writer~Writer#overrideSelectionGravity} to restore.
  622. *
  623. * @error document-selection-gravity-wrong-restore
  624. * @param {String} uid The unique identifier returned by {@link #overrideGravity}.
  625. */
  626. throw new CKEditorError(
  627. 'document-selection-gravity-wrong-restore: Attempting to restore the selection gravity for an unknown UID.',
  628. { uid }
  629. );
  630. }
  631. this._overriddenGravityRegister.delete( uid );
  632. // Restore gravity only when all overriding have been restored.
  633. if ( !this.isGravityOverridden ) {
  634. this._refreshAttributes();
  635. }
  636. }
  637. // Removes all attributes from the selection and sets attributes according to the surrounding nodes.
  638. _refreshAttributes() {
  639. this._updateAttributes( true );
  640. }
  641. _popRange() {
  642. this._ranges.pop().detach();
  643. }
  644. _pushRange( range ) {
  645. const liveRange = this._prepareRange( range );
  646. // `undefined` is returned when given `range` is in graveyard root.
  647. if ( liveRange ) {
  648. this._ranges.push( liveRange );
  649. }
  650. }
  651. // Prepares given range to be added to selection. Checks if it is correct,
  652. // converts it to {@link module:engine/model/liverange~LiveRange LiveRange}
  653. // and sets listeners listening to the range's change event.
  654. //
  655. // @private
  656. // @param {module:engine/model/range~Range} range
  657. _prepareRange( range ) {
  658. this._checkRange( range );
  659. if ( range.root == this._document.graveyard ) {
  660. /**
  661. * Trying to add a Range that is in the graveyard root. Range rejected.
  662. *
  663. * @warning model-selection-range-in-graveyard
  664. */
  665. log.warn( 'model-selection-range-in-graveyard: Trying to add a Range that is in the graveyard root. Range rejected.' );
  666. return;
  667. }
  668. const liveRange = LiveRange.createFromRange( range );
  669. liveRange.on( 'change:range', ( evt, oldRange, data ) => {
  670. this._hasChangedRange = true;
  671. // If `LiveRange` is in whole moved to the graveyard, save necessary data. It will be fixed on `Model#applyOperation` event.
  672. if ( liveRange.root == this._document.graveyard ) {
  673. this._fixGraveyardRangesData.push( {
  674. liveRange,
  675. sourcePosition: data.deletionPosition
  676. } );
  677. }
  678. } );
  679. return liveRange;
  680. }
  681. // Updates this selection attributes according to its ranges and the {@link module:engine/model/document~Document model document}.
  682. //
  683. // @protected
  684. // @param {Boolean} clearAll
  685. // @fires change:attribute
  686. _updateAttributes( clearAll ) {
  687. const newAttributes = toMap( this._getSurroundingAttributes() );
  688. const oldAttributes = toMap( this.getAttributes() );
  689. if ( clearAll ) {
  690. // If `clearAll` remove all attributes and reset priorities.
  691. this._attributePriority = new Map();
  692. this._attrs = new Map();
  693. } else {
  694. // If not, remove only attributes added with `low` priority.
  695. for ( const [ key, priority ] of this._attributePriority ) {
  696. if ( priority == 'low' ) {
  697. this._attrs.delete( key );
  698. this._attributePriority.delete( key );
  699. }
  700. }
  701. }
  702. this._setAttributesTo( newAttributes );
  703. // Let's evaluate which attributes really changed.
  704. const changed = [];
  705. // First, loop through all attributes that are set on selection right now.
  706. // Check which of them are different than old attributes.
  707. for ( const [ newKey, newValue ] of this.getAttributes() ) {
  708. if ( !oldAttributes.has( newKey ) || oldAttributes.get( newKey ) !== newValue ) {
  709. changed.push( newKey );
  710. }
  711. }
  712. // Then, check which of old attributes got removed.
  713. for ( const [ oldKey ] of oldAttributes ) {
  714. if ( !this.hasAttribute( oldKey ) ) {
  715. changed.push( oldKey );
  716. }
  717. }
  718. // Fire event with exact data (fire only if anything changed).
  719. if ( changed.length > 0 ) {
  720. this.fire( 'change:attribute', { attributeKeys: changed, directChange: false } );
  721. }
  722. }
  723. // Internal method for setting `LiveSelection` attribute. Supports attribute priorities (through `directChange`
  724. // parameter).
  725. //
  726. // @private
  727. // @param {String} key Attribute key.
  728. // @param {*} value Attribute value.
  729. // @param {Boolean} [directChange=true] `true` if the change is caused by `Selection` API, `false` if change
  730. // is caused by `Batch` API.
  731. // @returns {Boolean} Whether value has changed.
  732. _setAttribute( key, value, directChange = true ) {
  733. const priority = directChange ? 'normal' : 'low';
  734. if ( priority == 'low' && this._attributePriority.get( key ) == 'normal' ) {
  735. // Priority too low.
  736. return false;
  737. }
  738. const oldValue = super.getAttribute( key );
  739. // Don't do anything if value has not changed.
  740. if ( oldValue === value ) {
  741. return false;
  742. }
  743. this._attrs.set( key, value );
  744. // Update priorities map.
  745. this._attributePriority.set( key, priority );
  746. return true;
  747. }
  748. // Internal method for removing `LiveSelection` attribute. Supports attribute priorities (through `directChange`
  749. // parameter).
  750. //
  751. // NOTE: Even if attribute is not present in the selection but is provided to this method, it's priority will
  752. // be changed according to `directChange` parameter.
  753. //
  754. // @private
  755. // @param {String} key Attribute key.
  756. // @param {Boolean} [directChange=true] `true` if the change is caused by `Selection` API, `false` if change
  757. // is caused by `Batch` API.
  758. // @returns {Boolean} Whether attribute was removed. May not be true if such attributes didn't exist or the
  759. // existing attribute had higher priority.
  760. _removeAttribute( key, directChange = true ) {
  761. const priority = directChange ? 'normal' : 'low';
  762. if ( priority == 'low' && this._attributePriority.get( key ) == 'normal' ) {
  763. // Priority too low.
  764. return false;
  765. }
  766. // Update priorities map.
  767. this._attributePriority.set( key, priority );
  768. // Don't do anything if value has not changed.
  769. if ( !super.hasAttribute( key ) ) {
  770. return false;
  771. }
  772. this._attrs.delete( key );
  773. return true;
  774. }
  775. // Internal method for setting multiple `LiveSelection` attributes. Supports attribute priorities (through
  776. // `directChange` parameter).
  777. //
  778. // @private
  779. // @param {Map.<String,*>} attrs Iterable object containing attributes to be set.
  780. // @returns {Set.<String>} Changed attribute keys.
  781. _setAttributesTo( attrs ) {
  782. const changed = new Set();
  783. for ( const [ oldKey, oldValue ] of this.getAttributes() ) {
  784. // Do not remove attribute if attribute with same key and value is about to be set.
  785. if ( attrs.get( oldKey ) === oldValue ) {
  786. continue;
  787. }
  788. // All rest attributes will be removed so changed attributes won't change .
  789. this._removeAttribute( oldKey, false );
  790. }
  791. for ( const [ key, value ] of attrs ) {
  792. // Attribute may not be set because of attributes or because same key/value is already added.
  793. const gotAdded = this._setAttribute( key, value, false );
  794. if ( gotAdded ) {
  795. changed.add( key );
  796. }
  797. }
  798. return changed;
  799. }
  800. // Returns an iterable that iterates through all selection attributes stored in current selection's parent.
  801. //
  802. // @protected
  803. // @returns {Iterable.<*>}
  804. * _getStoredAttributes() {
  805. const selectionParent = this.getFirstPosition().parent;
  806. if ( this.isCollapsed && selectionParent.isEmpty ) {
  807. for ( const key of selectionParent.getAttributeKeys() ) {
  808. if ( key.startsWith( storePrefix ) ) {
  809. const realKey = key.substr( storePrefix.length );
  810. yield [ realKey, selectionParent.getAttribute( key ) ];
  811. }
  812. }
  813. }
  814. }
  815. // Checks model text nodes that are closest to the selection's first position and returns attributes of first
  816. // found element. If there are no text nodes in selection's first position parent, it returns selection
  817. // attributes stored in that parent.
  818. //
  819. // @private
  820. // @returns {Iterable.<*>} Collection of attributes.
  821. _getSurroundingAttributes() {
  822. const position = this.getFirstPosition();
  823. const schema = this._model.schema;
  824. let attrs = null;
  825. if ( !this.isCollapsed ) {
  826. // 1. If selection is a range...
  827. const range = this.getFirstRange();
  828. // ...look for a first character node in that range and take attributes from it.
  829. for ( const value of range ) {
  830. // If the item is an object, we don't want to get attributes from its children.
  831. if ( value.item.is( 'element' ) && schema.isObject( value.item ) ) {
  832. break;
  833. }
  834. // This is not an optimal solution because of https://github.com/ckeditor/ckeditor5-engine/issues/454.
  835. // It can be done better by using `break;` instead of checking `attrs === null`.
  836. if ( value.type == 'text' && attrs === null ) {
  837. attrs = value.item.getAttributes();
  838. }
  839. }
  840. } else {
  841. // 2. If the selection is a caret or the range does not contain a character node...
  842. const nodeBefore = position.textNode ? position.textNode : position.nodeBefore;
  843. const nodeAfter = position.textNode ? position.textNode : position.nodeAfter;
  844. // When gravity is overridden then don't take node before into consideration.
  845. if ( !this.isGravityOverridden ) {
  846. // ...look at the node before caret and take attributes from it if it is a character node.
  847. attrs = getAttrsIfCharacter( nodeBefore );
  848. }
  849. // 3. If not, look at the node after caret...
  850. if ( !attrs ) {
  851. attrs = getAttrsIfCharacter( nodeAfter );
  852. }
  853. // 4. If not, try to find the first character on the left, that is in the same node.
  854. // When gravity is overridden then don't take node before into consideration.
  855. if ( !this.isGravityOverridden && !attrs ) {
  856. let node = nodeBefore;
  857. while ( node && !attrs ) {
  858. node = node.previousSibling;
  859. attrs = getAttrsIfCharacter( node );
  860. }
  861. }
  862. // 5. If not found, try to find the first character on the right, that is in the same node.
  863. if ( !attrs ) {
  864. let node = nodeAfter;
  865. while ( node && !attrs ) {
  866. node = node.nextSibling;
  867. attrs = getAttrsIfCharacter( node );
  868. }
  869. }
  870. // 6. If not found, selection should retrieve attributes from parent.
  871. if ( !attrs ) {
  872. attrs = this._getStoredAttributes();
  873. }
  874. }
  875. return attrs;
  876. }
  877. // Fixes a selection range after it ends up in graveyard root.
  878. //
  879. // @private
  880. // @param {module:engine/model/liverange~LiveRange} liveRange The range from selection, that ended up in the graveyard root.
  881. // @param {module:engine/model/position~Position} removedRangeStart Start position of a range which was removed.
  882. _fixGraveyardSelection( liveRange, removedRangeStart ) {
  883. // The start of the removed range is the closest position to the `liveRange` - the original selection range.
  884. // This is a good candidate for a fixed selection range.
  885. const positionCandidate = Position._createAt( removedRangeStart );
  886. // Find a range that is a correct selection range and is closest to the start of removed range.
  887. const selectionRange = this._model.schema.getNearestSelectionRange( positionCandidate );
  888. // Remove the old selection range before preparing and adding new selection range. This order is important,
  889. // because new range, in some cases, may intersect with old range (it depends on `getNearestSelectionRange()` result).
  890. const index = this._ranges.indexOf( liveRange );
  891. this._ranges.splice( index, 1 );
  892. liveRange.detach();
  893. // If nearest valid selection range has been found - add it in the place of old range.
  894. if ( selectionRange ) {
  895. // Check the range, convert it to live range, bind events, etc.
  896. const newRange = this._prepareRange( selectionRange );
  897. // Add new range in the place of old range.
  898. this._ranges.splice( index, 0, newRange );
  899. }
  900. // If nearest valid selection range cannot be found - just removing the old range is fine.
  901. }
  902. }
  903. // Helper function for {@link module:engine/model/liveselection~LiveSelection#_updateAttributes}.
  904. //
  905. // It takes model item, checks whether it is a text node (or text proxy) and, if so, returns it's attributes. If not, returns `null`.
  906. //
  907. // @param {module:engine/model/item~Item|null} node
  908. // @returns {Boolean}
  909. function getAttrsIfCharacter( node ) {
  910. if ( node instanceof TextProxy || node instanceof Text ) {
  911. return node.getAttributes();
  912. }
  913. return null;
  914. }
  915. // Removes selection attributes from element which is not empty anymore.
  916. //
  917. // @private
  918. // @param {module:engine/model/model~Model} model
  919. // @param {module:engine/model/batch~Batch} batch
  920. function clearAttributesStoredInElement( model, batch ) {
  921. const differ = model.document.differ;
  922. for ( const entry of differ.getChanges() ) {
  923. if ( entry.type != 'insert' ) {
  924. continue;
  925. }
  926. const changeParent = entry.position.parent;
  927. const isNoLongerEmpty = entry.length === changeParent.maxOffset;
  928. if ( isNoLongerEmpty ) {
  929. model.enqueueChange( batch, writer => {
  930. const storedAttributes = Array.from( changeParent.getAttributeKeys() )
  931. .filter( key => key.startsWith( storePrefix ) );
  932. for ( const key of storedAttributes ) {
  933. writer.removeAttribute( key, changeParent );
  934. }
  935. } );
  936. }
  937. }
  938. }