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scroll.js 19 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. /* global window, document, Text */
  6. import testUtils from '@ckeditor/ckeditor5-core/tests/_utils/utils';
  7. import isRange from '../../src/dom/isrange';
  8. import { scrollViewportToShowTarget, scrollAncestorsToShowTarget } from '../../src/dom/scroll';
  9. testUtils.createSinonSandbox();
  10. describe( 'scrollAncestorsToShowTarget()', () => {
  11. let target, element, firstAncestor, secondAncestor;
  12. beforeEach( () => {
  13. element = document.createElement( 'p' );
  14. firstAncestor = document.createElement( 'blockquote' );
  15. secondAncestor = document.createElement( 'div' );
  16. document.body.appendChild( secondAncestor );
  17. secondAncestor.appendChild( firstAncestor );
  18. firstAncestor.appendChild( element );
  19. // Make the element immune to the border-width-* styles in the test environment.
  20. testUtils.sinon.stub( window, 'getComputedStyle' ).returns( {
  21. borderTopWidth: '0px',
  22. borderRightWidth: '0px',
  23. borderBottomWidth: '0px',
  24. borderLeftWidth: '0px'
  25. } );
  26. stubRect( firstAncestor, {
  27. top: 0, right: 100, bottom: 100, left: 0, width: 100, height: 100
  28. }, {
  29. scrollLeft: 100, scrollTop: 100
  30. } );
  31. stubRect( secondAncestor, {
  32. top: -100, right: 0, bottom: 0, left: -100, width: 100, height: 100
  33. }, {
  34. scrollLeft: 100, scrollTop: 100
  35. } );
  36. stubRect( document.body, {
  37. top: 1000, right: 2000, bottom: 1000, left: 1000, width: 1000, height: 1000
  38. }, {
  39. scrollLeft: 1000, scrollTop: 1000
  40. } );
  41. } );
  42. afterEach( () => {
  43. secondAncestor.remove();
  44. } );
  45. describe( 'for an HTMLElement', () => {
  46. beforeEach( () => {
  47. target = element;
  48. } );
  49. test();
  50. } );
  51. describe( 'for a DOM Range', () => {
  52. beforeEach( () => {
  53. target = document.createRange();
  54. target.setStart( firstAncestor, 0 );
  55. target.setEnd( firstAncestor, 0 );
  56. } );
  57. test();
  58. it( 'should set #scrollTop and #scrollLeft of the ancestor to show the target (above, attached to the Text)', () => {
  59. const text = new Text( 'foo' );
  60. firstAncestor.appendChild( text );
  61. target.setStart( text, 1 );
  62. target.setEnd( text, 2 );
  63. stubRect( target, { top: -100, right: 75, bottom: 0, left: 25, width: 50, height: 100 } );
  64. scrollAncestorsToShowTarget( target );
  65. assertScrollPosition( firstAncestor, { scrollTop: 0, scrollLeft: 100 } );
  66. } );
  67. } );
  68. function test() {
  69. it( 'should not touch the #scrollTop #scrollLeft of the ancestor if target is visible', () => {
  70. stubRect( target, { top: 25, right: 75, bottom: 75, left: 25, width: 50, height: 50 } );
  71. scrollAncestorsToShowTarget( target );
  72. assertScrollPosition( firstAncestor, { scrollLeft: 100, scrollTop: 100 } );
  73. } );
  74. it( 'should not touch the #scrollTop #scrollLeft of the document.body', () => {
  75. stubRect( target, { top: 25, right: 75, bottom: 75, left: 25, width: 50, height: 50 } );
  76. scrollAncestorsToShowTarget( target );
  77. assertScrollPosition( document.body, { scrollLeft: 1000, scrollTop: 1000 } );
  78. } );
  79. it( 'should set #scrollTop and #scrollLeft of the ancestor to show the target (above)', () => {
  80. stubRect( target, { top: -100, right: 75, bottom: 0, left: 25, width: 50, height: 100 } );
  81. scrollAncestorsToShowTarget( target );
  82. assertScrollPosition( firstAncestor, { scrollTop: 0, scrollLeft: 100 } );
  83. } );
  84. it( 'should set #scrollTop and #scrollLeft of the ancestor to show the target (below)', () => {
  85. stubRect( target, { top: 200, right: 75, bottom: 300, left: 25, width: 50, height: 100 } );
  86. scrollAncestorsToShowTarget( target );
  87. assertScrollPosition( firstAncestor, { scrollTop: 300, scrollLeft: 100 } );
  88. } );
  89. it( 'should set #scrollTop and #scrollLeft of the ancestor to show the target (left of)', () => {
  90. stubRect( target, { top: 0, right: 0, bottom: 100, left: -100, width: 100, height: 100 } );
  91. scrollAncestorsToShowTarget( target );
  92. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 0 } );
  93. } );
  94. it( 'should set #scrollTop and #scrollLeft of the ancestor to show the target (right of)', () => {
  95. stubRect( target, { top: 0, right: 200, bottom: 100, left: 100, width: 100, height: 100 } );
  96. scrollAncestorsToShowTarget( target );
  97. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 200 } );
  98. } );
  99. it( 'should set #scrollTop and #scrollLeft of all the ancestors', () => {
  100. stubRect( target, { top: 0, right: 200, bottom: 100, left: 100, width: 100, height: 100 } );
  101. scrollAncestorsToShowTarget( target );
  102. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 200 } );
  103. // Note: Because everything is a mock, scrolling the firstAncestor doesn't really change
  104. // the getBoundingClientRect geometry of the target. That's why scrolling secondAncestor
  105. // works like the target remained in the original position and hence scrollLeft is 300 instead
  106. // of 200.
  107. assertScrollPosition( secondAncestor, { scrollTop: 200, scrollLeft: 300 } );
  108. } );
  109. }
  110. } );
  111. describe( 'scrollViewportToShowTarget()', () => {
  112. let target, firstAncestor, element;
  113. const viewportOffset = 30;
  114. beforeEach( () => {
  115. element = document.createElement( 'p' );
  116. firstAncestor = document.createElement( 'blockquote' );
  117. document.body.appendChild( firstAncestor );
  118. firstAncestor.appendChild( element );
  119. stubRect( firstAncestor, {
  120. top: 0, right: 100, bottom: 100, left: 0, width: 100, height: 100
  121. }, {
  122. scrollLeft: 100, scrollTop: 100
  123. } );
  124. testUtils.sinon.stub( window, 'innerWidth' ).value( 1000 );
  125. testUtils.sinon.stub( window, 'innerHeight' ).value( 500 );
  126. testUtils.sinon.stub( window, 'scrollX' ).value( 100 );
  127. testUtils.sinon.stub( window, 'scrollY' ).value( 100 );
  128. testUtils.sinon.stub( window, 'scrollTo' );
  129. testUtils.sinon.stub( window, 'getComputedStyle' ).returns( {
  130. borderTopWidth: '0px',
  131. borderRightWidth: '0px',
  132. borderBottomWidth: '0px',
  133. borderLeftWidth: '0px'
  134. } );
  135. // Assuming 20px v- and h-scrollbars here.
  136. testUtils.sinon.stub( window.document, 'documentElement' ).value( {
  137. clientWidth: 980,
  138. clientHeight: 480
  139. } );
  140. } );
  141. afterEach( () => {
  142. firstAncestor.remove();
  143. } );
  144. describe( 'for an HTMLElement', () => {
  145. beforeEach( () => {
  146. target = element;
  147. } );
  148. testNoOffset();
  149. describe( 'with a viewportOffset', () => {
  150. testWithOffset();
  151. } );
  152. } );
  153. describe( 'for a DOM Range', () => {
  154. beforeEach( () => {
  155. target = document.createRange();
  156. target.setStart( firstAncestor, 0 );
  157. target.setEnd( firstAncestor, 0 );
  158. } );
  159. testNoOffset();
  160. describe( 'with a viewportOffset', () => {
  161. testWithOffset();
  162. } );
  163. } );
  164. describe( 'in an iframe', () => {
  165. let iframe, iframeWindow, iframeAncestor, target, targetAncestor;
  166. beforeEach( done => {
  167. iframe = document.createElement( 'iframe' );
  168. iframeAncestor = document.createElement( 'div' );
  169. iframe.addEventListener( 'load', () => {
  170. iframeWindow = iframe.contentWindow;
  171. testUtils.sinon.stub( iframeWindow, 'innerWidth' ).value( 1000 );
  172. testUtils.sinon.stub( iframeWindow, 'innerHeight' ).value( 500 );
  173. testUtils.sinon.stub( iframeWindow, 'scrollX' ).value( 100 );
  174. testUtils.sinon.stub( iframeWindow, 'scrollY' ).value( 100 );
  175. testUtils.sinon.stub( iframeWindow, 'scrollTo' );
  176. testUtils.sinon.stub( iframeWindow, 'getComputedStyle' ).returns( {
  177. borderTopWidth: '0px',
  178. borderRightWidth: '0px',
  179. borderBottomWidth: '0px',
  180. borderLeftWidth: '0px'
  181. } );
  182. // Assuming 20px v- and h-scrollbars here.
  183. testUtils.sinon.stub( iframeWindow.document, 'documentElement' ).value( {
  184. clientWidth: 980,
  185. clientHeight: 480
  186. } );
  187. target = iframeWindow.document.createElement( 'p' );
  188. targetAncestor = iframeWindow.document.createElement( 'div' );
  189. iframeWindow.document.body.appendChild( targetAncestor );
  190. targetAncestor.appendChild( target );
  191. done();
  192. } );
  193. iframeAncestor.appendChild( iframe );
  194. document.body.appendChild( iframeAncestor );
  195. } );
  196. afterEach( () => {
  197. // Safari fails because of "afterEach()" hook tries to restore values from removed element.
  198. // We need to restore these values manually.
  199. testUtils.sinon.restore();
  200. iframeAncestor.remove();
  201. } );
  202. it( 'does not scroll the viewport when the target is fully visible', () => {
  203. stubRect( target,
  204. { top: 100, right: 200, bottom: 200, left: 100, width: 100, height: 100 } );
  205. stubRect( targetAncestor,
  206. { top: 100, right: 300, bottom: 400, left: 0, width: 300, height: 300 },
  207. { scrollLeft: 200, scrollTop: -100 } );
  208. stubRect( iframe,
  209. { top: 200, right: 400, bottom: 400, left: 200, width: 200, height: 200 } );
  210. stubRect( iframeAncestor,
  211. { top: 0, right: 400, bottom: 400, left: 0, width: 400, height: 400 },
  212. { scrollLeft: 100, scrollTop: 100 } );
  213. scrollViewportToShowTarget( { target } );
  214. assertScrollPosition( targetAncestor, { scrollLeft: 200, scrollTop: -100 } );
  215. assertScrollPosition( iframeAncestor, { scrollTop: 100, scrollLeft: 100 } );
  216. sinon.assert.notCalled( iframeWindow.scrollTo );
  217. sinon.assert.notCalled( window.scrollTo );
  218. } );
  219. it( 'scrolls the viewport to show the target (above)', () => {
  220. stubRect( target,
  221. { top: -200, right: 200, bottom: -100, left: 100, width: 100, height: 100 } );
  222. stubRect( targetAncestor,
  223. { top: 200, right: 300, bottom: 400, left: 0, width: 300, height: 100 },
  224. { scrollLeft: 200, scrollTop: -100 } );
  225. stubRect( iframe,
  226. { top: 2000, right: 2000, bottom: 2500, left: 2500, width: 500, height: 500 } );
  227. stubRect( iframeAncestor,
  228. { top: 0, right: 100, bottom: 100, left: 0, width: 100, height: 100 },
  229. { scrollLeft: 100, scrollTop: 100 } );
  230. scrollViewportToShowTarget( { target } );
  231. assertScrollPosition( targetAncestor, { scrollTop: -500, scrollLeft: 200 } );
  232. assertScrollPosition( iframeAncestor, { scrollTop: 1900, scrollLeft: 2700 } );
  233. sinon.assert.calledWithExactly( iframeWindow.scrollTo, 100, -100 );
  234. sinon.assert.calledWithExactly( window.scrollTo, 1820, 1520 );
  235. } );
  236. // https://github.com/ckeditor/ckeditor5/issues/930
  237. it( 'should not throw if the child frame has no access to the #frameElement of the parent', () => {
  238. sinon.stub( iframeWindow, 'frameElement' ).get( () => null );
  239. expect( () => {
  240. scrollViewportToShowTarget( { target } );
  241. } ).to.not.throw();
  242. } );
  243. } );
  244. // Note: Because everything is a mock, scrolling the firstAncestor doesn't really change
  245. // the getBoundingClientRect geometry of the target. That's why scrolling the viewport
  246. // works like the target remained in the original position. It's tricky but much faster
  247. // and still shows that the whole thing works as expected.
  248. //
  249. // Note: Negative scrollTo arguments make no sense in reality, but in mocks with arbitrary
  250. // initial geometry and scroll position they give the right, relative picture of what's going on.
  251. function testNoOffset() {
  252. it( 'does not scroll the viewport when the target is fully visible', () => {
  253. stubRect( target, { top: 0, right: 200, bottom: 100, left: 100, width: 100, height: 100 } );
  254. scrollViewportToShowTarget( { target } );
  255. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 200 } );
  256. sinon.assert.notCalled( window.scrollTo );
  257. } );
  258. it( 'scrolls the viewport to show the target (above)', () => {
  259. stubRect( target, { top: -200, right: 200, bottom: -100, left: 100, width: 100, height: 100 } );
  260. scrollViewportToShowTarget( { target } );
  261. assertScrollPosition( firstAncestor, { scrollTop: -100, scrollLeft: 200 } );
  262. sinon.assert.calledWithExactly( window.scrollTo, 100, -100 );
  263. } );
  264. it( 'scrolls the viewport to show the target (partially above)', () => {
  265. stubRect( target, { top: -50, right: 200, bottom: 50, left: 100, width: 100, height: 100 } );
  266. scrollViewportToShowTarget( { target } );
  267. assertScrollPosition( firstAncestor, { scrollTop: 50, scrollLeft: 200 } );
  268. sinon.assert.calledWithExactly( window.scrollTo, 100, 50 );
  269. } );
  270. it( 'scrolls the viewport to show the target (below)', () => {
  271. stubRect( target, { top: 600, right: 200, bottom: 700, left: 100, width: 100, height: 100 } );
  272. scrollViewportToShowTarget( { target } );
  273. assertScrollPosition( firstAncestor, { scrollTop: 700, scrollLeft: 200 } );
  274. sinon.assert.calledWithExactly( window.scrollTo, 100, 320 );
  275. } );
  276. it( 'scrolls the viewport to show the target (partially below)', () => {
  277. stubRect( target, { top: 450, right: 200, bottom: 550, left: 100, width: 100, height: 100 } );
  278. scrollViewportToShowTarget( { target } );
  279. assertScrollPosition( firstAncestor, { scrollTop: 550, scrollLeft: 200 } );
  280. sinon.assert.calledWithExactly( window.scrollTo, 100, 170 );
  281. } );
  282. it( 'scrolls the viewport to show the target (to the left)', () => {
  283. stubRect( target, { top: 0, right: -100, bottom: 100, left: -200, width: 100, height: 100 } );
  284. scrollViewportToShowTarget( { target } );
  285. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: -100 } );
  286. sinon.assert.calledWithExactly( window.scrollTo, -100, 100 );
  287. } );
  288. it( 'scrolls the viewport to show the target (partially to the left)', () => {
  289. stubRect( target, { top: 0, right: 50, bottom: 100, left: -50, width: 100, height: 100 } );
  290. scrollViewportToShowTarget( { target } );
  291. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 50 } );
  292. sinon.assert.calledWithExactly( window.scrollTo, 50, 100 );
  293. } );
  294. it( 'scrolls the viewport to show the target (to the right)', () => {
  295. stubRect( target, { top: 0, right: 1200, bottom: 100, left: 1100, width: 100, height: 100 } );
  296. scrollViewportToShowTarget( { target } );
  297. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1200 } );
  298. sinon.assert.calledWithExactly( window.scrollTo, 320, 100 );
  299. } );
  300. it( 'scrolls the viewport to show the target (partially to the right)', () => {
  301. stubRect( target, { top: 0, right: 1050, bottom: 100, left: 950, width: 100, height: 100 } );
  302. scrollViewportToShowTarget( { target } );
  303. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1050 } );
  304. sinon.assert.calledWithExactly( window.scrollTo, 170, 100 );
  305. } );
  306. }
  307. // Note: Because everything is a mock, scrolling the firstAncestor doesn't really change
  308. // the getBoundingClientRect geometry of the target. That's why scrolling the viewport
  309. // works like the target remained in the original position. It's tricky but much faster
  310. // and still shows that the whole thing works as expected.
  311. //
  312. // Note: Negative scrollTo arguments make no sense in reality, but in mocks with arbitrary
  313. // initial geometry and scroll position they give the right, relative picture of what's going on.
  314. function testWithOffset() {
  315. it( 'does not scroll the viewport when the target is fully visible', () => {
  316. stubRect( target, { top: 50, right: 200, bottom: 150, left: 100, width: 100, height: 100 } );
  317. scrollViewportToShowTarget( { target, viewportOffset } );
  318. assertScrollPosition( firstAncestor, { scrollTop: 150, scrollLeft: 200 } );
  319. sinon.assert.notCalled( window.scrollTo );
  320. } );
  321. it( 'scrolls the viewport to show the target (above)', () => {
  322. stubRect( target, { top: -200, right: 200, bottom: -100, left: 100, width: 100, height: 100 } );
  323. scrollViewportToShowTarget( { target, viewportOffset } );
  324. assertScrollPosition( firstAncestor, { scrollTop: -100, scrollLeft: 200 } );
  325. sinon.assert.calledWithExactly( window.scrollTo, 100, -130 );
  326. } );
  327. it( 'scrolls the viewport to show the target (partially above)', () => {
  328. stubRect( target, { top: -50, right: 200, bottom: 50, left: 100, width: 100, height: 100 } );
  329. scrollViewportToShowTarget( { target, viewportOffset } );
  330. assertScrollPosition( firstAncestor, { scrollTop: 50, scrollLeft: 200 } );
  331. sinon.assert.calledWithExactly( window.scrollTo, 100, 20 );
  332. } );
  333. it( 'scrolls the viewport to show the target (below)', () => {
  334. stubRect( target, { top: 600, right: 200, bottom: 700, left: 100, width: 100, height: 100 } );
  335. scrollViewportToShowTarget( { target, viewportOffset } );
  336. assertScrollPosition( firstAncestor, { scrollTop: 700, scrollLeft: 200 } );
  337. sinon.assert.calledWithExactly( window.scrollTo, 100, 350 );
  338. } );
  339. it( 'scrolls the viewport to show the target (partially below)', () => {
  340. stubRect( target, { top: 450, right: 200, bottom: 550, left: 100, width: 100, height: 100 } );
  341. scrollViewportToShowTarget( { target, viewportOffset } );
  342. assertScrollPosition( firstAncestor, { scrollTop: 550, scrollLeft: 200 } );
  343. sinon.assert.calledWithExactly( window.scrollTo, 100, 200 );
  344. } );
  345. it( 'scrolls the viewport to show the target (to the left)', () => {
  346. stubRect( target, { top: 0, right: -100, bottom: 100, left: -200, width: 100, height: 100 } );
  347. scrollViewportToShowTarget( { target, viewportOffset } );
  348. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: -100 } );
  349. sinon.assert.calledWithExactly( window.scrollTo, -130, 70 );
  350. } );
  351. it( 'scrolls the viewport to show the target (partially to the left)', () => {
  352. stubRect( target, { top: 0, right: 50, bottom: 100, left: -50, width: 100, height: 100 } );
  353. scrollViewportToShowTarget( { target, viewportOffset } );
  354. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 50 } );
  355. sinon.assert.calledWithExactly( window.scrollTo, 20, 70 );
  356. } );
  357. it( 'scrolls the viewport to show the target (to the right)', () => {
  358. stubRect( target, { top: 0, right: 1200, bottom: 100, left: 1100, width: 100, height: 100 } );
  359. scrollViewportToShowTarget( { target, viewportOffset } );
  360. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1200 } );
  361. sinon.assert.calledWithExactly( window.scrollTo, 350, 70 );
  362. } );
  363. it( 'scrolls the viewport to show the target (partially to the right)', () => {
  364. stubRect( target, { top: 0, right: 1050, bottom: 100, left: 950, width: 100, height: 100 } );
  365. scrollViewportToShowTarget( { target, viewportOffset } );
  366. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1050 } );
  367. sinon.assert.calledWithExactly( window.scrollTo, 200, 70 );
  368. } );
  369. }
  370. } );
  371. function stubRect( target, geometryStub, scrollStub ) {
  372. if ( isRange( target ) ) {
  373. testUtils.sinon.stub( target, 'getClientRects' ).returns( [ geometryStub ] );
  374. } else {
  375. testUtils.sinon.stub( target, 'getBoundingClientRect' ).returns( geometryStub );
  376. // Make the element immune to the border-width-* styles in the test environment.
  377. Object.defineProperties( target, {
  378. offsetWidth: {
  379. value: geometryStub.width
  380. },
  381. clientWidth: {
  382. value: geometryStub.width
  383. },
  384. offsetHeight: {
  385. value: geometryStub.height
  386. },
  387. clientHeight: {
  388. value: geometryStub.height
  389. }
  390. } );
  391. }
  392. if ( scrollStub ) {
  393. let { scrollLeft, scrollTop } = scrollStub;
  394. // There's no way to stub scrollLeft|Top with Sinon. defineProperties
  395. // must be used instead.
  396. Object.defineProperties( target, {
  397. scrollLeft: {
  398. get() {
  399. return scrollLeft;
  400. },
  401. set( value ) {
  402. scrollLeft = value;
  403. },
  404. configurable: true
  405. },
  406. scrollTop: {
  407. get() {
  408. return scrollTop;
  409. },
  410. set( value ) {
  411. scrollTop = value;
  412. },
  413. configurable: true
  414. }
  415. } );
  416. }
  417. }
  418. function assertScrollPosition( element, expected ) {
  419. expect( element.scrollTop ).to.equal( expected.scrollTop, 'scrollTop' );
  420. expect( element.scrollLeft ).to.equal( expected.scrollLeft, 'scrollLeft' );
  421. }