scroll.js 15 KB

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  1. /**
  2. * @license Copyright (c) 2003-2017, 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. // Note: Because everything is a mock, scrolling the firstAncestor doesn't really change
  165. // the getBoundingClientRect geometry of the target. That's why scrolling the viewport
  166. // works like the target remained in the original position. It's tricky but much faster
  167. // and still shows that the whole thing works as expected.
  168. //
  169. // Note: Negative scrollTo arguments make no sense in reality, but in mocks with arbitrary
  170. // initial geometry and scroll position they give the right, relative picture of what's going on.
  171. function testNoOffset() {
  172. it( 'does not scroll the viewport when the target is fully visible', () => {
  173. stubRect( target, { top: 0, right: 200, bottom: 100, left: 100, width: 100, height: 100 } );
  174. scrollViewportToShowTarget( { target } );
  175. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 200 } );
  176. sinon.assert.notCalled( window.scrollTo );
  177. } );
  178. it( 'scrolls the viewport to show the target (above)', () => {
  179. stubRect( target, { top: -200, right: 200, bottom: -100, left: 100, width: 100, height: 100 } );
  180. scrollViewportToShowTarget( { target } );
  181. assertScrollPosition( firstAncestor, { scrollTop: -100, scrollLeft: 200 } );
  182. sinon.assert.calledWithExactly( window.scrollTo, 100, -100 );
  183. } );
  184. it( 'scrolls the viewport to show the target (partially above)', () => {
  185. stubRect( target, { top: -50, right: 200, bottom: 50, left: 100, width: 100, height: 100 } );
  186. scrollViewportToShowTarget( { target } );
  187. assertScrollPosition( firstAncestor, { scrollTop: 50, scrollLeft: 200 } );
  188. sinon.assert.calledWithExactly( window.scrollTo, 100, 50 );
  189. } );
  190. it( 'scrolls the viewport to show the target (below)', () => {
  191. stubRect( target, { top: 600, right: 200, bottom: 700, left: 100, width: 100, height: 100 } );
  192. scrollViewportToShowTarget( { target } );
  193. assertScrollPosition( firstAncestor, { scrollTop: 700, scrollLeft: 200 } );
  194. sinon.assert.calledWithExactly( window.scrollTo, 100, 320 );
  195. } );
  196. it( 'scrolls the viewport to show the target (partially below)', () => {
  197. stubRect( target, { top: 450, right: 200, bottom: 550, left: 100, width: 100, height: 100 } );
  198. scrollViewportToShowTarget( { target } );
  199. assertScrollPosition( firstAncestor, { scrollTop: 550, scrollLeft: 200 } );
  200. sinon.assert.calledWithExactly( window.scrollTo, 100, 170 );
  201. } );
  202. it( 'scrolls the viewport to show the target (to the left)', () => {
  203. stubRect( target, { top: 0, right: -100, bottom: 100, left: -200, width: 100, height: 100 } );
  204. scrollViewportToShowTarget( { target } );
  205. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: -100 } );
  206. sinon.assert.calledWithExactly( window.scrollTo, -100, 100 );
  207. } );
  208. it( 'scrolls the viewport to show the target (partially to the left)', () => {
  209. stubRect( target, { top: 0, right: 50, bottom: 100, left: -50, width: 100, height: 100 } );
  210. scrollViewportToShowTarget( { target } );
  211. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 50 } );
  212. sinon.assert.calledWithExactly( window.scrollTo, 50, 100 );
  213. } );
  214. it( 'scrolls the viewport to show the target (to the right)', () => {
  215. stubRect( target, { top: 0, right: 1200, bottom: 100, left: 1100, width: 100, height: 100 } );
  216. scrollViewportToShowTarget( { target } );
  217. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1200 } );
  218. sinon.assert.calledWithExactly( window.scrollTo, 320, 100 );
  219. } );
  220. it( 'scrolls the viewport to show the target (partially to the right)', () => {
  221. stubRect( target, { top: 0, right: 1050, bottom: 100, left: 950, width: 100, height: 100 } );
  222. scrollViewportToShowTarget( { target } );
  223. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1050 } );
  224. sinon.assert.calledWithExactly( window.scrollTo, 170, 100 );
  225. } );
  226. }
  227. // Note: Because everything is a mock, scrolling the firstAncestor doesn't really change
  228. // the getBoundingClientRect geometry of the target. That's why scrolling the viewport
  229. // works like the target remained in the original position. It's tricky but much faster
  230. // and still shows that the whole thing works as expected.
  231. //
  232. // Note: Negative scrollTo arguments make no sense in reality, but in mocks with arbitrary
  233. // initial geometry and scroll position they give the right, relative picture of what's going on.
  234. function testWithOffset() {
  235. it( 'does not scroll the viewport when the target is fully visible', () => {
  236. stubRect( target, { top: 50, right: 200, bottom: 150, left: 100, width: 100, height: 100 } );
  237. scrollViewportToShowTarget( { target, viewportOffset } );
  238. assertScrollPosition( firstAncestor, { scrollTop: 150, scrollLeft: 200 } );
  239. sinon.assert.notCalled( window.scrollTo );
  240. } );
  241. it( 'scrolls the viewport to show the target (above)', () => {
  242. stubRect( target, { top: -200, right: 200, bottom: -100, left: 100, width: 100, height: 100 } );
  243. scrollViewportToShowTarget( { target, viewportOffset } );
  244. assertScrollPosition( firstAncestor, { scrollTop: -100, scrollLeft: 200 } );
  245. sinon.assert.calledWithExactly( window.scrollTo, 100, -130 );
  246. } );
  247. it( 'scrolls the viewport to show the target (partially above)', () => {
  248. stubRect( target, { top: -50, right: 200, bottom: 50, left: 100, width: 100, height: 100 } );
  249. scrollViewportToShowTarget( { target, viewportOffset } );
  250. assertScrollPosition( firstAncestor, { scrollTop: 50, scrollLeft: 200 } );
  251. sinon.assert.calledWithExactly( window.scrollTo, 100, 20 );
  252. } );
  253. it( 'scrolls the viewport to show the target (below)', () => {
  254. stubRect( target, { top: 600, right: 200, bottom: 700, left: 100, width: 100, height: 100 } );
  255. scrollViewportToShowTarget( { target, viewportOffset } );
  256. assertScrollPosition( firstAncestor, { scrollTop: 700, scrollLeft: 200 } );
  257. sinon.assert.calledWithExactly( window.scrollTo, 100, 350 );
  258. } );
  259. it( 'scrolls the viewport to show the target (partially below)', () => {
  260. stubRect( target, { top: 450, right: 200, bottom: 550, left: 100, width: 100, height: 100 } );
  261. scrollViewportToShowTarget( { target, viewportOffset } );
  262. assertScrollPosition( firstAncestor, { scrollTop: 550, scrollLeft: 200 } );
  263. sinon.assert.calledWithExactly( window.scrollTo, 100, 200 );
  264. } );
  265. it( 'scrolls the viewport to show the target (to the left)', () => {
  266. stubRect( target, { top: 0, right: -100, bottom: 100, left: -200, width: 100, height: 100 } );
  267. scrollViewportToShowTarget( { target, viewportOffset } );
  268. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: -100 } );
  269. sinon.assert.calledWithExactly( window.scrollTo, -130, 70 );
  270. } );
  271. it( 'scrolls the viewport to show the target (partially to the left)', () => {
  272. stubRect( target, { top: 0, right: 50, bottom: 100, left: -50, width: 100, height: 100 } );
  273. scrollViewportToShowTarget( { target, viewportOffset } );
  274. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 50 } );
  275. sinon.assert.calledWithExactly( window.scrollTo, 20, 70 );
  276. } );
  277. it( 'scrolls the viewport to show the target (to the right)', () => {
  278. stubRect( target, { top: 0, right: 1200, bottom: 100, left: 1100, width: 100, height: 100 } );
  279. scrollViewportToShowTarget( { target, viewportOffset } );
  280. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1200 } );
  281. sinon.assert.calledWithExactly( window.scrollTo, 350, 70 );
  282. } );
  283. it( 'scrolls the viewport to show the target (partially to the right)', () => {
  284. stubRect( target, { top: 0, right: 1050, bottom: 100, left: 950, width: 100, height: 100 } );
  285. scrollViewportToShowTarget( { target, viewportOffset } );
  286. assertScrollPosition( firstAncestor, { scrollTop: 100, scrollLeft: 1050 } );
  287. sinon.assert.calledWithExactly( window.scrollTo, 200, 70 );
  288. } );
  289. }
  290. } );
  291. function stubRect( target, geometryStub, scrollStub ) {
  292. if ( isRange( target ) ) {
  293. testUtils.sinon.stub( target, 'getClientRects' ).returns( [ geometryStub ] );
  294. } else {
  295. testUtils.sinon.stub( target, 'getBoundingClientRect' ).returns( geometryStub );
  296. // Make the element immune to the border-width-* styles in the test environment.
  297. Object.defineProperties( target, {
  298. offsetWidth: {
  299. value: geometryStub.width
  300. },
  301. clientWidth: {
  302. value: geometryStub.width
  303. },
  304. offsetHeight: {
  305. value: geometryStub.height
  306. },
  307. clientHeight: {
  308. value: geometryStub.height
  309. }
  310. } );
  311. }
  312. if ( scrollStub ) {
  313. let { scrollLeft, scrollTop } = scrollStub;
  314. // There's no way to stub scrollLeft|Top with Sinon. defineProperties
  315. // must be used instead.
  316. Object.defineProperties( target, {
  317. scrollLeft: {
  318. get() {
  319. return scrollLeft;
  320. },
  321. set( value ) {
  322. scrollLeft = value;
  323. },
  324. configurable: true
  325. },
  326. scrollTop: {
  327. get() {
  328. return scrollTop;
  329. },
  330. set( value ) {
  331. scrollTop = value;
  332. },
  333. configurable: true
  334. }
  335. } );
  336. }
  337. }
  338. function assertScrollPosition( element, expected ) {
  339. expect( element.scrollTop ).to.equal( expected.scrollTop, 'scrollTop' );
  340. expect( element.scrollLeft ).to.equal( expected.scrollLeft, 'scrollLeft' );
  341. }