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| (Empty) |
| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <script src="../../resources/testharness.js"></script> | |
| 5 <script src="../../resources/testharnessreport.js"></script> | |
| 6 <script src="resources/scroll-interruption-test.js"></script> | |
| 7 <script type="text/javascript"> | |
| 8 const numItems = 500; | |
| 9 | |
| 10 function jsScroll(y) { | |
| 11 document.getElementById('listbox').scrollTop = {y: y, behavior: 'smooth'}; | |
| 12 } | |
| 13 | |
| 14 function initializeContents(listbox) { | |
| 15 for (var i = 0; i < numItems; i++) { | |
| 16 var option = document.createElement('option'); | |
| 17 option.appendChild(document.createTextNode(i)); | |
| 18 listbox.appendChild(option); | |
| 19 } | |
| 20 } | |
| 21 | |
| 22 function convertIndexToScrollOffset(index, listbox, approximateItemHeight) { | |
| 23 var scrollOffset = Math.floor(index * approximateItemHeight); | |
| 24 | |
| 25 // The scroll offset set on a list box can get rounded to the nearest whol
e-item | |
| 26 // offset. We set and then readback the scroll offset to get the rounded v
alue | |
| 27 // (so that the scroll offsets used during the test won't be subject to fu
rther | |
| 28 // rounding). | |
| 29 listbox.scrollTop = scrollOffset; | |
| 30 scrollOffset = listbox.scrollTop; | |
| 31 return scrollOffset; | |
| 32 } | |
| 33 | |
| 34 function initializeTest(indexTargets, targets, innerPoint, listbox) { | |
| 35 var approximateItemHeight = listbox.clientHeight / listbox.size; | |
| 36 | |
| 37 // Convert from listbox item index to scroll offset. | |
| 38 targets.y_min = convertIndexToScrollOffset(indexTargets.index_min, listbox
, approximateItemHeight); | |
| 39 targets.y_mid = convertIndexToScrollOffset(indexTargets.index_mid, listbox
, approximateItemHeight); | |
| 40 targets.y_max = convertIndexToScrollOffset(indexTargets.index_max, listbox
, approximateItemHeight); | |
| 41 | |
| 42 var boundingRect = listbox.getBoundingClientRect(); | |
| 43 innerPoint.x = (boundingRect.left + boundingRect.right)/2; | |
| 44 innerPoint.y = (boundingRect.top + boundingRect.bottom)/2; | |
| 45 } | |
| 46 | |
| 47 function doTest() { | |
| 48 var indexTargets = {index_min: 3, index_mid: 200, index_max: 400}; | |
| 49 var targets = {}; | |
| 50 var innerPoint = {}; | |
| 51 var element = document.getElementById('listbox'); | |
| 52 initializeContents(element); | |
| 53 initializeTest(indexTargets, targets, innerPoint, element); | |
| 54 var scrollInterruptionTest = new SmoothScrollInterruptionTest(element, | |
| 55 innerPoint, | |
| 56 targets, | |
| 57 jsScroll); | |
| 58 scrollInterruptionTest.run(); | |
| 59 } | |
| 60 | |
| 61 window.addEventListener('load', doTest, false); | |
| 62 </script> | |
| 63 </head> | |
| 64 | |
| 65 <body> | |
| 66 <p>Test that interrupting a smooth scroll on a listbox works with both scroll
behaviors and with input</p> | |
| 67 <select size="4" id="listbox"></select> | |
| 68 </body> | |
| 69 </html> | |
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Chromium Code Reviews
Issue 782793002:
Update Element API for CSSOM smooth scrolling to match the spec (Closed)
Base URL: svn://svn.chromium.org/blink/trunk