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| (Empty) |
| 1 <!DOCTYPE html> | |
| 2 | |
| 3 <html> | |
| 4 <head> | |
| 5 <style> | |
| 6 .container { | |
| 7 width: 200px; | |
| 8 height: 200px; | |
| 9 overflow: scroll; | |
| 10 margin: 20px; | |
| 11 border: 1px solid black; | |
| 12 } | |
| 13 | |
| 14 .scrolled { | |
| 15 width: 180px; | |
| 16 height: 90px; | |
| 17 margin: 10px; | |
| 18 background-color: gray; | |
| 19 position: relative; | |
| 20 } | |
| 21 | |
| 22 .positioned { | |
| 23 width: 120px; | |
| 24 height: 240px; | |
| 25 background-color: green; | |
| 26 position: absolute; | |
| 27 } | |
| 28 | |
| 29 #descendant { | |
| 30 left: 90px; | |
| 31 top: 20px; | |
| 32 background-color: blue; | |
| 33 z-index: -20; | |
| 34 } | |
| 35 </style> | |
| 36 <script> | |
| 37 var debugMode = false; | |
| 38 | |
| 39 if (window.testRunner) | |
| 40 testRunner.dumpAsText(); | |
| 41 | |
| 42 if (window.internals) { | |
| 43 window.internals.settings.setAcceleratedCompositingForOverflowScrollEnable
d(true); | |
| 44 window.internals.settings.setCompositorDrivenAcceleratedScrollingEnabled(f
alse); | |
| 45 } | |
| 46 | |
| 47 function write(str) | |
| 48 { | |
| 49 var pre = document.getElementById('console'); | |
| 50 var text = document.createTextNode(str + '\n'); | |
| 51 pre.appendChild(text); | |
| 52 } | |
| 53 | |
| 54 var iteration = 0; | |
| 55 function printResult(expectedResult) | |
| 56 { | |
| 57 // Force a style recalc. | |
| 58 document.body.offsetTop; | |
| 59 | |
| 60 if (window.internals) { | |
| 61 var container = document.getElementById('container'); | |
| 62 var containerOptedIn = window.internals.needsCompositedScrolling(contain
er); | |
| 63 | |
| 64 if (!containerOptedIn == !expectedResult) | |
| 65 write('Iteration ' + iteration.toString() + ': Passed') | |
| 66 else | |
| 67 write('Iteration ' + iteration.toString() + ': FAILED') | |
| 68 | |
| 69 if (containerOptedIn) { | |
| 70 write('Iteration ' + iteration.toString() + ', container opted in'); | |
| 71 if (debugMode) { | |
| 72 var layerTree = window.internals.layerTreeAsText(document); | |
| 73 write(layerTree); | |
| 74 } | |
| 75 } else { | |
| 76 write('Iteration ' + iteration.toString() + ', container did not opt i
n'); | |
| 77 } | |
| 78 } | |
| 79 iteration++; | |
| 80 } | |
| 81 | |
| 82 function doTest() | |
| 83 { | |
| 84 var descendant = document.getElementById('descendant'); | |
| 85 | |
| 86 // Check that we don't promote if we have an out of flow descendant. | |
| 87 // We need to hide the predecessor and successor so they don't interfere | |
| 88 // with this experiment. | |
| 89 for (i = 0; i < 3; ++i) { | |
| 90 if (i == 0) { | |
| 91 descendant.style.visibility = 'hidden'; | |
| 92 descendant.style.display = ''; | |
| 93 } else if (i == 1) { | |
| 94 descendant.style.visibility = ''; | |
| 95 descendant.style.display = ''; | |
| 96 } else { | |
| 97 descendant.style.visibility = ''; | |
| 98 descendant.style.display = 'none'; | |
| 99 } | |
| 100 | |
| 101 // If the out of flow positioned descendant is visible, we cannot opt | |
| 102 // into composited scrolling. | |
| 103 printResult(i != 1); | |
| 104 } // for i | |
| 105 | |
| 106 } // function doTest | |
| 107 | |
| 108 window.addEventListener('load', doTest, false); | |
| 109 </script> | |
| 110 </head> | |
| 111 | |
| 112 <body> | |
| 113 <div class="container" id="container"> | |
| 114 <div class="scrolled" id="firstChild"></div> | |
| 115 <div class="scrolled" id="secondChild"></div> | |
| 116 <div class="positioned" id="descendant"></div> | |
| 117 </div> | |
| 118 <pre id="console"></pre> | |
| 119 </body> | |
| 120 </html> | |
| 121 | |
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Chromium Code Reviews
Issue 244193002:
Enable universal accelerated overflow scroll (Closed)
Base URL: svn://svn.chromium.org/blink/trunk