| <!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] --> |
| <html> |
| <head> |
| <style> |
| body { |
| height: 10000px; |
| background-image: repeating-linear-gradient(white, silver 200px); |
| } |
| |
| .fixed { |
| position: fixed; |
| top: 0; |
| } |
| </style> |
| <script src="../../../resources/js-test-pre.js"></script> |
| <script src="../../../resources/ui-helper.js"></script> |
| <script> |
| var jsTestIsAsync = true; |
| |
| async function doMouseWheelScroll() |
| { |
| await UIHelper.renderingUpdate(); |
| |
| await UIHelper.startMonitoringWheelEvents(); |
| eventSender.mouseMoveTo(100, 100); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -10, "began", "none"); |
| await UIHelper.renderingUpdate(); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -10, "changed", "none"); |
| await UIHelper.renderingUpdate(); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -10, "changed", "none"); |
| await UIHelper.renderingUpdate(); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -10, "changed", "none"); |
| await UIHelper.renderingUpdate(); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -10, "changed", "none"); |
| await UIHelper.renderingUpdate(); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -10, "changed", "none"); |
| await UIHelper.renderingUpdate(); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -10, "changed", "none"); |
| await UIHelper.renderingUpdate(); |
| eventSender.mouseScrollByWithWheelAndMomentumPhases(0, 0, "ended", "none"); |
| await UIHelper.waitForScrollCompletion(); |
| |
| await UIHelper.renderingUpdate(); |
| } |
| |
| let layoutCount = 0; |
| async function scrollTest() |
| { |
| debug(''); |
| debug("Test that scrolling doesn't trigger a layout per scroll"); |
| |
| internals.startTrackingLayoutUpdates(); |
| await doMouseWheelScroll(); |
| layoutCount = internals.layoutUpdateCount(); |
| shouldBeTrue('layoutCount <= 4'); |
| if (layoutCount > 4) |
| debug('saw ' + layoutCount + ' layouts') |
| finishJSTest(); |
| } |
| |
| window.addEventListener('load', scrollTest, false); |
| </script> |
| </head> |
| <body> |
| <div class="fixed">fixed</div> |
| <script src="../../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
