| <!DOCTYPE html> |
| <script src="../../../resources/testharness.js"></script> |
| <script src="../../../resources/testharnessreport.js"></script> |
| <script src="../../../resources/gesture-util.js"></script> |
| <style> |
| body { |
| height: 1800px; |
| } |
| </style> |
| <script> |
| // Compute ScrollableArea::pageStep. |
| var pageStep = innerHeight * 0.875; |
| if (navigator.userAgent.indexOf("Mac OS X") >= 0) |
| pageStep = Math.max(pageStep, innerHeight - 40); |
| |
| promise_test(async () => { |
| // Click in the vertical scrollbar track, below the thumb, and hold the |
| // mouse button down. The animation shouldn't continue past the initial |
| // page step since the initial page step will take the scrollbar thumb |
| // under the cursor. |
| await mouseMoveTo(790, 280); |
| await mouseDownAt(790, 280); |
| |
| // TODO(crbug.com/1172003): This needs to be fixed for track autoscrolls. |
| // Impulse based animations have a longer duration than the default ease |
| // in/out curve. So when an autoscroll animation is initiated (~250ms |
| // after the initial mousedown), the animation generated by the initial |
| // mousedown on the scrollbar track will need to be aborted by the |
| // cc::ScrollbarController (as the cc::KeyframeModel doesn't allow multiple |
| // sources animating the scroll offset). As a result, the thumb can be |
| // anywhere between 0 and pageStep. As long as the thumb doesn't cross the |
| // pointer location (i.e the offset at pageStep), this test is considered |
| // successful. (Note that this is not an issue while using the default ease |
| // in/out curve because the initial mousedown animation would've already |
| // finished by the time the autoscroll animation is being kicked off) |
| await waitForAnimationEndTimeBased( () => { return scrollY; } ); |
| assert_true(window.scrollY > 0 && window.scrollY <= pageStep, |
| "window.scrollY = " + window.scrollY + " "); |
| }, 'Scrollbar track autoscrolling doesn\'t overshoot cursor.'); |
| </script> |
