| <!DOCTYPE HTML> |
| <script src='../../resources/testharness.js'></script> |
| <script src='../../resources/testharnessreport.js'></script> |
| <script src='../../resources/gesture-util.js'></script> |
| <style> |
| body,html { |
| margin: 0; |
| width: 10000px; |
| height: 10000px; |
| } |
| </style> |
| |
| <script> |
| const scroller = document.scrollingElement; |
| let floatPrecision = 0.00001; |
| |
| window.addEventListener('load', async () => { |
| await waitForCompositorCommit(); |
| |
| promise_test(async () => { |
| scroller.scrollTop = 0; |
| scroller.scrollLeft = 0; |
| const distance = 5; |
| const x = 400; |
| const y = 300; |
| const precise_deltas = true; |
| |
| if (window.internals) { |
| window.internals.setPageScaleFactor(4); |
| window.internals.setVisualViewportOffset(600, 450); |
| await waitForCompositorCommit(); |
| } |
| |
| let expected_scroll = distance / window.visualViewport.scale; |
| |
| // If fractional scroll offsets are enabled, the expected scroll offset |
| // should be the actuall fractional distance we scrolled. Otherwise the |
| // offset should be truncated. |
| if (internals.runtimeFlags.fractionalScrollOffsetsEnabled) { |
| assert_not_equals(expected_scroll, |
| Math.round(expected_scroll), |
| 'Expected scroll should be fractional'); |
| } else { |
| expected_scroll = Math.floor(expected_scroll); |
| } |
| |
| // Scroll Vertically |
| await smoothScroll(distance, |
| x, y, |
| GestureSourceType.TOUCHPAD_INPUT, |
| 'down', |
| SPEED_INSTANT, |
| precise_deltas); |
| |
| await waitFor(() => { return scroller.scrollTop >= expected_scroll; }, |
| "Didn't scroll to expected value."); |
| await waitForCompositorCommit(); |
| assert_approx_equals(scroller.scrollTop, expected_scroll, floatPrecision); |
| |
| await waitForCompositorCommit(); |
| |
| // Scroll Horizontally |
| await smoothScroll(distance, |
| x, y, |
| GestureSourceType.TOUCHPAD_INPUT, |
| 'right', |
| SPEED_INSTANT, |
| precise_deltas); |
| |
| await waitFor(() => { return scroller.scrollLeft >= expected_scroll; }, |
| "Didn't scroll to expected value."); |
| |
| await waitForCompositorCommit(); |
| |
| assert_approx_equals(scroller.scrollLeft, expected_scroll, floatPrecision); |
| }, 'Scrolling while zoomed scroller preserves fractional offsets.'); |
| }); |
| </script> |
