| <!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; |
| height: 10000px; |
| } |
| </style> |
| |
| <script> |
| // This test ensures that animated mouse wheel scrolls with tiny amounts are |
| // accurately propagated in the renderer. |
| |
| async function tryScroll(distance, source) { |
| const x = 400; |
| const y = 300; |
| const precise_deltas = false; |
| |
| const scrollYBefore = window.scrollY; |
| |
| await waitForCompositorCommit(); |
| |
| await smoothScroll(distance, |
| x, y, |
| source, |
| 'down', |
| SPEED_INSTANT, |
| precise_deltas); |
| |
| await waitFor(() => { return window.scrollY - scrollYBefore >= distance; }, |
| "Didn't scroll by expected amount: " + distance); |
| await waitForCompositorCommit(); |
| } |
| |
| window.onload = async () => { |
| const source_type = GestureSourceType.MOUSE_INPUT; |
| |
| promise_test(async () => { |
| assert_equals(window.scrollY, 0); |
| await tryScroll(1, source_type); |
| assert_equals(window.scrollY, 1); |
| }, 'Synthetic animated ' + GestureSourceType.ToString(source_type) + |
| ' gestures accurately scroll delta (0, 1).'); |
| |
| promise_test(async () => { |
| assert_equals(window.scrollY, 1); |
| await tryScroll(2, source_type); |
| assert_equals(window.scrollY, 3); |
| window.scrollTo(0, 0); |
| }, 'Synthetic animated ' + GestureSourceType.ToString(source_type) + |
| ' gestures accurately scroll delta (0, 2).'); |
| } |
| </script> |
