| <!DOCTYPE html> |
| <script src='../../resources/testharness.js'></script> |
| <script src='../../resources/testharnessreport.js'></script> |
| <script src='../../resources/gesture-util.js'></script> |
| <!-- This div is 200 pixels high. The content results in scrool bars on |
| both edges, resulting in an effective content area of 185 x 185 on |
| linux. The paging context overlap is 24 pixels. So one page of scroll |
| moves the content by 185 - 24 -= 161 pixels. --> |
| <div id="overflow" style="border:2px solid black;overflow:auto;height:200px;width:200px;"> |
| <div style="height:300px;width:600px"> |
| <div style="background-color:red;height:300px;width:300px;position:relative;left:0px;top:0px"></div> |
| <div style="background-color:green;height:300px;width:300px;position:relative;left:300px;top:-300px"></div> |
| </div> |
| <div style="height:300px;width:600px"> |
| <div style="background-color:blue;height:300px;width:300px;position:relative;left:0px;top:0px"></div> |
| <div style="background-color:yellow;height:300px;width:300px;position:relative;left:300px;top:-300px"></div> |
| </div> |
| </div> |
| |
| <script> |
| var givenScrollTop = 2; // When paging, this is ignored. Every event is one page. |
| var expectedScrollTop = 161; |
| var last_event = null; |
| var source = GestureSourceType.MOUSE_INPUT; |
| const numTicksY = givenScrollTop / pixelsPerTick(); |
| const expectedWheelDeltaY = numTicksY * LEGACY_MOUSE_WHEEL_TICK_MULTIPLIER; |
| |
| function mousewheelHandler(e) |
| { |
| last_event = e; |
| } |
| |
| promise_test(async () => { |
| const overflowElement = document.getElementById("overflow"); |
| overflowElement.addEventListener("mousewheel", mousewheelHandler, false); |
| |
| await smoothScroll(givenScrollTop, 100, 110, source, 'down', SPEED_INSTANT, false /* precise_scrolling_deltas */, true /* scroll_by_page */); |
| await waitFor( () => { |
| return overflowElement.scrollTop == window.expectedScrollTop; |
| }); |
| assert_equals(last_event.wheelDeltaY, -Math.floor(expectedWheelDeltaY)); |
| assert_equals(last_event.wheelDeltaX, 0); |
| assert_equals(last_event.wheelDelta, -Math.floor(expectedWheelDeltaY)); |
| }, "Page-based wheel scrolls provide correct delta in event handler, scrolling on overflow div."); |
| </script> |
