| // Helper functions for snapchanged-on-user-* tests. |
| |
| // This performs a touch scroll on |scroller| using the coordinates provided |
| // in |start_pos| and |end_pos|. |
| // It is meant for use in snapchanged & snapchanging tests for triggering snap |
| // events when touch scrolling from |start_pos| to |end_pos|. |
| function snap_event_touch_scroll_helper(start_pos, end_pos) { |
| return new test_driver.Actions() |
| .addPointer("TestPointer", "touch") |
| .pointerMove(start_pos.x, start_pos.y) |
| .pointerDown() |
| .addTick() |
| .pause(200) |
| .pointerMove(end_pos.x, end_pos.y) |
| .addTick() |
| .pointerUp() |
| .send(); |
| } |
| |
| // This drags the provided |scroller|'s scrollbar vertically by |drag_amt|. |
| // Snap event tests should provide a |drag_amt| that would result in a |
| // the desired snap event being triggered. |
| const vertical_offset_into_scrollbar = 30; |
| function snap_event_scrollbar_drag_helper(scroller, scrollbar_width, drag_amt) { |
| let x, y, bounds; |
| if (scroller == document.scrollingElement) { |
| bounds = document.documentElement.getBoundingClientRect(); |
| x = window.innerWidth - Math.round(scrollbar_width / 2); |
| } else { |
| bounds = scroller.getBoundingClientRect(); |
| x = bounds.right - Math.round(scrollbar_width / 2); |
| } |
| y = bounds.top + vertical_offset_into_scrollbar; |
| return new test_driver.Actions() |
| .addPointer('TestPointer', 'mouse') |
| .pointerMove(x, y) |
| .pointerDown() |
| .pointerMove(x, y + drag_amt) |
| .addTick() |
| .pointerUp() |
| .send(); |
| } |
| |
| // This tests that snap event of type |event_type| don't fire for a user (wheel) |
| // scroll that snaps back to the same element. Snap events tests should provide |
| // a |delta| small enough that no change in |scroller|'s snap targets occurs at |
| // the end of the scroll. |
| async function test_no_snap_event(test, scroller, delta, event_type) { |
| const listening_element = scroller == document.scrollingElement |
| ? document : scroller; |
| checkSnapEventSupport(event_type); |
| await waitForScrollReset(test, scroller); |
| await waitForCompositorCommit(); |
| let snap_event_promise = waitForSnapEvent(listening_element, event_type); |
| // Set the scroll destination to just a little off (0, 0) top so we snap |
| // back to the top box. |
| await new test_driver.Actions().scroll(0, 0, delta, delta).send(); |
| let evt = await snap_event_promise; |
| assert_equals(evt, null, "no snap event since scroller is back to top"); |
| assert_equals(scroller.scrollTop, 0, "scroller snaps back to the top"); |
| assert_equals(scroller.scrollLeft, 0, "scroller snaps back to the left"); |
| } |
| |
| async function test_no_snapchanged(t, scroller, delta) { |
| await test_no_snap_event(t, scroller, delta, "snapchanged"); |
| } |