| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <meta charset="utf-8"> |
| <title> CSS Scroll Snap 2 Test: scrollsnapchange events</title> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#snap-events"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/css-scroll-snap-2/resources/common.js"></script> |
| <script src="/css/css-scroll-snap-2/resources/programmatic-scroll-common.js"></script> |
| <script src="/dom/events/scrolling/scroll_support.js"></script> |
| <script src="/web-animations/testcommon.js"></script> |
| </head> |
| |
| <body onload="runTests()"> |
| <style> |
| body { |
| margin: 0px; |
| } |
| |
| div { |
| position: absolute; |
| margin: 0px; |
| } |
| |
| #spacer { |
| width: 2000px; |
| height: 2000px; |
| } |
| |
| .scroller { |
| height: 400px; |
| width: 400px; |
| overflow: scroll; |
| scroll-snap-type: both mandatory; |
| } |
| |
| .snap_point { |
| width: 300px; |
| height: 300px; |
| scroll-snap-align: start; |
| } |
| |
| #snap_point_1 { |
| left: 0px; |
| top: 0px; |
| background-color: red; |
| } |
| |
| #snap_point_2 { |
| top: 300px; |
| left: 300px; |
| background-color: orange; |
| } |
| |
| #snap_point_3 { |
| left: 600px; |
| top: 600px; |
| background-color: blue; |
| } |
| </style> |
| <div id="scroller" class="scroller"> |
| <div id="spacer"></div> |
| <div id="snap_point_1" class="snap_point"></div> |
| <div id="snap_point_2" class="snap_point"></div> |
| <div id="snap_point_3" class="snap_point"></div> |
| </div> |
| <script> |
| function runTests () { |
| let scroller = document.getElementById("scroller"); |
| let snap_point_2 = document.getElementById("snap_point_2"); |
| |
| promise_test(async (t) => { |
| await waitForCompositorCommit(); |
| const test_data = { |
| scroller: scroller, |
| scrolling_function: () => { |
| scroller.scrollTo(snap_point_2.offsetLeft, snap_point_2.offsetTop); |
| }, |
| expected_snap_targets: { block: snap_point_2, inline: snap_point_2 }, |
| expected_scroll_offsets: { |
| x: snap_point_2.offsetLeft, |
| y: snap_point_2.offsetTop, |
| } |
| }; |
| await test_scrollsnapchange(t, test_data); |
| }, "scrollsnapchange event fires after snap target changes via scrollTo"); |
| |
| promise_test(async (t) => { |
| await waitForCompositorCommit(); |
| const test_data = { |
| scroller: scroller, |
| scrolling_function: () => { |
| scroller.scrollTo(snap_point_2.offsetLeft, snap_point_2.offsetTop); |
| }, |
| expected_snap_targets: { block: snap_point_2, inline: snap_point_2 }, |
| expected_scroll_offsets: { |
| x: snap_point_2.offsetLeft, |
| y: snap_point_2.offsetTop, |
| } |
| }; |
| await test_scrollsnapchange(t, test_data, /*use_onsnap_member*/true); |
| }, "Element.onscrollsnapchange event fires after snap target changes via" + |
| "scrollTo"); |
| |
| promise_test(async (t) => { |
| checkSnapEventSupport("scrollsnapchange"); |
| await waitForScrollReset(t, scroller); |
| await waitForCompositorCommit(); |
| assert_equals(scroller.scrollTop, 0, |
| "scroller is initially not scrolled vertically"); |
| assert_equals(scroller.scrollLeft, 0, |
| "scroller is initially not scrolled horizontally"); |
| |
| let scrollsnapchange_promise = waitForScrollSnapChangeEvent(scroller, false); |
| // Set the scroll destination to just a little off (0, 0) so we snap |
| // back to the top box. |
| let scroll_top_target = 10; |
| let scroll_left_target = 10; |
| |
| scroller.scrollTo(scroll_left_target, scroll_top_target); |
| let evt = await scrollsnapchange_promise; |
| assert_equals(evt, null, "no snapchanges since scroller is back to top"); |
| // scroller should snap back to (0,0) with no scrollsnapchange event. |
| assert_equals(scroller.scrollTop, 0, "scroller snaps back to the top"); |
| assert_equals(scroller.scrollLeft, 0, "scroller snaps back to the left"); |
| |
| scrollsnapchange_promise = waitForScrollSnapChangeEvent(scroller); |
| scroll_top_target = snap_point_2.offsetTop + 10; |
| scroll_left_target = snap_point_2.offsetLeft + 10; |
| // This scroll should snap to snap_point_2, so scrollsnapchange should be |
| // fired. |
| scroller.scrollTo(scroll_left_target, scroll_top_target); |
| |
| evt = await scrollsnapchange_promise; |
| assertSnapEvent(evt, { block: snap_point_2, inline: snap_point_2 }) |
| assert_approx_equals(scroller.scrollTop, snap_point_2.offsetTop, 1, |
| "scroller snaps to the top of snap_point_2"); |
| assert_approx_equals(scroller.scrollLeft, snap_point_2.offsetLeft, 1, |
| "scroller snaps to the left of snap_point_2"); |
| }, "scrollsnapchange is not fired if snap target doesn't change on " + |
| "programmatic scroll"); |
| } |
| </script> |
| </body> |
| </html> |
