121 lines
3.8 KiB
HTML
121 lines
3.8 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-buttons">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="../support/common.js"></script>
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<script src="/resources/testdriver.js"></script>
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<script src="/resources/testdriver-vendor.js"></script>
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<script src="/resources/testdriver-actions.js"></script>
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<script src="/dom/events/scrolling/scroll_support.js"></script>
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<style>
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.container {
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position: relative;
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height: 150px;
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/* Ensure width is sufficiently different than height to ensure that
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* the directional scroll is using the scrollport size in the associated
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* direction. */
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width: 400px;
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position: relative;
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}
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.scroller {
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height: 100%;
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overflow: auto;
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position: relative;
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counter-reset: page;
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}
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.scroller.right {
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/* Flow content horizontally. */
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white-space: nowrap;
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}
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.scroller::scroll-button(*) {
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width: 100px;
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height: 50px;
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background: green;
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position: absolute;
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/* Center the button within the scroller so that the call to
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* test_driver.click(scroller) hits the button. */
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left: calc(50% - 50px);
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top: calc(50% - 25px);
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}
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/* Create scroll buttons for test scrollers. */
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.scroller.test.down::scroll-button(down) {
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content: "";
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}
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.scroller.test.right::scroll-button(right) {
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content: "";
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}
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.page {
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box-sizing: border-box;
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height: 100%;
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}
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.scroller.right .page {
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/* Flow horizontally in horizontal scroller */
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display: inline-block;
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width: 100%;
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}
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/* Make pages visible for manual testing. */
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.page:nth-child(2*n) {
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background: lightgray;
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}
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.page::before {
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counter-increment: page;
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content: "Page " counter(page);
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}
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</style>
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<div class="container">
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<div class="scroller test down" id="scroller1">
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<div class="page"></div>
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<div class="page"></div>
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<div class="page"></div>
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<div class="page"></div>
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</div>
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</div>
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<div class="container">
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<div class="scroller test right" id="scroller2">
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<div class="page"></div>
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<div class="page"></div>
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<div class="page"></div>
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<div class="page"></div>
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</div>
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</div>
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<script>
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async function clickButtonAndWaitForScroll(scroller) {
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const scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
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let wait_click = new Promise(resolve => scroller.addEventListener("click", resolve, {once: true}));
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await test_driver.click(scroller);
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await wait_click;
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await scrollEndPromise;
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}
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promise_test(async () => {
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const scroller = document.querySelector('.scroller.test.down');
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await clickButtonAndWaitForScroll(scroller);
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// Activating the scroll button scrolls the originating element by
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// one "page" in the associated direction. For most implementations this is
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// 85% of the optimal viewing region. We could consider issuing page down
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// and asserting the same distance here.
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const pageHeight = scroller.clientHeight;
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assert_greater_than(scroller.scrollTop, 0.5 * pageHeight);
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assert_less_than_equal(scroller.scrollTop, pageHeight);
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}, "::scroll-button(down) scrolls about a page when clicked");
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promise_test(async () => {
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const scroller = document.querySelector('.scroller.test.right');
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await clickButtonAndWaitForScroll(scroller);
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// Activating the scroll button scrolls the originating element by
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// one "page" in the associated direction. For most implementations this is
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// 85% of the optimal viewing region in that dimension, however the
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// proportion is not precisely specified nor do we have a "Page Right" key
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// we could compare with so we assert it is in the range
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// [0.5, 1] * scrollport width.
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const pageWidth = scroller.clientWidth;
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assert_greater_than(scroller.scrollLeft, 0.5 * pageWidth);
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assert_less_than_equal(scroller.scrollLeft, pageWidth);
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}, "::scroll-button(right) scrolls about a page when clicked");
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</script>
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