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<!DOCTYPE html>
<meta charset="utf-8">
<title>ScrollTimeline current time algorithm - interaction with writing modes</title>
<link rel="help" href="https://wicg.github.io/scroll-animations/#current-time-algorithm">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="./testcommon.js"></script>
<body></body>
<script>
'use strict';
promise_test(async t => {
const scrollerOverrides = new Map([['direction', 'rtl']]);
const scroller = setupScrollTimelineTest(scrollerOverrides);
const verticalScrollRange = scroller.scrollHeight - scroller.clientHeight;
const horizontalScrollRange = scroller.scrollWidth - scroller.clientWidth;
const blockScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'block'});
const inlineScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'inline'});
const horizontalScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'horizontal'});
const verticalScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'vertical'});
// Unscrolled, all timelines should read a current time of 0 even though the
// X-axis will have started at the right hand side for rtl.
assert_percents_equal(blockScrollTimeline.currentTime, 0,
'Unscrolled block timeline');
assert_percents_equal(inlineScrollTimeline.currentTime, 0,
'Unscrolled inline timeline');
assert_percents_equal(horizontalScrollTimeline.currentTime, 0,
'Unscrolled horizontal timeline');
assert_percents_equal(verticalScrollTimeline.currentTime, 0,
'Unscrolled vertical timeline');
// The offset in the inline/horizontal direction should be inverted. The
// block/vertical direction should be unaffected.
scroller.scrollTop = 0.1 * verticalScrollRange;
scroller.scrollLeft = -0.8 * horizontalScrollRange;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_percents_equal(blockScrollTimeline.currentTime, 10,
'Scrolled block timeline');
assert_percents_equal(inlineScrollTimeline.currentTime, 80,
'Scrolled inline timeline');
assert_percents_equal(horizontalScrollTimeline.currentTime, 80,
'Scrolled horizontal timeline');
assert_percents_equal(verticalScrollTimeline.currentTime, 10,
'Scrolled vertical timeline');
}, 'currentTime handles direction: rtl correctly');
promise_test(async t => {
const scrollerOverrides = new Map([['writing-mode', 'vertical-rl']]);
const scroller = setupScrollTimelineTest(scrollerOverrides);
const verticalScrollRange = scroller.scrollHeight - scroller.clientHeight;
const horizontalScrollRange = scroller.scrollWidth - scroller.clientWidth;
const blockScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'block'});
const inlineScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'inline'});
const horizontalScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'horizontal'});
const verticalScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'vertical'});
// Unscrolled, all timelines should read a current time of 0 even though the
// X-axis will have started at the right hand side for vertical-rl.
assert_percents_equal(blockScrollTimeline.currentTime, 0,
'Unscrolled block timeline');
assert_percents_equal(inlineScrollTimeline.currentTime, 0,
'Unscrolled inline timeline');
assert_percents_equal(horizontalScrollTimeline.currentTime, 0,
'Unscrolled horizontal timeline');
assert_percents_equal(verticalScrollTimeline.currentTime, 0,
'Unscrolled vertical timeline');
// For vertical-rl, the X-axis starts on the right-hand-side and is the block
// axis. The Y-axis is normal but is the inline axis. For the
// horizontal/vertical cases, horizontal starts on the right-hand-side and
// vertical is normal.
scroller.scrollTop = 0.1 * verticalScrollRange;
scroller.scrollLeft = -0.8 * horizontalScrollRange;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_percents_equal(blockScrollTimeline.currentTime, 80,
'Scrolled block timeline');
assert_percents_equal(inlineScrollTimeline.currentTime, 10,
'Scrolled inline timeline');
assert_percents_equal(horizontalScrollTimeline.currentTime, 80,
'Scrolled horizontal timeline');
assert_percents_equal(verticalScrollTimeline.currentTime, 10,
'Scrolled vertical timeline');
}, 'currentTime handles writing-mode: vertical-rl correctly');
promise_test(async t => {
const scrollerOverrides = new Map([['writing-mode', 'vertical-lr']]);
const scroller = setupScrollTimelineTest(scrollerOverrides);
const verticalScrollRange = scroller.scrollHeight - scroller.clientHeight;
const horizontalScrollRange = scroller.scrollWidth - scroller.clientWidth;
const blockScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'block'});
const inlineScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'inline'});
const horizontalScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'horizontal'});
const verticalScrollTimeline = new ScrollTimeline(
{source: scroller, axis: 'vertical'});
// Unscrolled, all timelines should read a current time of 0.
assert_percents_equal(blockScrollTimeline.currentTime, 0,
'Unscrolled block timeline');
assert_percents_equal(inlineScrollTimeline.currentTime, 0,
'Unscrolled inline timeline');
assert_percents_equal(horizontalScrollTimeline.currentTime, 0,
'Unscrolled horizontal timeline');
assert_percents_equal(verticalScrollTimeline.currentTime, 0,
'Unscrolled vertical timeline');
// For vertical-lr, both axes start at their 'normal' positions but the X-axis
// is the block direction and the Y-axis is the inline direction. This does
// not affect horizontal/vertical.
scroller.scrollTop = 0.1 * verticalScrollRange;
scroller.scrollLeft = 0.2 * horizontalScrollRange;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_percents_equal(blockScrollTimeline.currentTime, 20,
'Scrolled block timeline');
assert_percents_equal(inlineScrollTimeline.currentTime, 10,
'Scrolled inline timeline');
assert_percents_equal(horizontalScrollTimeline.currentTime, 20,
'Scrolled horizontal timeline');
assert_percents_equal(verticalScrollTimeline.currentTime, 10,
'Scrolled vertical timeline');
}, 'currentTime handles writing-mode: vertical-lr correctly');
</script>
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