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<!DOCTYPE HTML>
<html>
<head>
<title>Test for redundant mouseenter or mouseleave events</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
</head>
<style>
#outer {
background: grey;
position: absolute;
left: 100px;
top: 100px;
width: 100px;
height: 100px;
}
#inner {
background: red;
position: absolute;
left: 30px;
top: 30px;
width: 40px;
height: 40px;
}
</style>
<body>
<!-- Verifies that dragging mouse in/out of an element doesn't fire redundant
mouseenter or mouseleave events (crbug.com/356090 & crbug.com/470258) -->
<div id="outer">
<div id="inner"></div>
</div>
</body>
<script>
let eventLog = [];
let nextUncheckedEventIndex = 0;
// Ensure match to the next sequence of events in the event log.
function assert_next_events(target, expectedEventNames, message) {
for (let i = 0; i < expectedEventNames.length; i++) {
assert_true(nextUncheckedEventIndex < eventLog.length,
`${message}: empty event queue`);
const observed = eventLog[nextUncheckedEventIndex++];
const expected = `${expectedEventNames[i]}@${target.id}`;
assert_equals(observed, expected,`${message}: Event mismatch`);
}
}
// After validating the expected events, all entries in the event map
// must be false or we have recorded an unexpected event.
function assert_empty_event_queue(message) {
const uncheckedEvents = eventLog.length - nextUncheckedEventIndex;
assert_equals(uncheckedEvents, 0,
`${message}: Unexpected events ` +
`${eventLog.slice(-uncheckedEvents).join(", ")}`);
}
function addEventListeners(test) {
const eventTypes = [
'mousedown',
'mouseenter',
'mouseleave',
'mousemove',
'mouseout',
'mouseover',
'mouseup'
];
['inner', 'outer'].forEach(id => {
const element = document.getElementById(id);
eventTypes.forEach(eventType => {
const listener = (e) => {
if (e.eventPhase == Event.AT_TARGET) {
eventLog.push(`${eventType}@${id}`);
}
};
element.addEventListener(eventType, listener);
test.add_cleanup(() => {
element.removeEventListener(eventType, listener);
});
})
});
}
// At the end of each action sequence we move the mouse over the root element.
// Once this event is detected, all other upstream events must be logged and
// we can proceed with the checks.
async function mousemoveOverRootElement() {
return new Promise(resolve => {
const listener = (e) => {
if (e.eventPhase == Event.AT_TARGET) {
document.documentElement.removeEventListener('mousemove', listener);
resolve();
}
};
document.documentElement.addEventListener('mousemove', listener);
});
}
window.onload = async () => {
const outer = document.getElementById('outer');
const inner = document.getElementById('inner');
const leftOuter = 100;
const rightOuter = 200;
const leftInner = 130;
const rightInner = 170;
const centerY = 150;
promise_test(async t => {
addEventListeners(t);
const completionPromise = mousemoveOverRootElement();
const actions =new test_driver.Actions();
actions.pointerMove(leftOuter + 10, centerY)
.pointerDown({button: actions.ButtonType.LEFT})
.pointerMove(rightOuter - 10, centerY)
.pointerUp({button: actions.ButtonType.LEFT})
.pointerMove(0, 0)
.send();
await actions;
await completionPromise;
assert_next_events(outer, ['mouseover', 'mouseenter', 'mousemove'],
'Move over outer element');
assert_next_events(outer, ['mousedown', 'mousemove', 'mouseup'],
'Drag across outer element');
assert_next_events(outer, ['mouseout', 'mouseleave'],
'Move to origin');
assert_empty_event_queue('Drag across outer element');
}, 'Test dragging across inner div');
promise_test(async t => {
addEventListeners(t);
const completionPromise = mousemoveOverRootElement();
const actions =new test_driver.Actions();
actions.pointerMove(leftOuter + 10, centerY)
.pointerDown({button: actions.ButtonType.LEFT})
.pointerMove(leftInner + 10, centerY)
.pointerUp({button: actions.ButtonType.LEFT})
.pointerMove(0, 0)
.send();
await actions;
await completionPromise;
assert_next_events(outer, ['mouseover', 'mouseenter', 'mousemove'],
'Move over outer element');
assert_next_events(outer, ['mousedown', 'mouseout'],
'Initiate drag');
assert_next_events(inner,
['mouseover', 'mouseenter', 'mousemove', 'mouseup'],
'Drag into inner element');
assert_next_events(inner, ['mouseout', 'mouseleave'],
'Move to origin');
assert_next_events(outer, [ 'mouseleave'],
'Move to origin');
assert_empty_event_queue('Drag into inner element');
}, 'Test dragging into inner div');
promise_test(async t => {
addEventListeners(t);
const completionPromise = mousemoveOverRootElement();
const actions =new test_driver.Actions();
actions.pointerMove(leftInner + 10, centerY)
.pointerDown({button: actions.ButtonType.LEFT})
.pointerMove(rightInner + 10, centerY)
.pointerUp({button: actions.ButtonType.LEFT})
.pointerMove(0, 0)
.send();
await actions;
await completionPromise;
assert_next_events(inner, ['mouseover'], 'Move over inner element');
assert_next_events(outer, ['mouseenter'], 'Enter outer');
assert_next_events(inner, ['mouseenter', 'mousemove'],
'Move across inner element');
assert_next_events(inner, ['mousedown', 'mouseout', 'mouseleave'],
'Drag out of inner');
assert_next_events(outer, ['mouseover', 'mousemove', 'mouseup'],
'Drag into outer');
assert_next_events(outer, ['mouseout', 'mouseleave'],
'Move to origin');
assert_empty_event_queue('Drag into inner element');
}, 'Test dragging out of inner div');
};
</script>
</html>
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