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<!DOCTYPE HTML>
<html>
<!--
Some tests ported from IntersectionObserver/polyfill/intersection-observer-test.html
Original license header:
Copyright 2016 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<head>
<meta charset="utf-8">
<title>Test for Bug 1499961</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body onload="onLoad()">
<p id="display"></p>
<pre id="test">
<script type="application/javascript">
/* eslint-disable no-shadow */
var tests = [];
var curDescribeMsg = '';
var curItMsg = '';
function beforeEach_fn() { };
function afterEach_fn() { };
function before(fn) {
fn();
}
function beforeEach(fn) {
beforeEach_fn = fn;
}
function afterEach(fn) {
afterEach_fn = fn;
}
function it(msg, fn) {
tests.push({
msg: `${msg} [${curDescribeMsg}]`,
fn: fn
});
}
var callbacks = [];
function callDelayed(fn) {
callbacks.push(fn);
}
requestAnimationFrame(function tick() {
var i = callbacks.length;
while (i--) {
var cb = callbacks[i];
SimpleTest.executeSoon(function() { SimpleTest.executeSoon(cb) });
callbacks.splice(i, 1);
}
requestAnimationFrame(tick);
});
function expect(val) {
return {
to: {
throwException: function (regexp) {
try {
val();
ok(false, `${curItMsg} - an exception should have beeen thrown`);
} catch (e) {
ok(regexp.test(e), `${curItMsg} - supplied regexp should match thrown exception`);
}
},
get be() {
var fn = function (expected) {
is(val, expected, curItMsg);
};
fn.ok = function () {
ok(val, curItMsg);
};
fn.greaterThan = function (other) {
ok(val > other, `${curItMsg} - ${val} should be greater than ${other}`);
};
fn.lessThan = function (other) {
ok(val < other, `${curItMsg} - ${val} should be less than ${other}`);
};
return fn;
},
eql: function (expected) {
if (Array.isArray(expected)) {
if (!Array.isArray(val)) {
ok(false, curItMsg, `${curItMsg} - should be an array,`);
return;
}
is(val.length, expected.length, curItMsg, `${curItMsg} - arrays should be the same length`);
if (expected.length != val.length) {
return;
}
for (var i = 0; i < expected.length; i++) {
is(val[i], expected[i], `${curItMsg} - array elements at position ${i} should be equal`);
if (expected[i] != val[i]) {
return;
}
}
ok(true);
}
},
}
}
}
function describe(msg, fn) {
curDescribeMsg = msg;
fn();
curDescribeMsg = '';
}
function next() {
var test = tests.shift();
if (test) {
console.log(test.msg);
curItMsg = test.msg;
var fn = test.fn;
beforeEach_fn();
if (fn.length) {
fn(function () {
afterEach_fn();
next();
});
} else {
fn();
afterEach_fn();
next();
}
} else {
SimpleTest.finish();
}
}
var sinon = {
spy: function () {
var callbacks = [];
var fn = function () {
fn.callCount++;
fn.lastCall = { args: arguments };
if (callbacks.length) {
callbacks.shift()();
}
};
fn.callCount = 0;
fn.lastCall = { args: [] };
fn.waitForNotification = (fn) => {
callbacks.push(fn);
};
return fn;
}
};
var ASYNC_TIMEOUT = 300;
var io;
var noop = function() {};
// References to DOM elements, which are accessible to any test
// and reset prior to each test so state isn't shared.
var rootEl;
var grandParentEl;
var parentEl;
var targetEl1;
var targetEl2;
var targetEl3;
var targetEl4;
var targetEl5;
describe('IntersectionObserver', function() {
before(function() {
});
beforeEach(function() {
addStyles();
addFixtures();
});
afterEach(function() {
if (io && 'disconnect' in io) io.disconnect();
io = null;
window.onmessage = null;
removeStyles();
removeFixtures();
});
describe('constructor', function() {
it('move iframe and check reflow', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
runSequence([
// Do a first change and wait for its intersection observer
// notification, to ensure one full reflow was completed.
function(done) {
targetEl1.style.top = '0px';
io.observe(targetEl1);
spy.waitForNotification(function() {
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].target).to.be(targetEl1);
done();
});
},
// Do another change, which may trigger an incremental reflow only.
function(done) {
targetEl4.style.top = '-20px';
targetEl4.style.left = '20px';
io.observe(targetEl4);
spy.waitForNotification(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].target).to.be(targetEl4);
// After the iframe is moved, reflow should include its parent,
// even if the iframe is a reflow root.
// If moved correctly (outside of rootEl), the intersection ratio
// should now be 0.
expect(records[0].intersectionRatio).to.be(0);
done();
});
}
], done);
});
});
});
/**
* Runs a sequence of function and when finished invokes the done callback.
* Each function in the sequence is invoked with its own done function and
* it should call that function once it's complete.
* @param {Array<Function>} functions An array of async functions.
* @param {Function} done A final callback to be invoked once all function
* have run.
*/
function runSequence(functions, done) {
var next = functions.shift();
if (next) {
next(function() {
runSequence(functions, done);
});
} else {
done && done();
}
}
/**
* Sorts an array of records alphebetically by ascending ID. Since the current
* native implementation doesn't sort change entries by `observe` order, we do
* that ourselves for the non-polyfill case. Since all tests call observe
* on targets in sequential order, this should always match.
* @param {Array<IntersectionObserverEntry>} entries The entries to sort.
* @return {Array<IntersectionObserverEntry>} The sorted array.
*/
function sortRecords(entries) {
entries = entries.sort(function(a, b) {
return a.target.id < b.target.id ? -1 : 1;
});
return entries;
}
/**
* Adds the common styles used by all tests to the page.
*/
function addStyles() {
var styles = document.createElement('style');
styles.id = 'styles';
document.documentElement.appendChild(styles);
var cssText =
'#root {' +
' position: relative;' +
' width: 400px;' +
' height: 200px;' +
' background: #eee' +
'}' +
'#grand-parent {' +
' position: relative;' +
' width: 200px;' +
' height: 200px;' +
'}' +
'#parent {' +
' position: absolute;' +
' top: 0px;' +
' left: 200px;' +
' overflow: hidden;' +
' width: 200px;' +
' height: 200px;' +
' background: #ddd;' +
'}' +
'#target1, #target2, #target3, #target4 {' +
' position: absolute;' +
' top: 0px;' +
' left: 0px;' +
' width: 20px;' +
' height: 20px;' +
' transform: translateX(0px) translateY(0px);' +
' transition: transform .5s;' +
' background: #f00;' +
' border: none;' +
'}';
styles.innerHTML = cssText;
}
/**
* Adds the DOM fixtures used by all tests to the page and assigns them to
* global variables so they can be referenced within the tests.
*/
function addFixtures() {
var fixtures = document.createElement('div');
fixtures.id = 'fixtures';
fixtures.innerHTML =
'<div id="root">' +
' <div id="grand-parent">' +
' <div id="parent">' +
' <div id="target1"></div>' +
' <div id="target2"></div>' +
' <div id="target3"></div>' +
' <iframe id="target4"></iframe>' +
' </div>' +
' </div>' +
'</div>';
document.body.appendChild(fixtures);
rootEl = document.getElementById('root');
grandParentEl = document.getElementById('grand-parent');
parentEl = document.getElementById('parent');
targetEl1 = document.getElementById('target1');
targetEl2 = document.getElementById('target2');
targetEl3 = document.getElementById('target3');
targetEl4 = document.getElementById('target4');
}
/**
* Removes the common styles from the page.
*/
function removeStyles() {
var styles = document.getElementById('styles');
styles.remove();
}
/**
* Removes the DOM fixtures from the page and resets the global references.
*/
function removeFixtures() {
var fixtures = document.getElementById('fixtures');
fixtures.remove();
rootEl = null;
grandParentEl = null;
parentEl = null;
targetEl1 = null;
targetEl2 = null;
targetEl3 = null;
targetEl4 = null;
}
function onLoad() {
next();
}
SimpleTest.waitForExplicitFinish();
</script>
</pre>
<div id="log">
</div>
</body>
</html>