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Issue 1776493002: IntersectionObserver: use an idle callback to send notifications. (Closed) Base URL: https://chromium.googlesource.com/chromium/src@master
Patch Set: syntax error Created 4 years, 9 months ago
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1 <!DOCTYPE html> 1 <!DOCTYPE html>
2 <script src="../resources/js-test.js"></script> 2 <script src="../resources/js-test.js"></script>
3 <script src="helper-functions.js"></script> 3 <script src="helper-functions.js"></script>
4 <style> 4 <style>
5 #root { 5 #root {
6 width: 200px; 6 width: 200px;
7 height: 200px; 7 height: 200px;
8 overflow-y: scroll; 8 overflow-y: scroll;
9 } 9 }
10 #target { 10 #target {
11 width: 100px; 11 width: 100px;
12 height: 100px; 12 height: 100px;
13 background-color: green; 13 background-color: green;
14 position: absolute; 14 position: absolute;
15 } 15 }
16 </style> 16 </style>
17 <div id="root" style="position: absolute"> 17 <div id="root" style="position: absolute">
18 <div id="target" style="left: 50px; top: 250px"></div> 18 <div id="target" style="left: 50px; top: 250px"></div>
19 </div> 19 </div>
20 20
21 <script> 21 <script>
22 description("Test that no notifications are generated when root is not in the containing block chain of target."); 22 description("Test that no notifications are generated when root is not in the co ntaining block chain of target.");
23 var root = document.getElementById("root"); 23 var root = document.getElementById("root");
24 var target = document.getElementById("target"); 24 var target = document.getElementById("target");
25 var entries = []; 25 var entries = [];
26 26
27 function observer_callback(changes) { 27 var observer = new IntersectionObserver(
28 changes.forEach(function(e) { entries.push(e) }); 28 changes => { entries = entries.concat(changes) },
29 { root: root }
30 );
31
32 onload = function() {
33 observer.observe(target);
34 shouldBeEqualToNumber("entries.length", 0);
35 target.style.top = "10px";
36 // See README for explanation of double RAF.
37 requestAnimationFrame(() => { requestAnimationFrame(step1) });
38 };
39
40 function step1() {
41 entries = entries.concat(observer.takeRecords());
42 shouldBeEqualToNumber("entries.length", 1);
43 if (entries.length > 0) {
44 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 58);
45 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 158);
46 shouldBeEqualToNumber("entries[0].boundingClientRect.top", 18);
47 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 118);
48 shouldBeEqualToNumber("entries[0].intersectionRect.left", 58);
49 shouldBeEqualToNumber("entries[0].intersectionRect.right", 158);
50 shouldBeEqualToNumber("entries[0].intersectionRect.top", 18);
51 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 118);
52 shouldBeEqualToNumber("entries[0].rootBounds.left", 8);
53 shouldBeEqualToNumber("entries[0].rootBounds.right", 193);
54 shouldBeEqualToNumber("entries[0].rootBounds.top", 8);
55 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 208);
56 shouldEvaluateToSameObject("entries[0].target", target);
29 } 57 }
30 new IntersectionObserver(observer_callback, {root: root}).observe(target); 58 target.style.top = "250px";
59 requestAnimationFrame(step2);
60 }
31 61
32 function step0() { 62 function step2() {
33 setTimeout(function() { 63 entries = entries.concat(observer.takeRecords());
34 shouldBeEqualToNumber("entries.length", 0); 64 shouldBeEqualToNumber("entries.length", 2);
35 target.style.top = "10px"; 65 if (entries.length > 1) {
36 requestAnimationFrame(step1); 66 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 58);
37 }); 67 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 158);
68 shouldBeEqualToNumber("entries[1].boundingClientRect.top", 258);
69 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 358);
70 shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
71 shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
72 shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
73 shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
74 shouldBeEqualToNumber("entries[1].rootBounds.left", 8);
75 shouldBeEqualToNumber("entries[1].rootBounds.right", 193);
76 shouldBeEqualToNumber("entries[1].rootBounds.top", 8);
77 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 208);
78 shouldEvaluateToSameObject("entries[1].target", target);
38 } 79 }
80 root.style.position = "static";
81 target.style.top = "10px";
82 requestAnimationFrame(step3);
83 }
39 84
40 function step1() { 85 function step3() {
41 setTimeout(function() { 86 entries = entries.concat(observer.takeRecords());
42 shouldBeEqualToNumber("entries.length", 1); 87 shouldBeEqualToNumber("entries.length", 2);
43 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 58); 88 target.style.top = "250px";
44 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 158); 89 requestAnimationFrame(step4);
45 shouldBeEqualToNumber("entries[0].boundingClientRect.top", 18); 90 }
46 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 118);
47 shouldBeEqualToNumber("entries[0].intersectionRect.left", 58);
48 shouldBeEqualToNumber("entries[0].intersectionRect.right", 158);
49 shouldBeEqualToNumber("entries[0].intersectionRect.top", 18);
50 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 118);
51 shouldBeEqualToNumber("entries[0].rootBounds.left", 8);
52 shouldBeEqualToNumber("entries[0].rootBounds.right", 193);
53 shouldBeEqualToNumber("entries[0].rootBounds.top", 8);
54 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 208);
55 shouldEvaluateToSameObject("entries[0].target", target);
56 target.style.top = "250px";
57 requestAnimationFrame(step2);
58 });
59 }
60 91
61 function step2() { 92 function step4() {
62 setTimeout(function() { 93 entries = entries.concat(observer.takeRecords());
63 shouldBeEqualToNumber("entries.length", 2); 94 shouldBeEqualToNumber("entries.length", 2);
64 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 58); 95 finishJSTest();
65 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 158); 96 }
66 shouldBeEqualToNumber("entries[1].boundingClientRect.top", 258);
67 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 358);
68 shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
69 shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
70 shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
71 shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
72 shouldBeEqualToNumber("entries[1].rootBounds.left", 8);
73 shouldBeEqualToNumber("entries[1].rootBounds.right", 193);
74 shouldBeEqualToNumber("entries[1].rootBounds.top", 8);
75 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 208);
76 shouldEvaluateToSameObject("entries[1].target", target);
77 root.style.position = "static";
78 target.style.top = "10px";
79 requestAnimationFrame(step3);
80 });
81 }
82
83 function step3() {
84 setTimeout(function() {
85 shouldBeEqualToNumber("entries.length", 2);
86 target.style.top = "250px";
87 requestAnimationFrame(step4);
88 });
89 }
90
91 function step4() {
92 setTimeout(function() {
93 shouldBeEqualToNumber("entries.length", 2);
94 finishJSTest();
95 });
96 }
97
98 step0();
99 </script> 97 </script>
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