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Issue 1806133002: IntersectionObserver: use an idle callback to send notifications. (Closed) Base URL: https://chromium.googlesource.com/chromium/src@master
Patch Set: rebase Created 4 years, 8 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 <div style="width:100%; height:700px;"></div> 4 <div style="width:100%; height:700px;"></div>
5 <div id="root" style="display: inline-block; overflow-y: scroll; height: 200px; border: 3px solid black"> 5 <div id="root" style="display: inline-block; overflow-y: scroll; height: 200px; border: 3px solid black">
6 <div style="width:100px; height: 300px;"></div> 6 <div style="width:100px; height: 300px;"></div>
7 <div id="target" style="background-color: green; width:100px; height:100px"></ div> 7 <div id="target" style="background-color: green; width:100px; height:100px"></ div>
8 </div> 8 </div>
9 <div style="width:100%;height:700px;"></div> 9 <div style="width:100%;height:700px;"></div>
10 10
11 <script> 11 <script>
12 description("Simple intersection observer test with explicit root and target i n the same document."); 12 description("Simple intersection observer test with explicit root and target in the same document.");
13 var target = document.getElementById("target"); 13 var target = document.getElementById("target");
14 var root = document.getElementById("root"); 14 var root = document.getElementById("root");
15 var entries = []; 15 var entries = [];
16 var observer = new IntersectionObserver(
17 changes => { entries = entries.concat(changes) },
18 { root: document.getElementById("root") }
19 );
16 20
17 observer_callback = function(changes) { 21 onload = function() {
18 for (var i in changes)
19 entries.push(changes[i]);
20 };
21 var observer = new IntersectionObserver(observer_callback, {"root": document.g etElementById("root")});
22 observer.observe(target); 22 observer.observe(target);
23 entries = entries.concat(observer.takeRecords());
24 shouldBeEqualToNumber("entries.length", 0);
25 requestAnimationFrame(() => { requestAnimationFrame(step0) });
26 }
23 27
24 // Test that notifications are not generated when the target is overflow clipp ed by the root. 28 // Test that notifications are not generated when the target is overflow clipped by the root.
25 function step0() { 29 function step0() {
26 setTimeout(function() { 30 entries = entries.concat(observer.takeRecords());
27 shouldBeEqualToNumber("entries.length", 0); 31 shouldBeEqualToNumber("entries.length", 0);
28 document.scrollingElement.scrollTop = 600; 32 document.scrollingElement.scrollTop = 600;
29 requestAnimationFrame(step1); 33 requestAnimationFrame(step1);
30 }); 34 }
35
36 function step1() {
37 entries = entries.concat(observer.takeRecords());
38 shouldBeEqualToNumber("entries.length", 0);
39 root.scrollTop = 150;
40 requestAnimationFrame(step2);
41 }
42
43 function step2() {
44 entries = entries.concat(observer.takeRecords());
45 shouldBeEqualToNumber("entries.length", 1);
46 if (entries.length > 0) {
47 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 11);
48 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 111);
49 shouldBeEqualToNumber("entries[0].boundingClientRect.top", 261);
50 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 361);
51 shouldBeEqualToNumber("entries[0].intersectionRect.left", 11);
52 shouldBeEqualToNumber("entries[0].intersectionRect.right", 111);
53 shouldBeEqualToNumber("entries[0].intersectionRect.top", 261);
54 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 311);
55 shouldBeEqualToNumber("entries[0].rootBounds.left", 11);
56 shouldBeEqualToNumber("entries[0].rootBounds.right", 111);
57 shouldBeEqualToNumber("entries[0].rootBounds.top", 111);
58 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 311);
59 shouldEvaluateToSameObject("entries[0].target", target);
60 }
61 document.scrollingElement.scrollTop = 0;
62 requestAnimationFrame(step3);
63 }
64
65 function step3() {
66 entries = entries.concat(observer.takeRecords());
67 shouldBeEqualToNumber("entries.length", 1);
68 root.scrollTop = 0;
69 requestAnimationFrame(step4);
70 }
71
72 function step4() {
73 entries = entries.concat(observer.takeRecords());
74 shouldBeEqualToNumber("entries.length", 2);
75 if (entries.length > 1) {
76 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 11);
77 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 111);
78 shouldBeEqualToNumber("entries[1].boundingClientRect.top", 1011);
79 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 1111);
80 shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
81 shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
82 shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
83 shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
84 shouldBeEqualToNumber("entries[1].rootBounds.left", 11);
85 shouldBeEqualToNumber("entries[1].rootBounds.right", 111);
86 shouldBeEqualToNumber("entries[1].rootBounds.top", 711);
87 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 911);
88 shouldEvaluateToSameObject("entries[1].target", target);
89 }
90 root.scrollTop = 150;
91 requestAnimationFrame(step5);
92 }
93
94 // This tests that notifications are generated even when the root element is off screen.
95 function step5() {
96 entries = entries.concat(observer.takeRecords());
97 shouldBeEqualToNumber("entries.length", 3);
98 if (entries.length > 2) {
99 shouldBeEqualToNumber("entries[2].boundingClientRect.left", 11);
100 shouldBeEqualToNumber("entries[2].boundingClientRect.right", 111);
101 shouldBeEqualToNumber("entries[2].boundingClientRect.top", 861);
102 shouldBeEqualToNumber("entries[2].boundingClientRect.bottom", 961);
103 shouldBeEqualToNumber("entries[2].intersectionRect.left", 11);
104 shouldBeEqualToNumber("entries[2].intersectionRect.right", 111);
105 shouldBeEqualToNumber("entries[2].intersectionRect.top", 861);
106 shouldBeEqualToNumber("entries[2].intersectionRect.bottom", 911);
107 shouldBeEqualToNumber("entries[2].rootBounds.left", 11);
108 shouldBeEqualToNumber("entries[2].rootBounds.right", 111);
109 shouldBeEqualToNumber("entries[2].rootBounds.top", 711);
110 shouldBeEqualToNumber("entries[2].rootBounds.bottom", 911);
111 shouldEvaluateToSameObject("entries[2].target", target);
31 } 112 }
32 113
33 function step1() { 114 finishJSTest();
34 setTimeout(function() { 115 }
35 shouldBeEqualToNumber("entries.length", 0);
36 root.scrollTop = 150;
37 requestAnimationFrame(step2);
38 });
39 }
40
41 function step2() {
42 setTimeout(function() {
43 shouldBeEqualToNumber("entries.length", 1);
44 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 11);
45 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 111);
46 shouldBeEqualToNumber("entries[0].boundingClientRect.top", 261);
47 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 361);
48 shouldBeEqualToNumber("entries[0].intersectionRect.left", 11);
49 shouldBeEqualToNumber("entries[0].intersectionRect.right", 111);
50 shouldBeEqualToNumber("entries[0].intersectionRect.top", 261);
51 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 311);
52 shouldBeEqualToNumber("entries[0].rootBounds.left", 11);
53 shouldBeEqualToNumber("entries[0].rootBounds.right", 111);
54 shouldBeEqualToNumber("entries[0].rootBounds.top", 111);
55 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 311);
56 shouldEvaluateToSameObject("entries[0].target", target);
57 document.scrollingElement.scrollTop = 0;
58 requestAnimationFrame(step3);
59 });
60 }
61
62 function step3() {
63 setTimeout(function() {
64 shouldBeEqualToNumber("entries.length", 1);
65 root.scrollTop = 0;
66 requestAnimationFrame(step4);
67 });
68 }
69
70 function step4() {
71 setTimeout(function() {
72 shouldBeEqualToNumber("entries.length", 2);
73 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 11);
74 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 111);
75 shouldBeEqualToNumber("entries[1].boundingClientRect.top", 1011);
76 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 1111);
77 shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
78 shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
79 shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
80 shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
81 shouldBeEqualToNumber("entries[1].rootBounds.left", 11);
82 shouldBeEqualToNumber("entries[1].rootBounds.right", 111);
83 shouldBeEqualToNumber("entries[1].rootBounds.top", 711);
84 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 911);
85 shouldEvaluateToSameObject("entries[1].target", target);
86 root.scrollTop = 150;
87 requestAnimationFrame(step5);
88 });
89 }
90
91 // This tests that notifications are generated even when the root element is o ff screen.
92 function step5() {
93 setTimeout(function() {
94 shouldBeEqualToNumber("entries.length", 3);
95 shouldBeEqualToNumber("entries[2].boundingClientRect.left", 11);
96 shouldBeEqualToNumber("entries[2].boundingClientRect.right", 111);
97 shouldBeEqualToNumber("entries[2].boundingClientRect.top", 861);
98 shouldBeEqualToNumber("entries[2].boundingClientRect.bottom", 961);
99 shouldBeEqualToNumber("entries[2].intersectionRect.left", 11);
100 shouldBeEqualToNumber("entries[2].intersectionRect.right", 111);
101 shouldBeEqualToNumber("entries[2].intersectionRect.top", 861);
102 shouldBeEqualToNumber("entries[2].intersectionRect.bottom", 911);
103 shouldBeEqualToNumber("entries[2].rootBounds.left", 11);
104 shouldBeEqualToNumber("entries[2].rootBounds.right", 111);
105 shouldBeEqualToNumber("entries[2].rootBounds.top", 711);
106 shouldBeEqualToNumber("entries[2].rootBounds.bottom", 911);
107 shouldEvaluateToSameObject("entries[2].target", target);
108 finishJSTest();
109 });
110 }
111
112 step0();
113 </script> 116 </script>
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