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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 <div style="width:100%; height:700px;"></div> 4 <div style="width:100%; height:700px;"></div>
5 <iframe id="target-iframe" src="../resources/intersection-observer-subframe.html " style="height: 100px; overflow-y: scroll"></iframe> 5 <iframe id="target-iframe" src="../resources/intersection-observer-subframe.html " style="height: 100px; overflow-y: scroll"></iframe>
6 <div style="width:100%; height:700px;"></div> 6 <div style="width:100%; height:700px;"></div>
7 7
8 <script> 8 <script>
9 description("Simple intersection observer test with no explicit root and target in an iframe."); 9 description("Simple intersection observer test with no explicit root and target in an iframe.");
10 var entries = []; 10 var entries = [];
11 var observer = new IntersectionObserver(changes => { entries = entries.concat(ch anges) }, {});
11 var targetIframe = document.getElementById("target-iframe"); 12 var targetIframe = document.getElementById("target-iframe");
13 var target;
14 var iframeScroller;
12 15
13 targetIframe.onload = function() { 16 targetIframe.onload = function() {
14 var target = targetIframe.contentDocument.getElementById("target"); 17 target = targetIframe.contentDocument.getElementById("target");
15 var iframeScroller = targetIframe.contentDocument.scrollingElement; 18 iframeScroller = targetIframe.contentDocument.scrollingElement;
19 observer.observe(target);
20 entries = entries.concat(observer.takeRecords());
21 shouldBeEqualToNumber("entries.length", 0);
22 // See README for explanation of double RAF.
23 requestAnimationFrame(() => { requestAnimationFrame(step0) });
24 }
16 25
17 observer_callback = function(changes) { 26 function step0() {
18 for (var i in changes) 27 entries = entries.concat(observer.takeRecords());
19 entries.push(changes[i]); 28 shouldBeEqualToNumber("entries.length", 0);
20 }; 29 document.scrollingElement.scrollTop = 200;
21 var observer = new IntersectionObserver(observer_callback, {}); 30 requestAnimationFrame(step1);
22 observer.observe(target); 31 }
23 32
24 function step0() { 33 function step1() {
25 setTimeout(function() { 34 entries = entries.concat(observer.takeRecords());
26 shouldBeEqualToNumber("entries.length", 0); 35 shouldBeEqualToNumber("entries.length", 0);
27 document.scrollingElement.scrollTop = 200; 36 iframeScroller.scrollTop = 250;
28 requestAnimationFrame(step1); 37 requestAnimationFrame(step2);
29 }); 38 }
39
40 function step2() {
41 entries = entries.concat(observer.takeRecords());
42 shouldBeEqualToNumber("entries.length", 1);
43 if (entries.length > 0) {
44 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 8);
45 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 108);
46 shouldBeEqualToNumber("entries[0].boundingClientRect.top", -42);
47 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 58);
48 shouldBeEqualToNumber("entries[0].intersectionRect.left", 8);
49 shouldBeEqualToNumber("entries[0].intersectionRect.right", 108);
50 shouldBeEqualToNumber("entries[0].intersectionRect.top", 0);
51 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 58);
52 shouldBeEqualToNumber("entries[0].rootBounds.left", 0);
53 shouldBeEqualToNumber("entries[0].rootBounds.right", 785);
54 shouldBeEqualToNumber("entries[0].rootBounds.top", 0);
55 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 600);
56 shouldEvaluateToSameObject("entries[0].target", target);
30 } 57 }
58 document.scrollingElement.scrollTop = 100;
59 requestAnimationFrame(step3);
60 }
31 61
32 function step1() { 62 function step3() {
33 setTimeout(function() { 63 entries = entries.concat(observer.takeRecords());
34 shouldBeEqualToNumber("entries.length", 0); 64 shouldBeEqualToNumber("entries.length", 2);
35 iframeScroller.scrollTop = 250; 65 if (entries.length > 1) {
36 requestAnimationFrame(step2); 66 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 8);
37 }); 67 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 108);
68 shouldBeEqualToNumber("entries[1].boundingClientRect.top", -42);
69 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 58);
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", 0);
75 shouldBeEqualToNumber("entries[1].rootBounds.right", 785);
76 shouldBeEqualToNumber("entries[1].rootBounds.top", 0);
77 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 600);
78 shouldEvaluateToSameObject("entries[1].target", target);
38 } 79 }
39 80 finishJSTest();
40 function step2() { 81 document.scrollingElement.scrollTop = 0;
41 setTimeout(function() {
42 shouldBeEqualToNumber("entries.length", 1);
43 if (entries.length > 0) {
44 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 8);
45 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 108);
46 shouldBeEqualToNumber("entries[0].boundingClientRect.top", -42);
47 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 58);
48 shouldBeEqualToNumber("entries[0].intersectionRect.left", 8);
49 shouldBeEqualToNumber("entries[0].intersectionRect.right", 108);
50 shouldBeEqualToNumber("entries[0].intersectionRect.top", 0);
51 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 58);
52 shouldBeEqualToNumber("entries[0].rootBounds.left", 0);
53 shouldBeEqualToNumber("entries[0].rootBounds.right", 785);
54 shouldBeEqualToNumber("entries[0].rootBounds.top", 0);
55 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 600);
56 shouldEvaluateToSameObject("entries[0].target", target);
57 }
58 document.scrollingElement.scrollTop = 100;
59 requestAnimationFrame(step3);
60 });
61 }
62
63 function step3() {
64 setTimeout(function() {
65 shouldBeEqualToNumber("entries.length", 2);
66 if (entries.length > 1) {
67 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 8);
68 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 108);
69 shouldBeEqualToNumber("entries[1].boundingClientRect.top", -42);
70 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 58);
71 shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
72 shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
73 shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
74 shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
75 shouldBeEqualToNumber("entries[1].rootBounds.left", 0);
76 shouldBeEqualToNumber("entries[1].rootBounds.right", 785);
77 shouldBeEqualToNumber("entries[1].rootBounds.top", 0);
78 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 600);
79 shouldEvaluateToSameObject("entries[1].target", target);
80 }
81 finishJSTest();
82 document.scrollingElement.scrollTop = 0;
83 });
84 }
85
86 step0();
87 } 82 }
88 </script> 83 </script>
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