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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="target" style="background-color: green; width:0px; height:0px"></div> 5 <div id="target" style="background-color: green; width:0px; height:0px"></div>
6 <div style="width:100%; height:700px;"></div> 6 <div style="width:100%; height:700px;"></div>
7 7
8 <script> 8 <script>
9 description("Iintersection observer test with zero-size target element."); 9 description("Intersection observer test with zero-size target element.");
10 var target = document.getElementById("target"); 10 var target = document.getElementById("target");
11 var entries = []; 11 var entries = [];
12 observer_callback = function(changes) { 12 var observer = new IntersectionObserver(changes => { entries = entries.concat(ch anges) }, {});
13 for (var i in changes) 13
14 entries.push(changes[i]); 14 onload = function() {
15 };
16 var observer = new IntersectionObserver(observer_callback, {});
17 observer.observe(target); 15 observer.observe(target);
16 entries.push(...observer.takeRecords());
17 shouldBeEqualToNumber("entries.length", 0);
18 document.scrollingElement.scrollTop = 300;
19 // See README for explanation of double RAF.
20 requestAnimationFrame(() => { requestAnimationFrame(step1) });
21 };
18 22
19 onload = function() { 23 function step1() {
20 shouldBeEqualToNumber("entries.length", 0); 24 entries.push(...observer.takeRecords());
21 document.scrollingElement.scrollTop = 300; 25 shouldBeEqualToNumber("entries.length", 1);
22 requestAnimationFrame(step1); 26 if (entries.length > 0) {
23 }; 27 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 8);
28 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 8);
29 shouldBeEqualToNumber("entries[0].boundingClientRect.top", 408);
30 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 408);
31 shouldBeEqualToNumber("entries[0].intersectionRect.left", 8);
32 shouldBeEqualToNumber("entries[0].intersectionRect.right", 8);
33 shouldBeEqualToNumber("entries[0].intersectionRect.top", 408);
34 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 408);
35 shouldBeEqualToNumber("entries[0].rootBounds.left", 0);
36 shouldBeEqualToNumber("entries[0].rootBounds.right", 785);
37 shouldBeEqualToNumber("entries[0].rootBounds.top", 0);
38 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 600);
39 shouldEvaluateToSameObject("entries[0].target", target);
24 40
25 function step1() { 41 // ClientRect members of IntersectionObserverEntry should be stable.
26 setTimeout(function() { 42 shouldEvaluateToSameObject("entries[0].boundingClientRect", entries[0].bound ingClientRect);
27 shouldBeEqualToNumber("entries.length", 1); 43 shouldEvaluateToSameObject("entries[0].intersectionRect", entries[0].interse ctionRect);
28 shouldBeEqualToNumber("entries[0].boundingClientRect.left", 8); 44 shouldEvaluateToSameObject("entries[0].rootBounds", entries[0].rootBounds);
29 shouldBeEqualToNumber("entries[0].boundingClientRect.right", 8); 45 }
30 shouldBeEqualToNumber("entries[0].boundingClientRect.top", 408); 46 document.scrollingElement.scrollTop = 100;
31 shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 408); 47 requestAnimationFrame(step2);
32 shouldBeEqualToNumber("entries[0].intersectionRect.left", 8); 48 }
33 shouldBeEqualToNumber("entries[0].intersectionRect.right", 8);
34 shouldBeEqualToNumber("entries[0].intersectionRect.top", 408);
35 shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 408);
36 shouldBeEqualToNumber("entries[0].rootBounds.left", 0);
37 shouldBeEqualToNumber("entries[0].rootBounds.right", 785);
38 shouldBeEqualToNumber("entries[0].rootBounds.top", 0);
39 shouldBeEqualToNumber("entries[0].rootBounds.bottom", 600);
40 shouldEvaluateToSameObject("entries[0].target", target);
41 49
42 // ClientRect members of IntersectionObserverEntry should be stable. 50 function step2() {
43 shouldEvaluateToSameObject("entries[0].boundingClientRect", entries[0].bou ndingClientRect); 51 entries.push(...observer.takeRecords());
44 shouldEvaluateToSameObject("entries[0].intersectionRect", entries[0].inter sectionRect); 52 shouldBeEqualToNumber("entries.length", 2);
45 shouldEvaluateToSameObject("entries[0].rootBounds", entries[0].rootBounds) ; 53 if (entries.length > 1) {
46 54 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 8);
47 document.scrollingElement.scrollTop = 100; 55 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 8);
48 requestAnimationFrame(step2); 56 shouldBeEqualToNumber("entries[1].boundingClientRect.top", 608);
49 }); 57 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 608);
58 shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
59 shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
60 shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
61 shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
62 shouldBeEqualToNumber("entries[1].rootBounds.left", 0);
63 shouldBeEqualToNumber("entries[1].rootBounds.right", 785);
64 shouldBeEqualToNumber("entries[1].rootBounds.top", 0);
65 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 600);
66 shouldEvaluateToSameObject("entries[1].target", target);
50 } 67 }
51 68 finishJSTest();
52 function step2() { 69 document.scrollingElement.scrollTop = 0;
53 setTimeout(function() { 70 }
54 shouldBeEqualToNumber("entries.length", 2);
55 shouldBeEqualToNumber("entries[1].boundingClientRect.left", 8);
56 shouldBeEqualToNumber("entries[1].boundingClientRect.right", 8);
57 shouldBeEqualToNumber("entries[1].boundingClientRect.top", 608);
58 shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 608);
59 shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
60 shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
61 shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
62 shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
63 shouldBeEqualToNumber("entries[1].rootBounds.left", 0);
64 shouldBeEqualToNumber("entries[1].rootBounds.right", 785);
65 shouldBeEqualToNumber("entries[1].rootBounds.top", 0);
66 shouldBeEqualToNumber("entries[1].rootBounds.bottom", 600);
67 shouldEvaluateToSameObject("entries[1].target", target);
68 finishJSTest();
69 document.scrollingElement.scrollTop = 0;
70 });
71 }
72
73 </script> 71 </script>
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