1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
<!DOCTYPE html>
<title>window.requestIdleCallback callback behavior during idle periods.</title>
<link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(function() {
// Check that if an idle callback calls requestIdleCallback, the new callback
// doesn't get the same deadline (i.e., runs in a new idle period).
var previous_deadline = undefined;
var idle_callbacks_remaining = 10;
var rIC = this.step_func(function(deadline) {
var now = performance.now();
var remaining = deadline.timeRemaining();
var new_deadline = now + remaining;
if (previous_deadline != undefined) {
assert_true(new_deadline > previous_deadline, "A requestIdleCallback scheduled during an idle period should be called back with a deadline greater than that in the current idle period.");
}
// Schedule a new requestIdleCallback.
if (--idle_callbacks_remaining > 0) {
previous_deadline = new_deadline;
requestIdleCallback(rIC);
} else {
this.done();
}
});
// Spin an empty rAF loop to cause an idle period each frame.
var idle_task_posted = false;
requestAnimationFrame(function rAFLoop() {
if (!idle_task_posted) {
requestIdleCallback(rIC);
idle_task_posted = true;
}
requestAnimationFrame(rAFLoop);
});
}, 'Check that if an idle callback calls requestIdleCallback the new callback doesn\'t run in the current idle period.');
</script>
<h1>Test of requestIdleCallback idle period behavior</h1>
<p>This test validates that window.requestIdleCallback deals with callbacks during idle periods correctly.</p>
<div id="log"></div>
|
