| <!DOCTYPE html> |
| <title>window.requestIdleCallback callback behavior during idle periods.</title> |
| <link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" /> |
| <link rel="help" href="http://www.w3.org/TR/requestidlecallback/"/> |
| <script src="../../../../resources/testharness.js"></script> |
| <script src="../../../../resources/testharnessreport.js"></script> |
| <link rel="stylesheet" href="../../../..//resources/testharness.css" /> |
| <script> |
| |
| async_test(function() { |
| // Check that two separate calls to requestIdleCallbacks can run in the same |
| // idle period. |
| var callback_1_deadline; |
| var callback_1_has_run = false; |
| var callback_1 = function(deadline) { |
| callback_1_has_run = true; |
| var remaining = deadline.timeRemaining(); |
| if (remaining >= 5) { |
| // Should be enough time to run the next callback in the current idle |
| // period. |
| callback_1_deadline = performance.now() + remaining; |
| } |
| }; |
| var callback_2 = this.step_func(function(deadline) { |
| assert_true(callback_1_has_run, "Should run callbacks in order of posting if they don't have a timeout."); |
| if (callback_1_deadline != undefined) { |
| assert_true(performance.now() < callback_1_deadline, "Should be able to run both callbacks in the same idle period."); |
| this.done(); |
| } else { |
| // Might not have had enough idle time, so try again. |
| callback_1_has_run = false; |
| setTimeout(function() { |
| requestIdleCallback(callback_1); |
| requestIdleCallback(callback_2); |
| }, 0); |
| } |
| }); |
| requestIdleCallback(callback_1); |
| requestIdleCallback(callback_2); |
| }, 'requestIdleCallback can run multiple different requestIdleCallback callbacks in the same idle period.'); |
| |
| async_test(function() { |
| // Check that if an idle callback calls requestIdleCallback the new callback |
| // doesn't run in the current idle period. |
| var previous_deadline; |
| var idle_callbacks_remaining = 10; |
| var self = this; |
| requestIdleCallback(this.step_func(function rIC(deadline) { |
| var remaining = deadline.timeRemaining(); |
| var now = performance.now(); |
| if (previous_deadline != undefined) { |
| assert_true(now >= previous_deadline, "A requestIdleCallback called during an idle period should not be run until the next idle period."); |
| } |
| |
| // Schedule a new requestIdleCallback. |
| if (--idle_callbacks_remaining > 0) { |
| previous_deadline = now + remaining; |
| requestIdleCallback(rIC); |
| } else { |
| self.done(); |
| } |
| })); |
| |
| // Spin an empty rAF loop to cause an idle period each frame. |
| requestAnimationFrame(this.step_func(function rAFLoop() { |
| requestAnimationFrame(rAFLoop); |
| })); |
| }, 'Check that if an idle callback calls requestIdleCallback the new callback doesn\'t run in the current idle period.'); |
| </script> |
| <h1>Description</h1> |
| <p>This test validates that window.requestIdleCallback deals with callbacks during idle periods correctly.</p> |
| <div id="log"></div> |
