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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/webxr_util.js"></script>
<script src="resources/webxr_test_constants.js"></script>
<script>
let testName = "Ensures that the XRSession's visibilityState is correctly "
+ "reported and that the associated visibilitychange event fires.";
let watcherDone = new Event("watcherdone");
let frameFired = new Event("framefired");
let fakeDeviceInitParams = TRACKED_IMMERSIVE_DEVICE;
let testFunction = function(session, fakeDeviceController, t) {
let eventWatcher = new EventWatcher(
t, session, ["visibilitychange", "framefired", "watcherdone"]);
let eventPromise = eventWatcher.wait_for(
["visibilitychange", "visibilitychange", "framefired", "watcherdone"]);
function onFrame(timestamp, frame) {
t.step( () => {
// The session should not fire any animation frames while the visibility
// state is hidden.
assert_not_equals(session.visibilityState, "hidden");
});
// Make sure the frame does fire when the visibility is changed back to "visible"
session.dispatchEvent(frameFired);
}
function onSessionVisibilityChangeHidden(event) {
t.step( () => {
assert_equals(session.visibilityState, "hidden");
});
session.removeEventListener("visibilitychange", onSessionVisibilityChangeHidden, false);
session.addEventListener("visibilitychange", onSessionVisibilityChangeVisible, false);
session.requestAnimationFrame(onFrame)
t.step_timeout(() => {
fakeDeviceController.simulateVisibilityChange("visible");
}, 300);
}
function onSessionVisibilityChangeVisible(event) {
t.step( () => {
assert_equals(session.visibilityState, "visible");
});
session.removeEventListener("visibilitychange", onSessionVisibilityChangeVisible, false);
session.addEventListener("visibilitychange", onSessionVisibilityChangeInvalid, false);
fakeDeviceController.simulateVisibilityChange("visible");
t.step_timeout(() => {
session.dispatchEvent(watcherDone);
}, 300);
}
function onSessionVisibilityChangeInvalid(event) {
t.step( () => {
assert_not_reached("Should not fire visibilitychange events for the same state");
});
}
t.step( () => {
// Session visibility should start out as "visible"
assert_equals(session.visibilityState, "visible");
});
session.addEventListener("visibilitychange", onSessionVisibilityChangeHidden, false);
fakeDeviceController.simulateVisibilityChange("hidden");
return eventPromise;
};
xr_session_promise_test(
testName, testFunction, fakeDeviceInitParams, 'immersive-vr');
</script>
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