| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>Monitoring the list of available presentation displays.</title> |
| <link rel="author" title="Tomoyuki Shimizu" href="https://github.com/tomoyukilabs"> |
| <link rel="help" href="http://w3c.github.io/presentation-api/#monitoring-the-list-of-available-presentation-displays"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="common.js"></script> |
| |
| <p id="notice">Please wait for a moment...</p> |
| <p>The test passes if a "PASS" result appears.<br></p> |
| |
| <script> |
| // prevent the default timeout |
| setup({explicit_timeout: true}); |
| |
| const notice = document.getElementById('notice'); |
| |
| promise_test(t => { |
| // clean up the instruction notice when the test ends |
| t.add_cleanup(() => { |
| notice.parentNode.removeChild(notice); |
| }); |
| |
| // initialize a presentation request |
| const request = new PresentationRequest(presentationUrls); |
| |
| let availability, previousState, timeout; |
| |
| const wait = () => { |
| notice.textContent = 'Please wait for a moment... (It might take long time)'; |
| |
| // set timeout to observe the presentation availability |
| timeout = t.step_timeout(function() { |
| t.force_timeout(); |
| t.done(); |
| }, 90000); |
| }; |
| |
| const setup = () => { |
| // save the current value of the presentation availability |
| previousState = availability.value; |
| |
| // show an instruction notice |
| notice.textContent = 'Please make your presentation displays ' |
| + (previousState ? 'unavailable' : 'available') |
| + ' and click this button: '; |
| const button = document.createElement('button'); |
| button.textContent = 'Start Monitoring'; |
| button.onclick = wait; |
| notice.appendChild(button); |
| }; |
| |
| // check the event and its attributes |
| const checkEvent = evt => { |
| clearTimeout(timeout); |
| timeout = undefined; |
| |
| assert_true(evt.isTrusted && !evt.bubbles && !evt.cancelable && evt instanceof Event, 'A simple event is fired.'); |
| assert_equals(evt.type, 'change', 'The event name is "change".'); |
| assert_equals(evt.target, availability, 'event.target is the presentation availability.'); |
| assert_not_equals(previousState, availability.value, 'Value of the presentation availability is changed.'); |
| setup(); |
| }; |
| |
| const watchEvent = (obj, watcher, type) => { |
| const watchHandler = new Promise(resolve => { |
| obj['on' + type] = evt => { resolve(evt); }; |
| }); |
| return Promise.all([ watchHandler, watcher.wait_for(type) ]).then(results => { |
| assert_equals(results[0], results[1], 'Both on' + type + ' and addEventListener pass the same event object.'); |
| return results[0]; |
| }); |
| }; |
| |
| // check the change of PresentationAvailability.value twice; "true to false" and "false to true" |
| return request.getAvailability().then(a => { |
| availability = a; |
| setup(); |
| |
| // wait until a "change" event is fired twice |
| var eventWatcher = new EventWatcher(t, availability, 'change'); |
| return watchEvent(availability, eventWatcher, 'change') |
| .then(checkEvent) |
| .then(() => { return eventWatcher.wait_for('change'); }) |
| .then(checkEvent); |
| }); |
| }); |
| </script> |
