| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <meta name="flags" content="dom"> |
| <title>CSS Test: CSSOM View MediaQueryList::addListener with handleEvent</title> |
| <link rel="help" href="https://dom.spec.whatwg.org/#callbackdef-eventlistener"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/matchMedia.js"></script> |
| <div id="log"></div> |
| <script> |
| "use strict"; |
| setup({ allow_uncaught_exception: true }); |
| |
| promise_test(async t => { |
| const mql = await createMQL(t); |
| |
| let _this; |
| let _event; |
| const listener = { |
| handleEvent(event) { |
| _this = this; |
| _event = event; |
| }, |
| }; |
| |
| mql.addListener(listener); |
| triggerMQLEvent(mql); |
| await waitForChangesReported(); |
| |
| assert_equals(_this, listener); |
| assert_equals(_event.media, mql.media); |
| assert_equals(_event.matches, mql.matches); |
| }, "calls handleEvent method of event listener"); |
| |
| promise_test(async t => { |
| const mql = await createMQL(t); |
| |
| let calls = 0; |
| mql.addListener({ |
| get handleEvent() { |
| calls++; |
| return function() {}; |
| }, |
| }); |
| assert_equals(calls, 0); |
| |
| triggerMQLEvent(mql); |
| await waitForChangesReported(); |
| assert_equals(calls, 1); |
| |
| triggerMQLEvent(mql); |
| await waitForChangesReported(); |
| assert_equals(calls, 2); |
| }, "looks up handleEvent method on every event dispatch"); |
| |
| promise_test(async t => { |
| const mql = await createMQL(t); |
| |
| let calls = 0; |
| const listener = () => { |
| calls++; |
| }; |
| |
| Object.defineProperty(listener, "handleEvent", { |
| get: t.unreached_func("handleEvent method should not be looked up on functions"), |
| }); |
| mql.addListener(listener); |
| |
| triggerMQLEvent(mql); |
| await waitForChangesReported(); |
| assert_equals(calls, 1); |
| }, "doesn't look up handleEvent method on callable event listeners"); |
| |
| const uncaught_error_test = async (t, mql, getHandleEvent) => { |
| const eventWatcher = new EventWatcher(t, window, "error", waitForChangesReported); |
| const errorPromise = eventWatcher.wait_for("error"); |
| |
| let calls = 0; |
| const listener = { |
| get handleEvent() { |
| calls++; |
| return getHandleEvent(); |
| }, |
| }; |
| |
| try { |
| mql.addListener(listener); |
| triggerMQLEvent(mql); |
| |
| const event = await errorPromise; |
| throw event.error; |
| } finally { |
| assert_equals(calls, 1, "handleEvent property was not looked up"); |
| } |
| }; |
| |
| promise_test(async t => { |
| const error = { name: "test" }; |
| const mql = await createMQL(t); |
| |
| return promise_rejects_exactly(t, error, |
| uncaught_error_test(t, mql, () => { throw error; })); |
| }, "rethrows errors when getting handleEvent"); |
| |
| promise_test(async t => { |
| const mql = await createMQL(t); |
| const global = getWindow(mql); |
| return promise_rejects_js(t, global.TypeError, |
| uncaught_error_test(t, mql, () => false)); |
| }, "throws if handleEvent is falsy and not callable"); |
| |
| promise_test(async t => { |
| const mql = await createMQL(t); |
| const global = getWindow(mql); |
| return promise_rejects_js(t, global.TypeError, |
| uncaught_error_test(t, mql, () => "str")); |
| }, "throws if handleEvent is thruthy and not callable"); |
| </script> |
