function instancesOfObserversAreSharedBetweenWindows() {
info("Checking that when requesting twice an instances of the observer " +
"for the same TabActor, the instance is shared");
info("Checking 2 instances of the observer for the tabActor 1");
let tabActor1 = new MockTabActor();
let obs11 = getLayoutChangesObserver(tabActor1);
let obs12 = getLayoutChangesObserver(tabActor1);
Assert.equal(obs11, obs12);
info("Checking 2 instances of the observer for the tabActor 2");
let tabActor2 = new MockTabActor();
let obs21 = getLayoutChangesObserver(tabActor2);
let obs22 = getLayoutChangesObserver(tabActor2);
Assert.equal(obs21, obs22);
info("Checking that observers instances for 2 different tabActors are " +
"different");
Assert.notEqual(obs11, obs21);
releaseLayoutChangesObserver(tabActor1);
releaseLayoutChangesObserver(tabActor1);
releaseLayoutChangesObserver(tabActor2);
releaseLayoutChangesObserver(tabActor2);
}
function reflowsArentStackedWhenStopped() {
info("Checking that when stopped, reflows aren't stacked in the observer");
let tabActor = new MockTabActor();
let observer = getLayoutChangesObserver(tabActor);
info("Stoping the observer");
observer.stop();
info("Faking reflows");
tabActor.window.docShell.observer.reflow();
tabActor.window.docShell.observer.reflow();
tabActor.window.docShell.observer.reflow();
info("Checking that reflows aren't recorded");
Assert.equal(observer.reflows.length, 0);
info("Starting the observer and faking more reflows");
observer.start();
tabActor.window.docShell.observer.reflow();
tabActor.window.docShell.observer.reflow();
tabActor.window.docShell.observer.reflow();
info("Checking that reflows are recorded");
Assert.equal(observer.reflows.length, 3);
releaseLayoutChangesObserver(tabActor);
}
function destroyStopsObserving() {
info("Checking that the destroying the observer stops it");
let tabActor = new MockTabActor();
let observer = getLayoutChangesObserver(tabActor);
Assert.ok(observer.isObserving);
observer.destroy();
Assert.ok(!observer.isObserving);
releaseLayoutChangesObserver(tabActor);
}
function observerIsAlreadyStarted() {
info("Checking that the observer is already started when getting it");
let tabActor = new MockTabActor();
let observer = getLayoutChangesObserver(tabActor);
Assert.ok(observer.isObserving);
observer.stop();
Assert.ok(!observer.isObserving);
observer.start();
Assert.ok(observer.isObserving);
releaseLayoutChangesObserver(tabActor);
}
function eventsAreBatched() {
info("Checking that reflow events are batched and only sent when the " +
"timeout expires");
// Note that in this test, we mock the TabActor and its window property, so we
// also mock the setTimeout/clearTimeout mechanism and just call the callback
// manually
let tabActor = new MockTabActor();
let observer = getLayoutChangesObserver(tabActor);
let reflowsEvents = [];
let onReflows = (event, reflows) => reflowsEvents.push(reflows);
observer.on("reflows", onReflows);
let resizeEvents = [];
let onResize = () => resizeEvents.push("resize");
observer.on("resize", onResize);
info("Fake one reflow event");
tabActor.window.docShell.observer.reflow();
info("Checking that no batched reflow event has been emitted");
Assert.equal(reflowsEvents.length, 0);
info("Fake another reflow event");
tabActor.window.docShell.observer.reflow();
info("Checking that still no batched reflow event has been emitted");
Assert.equal(reflowsEvents.length, 0);
info("Fake a few of resize events too");
tabActor.window.docShell.mockResize();
tabActor.window.docShell.mockResize();
tabActor.window.docShell.mockResize();
info("Checking that still no batched resize event has been emitted");
Assert.equal(resizeEvents.length, 0);
info("Faking timeout expiration and checking that events are sent");
observer.eventLoopTimer();
Assert.equal(reflowsEvents.length, 1);
Assert.equal(reflowsEvents[0].length, 2);
Assert.equal(resizeEvents.length, 1);
observer.off("reflows", onReflows);
observer.off("resize", onResize);
releaseLayoutChangesObserver(tabActor);
}
function noEventsAreSentWhenThereAreNoReflowsAndLoopTimeouts() {
info("Checking that if no reflows were detected and the event batching " +
"loop expires, then no reflows event is sent");
let tabActor = new MockTabActor();
let observer = getLayoutChangesObserver(tabActor);
let reflowsEvents = [];
let onReflows = (event, reflows) => reflowsEvents.push(reflows);
observer.on("reflows", onReflows);
info("Faking timeout expiration and checking for reflows");
observer.eventLoopTimer();
Assert.equal(reflowsEvents.length, 0);
observer.off("reflows", onReflows);
releaseLayoutChangesObserver(tabActor);
}
function stoppingAndStartingSeveralTimesWorksCorrectly() {
info("Checking that the stopping and starting several times the observer" +
" works correctly");
let tabActor = new MockTabActor();
let observer = getLayoutChangesObserver(tabActor);
Assert.ok(observer.isObserving);
observer.start();
observer.start();
observer.start();
Assert.ok(observer.isObserving);
observer.stop();
Assert.ok(!observer.isObserving);
observer.stop();
observer.stop();
Assert.ok(!observer.isObserving);
releaseLayoutChangesObserver(tabActor);
}
function stackedReflowsAreResetOnStop() {
info("Checking that stacked reflows are reset on stop");
let tabActor = new MockTabActor();
let observer = getLayoutChangesObserver(tabActor);
tabActor.window.docShell.observer.reflow();
Assert.equal(observer.reflows.length, 1);
observer.stop();
Assert.equal(observer.reflows.length, 0);
tabActor.window.docShell.observer.reflow();
Assert.equal(observer.reflows.length, 0);
observer.start();
Assert.equal(observer.reflows.length, 0);
tabActor.window.docShell.observer.reflow();
Assert.equal(observer.reflows.length, 1);
releaseLayoutChangesObserver(tabActor);
}