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Test Info:
- Manifest: docshell/test/chrome/chrome.toml
<?xml version="1.0"?>
<!--
-->
<!-- test code goes here -->
<script type="application/javascript">
<![CDATA[
SimpleTest.waitForExplicitFinish();
var iter = runTests();
nextTest();
function* runTests() {
var iframe = document.createXULElement("iframe");
iframe.style.width = "300px";
iframe.style.height = "300px";
iframe.setAttribute("src", "data:text/html,<h1 id='h'>hello</h1>");
document.documentElement.appendChild(iframe);
yield whenLoaded(iframe);
info("iframe loaded");
var h1 = iframe.contentDocument.getElementById("h");
let myCallback = function() { h1.style.width = "400px"; };
info("Calling waitForInterruptibleReflow");
yield waitForInterruptibleReflow(iframe.docShell, myCallback);
info("got past top-level waitForInterruptibleReflow");
myCallback = function() { h1.style.width = "300px"; };
info("Calling waitForReflow");
waitForReflow(iframe.docShell, myCallback);
info("got past top-level waitForReflow");
yield is(300, h1.offsetWidth, "h1 has correct width");
SimpleTest.finish();
}
function waitForInterruptibleReflow(docShell,
callbackThatShouldTriggerReflow) {
waitForReflow(docShell, callbackThatShouldTriggerReflow, true);
}
function waitForReflow(docShell, callbackThatShouldTriggerReflow,
interruptible = false) {
info("Entering waitForReflow");
function done() {
info("Entering done (inside of waitForReflow)");
docShell.removeWeakReflowObserver(observer);
SimpleTest.executeSoon(nextTest);
}
var observer = {
reflow (start, end) {
info("Entering observer.reflow");
if (interruptible) {
ok(false, "expected interruptible reflow");
} else {
ok(true, "observed uninterruptible reflow");
}
info("times: " + start + ", " + end);
ok(start <= end, "reflow start time lower than end time");
done();
},
reflowInterruptible (start, end) {
info("Entering observer.reflowInterruptible");
if (!interruptible) {
ok(false, "expected uninterruptible reflow");
} else {
ok(true, "observed interruptible reflow");
}
info("times: " + start + ", " + end);
ok(start <= end, "reflow start time lower than end time");
done();
},
QueryInterface: ChromeUtils.generateQI([
"nsIReflowObserver",
"nsISupportsWeakReference",
]),
};
info("waitForReflow is adding a reflow observer");
docShell.addWeakReflowObserver(observer);
callbackThatShouldTriggerReflow();
}
function whenLoaded(iframe) {
info("entering whenLoaded");
iframe.addEventListener("load", function() {
SimpleTest.executeSoon(nextTest);
}, { once: true });
}
function nextTest() {
info("entering nextTest");
iter.next();
}
]]>
</script>
<!-- test results are displayed in the html:body -->
</body>
</window>