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/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
XPCOMUtils.defineLazyGetter(this, "docShell", () => {
return window.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebNavigation)
.QueryInterface(Ci.nsIDocShell);
});
const EXPECTED_REFLOWS = [
// tabbrowser.adjustTabstrip() call after tabopen animation has finished
"adjustTabstrip@chrome://browser/content/tabbrowser.xml|" +
"_handleNewTab@chrome://browser/content/tabbrowser.xml|" +
"onxbltransitionend@chrome://browser/content/tabbrowser.xml|",
// switching focus in updateCurrentBrowser() causes reflows
"updateCurrentBrowser@chrome://browser/content/tabbrowser.xml|" +
"onselect@chrome://browser/content/browser.xul|",
// switching focus in openLinkIn() causes reflows
"openLinkIn@chrome://browser/content/utilityOverlay.js|" +
"openUILinkIn@chrome://browser/content/utilityOverlay.js|" +
"BrowserOpenTab@chrome://browser/content/browser.js|",
// accessing element.scrollPosition in _fillTrailingGap() flushes layout
"get_scrollPosition@chrome://global/content/bindings/scrollbox.xml|" +
"_fillTrailingGap@chrome://browser/content/tabbrowser.xml|" +
"_handleNewTab@chrome://browser/content/tabbrowser.xml|" +
"onxbltransitionend@chrome://browser/content/tabbrowser.xml|",
// The TabView iframe causes reflows in the parent document.
"iQClass_height@chrome://browser/content/tabview.js|" +
"GroupItem_getContentBounds@chrome://browser/content/tabview.js|" +
"GroupItem_shouldStack@chrome://browser/content/tabview.js|" +
"GroupItem_arrange@chrome://browser/content/tabview.js|" +
"GroupItem_add@chrome://browser/content/tabview.js|" +
"GroupItems_newTab@chrome://browser/content/tabview.js|" +
"TabItem__reconnect@chrome://browser/content/tabview.js|" +
"TabItem@chrome://browser/content/tabview.js|" +
"TabItems_link@chrome://browser/content/tabview.js|" +
"@chrome://browser/content/tabview.js|" +
"addTab@chrome://browser/content/tabbrowser.xml|",
// SessionStore.getWindowDimensions()
"ssi_getWindowDimension@resource:///modules/sessionstore/SessionStore.jsm|" +
"@resource:///modules/sessionstore/SessionStore.jsm|" +
"ssi_updateWindowFeatures@resource:///modules/sessionstore/SessionStore.jsm|" +
"ssi_collectWindowData@resource:///modules/sessionstore/SessionStore.jsm|" +
"@resource:///modules/sessionstore/SessionStore.jsm|" +
"ssi_forEachBrowserWindow@resource:///modules/sessionstore/SessionStore.jsm|" +
"ssi_getCurrentState@resource:///modules/sessionstore/SessionStore.jsm|" +
"ssi_saveState@resource:///modules/sessionstore/SessionStore.jsm|" +
"ssi_onTimerCallback@resource:///modules/sessionstore/SessionStore.jsm|" +
"ssi_observe@resource:///modules/sessionstore/SessionStore.jsm|",
// tabPreviews.capture()
"tabPreviews_capture@chrome://browser/content/browser.js|" +
"tabPreviews_handleEvent/<@chrome://browser/content/browser.js|"
];
const PREF_PRELOAD = "browser.newtab.preload";
/*
* This test ensures that there are no unexpected
* uninterruptible reflows when opening new tabs.
*/
function test() {
waitForExplicitFinish();
Services.prefs.setBoolPref(PREF_PRELOAD, false);
registerCleanupFunction(() => Services.prefs.clearUserPref(PREF_PRELOAD));
// Add a reflow observer and open a new tab.
docShell.addWeakReflowObserver(observer);
BrowserOpenTab();
// Wait until the tabopen animation has finished.
waitForTransitionEnd(function () {
// Remove reflow observer and clean up.
docShell.removeWeakReflowObserver(observer);
gBrowser.removeCurrentTab();
finish();
});
}
let observer = {
reflow: function (start, end) {
// Gather information about the current code path.
let path = (new Error().stack).split("\n").slice(1).map(line => {
return line.replace(/:\d+$/, "");
}).join("|");
// Stack trace is empty. Reflow was triggered by native code.
if (path === "") {
return;
}
// Check if this is an expected reflow.
for (let stack of EXPECTED_REFLOWS) {
if (path.startsWith(stack)) {
ok(true, "expected uninterruptible reflow '" + stack + "'");
return;
}
}
ok(false, "unexpected uninterruptible reflow '" + path + "'");
},
reflowInterruptible: function (start, end) {
// We're not interested in interruptible reflows.
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIReflowObserver,
Ci.nsISupportsWeakReference])
};
function waitForTransitionEnd(callback) {
let tab = gBrowser.selectedTab;
tab.addEventListener("transitionend", function onEnd(event) {
if (event.propertyName === "max-width") {
tab.removeEventListener("transitionend", onEnd);
executeSoon(callback);
}
});
}
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