The Tor Browser: browser/base/content/test/general/browser_windowopen_reflows.js@6474c204b198 (annotated)

browser/base/content/test/general/browser_windowopen_reflows.js@6474c204b198 (annotated)

browser/base/content/test/general/browser_windowopen_reflows.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 "use strict";
 const EXPECTED_REFLOWS = [
   // handleEvent flushes layout to get the tabstrip width after a resize.
   "handleEvent@chrome://browser/content/tabbrowser.xml|",
   // Loading a tab causes a reflow.
   "loadTabs@chrome://browser/content/tabbrowser.xml|" +
     "loadOneOrMoreURIs@chrome://browser/content/browser.js|" +
     "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|",
   // Selecting the address bar causes a reflow.
   "select@chrome://global/content/bindings/textbox.xml|" +
     "focusAndSelectUrlBar@chrome://browser/content/browser.js|" +
     "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|",
   // Focusing the content area causes a reflow.
   "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|",
   // Sometimes sessionstore collects data during this test, which causes a sync reflow
   // (https://bugzilla.mozilla.org/show_bug.cgi?id=892154 will fix this)
   "ssi_getWindowDimension@resource:///modules/sessionstore/SessionStore.jsm",
 ];
 if (Services.appinfo.OS == "WINNT" || Services.appinfo.OS == "Darwin") {
   // TabsInTitlebar._update causes a reflow on OS X and Windows trying to do calculations
   // since layout info is already dirty. This doesn't seem to happen before
   // MozAfterPaint on Linux.
   EXPECTED_REFLOWS.push("rect@chrome://browser/content/browser.js|" +
                           "TabsInTitlebar._update@chrome://browser/content/browser.js|" +
                           "updateAppearance@chrome://browser/content/browser.js|" +
                           "handleEvent@chrome://browser/content/tabbrowser.xml|");
 }
 if (Services.appinfo.OS == "Darwin") {
   // _onOverflow causes a reflow getting widths.
   EXPECTED_REFLOWS.push("OverflowableToolbar.prototype._onOverflow@resource:///modules/CustomizableUI.jsm|" +
                         "OverflowableToolbar.prototype.init@resource:///modules/CustomizableUI.jsm|" +
                         "OverflowableToolbar.prototype.observe@resource:///modules/CustomizableUI.jsm|" +
                         "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|");
   // Same as above since in packaged builds there are no function names and the resource URI includes "app"
   EXPECTED_REFLOWS.push("@resource://app/modules/CustomizableUI.jsm|" +
                           "@resource://app/modules/CustomizableUI.jsm|" +
                           "@resource://app/modules/CustomizableUI.jsm|" +
                           "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|");
 }
 /*
  * This test ensures that there are no unexpected
  * uninterruptible reflows when opening new windows.
  */
 function test() {
   waitForExplicitFinish();
   // Add a reflow observer and open a new window
   let win = OpenBrowserWindow();
   let docShell = win.QueryInterface(Ci.nsIInterfaceRequestor)
                     .getInterface(Ci.nsIWebNavigation)
                     .QueryInterface(Ci.nsIDocShell);
   docShell.addWeakReflowObserver(observer);
   // Wait until the mozafterpaint event occurs.
   waitForMozAfterPaint(win, function paintListener() {
     // Remove reflow observer and clean up.
     docShell.removeWeakReflowObserver(observer);
     win.close();
     finish();
   });
 }
 let observer = {
   reflow: function (start, end) {
     // Gather information about the current code path.
     let stack = new Error().stack;
     let path = stack.split("\n").slice(1).map(line => {
       return line.replace(/:\d+:\d+$/, "");
     }).join("|");
     let pathWithLineNumbers = (new Error().stack).split("\n").slice(1).join("|");
     // Stack trace is empty. Reflow was triggered by native code.
     if (path === "") {
       return;
     }
     // Check if this is an expected reflow.
     for (let expectedStack of EXPECTED_REFLOWS) {
       if (path.startsWith(expectedStack) ||
           // Accept an empty function name for gBrowserInit._delayedStartup or TabsInTitlebar._update to workaround bug 906578.
           path.startsWith(expectedStack.replace(/(^|\|)(gBrowserInit\._delayedStartup|TabsInTitlebar\._update)@/, "$1@"))) {
         ok(true, "expected uninterruptible reflow '" + expectedStack + "'");
         return;
       }
     }
     ok(false, "unexpected uninterruptible reflow '" + pathWithLineNumbers + "'");
   },
   reflowInterruptible: function (start, end) {
     // We're not interested in interruptible reflows.
   },
   QueryInterface: XPCOMUtils.generateQI([Ci.nsIReflowObserver,
                                          Ci.nsISupportsWeakReference])
 };
 function waitForMozAfterPaint(win, callback) {
   win.addEventListener("MozAfterPaint", function onEnd(event) {
     if (event.target != win)
       return;
     win.removeEventListener("MozAfterPaint", onEnd);
     executeSoon(callback);
   });
 }