tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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browser_test_paint_skip_in_popup.js (3899B)

      1 /* Any copyright is dedicated to the Public Domain.
      2 * http://creativecommons.org/publicdomain/zero/1.0/ */
      3 
      4 "use strict";
      5 
      6 Services.scriptloader.loadSubScript(
      7  "chrome://mochikit/content/tests/SimpleTest/paint_listener.js",
      8  this
      9 );
     10 
     11 Services.scriptloader.loadSubScript(
     12  new URL("apz_test_utils.js", gTestPath).href,
     13  this
     14 );
     15 
     16 /* import-globals-from helper_browser_test_utils.js */
     17 // For openSelectPopup.
     18 Services.scriptloader.loadSubScript(
     19  new URL("helper_browser_test_utils.js", gTestPath).href,
     20  this
     21 );
     22 
     23 // Cleanup for paint_listener.js.
     24 add_task(() => {
     25  registerCleanupFunction(() => {
     26    delete window.waitForAllPaintsFlushed;
     27    delete window.waitForAllPaints;
     28    delete window.promiseAllPaintsDone;
     29  });
     30 });
     31 
     32 // Setup preferences.
     33 add_task(async () => {
     34  await SpecialPowers.pushPrefEnv({
     35    set: [
     36      ["apz.popups.enabled", true],
     37      ["apz.popups_without_remote.enabled", true],
     38      ["apz.test.logging_enabled", true],
     39      ["layout.disable-pixel-alignment", true],
     40    ],
     41  });
     42 });
     43 
     44 add_task(async () => {
     45  function httpURL(filename) {
     46    let chromeURL = getRootDirectory(gTestPath) + filename;
     47    return chromeURL.replace(
     48      "chrome://mochitests/content/",
     49      "http://mochi.test:8888/"
     50    );
     51  }
     52  const url = httpURL("helper_paint_skip_in_popup.html");
     53  const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
     54 
     55  await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
     56    await content.wrappedJSObject.promiseApzFlushedRepaints();
     57    await content.wrappedJSObject.waitUntilApzStable();
     58  });
     59 
     60  // Focus to the select element. This stuff is necessary for `openSelectPopup()`
     61  // since the function is triggered on the focused element.
     62  await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
     63    const select = content.document.querySelector("select");
     64    const focusPromise = new Promise(resolve => {
     65      select.addEventListener("focus", resolve, { once: true });
     66    });
     67    select.focus();
     68    await focusPromise;
     69  });
     70 
     71  // Open the select popup.
     72  const selectPopup = await openSelectPopup();
     73 
     74  const arrowscrollbox = selectPopup.shadowRoot.querySelector("arrowscrollbox");
     75  ok(arrowscrollbox, "There's <arrowscrollbox> inside the popup");
     76 
     77  const scrollbox = arrowscrollbox.shadowRoot.querySelector("scrollbox");
     78  ok(scrollbox, "There's <scrollbox> inside the popup");
     79 
     80  // Scroll down as much as possible to get the max scroll offset.
     81  scrollbox.scrollTo(0, 100000);
     82  const scrollMax = scrollbox.scrollTop;
     83  ok(scrollMax, "The max scroll offset should not be zero");
     84 
     85  // Restore the scroll offset.
     86  // Note that this restoring needs to be done in the same paint where the above scrollTo happened so that
     87  // APZ will never sample the max scroll offset at this moment.
     88  scrollbox.scrollTo(0, 0);
     89  await promiseApzFlushedRepaints(selectPopup);
     90 
     91  // Now scroll to a position which is close to the bottom.
     92  scrollbox.scrollBy(0, scrollMax - 10);
     93  await promiseApzFlushedRepaints(selectPopup);
     94 
     95  // Try to scroll to the bottom with a `scrollBy` call, even if paint-skip
     96  // is enabled, this scroll operation should be reflected to APZ.
     97  scrollbox.scrollBy(0, 10);
     98 
     99  // Wait a bit to make sure that APZ has sampled the new scroll offset.
    100  await promiseApzFlushedRepaints(selectPopup);
    101  await promiseApzFlushedRepaints(selectPopup);
    102 
    103  is(
    104    scrollbox.scrollTop,
    105    scrollMax,
    106    `The scroll offset: ${scrollbox.scrollTop} on the main-thread should be ${scrollMax}`
    107  );
    108 
    109  const sampledData = collectSampledScrollOffsets(scrollbox, selectPopup);
    110  ok(sampledData.length, "There should be at least one collected offsets");
    111  ok(
    112    sampledData.some(
    113      data => SpecialPowers.wrap(data).scrollOffsetY - scrollMax < 1.0
    114    ),
    115    `There should be ${scrollMax} in [${sampledData.map(data => SpecialPowers.wrap(data).scrollOffsetY)}]`
    116  );
    117 
    118  BrowserTestUtils.removeTab(tab);
    119 });