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127 lines
4.3 KiB
JavaScript
127 lines
4.3 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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"use strict";
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/**
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* WHOA THERE: We should never be adding new things to EXPECTED_REFLOWS.
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* Instead of adding reflows to the list, you should be modifying your code to
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* avoid the reflow.
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*
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* See https://firefox-source-docs.mozilla.org/performance/bestpractices.html
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* for tips on how to do that.
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*/
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const EXPECTED_REFLOWS = [
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/**
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* Nothing here! Please don't add anything new!
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*/
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];
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/*
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* This test ensures that there are no unexpected
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* uninterruptible reflows when switching between two
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* tabs that are both fully visible.
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*/
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add_task(async function () {
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// TODO (bug 1702653): Disable tab shadows for tests since the shadow
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// can extend outside of the boundingClientRect. The tabRect will need
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// to grow to include the shadow size.
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gBrowser.tabContainer.setAttribute("noshadowfortests", "true");
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await ensureNoPreloadedBrowser();
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await disableFxaBadge();
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// The test starts on about:blank and opens an about:blank
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// tab which triggers opening the toolbar since
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// ensureNoPreloadedBrowser sets AboutNewTab.newTabURL to about:blank.
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await SpecialPowers.pushPrefEnv({
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set: [["browser.toolbars.bookmarks.visibility", "never"]],
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});
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// At the time of writing, there are no reflows on simple tab switching.
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// Mochitest will fail if we have no assertions, so we add one here
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// to make sure nobody adds any new ones.
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Assert.equal(
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EXPECTED_REFLOWS.length,
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0,
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"We shouldn't have added any new expected reflows."
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);
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let origTab = gBrowser.selectedTab;
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let firstSwitchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
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let otherTab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
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await firstSwitchDone;
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let tabStripRect =
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gBrowser.tabContainer.arrowScrollbox.getBoundingClientRect();
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let firstTabRect = origTab.getBoundingClientRect();
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let tabPaddingStart = parseFloat(
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getComputedStyle(gBrowser.selectedTab).paddingInlineStart
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);
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let minTabWidth = firstTabRect.width - 2 * tabPaddingStart;
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if (AppConstants.platform == "macosx") {
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// On macOS, after bug 1886729, gecko screenshots like the ones for this
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// test can't screenshot the native titlebar. That, plus the fact that
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// there's no border or shadow (see bug 1702653) means that we only end up
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// with the tab text color changing, which is smaller than the tab
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// background size.
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minTabWidth = 0;
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}
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let maxTabWidth = firstTabRect.width;
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let inRange = (val, min, max) => min <= val && val <= max;
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await withPerfObserver(
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async function () {
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let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
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gBrowser.selectedTab = origTab;
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await switchDone;
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},
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{
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expectedReflows: EXPECTED_REFLOWS,
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frames: {
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filter: rects =>
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rects.filter(
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r =>
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!(
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// We expect all changes to be within the tab strip.
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(
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r.y1 >= tabStripRect.top &&
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r.y2 <= tabStripRect.bottom &&
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r.x1 >= tabStripRect.left &&
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r.x2 <= tabStripRect.right &&
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// The tab selection changes between 2 adjacent tabs, so we expect
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// both to change color at once: this should be a single rect of the
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// width of 2 tabs.
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inRange(r.w, minTabWidth, maxTabWidth * 2)
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)
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)
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),
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exceptions: [
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{
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name:
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"bug 1446454 - the border between tabs should be painted at" +
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" the same time as the tab switch",
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condition: r =>
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// In tab strip
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r.y1 >= tabStripRect.top &&
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r.y2 <= tabStripRect.bottom &&
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// 1px border, 1px before the end of the first tab.
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r.w == 1 &&
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r.x1 == firstTabRect.right - 1,
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},
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{
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name: "bug 1446449 - spurious tab switch spinner",
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condition: r =>
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AppConstants.DEBUG &&
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// In the content area
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r.y1 >=
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document.getElementById("appcontent").getBoundingClientRect()
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.top,
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},
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],
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},
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}
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);
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BrowserTestUtils.removeTab(otherTab);
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});
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