зеркало из https://github.com/mozilla/gecko-dev.git
111 строки
3.9 KiB
JavaScript
111 строки
3.9 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const PAGE = "data:text/html,<html><body>A%20regular,%20everyday,%20normal%20page.";
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/**
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* Returns a Promise that resolves when it sees a pageshow and
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* pagehide events in a particular order, where each event must
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* have the persisted property set to true. Will cause a test
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* failure to be logged if it sees an event out of order.
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*
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* @param browser (<xul:browser>)
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* The browser to expect the events from.
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* @param expectedOrder (array)
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* An array of strings describing what order the pageshow
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* and pagehide events should be in.
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* Example:
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* ["pageshow", "pagehide", "pagehide", "pageshow"]
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* @returns Promise
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*/
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function prepareForVisibilityEvents(browser, expectedOrder) {
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return new Promise((resolve) => {
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let order = [];
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let rmvHide, rmvShow;
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let checkSatisfied = () => {
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if (order.length < expectedOrder.length) {
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// We're still waiting...
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return;
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} else {
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rmvHide();
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rmvShow();
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for (let i = 0; i < expectedOrder.length; ++i) {
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is(order[i], expectedOrder[i], "Got expected event");
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}
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resolve();
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}
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};
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let eventListener = (type) => {
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order.push(type);
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checkSatisfied();
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};
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let checkFn = (e) => e.persisted;
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rmvHide = BrowserTestUtils.addContentEventListener(browser, "pagehide",
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() => eventListener("pagehide"),
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false, checkFn, false, false);
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rmvShow = BrowserTestUtils.addContentEventListener(browser, "pageshow",
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() => eventListener("pageshow"),
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false, checkFn, false, false);
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});
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}
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/**
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* Tests that frame scripts get pageshow / pagehide events when
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* swapping browser frameloaders (which occurs when moving a tab
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* into a different window).
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*/
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add_task(async function test_swap_frameloader_pagevisibility_events() {
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// Load a new tab that we'll tear out...
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let tab = BrowserTestUtils.addTab(gBrowser, PAGE);
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gBrowser.selectedTab = tab;
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let firstBrowser = tab.linkedBrowser;
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await BrowserTestUtils.browserLoaded(firstBrowser);
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// Swap the browser out to a new window
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let newWindow = gBrowser.replaceTabWithWindow(tab);
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// We have to wait for the window to load so we can get the selected browser
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// to listen to.
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await BrowserTestUtils.waitForEvent(newWindow, "DOMContentLoaded");
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let newWindowBrowser = newWindow.gBrowser.selectedBrowser;
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// Wait for the expected pagehide and pageshow events on the initial browser
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await prepareForVisibilityEvents(newWindowBrowser, ["pagehide", "pageshow"]);
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// Now let's send the browser back to the original window
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// First, create a new, empty browser tab to replace the window with
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let newTab = BrowserTestUtils.addTab(gBrowser);
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gBrowser.selectedTab = newTab;
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let emptyBrowser = newTab.linkedBrowser;
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// Wait for that initial browser to show its pageshow event if it hasn't
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// happened so that we don't confuse it with the other expected events.
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await ContentTask.spawn(emptyBrowser, {}, async() => {
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if (content.document.visibilityState === "hidden") {
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info("waiting for hidden emptyBrowser to pageshow");
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await ContentTaskUtils.waitForEvent(content, "pageshow");
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}
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});
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// The empty tab we just added show now fire a pagehide as its replaced,
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// and a pageshow once the swap is finished.
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let emptyBrowserPromise =
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prepareForVisibilityEvents(emptyBrowser, ["pagehide", "pageshow"]);
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gBrowser.swapBrowsersAndCloseOther(newTab, newWindow.gBrowser.selectedTab);
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await emptyBrowserPromise;
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gBrowser.removeTab(gBrowser.selectedTab);
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});
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