зеркало из https://github.com/mozilla/gecko-dev.git
68 строки
2.3 KiB
JavaScript
68 строки
2.3 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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add_task(function* () {
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// Create a11y service.
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let a11yInit = initPromise();
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let accService = Cc['@mozilla.org/accessibilityService;1'].getService(
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Ci.nsIAccessibilityService);
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yield a11yInit;
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ok(accService, 'Service initialized');
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let docAcc = accService.getAccessibleFor(document);
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ok(docAcc, 'Accessible document is created');
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// Accessible object reference will live longer than the scope of this
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// function.
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let acc = yield new Promise(resolve => {
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let intervalId = setInterval(() => {
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let tabAcc = accService.getAccessibleFor(gBrowser.mCurrentTab);
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if (tabAcc) {
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clearInterval(intervalId);
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resolve(tabAcc);
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}
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}, 10);
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});
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ok(acc, 'Accessible object is created');
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let canShutdown = false;
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// This promise will resolve only if canShutdown flag is set to true. If
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// 'a11y-init-or-shutdown' event with '0' flag comes before it can be shut
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// down, the promise will reject.
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let a11yShutdown = new Promise((resolve, reject) =>
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shutdownPromise().then(flag => canShutdown ? resolve() :
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reject('Accessible service was shut down incorrectly')));
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accService = null;
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ok(!accService, 'Service is removed');
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// Force garbage collection that should not trigger shutdown because there are
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// references to accessible objects.
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forceGC();
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// Have some breathing room when removing a11y service references.
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yield new Promise(resolve => executeSoon(resolve));
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// Remove a reference to an accessible object.
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acc = null;
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ok(!acc, 'Accessible object is removed');
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// Force garbage collection that should not trigger shutdown because there is
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// a reference to an accessible document.
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forceGC();
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// Have some breathing room when removing a11y service references.
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yield new Promise(resolve => executeSoon(resolve));
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// Now allow a11y service to shutdown.
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canShutdown = true;
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// Remove a reference to an accessible document.
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docAcc = null;
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ok(!docAcc, 'Accessible document is removed');
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// Force garbage collection that should now trigger shutdown.
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forceGC();
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yield a11yShutdown;
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});
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