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8cf50fce46
This revision adds code that will make it simple to request new cache domains as as response to assistive technology queries. Differential Revision: https://phabricator.services.mozilla.com/D220038
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set expandtab shiftwidth=2 tabstop=2: */
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/* 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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#include "CacheConstants.h"
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#include "nsAccessibilityService.h"
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namespace mozilla::a11y {
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// Get the set of cache domains required by the given cache domains, which will
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// always be equal to or a superset of the given set of cache domains.
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static uint64_t GetCacheDomainSuperset(uint64_t aCacheDomains) {
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uint64_t allNecessaryDomains = aCacheDomains;
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if (aCacheDomains & CacheDomain::TextOffsetAttributes) {
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allNecessaryDomains |= CacheDomain::Text;
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}
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if (aCacheDomains & CacheDomain::TextBounds) {
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allNecessaryDomains |= CacheDomain::Text;
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allNecessaryDomains |= CacheDomain::Bounds;
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}
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MOZ_ASSERT((allNecessaryDomains & aCacheDomains) == aCacheDomains,
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"Return value is not a superset of the input.");
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return allNecessaryDomains;
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}
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bool DomainsAreActive(uint64_t aRequiredCacheDomains) {
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const uint64_t activeCacheDomains =
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nsAccessibilityService::GetActiveCacheDomains();
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const bool allRequiredDomainsAreActive =
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(aRequiredCacheDomains & ~activeCacheDomains) == 0;
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return allRequiredDomainsAreActive;
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}
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bool RequestDomainsIfInactive(uint64_t aRequiredCacheDomains) {
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nsAccessibilityService* accService = GetAccService();
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if (!accService) {
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return true;
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}
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const uint64_t activeCacheDomains =
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nsAccessibilityService::GetActiveCacheDomains();
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const bool isMissingRequiredCacheDomain =
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(aRequiredCacheDomains & ~activeCacheDomains) != 0;
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if (isMissingRequiredCacheDomain) {
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aRequiredCacheDomains = GetCacheDomainSuperset(aRequiredCacheDomains);
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const uint64_t cacheDomains = aRequiredCacheDomains | activeCacheDomains;
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#if defined(ANDROID)
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// We might not be on the main Android thread, but we must be in order to
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// send IPDL messages. Dispatch to the main thread to set cache domains.
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NS_DispatchToMainThread(
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NS_NewRunnableFunction("a11y::SetCacheDomains", [cacheDomains]() {
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if (nsAccessibilityService* accService = GetAccService()) {
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accService->SetCacheDomains(cacheDomains);
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}
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}));
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return true;
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#endif
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accService->SetCacheDomains(cacheDomains);
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return true;
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}
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return false;
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}
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} // namespace mozilla::a11y
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