4a4509a537
We have a lot of ISimpleDOM code which only works for LocalAccessible. Because all web content uses RemoteAccessible now, practically, the only usable ISimpleDOM functionality is that which works for RemoteAccessible. Therefore, remove all code that only works for LocalAccessible. Differential Revision: https://phabricator.services.mozilla.com/D241805
79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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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 "MsaaIdGenerator.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/Unused.h"
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#include "MsaaAccessible.h"
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#include "nsAccessibilityService.h"
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namespace mozilla {
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namespace a11y {
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uint32_t MsaaIdGenerator::GetID() {
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if (!mGetIDCalled) {
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mGetIDCalled = true;
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// this is a static instance, so capturing this here is safe.
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RunOnShutdown([this] {
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if (mReleaseIDTimer) {
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mReleaseIDTimer->Cancel();
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ReleasePendingIDs();
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}
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});
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}
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uint32_t id = mIDSet.GetID();
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MOZ_ASSERT(id <= ((1UL << kNumFullIDBits) - 1UL));
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return ~id;
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}
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void MsaaIdGenerator::ReleasePendingIDs() {
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for (auto id : mIDsToRelease) {
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mIDSet.ReleaseID(~id);
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}
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mIDsToRelease.Clear();
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mReleaseIDTimer = nullptr;
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}
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bool MsaaIdGenerator::ReleaseID(uint32_t aID) {
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MOZ_ASSERT(aID != MsaaAccessible::kNoID);
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// Releasing an id means it can be reused. Reusing ids too quickly can
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// cause problems for clients which process events asynchronously.
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// Therefore, we release ids after a short delay. This doesn't seem to be
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// necessary when the cache is disabled, perhaps because the COM runtime
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// holds references to our objects for longer.
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if (nsAccessibilityService::IsShutdown()) {
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// If accessibility is shut down, no more Accessibles will be created.
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// Also, if the service is shut down, it's possible XPCOM is also shutting
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// down, in which case timers won't work. Thus, we release the id
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// immediately.
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mIDSet.ReleaseID(~aID);
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return true;
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}
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const uint32_t kReleaseDelay = 1000;
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mIDsToRelease.AppendElement(aID);
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if (mReleaseIDTimer) {
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mReleaseIDTimer->SetDelay(kReleaseDelay);
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} else {
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NS_NewTimerWithCallback(
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getter_AddRefs(mReleaseIDTimer),
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// mReleaseIDTimer is cancelled on shutdown and this is a static
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// instance, so capturing this here is safe.
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[this](nsITimer* aTimer) { ReleasePendingIDs(); }, kReleaseDelay,
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nsITimer::TYPE_ONE_SHOT, "a11y::MsaaIdGenerator::ReleaseIDDelayed");
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}
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return true;
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}
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void MsaaIdGenerator::ReleaseID(NotNull<MsaaAccessible*> aMsaaAcc) {
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ReleaseID(aMsaaAcc->GetExistingID());
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}
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} // namespace a11y
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} // namespace mozilla
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