56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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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#ifndef mozilla_a11y_MsaaIdGenerator_h
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#define mozilla_a11y_MsaaIdGenerator_h
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#include "mozilla/a11y/IDSet.h"
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#include "mozilla/dom/ipc/IdType.h"
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namespace mozilla {
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namespace a11y {
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class AccessibleWrap;
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/**
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* This class is responsible for generating child IDs used by our MSAA
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* implementation. Since e10s requires us to differentiate IDs based on the
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* originating process of the accessible, a portion of the ID's bits are
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* allocated to storing that information. The remaining bits represent the
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* unique ID of the accessible, within that content process.
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*
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* The constants kNumContentProcessIDBits and kNumUniqueIDBits in the
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* implementation are responsible for determining the proportion of bits that
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* are allocated for each purpose.
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*/
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class MsaaIdGenerator
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{
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public:
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MsaaIdGenerator();
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uint32_t GetID();
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void ReleaseID(AccessibleWrap* aAccWrap);
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bool IsChromeID(uint32_t aID);
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bool IsIDForThisContentProcess(uint32_t aID);
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bool IsIDForContentProcess(uint32_t aID,
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dom::ContentParentId aIPCContentProcessId);
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bool IsSameContentProcessFor(uint32_t aFirstID, uint32_t aSecondID);
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uint32_t GetContentProcessIDFor(dom::ContentParentId aIPCContentProcessID);
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void ReleaseContentProcessIDFor(dom::ContentParentId aIPCContentProcessID);
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private:
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uint32_t ResolveContentProcessID();
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private:
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IDSet mIDSet;
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};
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} // namespace a11y
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} // namespace mozilla
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#endif // mozilla_a11y_MsaaIdGenerator_h
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