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95 lines
3.1 KiB
95 lines
3.1 KiB
/* -*- Mode: C++; tab-width: 8; 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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#include "ServiceProvider.h" |
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#include "ApplicationAccessibleWrap.h" |
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#include "Compatibility.h" |
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#include "DocAccessible.h" |
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#include "nsAccUtils.h" |
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#include "nsCoreUtils.h" |
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#include "Relation.h" |
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#include "uiaRawElmProvider.h" |
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#include "mozilla/Preferences.h" |
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#include "nsIDocShell.h" |
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#include "ISimpleDOMNode_i.c" |
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namespace mozilla { |
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namespace a11y { |
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IMPL_IUNKNOWN_QUERY_HEAD(ServiceProvider) |
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IMPL_IUNKNOWN_QUERY_IFACE(IServiceProvider) |
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IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAccessible) |
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//////////////////////////////////////////////////////////////////////////////// |
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// IServiceProvider |
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STDMETHODIMP |
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ServiceProvider::QueryService(REFGUID aGuidService, REFIID aIID, |
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void** aInstancePtr) |
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{ |
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if (!aInstancePtr) |
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return E_INVALIDARG; |
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*aInstancePtr = nullptr; |
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// UIA IAccessibleEx |
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if (aGuidService == IID_IAccessibleEx && |
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Preferences::GetBool("accessibility.uia.enable")) { |
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uiaRawElmProvider* accEx = new uiaRawElmProvider(mAccessible); |
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HRESULT hr = accEx->QueryInterface(aIID, aInstancePtr); |
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if (FAILED(hr)) |
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delete accEx; |
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return hr; |
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} |
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// Provide a special service ID for getting the accessible for the browser tab |
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// document that contains this accessible object. If this accessible object |
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// is not inside a browser tab then the service fails with E_NOINTERFACE. |
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// A use case for this is for screen readers that need to switch context or |
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// 'virtual buffer' when focus moves from one browser tab area to another. |
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static const GUID SID_IAccessibleContentDocument = |
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{ 0xa5d8e1f3,0x3571,0x4d8f,{0x95,0x21,0x07,0xed,0x28,0xfb,0x07,0x2e} }; |
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if (aGuidService == SID_IAccessibleContentDocument) { |
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if (aIID != IID_IAccessible) |
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return E_NOINTERFACE; |
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Relation rel = mAccessible->RelationByType(RelationType::CONTAINING_TAB_PANE); |
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AccessibleWrap* tabDoc = static_cast<AccessibleWrap*>(rel.Next()); |
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if (!tabDoc) |
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return E_NOINTERFACE; |
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*aInstancePtr = static_cast<IAccessible*>(tabDoc); |
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(reinterpret_cast<IUnknown*>(*aInstancePtr))->AddRef(); |
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return S_OK; |
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} |
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// Can get to IAccessibleApplication from any node via QS |
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if (aGuidService == IID_IAccessibleApplication || |
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(Compatibility::IsJAWS() && aIID == IID_IAccessibleApplication)) { |
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ApplicationAccessibleWrap* applicationAcc = |
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static_cast<ApplicationAccessibleWrap*>(ApplicationAcc()); |
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if (!applicationAcc) |
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return E_NOINTERFACE; |
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return applicationAcc->QueryInterface(aIID, aInstancePtr); |
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} |
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static const GUID IID_SimpleDOMDeprecated = |
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{ 0x0c539790,0x12e4,0x11cf,{0xb6,0x61,0x00,0xaa,0x00,0x4c,0xd6,0xd8} }; |
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if (aGuidService == IID_ISimpleDOMNode || |
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aGuidService == IID_SimpleDOMDeprecated || |
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aGuidService == IID_IAccessible || aGuidService == IID_IAccessible2) |
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return mAccessible->QueryInterface(aIID, aInstancePtr); |
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return E_INVALIDARG; |
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} |
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} // namespace a11y |
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} // namespace mozilla
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