96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
/* -*- 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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