зеркало из https://github.com/mozilla/gecko-dev.git
98 строки
3.2 KiB
C++
98 строки
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=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 "ServiceProvider.h"
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#include "ApplicationAccessibleWrap.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 "ISimpleDOM.h"
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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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if (!aInstancePtr) 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)) 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,
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0x3571,
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0x4d8f,
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{0x95, 0x21, 0x07, 0xed, 0x28, 0xfb, 0x07, 0x2e}};
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if (aGuidService == SID_IAccessibleContentDocument) {
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if (aIID != IID_IAccessible) return E_NOINTERFACE;
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Relation rel =
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mAccessible->RelationByType(RelationType::CONTAINING_TAB_PANE);
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AccessibleWrap* tabDoc = static_cast<AccessibleWrap*>(rel.Next());
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if (!tabDoc) 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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// Note: in case of JAWS we want to check if aIID is
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// IID_IAccessibleApplication.
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if (aGuidService == IID_IAccessibleApplication ||
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aIID == IID_IAccessibleApplication) {
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ApplicationAccessibleWrap* applicationAcc =
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static_cast<ApplicationAccessibleWrap*>(ApplicationAcc());
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if (!applicationAcc) 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,
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0x12e4,
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0x11cf,
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{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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