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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ServiceProvider.h"
#include "ApplicationAccessibleWrap.h"
#include "Compatibility.h"
#include "DocAccessible.h"
#include "nsAccUtils.h"
#include "nsCoreUtils.h"
#include "Relation.h"
#include "uiaRawElmProvider.h"
#include "mozilla/Preferences.h"
#include "nsIDocShell.h"
#include "ISimpleDOMNode_i.c"
namespace mozilla {
namespace a11y {
IMPL_IUNKNOWN_QUERY_HEAD(ServiceProvider)
IMPL_IUNKNOWN_QUERY_IFACE(IServiceProvider)
IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAccessible)
////////////////////////////////////////////////////////////////////////////////
// IServiceProvider
STDMETHODIMP
ServiceProvider::QueryService(REFGUID aGuidService, REFIID aIID,
void** aInstancePtr)
{
if (!aInstancePtr)
return E_INVALIDARG;
*aInstancePtr = nullptr;
// UIA IAccessibleEx
if (aGuidService == IID_IAccessibleEx &&
Preferences::GetBool("accessibility.uia.enable")) {
uiaRawElmProvider* accEx = new uiaRawElmProvider(mAccessible);
HRESULT hr = accEx->QueryInterface(aIID, aInstancePtr);
if (FAILED(hr))
delete accEx;
return hr;
}
// Provide a special service ID for getting the accessible for the browser tab
// document that contains this accessible object. If this accessible object
// is not inside a browser tab then the service fails with E_NOINTERFACE.
// A use case for this is for screen readers that need to switch context or
// 'virtual buffer' when focus moves from one browser tab area to another.
static const GUID SID_IAccessibleContentDocument =
{ 0xa5d8e1f3,0x3571,0x4d8f,{0x95,0x21,0x07,0xed,0x28,0xfb,0x07,0x2e} };
if (aGuidService == SID_IAccessibleContentDocument) {
if (aIID != IID_IAccessible)
return E_NOINTERFACE;
Relation rel = mAccessible->RelationByType(RelationType::CONTAINING_TAB_PANE);
AccessibleWrap* tabDoc = static_cast<AccessibleWrap*>(rel.Next());
if (!tabDoc)
return E_NOINTERFACE;
*aInstancePtr = static_cast<IAccessible*>(tabDoc);
(reinterpret_cast<IUnknown*>(*aInstancePtr))->AddRef();
return S_OK;
}
// Can get to IAccessibleApplication from any node via QS
if (aGuidService == IID_IAccessibleApplication ||
(Compatibility::IsJAWS() && aIID == IID_IAccessibleApplication)) {
ApplicationAccessibleWrap* applicationAcc =
static_cast<ApplicationAccessibleWrap*>(ApplicationAcc());
if (!applicationAcc)
return E_NOINTERFACE;
return applicationAcc->QueryInterface(aIID, aInstancePtr);
}
static const GUID IID_SimpleDOMDeprecated =
{ 0x0c539790,0x12e4,0x11cf,{0xb6,0x61,0x00,0xaa,0x00,0x4c,0xd6,0xd8} };
if (aGuidService == IID_ISimpleDOMNode ||
aGuidService == IID_SimpleDOMDeprecated ||
aGuidService == IID_IAccessible || aGuidService == IID_IAccessible2)
return mAccessible->QueryInterface(aIID, aInstancePtr);
return E_INVALIDARG;
}
} // namespace a11y
} // namespace mozilla
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