tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ServiceProvider.cpp (3283B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "ServiceProvider.h"
      8 
      9 #include "AccessibleApplication_i.c"
     10 #include "ApplicationAccessibleWrap.h"
     11 #include "DocAccessible.h"
     12 #include "nsAccUtils.h"
     13 #include "nsCoreUtils.h"
     14 #include "Relation.h"
     15 #include "RootAccessible.h"
     16 #include "uiaRawElmProvider.h"
     17 
     18 #include "mozilla/a11y/Compatibility.h"
     19 #include "mozilla/a11y/DocAccessibleChild.h"
     20 
     21 #include "ISimpleDOM.h"
     22 
     23 namespace mozilla {
     24 namespace a11y {
     25 
     26 IMPL_IUNKNOWN_QUERY_HEAD(ServiceProvider)
     27 IMPL_IUNKNOWN_QUERY_IFACE(IServiceProvider)
     28 IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mMsaa)
     29 
     30 ////////////////////////////////////////////////////////////////////////////////
     31 // IServiceProvider
     32 
     33 STDMETHODIMP
     34 ServiceProvider::QueryService(REFGUID aGuidService, REFIID aIID,
     35                              void** aInstancePtr) {
     36  if (!aInstancePtr) return E_INVALIDARG;
     37 
     38  *aInstancePtr = nullptr;
     39  Accessible* acc = mMsaa->Acc();
     40  if (!acc) {
     41    return CO_E_OBJNOTCONNECTED;
     42  }
     43 
     44  // Provide a special service ID for getting the accessible for the browser tab
     45  // document that contains this accessible object. If this accessible object
     46  // is not inside a browser tab then the service fails with E_NOINTERFACE.
     47  // A use case for this is for screen readers that need to switch context or
     48  // 'virtual buffer' when focus moves from one browser tab area to another.
     49  static const GUID SID_IAccessibleContentDocument = {
     50      0xa5d8e1f3,
     51      0x3571,
     52      0x4d8f,
     53      {0x95, 0x21, 0x07, 0xed, 0x28, 0xfb, 0x07, 0x2e}};
     54  if (aGuidService == SID_IAccessibleContentDocument) {
     55    if (aIID != IID_IAccessible) return E_NOINTERFACE;
     56 
     57    Relation rel = acc->RelationByType(RelationType::CONTAINING_TAB_PANE);
     58    RefPtr<IAccessible> next = MsaaAccessible::GetFrom(rel.Next());
     59    if (!next) {
     60      return E_NOINTERFACE;
     61    }
     62 
     63    next.forget(aInstancePtr);
     64    return S_OK;
     65  }
     66 
     67  // Can get to IAccessibleApplication from any node via QS
     68  // Note: in case of JAWS we want to check if aIID is
     69  // IID_IAccessibleApplication.
     70  if (aGuidService == IID_IAccessibleApplication ||
     71      aIID == IID_IAccessibleApplication) {
     72    ApplicationAccessibleWrap* applicationAcc =
     73        static_cast<ApplicationAccessibleWrap*>(ApplicationAcc());
     74    if (!applicationAcc) return E_NOINTERFACE;
     75 
     76    RefPtr<IAccessible> appIa;
     77    applicationAcc->GetNativeInterface(getter_AddRefs(appIa));
     78    return appIa->QueryInterface(aIID, aInstancePtr);
     79  }
     80 
     81  static const GUID IID_SimpleDOMDeprecated = {
     82      0x0c539790,
     83      0x12e4,
     84      0x11cf,
     85      {0xb6, 0x61, 0x00, 0xaa, 0x00, 0x4c, 0xd6, 0xd8}};
     86  if (aGuidService == IID_ISimpleDOMNode ||
     87      aGuidService == IID_SimpleDOMDeprecated ||
     88      aGuidService == IID_IAccessible || aGuidService == IID_IAccessible2 ||
     89      // UIA IAccessibleEx
     90      (aGuidService == IID_IAccessibleEx && Compatibility::IsUiaEnabled())) {
     91    return mMsaa->QueryInterface(aIID, aInstancePtr);
     92  }
     93 
     94  return E_INVALIDARG;
     95 }
     96 
     97 }  // namespace a11y
     98 }  // namespace mozilla