The Tor Browser: accessible/src/windows/msaa/Compatibility.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim: set ts=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/. */

     7 #include "Compatibility.h"

     9 #include "nsWinUtils.h"

    10 #include "Statistics.h"

    12 #include "mozilla/Preferences.h"

    14 using namespace mozilla;

    15 using namespace mozilla::a11y;

    17 /**

    18  * Return true if module version is lesser than the given version.

    19  */

    20 bool

    21 IsModuleVersionLessThan(HMODULE aModuleHandle, DWORD aMajor, DWORD aMinor)

    22 {

    23   wchar_t fileName[MAX_PATH];

    24   ::GetModuleFileNameW(aModuleHandle, fileName, MAX_PATH);

    26   DWORD dummy = 0;

    27   DWORD length = ::GetFileVersionInfoSizeW(fileName, &dummy);

    29   LPBYTE versionInfo = new BYTE[length];

    30   ::GetFileVersionInfoW(fileName, 0, length, versionInfo);

    32   UINT uLen;

    33   VS_FIXEDFILEINFO* fixedFileInfo = nullptr;

    34   ::VerQueryValueW(versionInfo, L"\\", (LPVOID*)&fixedFileInfo, &uLen);

    35   DWORD dwFileVersionMS = fixedFileInfo->dwFileVersionMS;

    36   DWORD dwFileVersionLS = fixedFileInfo->dwFileVersionLS;

    37   delete [] versionInfo;

    39   DWORD dwLeftMost = HIWORD(dwFileVersionMS);

    40   DWORD dwSecondRight = HIWORD(dwFileVersionLS);

    41   return (dwLeftMost < aMajor ||

    42     (dwLeftMost == aMajor && dwSecondRight < aMinor));

    43 }

    46 ////////////////////////////////////////////////////////////////////////////////

    47 // Compatibility

    48 ////////////////////////////////////////////////////////////////////////////////

    50 uint32_t Compatibility::sConsumers = Compatibility::UNKNOWN;

    52 void

    53 Compatibility::Init()

    54 {

    55   // Note we collect some AT statistics/telemetry here for convenience.

    57   HMODULE jawsHandle = ::GetModuleHandleW(L"jhook");

    58   if (jawsHandle)

    59     sConsumers |= (IsModuleVersionLessThan(jawsHandle, 8, 2173)) ?

    60                    OLDJAWS : JAWS;

    62   if (::GetModuleHandleW(L"gwm32inc"))

    63     sConsumers |= WE;

    65   if (::GetModuleHandleW(L"dolwinhk"))

    66     sConsumers |= DOLPHIN;

    68   if (::GetModuleHandleW(L"STSA32"))

    69     sConsumers |= SEROTEK;

    71   if (::GetModuleHandleW(L"nvdaHelperRemote"))

    72     sConsumers |= NVDA;

    74   if (::GetModuleHandleW(L"OsmHooks"))

    75     sConsumers |= COBRA;

    77   if (::GetModuleHandleW(L"WebFinderRemote"))

    78     sConsumers |= ZOOMTEXT;

    80   if (::GetModuleHandleW(L"Kazahook"))

    81     sConsumers |= KAZAGURU;

    83   if (::GetModuleHandleW(L"TextExtractorImpl32") ||

    84       ::GetModuleHandleW(L"TextExtractorImpl64"))

    85     sConsumers |= YOUDAO;

    87   if (::GetModuleHandleW(L"uiautomation") ||

    88       ::GetModuleHandleW(L"uiautomationcore"))

    89     sConsumers |= UIAUTOMATION;

    91   // If we have a known consumer remove the unknown bit.

    92   if (sConsumers != Compatibility::UNKNOWN)

    93     sConsumers ^= Compatibility::UNKNOWN;

    95   // Gather telemetry

    96   uint32_t temp = sConsumers;

    97   for (int i = 0; temp; i++) {

    98     if (temp & 0x1)

    99       statistics::A11yConsumers(i);

   101     temp >>= 1;

   102   }

   104   // Turn off new tab switching for Jaws and WE.

   105   if (sConsumers & (JAWS | OLDJAWS | WE)) {

   106     // Check to see if the pref for disallowing CtrlTab is already set. If so,

   107     // bail out (respect the user settings). If not, set it.

   108     if (!Preferences::HasUserValue("browser.ctrlTab.disallowForScreenReaders"))

   109       Preferences::SetBool("browser.ctrlTab.disallowForScreenReaders", true);

   110   }

   111 }

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