1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "Compatibility.h"
#include "mozilla/WindowsVersion.h"
#include "mozilla/WinHeaderOnlyUtils.h"
#include "mozilla/StaticPrefs_accessibility.h"
#include "nsExceptionHandler.h"
#include "nsIXULRuntime.h"
#include "nsPrintfCString.h"
#include "nsUnicharUtils.h"
#include "nsWinUtils.h"
#include "Statistics.h"
#include "AccessibleWrap.h"
#include "mozilla/Preferences.h"
#include <shlobj.h>
using namespace mozilla;
using namespace mozilla::a11y;
/**
* String versions of consumer flags. See GetHumanReadableConsumersStr.
*/
static const wchar_t* ConsumerStringMap[CONSUMERS_ENUM_LEN + 1] = {
L"NVDA", L"JAWS", L"OLDJAWS", L"WE", L"DOLPHIN",
L"SEROTEK", L"COBRA", L"ZOOMTEXT", L"KAZAGURU", L"YOUDAO",
L"UNKNOWN", L"UIAUTOMATION", L"VISPEROSHARED", L"\0"};
bool Compatibility::IsModuleVersionLessThan(HMODULE aModuleHandle,
unsigned long long aVersion) {
LauncherResult<ModuleVersion> version = GetModuleVersion(aModuleHandle);
if (version.isErr()) {
return true;
}
return version.unwrap() < aVersion;
}
////////////////////////////////////////////////////////////////////////////////
// Compatibility
////////////////////////////////////////////////////////////////////////////////
uint32_t Compatibility::sConsumers = Compatibility::UNKNOWN;
/**
* This function is safe to call multiple times.
*/
/* static */
void Compatibility::InitConsumers() {
HMODULE jawsHandle = ::GetModuleHandleW(L"jhook");
if (jawsHandle) {
sConsumers |=
IsModuleVersionLessThan(jawsHandle, MAKE_FILE_VERSION(19, 0, 0, 0))
? OLDJAWS
: JAWS;
}
if (::GetModuleHandleW(L"gwm32inc")) sConsumers |= WE;
if (::GetModuleHandleW(L"dolwinhk")) sConsumers |= DOLPHIN;
if (::GetModuleHandleW(L"STSA32")) sConsumers |= SEROTEK;
if (::GetModuleHandleW(L"nvdaHelperRemote")) sConsumers |= NVDA;
if (::GetModuleHandleW(L"OsmHooks") || ::GetModuleHandleW(L"OsmHks64"))
sConsumers |= COBRA;
if (::GetModuleHandleW(L"WebFinderRemote")) sConsumers |= ZOOMTEXT;
if (::GetModuleHandleW(L"Kazahook")) sConsumers |= KAZAGURU;
if (::GetModuleHandleW(L"TextExtractorImpl32") ||
::GetModuleHandleW(L"TextExtractorImpl64"))
sConsumers |= YOUDAO;
if (::GetModuleHandleW(L"uiautomation") ||
::GetModuleHandleW(L"uiautomationcore"))
sConsumers |= UIAUTOMATION;
if (::GetModuleHandleW(L"AccEventCache")) {
sConsumers |= VISPEROSHARED;
}
// If we have a known consumer remove the unknown bit.
if (sConsumers != Compatibility::UNKNOWN)
sConsumers &= ~Compatibility::UNKNOWN;
}
/* static */
bool Compatibility::HasKnownNonUiaConsumer() {
InitConsumers();
return sConsumers & ~(Compatibility::UNKNOWN | UIAUTOMATION);
}
void Compatibility::Init() {
// Note we collect some AT statistics/telemetry here for convenience.
InitConsumers();
CrashReporter::AnnotateCrashReport(
CrashReporter::Annotation::AccessibilityInProcClient,
nsPrintfCString("0x%X", sConsumers));
// Gather telemetry
uint32_t temp = sConsumers;
for (int i = 0; temp; i++) {
if (temp & 0x1) statistics::A11yConsumers(i);
temp >>= 1;
}
// Turn off new tab switching for Jaws and WE.
if (sConsumers & (JAWS | OLDJAWS | WE)) {
// Check to see if the pref for disallowing CtrlTab is already set. If so,
// bail out (respect the user settings). If not, set it.
if (!Preferences::HasUserValue("browser.ctrlTab.disallowForScreenReaders"))
Preferences::SetBool("browser.ctrlTab.disallowForScreenReaders", true);
}
}
// static
void Compatibility::GetHumanReadableConsumersStr(nsAString& aResult) {
bool appened = false;
uint32_t index = 0;
for (uint32_t consumers = sConsumers; consumers; consumers = consumers >> 1) {
if (consumers & 0x1) {
if (appened) {
aResult.AppendLiteral(",");
}
aResult.Append(ConsumerStringMap[index]);
appened = true;
}
if (++index > CONSUMERS_ENUM_LEN) {
break;
}
}
}
// Time when SuppressA11yForClipboardCopy() was called, as returned by
// ::GetTickCount().
static DWORD sA11yClipboardCopySuppressionStartTime = 0;
/* static */
void Compatibility::SuppressA11yForClipboardCopy() {
// Bug 1774285: Windows Suggested Actions (introduced in Windows 11 22H2)
// might walk the a11y tree using UIA whenever anything is copied to the
// clipboard. This causes an unacceptable hang, particularly when the cache
// is disabled.
bool doSuppress = [&] {
switch (
StaticPrefs::accessibility_windows_suppress_after_clipboard_copy()) {
case 0:
return false;
case 1:
return true;
default:
// Our workaround for Suggested Actions is needed from Windows 11 22H2
return IsWin1122H2OrLater();
}
}();
if (doSuppress) {
sA11yClipboardCopySuppressionStartTime = ::GetTickCount();
}
}
/* static */
bool Compatibility::IsA11ySuppressedForClipboardCopy() {
constexpr DWORD kSuppressTimeout = 1500; // ms
if (!sA11yClipboardCopySuppressionStartTime) {
return false;
}
return ::GetTickCount() - sA11yClipboardCopySuppressionStartTime <
kSuppressTimeout;
}
|
