content/browser/accessibility/accessibility_mode_helper.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/logging.h"
   6 #include "content/browser/accessibility/accessibility_mode_helper.h"
   7
   8 #if defined(OS_WIN)
   9 #include "base/command_line.h"
  10 #include "base/win/windows_version.h"
  11 #include "content/public/common/content_switches.h"
  12 #endif
  13
  14 namespace content {
  15
  16 namespace {
  17
  18 AccessibilityMode CastToAccessibilityMode(unsigned int int_mode) {
  19   AccessibilityMode mode = static_cast<AccessibilityMode>(int_mode);
  20   switch (mode) {
  21   case AccessibilityModeOff:
  22   case AccessibilityModeComplete:
  23   case AccessibilityModeEditableTextOnly:
  24   case AccessibilityModeTreeOnly:
  25     return mode;
  26   }
  27   DCHECK(false) << "Could not convert to AccessibilityMode: " << int_mode;
  28   return AccessibilityModeOff;
  29 }
  30
  31 }  // namespace
  32
  33 AccessibilityMode AddAccessibilityModeTo(AccessibilityMode to,
  34                                          AccessibilityMode mode_to_add) {
  35   return CastToAccessibilityMode(to | mode_to_add);
  36 }
  37
  38 AccessibilityMode RemoveAccessibilityModeFrom(
  39     AccessibilityMode from,
  40     AccessibilityMode mode_to_remove) {
  41   unsigned int new_mode = from ^ (mode_to_remove & from);
  42 #if defined(OS_WIN)
  43   // On Windows 8, always enable accessibility for editable text controls
  44   // so we can show the virtual keyboard when one is enabled.
  45   if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
  46       !CommandLine::ForCurrentProcess()->HasSwitch(
  47           switches::kDisableRendererAccessibility)) {
  48     if ((from & AccessibilityModeEditableTextOnly) ==
  49         AccessibilityModeEditableTextOnly)
  50       new_mode |= AccessibilityModeEditableTextOnly;
  51   }
  52 #endif  // defined(OS_WIN)
  53
  54   return CastToAccessibilityMode(new_mode);
  55 }
  56
  57 }  // namespace content