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