A11y setting: mono audio UI

chrome/browser/chromeos/accessibility/accessibility_manager.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 36 matching lines @@
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/api/accessibility_private.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/manifest_handlers/content_scripts_handler.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/browser_resources.h"
+#include "chromeos/audio/audio_a11y_controller.h"
 #include "chromeos/audio/chromeos_sounds.h"
 #include "chromeos/login/login_state.h"
 #include "components/prefs/pref_member.h"
 #include "components/prefs/pref_service.h"
 #include "components/user_manager/user_manager.h"
 #include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
@@ skipping 327 matching lines @@
     : profile_(NULL),
       chrome_vox_loaded_on_lock_screen_(false),
       chrome_vox_loaded_on_user_screen_(false),
       large_cursor_pref_handler_(prefs::kAccessibilityLargeCursorEnabled),
       spoken_feedback_pref_handler_(prefs::kAccessibilitySpokenFeedbackEnabled),
       high_contrast_pref_handler_(prefs::kAccessibilityHighContrastEnabled),
       autoclick_pref_handler_(prefs::kAccessibilityAutoclickEnabled),
       autoclick_delay_pref_handler_(prefs::kAccessibilityAutoclickDelayMs),
       virtual_keyboard_pref_handler_(
           prefs::kAccessibilityVirtualKeyboardEnabled),
+      mono_audio_pref_handler_(
+          prefs::kAccessibilityMonoAudioEnabled),
       caret_highlight_pref_handler_(prefs::kAccessibilityCaretHighlightEnabled),
       cursor_highlight_pref_handler_(
           prefs::kAccessibilityCursorHighlightEnabled),
       focus_highlight_pref_handler_(prefs::kAccessibilityFocusHighlightEnabled),
       select_to_speak_pref_handler_(prefs::kAccessibilitySelectToSpeakEnabled),
       switch_access_pref_handler_(prefs::kAccessibilitySwitchAccessEnabled),
       large_cursor_enabled_(false),
       sticky_keys_enabled_(false),
       spoken_feedback_enabled_(false),
       high_contrast_enabled_(false),
       autoclick_enabled_(false),
       autoclick_delay_ms_(ash::AutoclickController::kDefaultAutoclickDelayMs),
       virtual_keyboard_enabled_(false),
+      mono_audio_enabled_(false),
       caret_highlight_enabled_(false),
       cursor_highlight_enabled_(false),
       focus_highlight_enabled_(false),
       select_to_speak_enabled_(false),
       switch_access_enabled_(false),
       spoken_feedback_notification_(ui::A11Y_NOTIFICATION_NONE),
       should_speak_chrome_vox_announcements_on_user_screen_(true),
       system_sounds_enabled_(false),
       braille_display_connected_(false),
       scoped_braille_observer_(this),
@@ skipping 58 matching lines @@
        it != profiles.end();
        ++it) {
     PrefService* pref_service = (*it)->GetPrefs();
     if (pref_service->GetBoolean(prefs::kAccessibilityStickyKeysEnabled) ||
         pref_service->GetBoolean(prefs::kAccessibilityLargeCursorEnabled) ||
         pref_service->GetBoolean(prefs::kAccessibilitySpokenFeedbackEnabled) ||
         pref_service->GetBoolean(prefs::kAccessibilityHighContrastEnabled) ||
         pref_service->GetBoolean(prefs::kAccessibilityAutoclickEnabled) ||
         pref_service->GetBoolean(prefs::kShouldAlwaysShowAccessibilityMenu) ||
         pref_service->GetBoolean(prefs::kAccessibilityScreenMagnifierEnabled) ||
-        pref_service->GetBoolean(prefs::kAccessibilityVirtualKeyboardEnabled))
+        pref_service->GetBoolean(prefs::kAccessibilityVirtualKeyboardEnabled) ||
+        pref_service->GetBoolean(prefs::kAccessibilityMonoAudioEnabled))
       return true;
   }
   return false;
 }
 
 bool AccessibilityManager::ShouldEnableCursorCompositing() {
   if (!profile_)
     return false;
   PrefService* pref_service = profile_->GetPrefs();
   // Enable cursor compositing when one or more of the listed accessibility
@@ skipping 366 matching lines @@
   else
     ash::Shell::GetInstance()->DeactivateKeyboard();
 
   AccessibilityStatusEventDetails details(
       ACCESSIBILITY_TOGGLE_VIRTUAL_KEYBOARD,
       enabled,
       ui::A11Y_NOTIFICATION_NONE);
   NotifyAccessibilityStatusChanged(details);
 }
 
+void AccessibilityManager::EnableMonoAudio(bool enabled) {
+  if (!profile_)
+    return;
+
+  PrefService* pref_service = profile_->GetPrefs();
+  pref_service->SetBoolean(prefs::kAccessibilityMonoAudioEnabled,
+                           enabled);
+  pref_service->CommitPendingWrite();
+}
+
+bool AccessibilityManager::IsMonoAudioEnabled() {
+  return mono_audio_enabled_;
+}
+
+void AccessibilityManager::UpdateMonoAudioFromPref() {
+  if (!profile_)
+    return;
+
+  const bool enabled = profile_->GetPrefs()->GetBoolean(
+      prefs::kAccessibilityMonoAudioEnabled);
+
+  if (mono_audio_enabled_ == enabled)
+    return;
+  mono_audio_enabled_ = enabled;
+
+  AccessibilityStatusEventDetails details(
+      ACCESSIBILITY_TOGGLE_MONO_AUDIO,
+      enabled,
+      ui::A11Y_NOTIFICATION_NONE);
+  NotifyAccessibilityStatusChanged(details);
+
+  ash::Shell::GetInstance()->audio_a11y_controller()->SetOutputMono(enabled);
+}
+
 void AccessibilityManager::SetCaretHighlightEnabled(bool enabled) {
   if (!profile_)
     return;
 
   PrefService* pref_service = profile_->GetPrefs();
   pref_service->SetBoolean(prefs::kAccessibilityCaretHighlightEnabled, enabled);
   pref_service->CommitPendingWrite();
 }
 
 bool AccessibilityManager::IsCaretHighlightEnabled() const {
@@ skipping 233 matching lines @@
                    base::Unretained(this)));
     pref_change_registrar_->Add(
         prefs::kAccessibilityAutoclickDelayMs,
         base::Bind(&AccessibilityManager::UpdateAutoclickDelayFromPref,
                    base::Unretained(this)));
     pref_change_registrar_->Add(
         prefs::kAccessibilityVirtualKeyboardEnabled,
         base::Bind(&AccessibilityManager::UpdateVirtualKeyboardFromPref,
                    base::Unretained(this)));
     pref_change_registrar_->Add(
+        prefs::kAccessibilityMonoAudioEnabled,
+        base::Bind(&AccessibilityManager::UpdateMonoAudioFromPref,
+                   base::Unretained(this)));
+    pref_change_registrar_->Add(
         prefs::kAccessibilityCaretHighlightEnabled,
         base::Bind(&AccessibilityManager::UpdateCaretHighlightFromPref,
                    base::Unretained(this)));
     pref_change_registrar_->Add(
         prefs::kAccessibilityCursorHighlightEnabled,
         base::Bind(&AccessibilityManager::UpdateCursorHighlightFromPref,
                    base::Unretained(this)));
     pref_change_registrar_->Add(
         prefs::kAccessibilityFocusHighlightEnabled,
         base::Bind(&AccessibilityManager::UpdateFocusHighlightFromPref,
@@ skipping 19 matching lines @@
             &AccessibilityManager::UpdateChromeOSAccessibilityHistograms,
             base::Unretained(this)));
   }
 
   large_cursor_pref_handler_.HandleProfileChanged(profile_, profile);
   spoken_feedback_pref_handler_.HandleProfileChanged(profile_, profile);
   high_contrast_pref_handler_.HandleProfileChanged(profile_, profile);
   autoclick_pref_handler_.HandleProfileChanged(profile_, profile);
   autoclick_delay_pref_handler_.HandleProfileChanged(profile_, profile);
   virtual_keyboard_pref_handler_.HandleProfileChanged(profile_, profile);
+  mono_audio_pref_handler_.HandleProfileChanged(profile_, profile);
   caret_highlight_pref_handler_.HandleProfileChanged(profile_, profile);
   cursor_highlight_pref_handler_.HandleProfileChanged(profile_, profile);
   focus_highlight_pref_handler_.HandleProfileChanged(profile_, profile);
   select_to_speak_pref_handler_.HandleProfileChanged(profile_, profile);
   switch_access_pref_handler_.HandleProfileChanged(profile_, profile);
 
   bool had_profile = (profile_ != NULL);
   profile_ = profile;
 
   if (!had_profile && profile)
     CheckBrailleState();
   else
     UpdateBrailleImeState();
   UpdateLargeCursorFromPref();
   UpdateStickyKeysFromPref();
   UpdateSpokenFeedbackFromPref();
   UpdateHighContrastFromPref();
   UpdateAutoclickFromPref();
   UpdateAutoclickDelayFromPref();
   UpdateVirtualKeyboardFromPref();
+  UpdateMonoAudioFromPref();
   UpdateCaretHighlightFromPref();
   UpdateCursorHighlightFromPref();
   UpdateFocusHighlightFromPref();
   UpdateSelectToSpeakFromPref();
   UpdateSwitchAccessFromPref();
 
   // Update the panel height in the shelf layout manager when the profile
   // changes, since the shelf layout manager doesn't exist in the login profile.
   if (chromevox_panel_)
     chromevox_panel_->UpdatePanelHeight();
@@ skipping 254 matching lines @@
     content::BrowserContext* context) {
   keyboard_listener_extension_id_ = id;
 
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(context);
   if (!extension_registry_observer_.IsObserving(registry) && !id.empty())
     extension_registry_observer_.Add(registry);
 }
 
 }  // namespace chromeos