ash/ash_touch_exploration_manager_chromeos.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 "ash/ash_touch_exploration_manager_chromeos.h"
   6
   7 #include "ash/accessibility_delegate.h"
   8 #include "ash/audio/sounds.h"
   9 #include "ash/root_window_controller.h"
  10 #include "ash/shell.h"
  11 #include "ash/system/tray/system_tray_notifier.h"
  12 #include "base/command_line.h"
  13 #include "chromeos/audio/chromeos_sounds.h"
  14 #include "chromeos/audio/cras_audio_handler.h"
  15 #include "chromeos/chromeos_switches.h"
  16 #include "ui/chromeos/touch_exploration_controller.h"
  17
  18 namespace ash {
  19
  20 AshTouchExplorationManager::AshTouchExplorationManager(
  21     RootWindowController* root_window_controller)
  22     : root_window_controller_(root_window_controller),
  23       audio_handler_(chromeos::CrasAudioHandler::Get()) {
  24   Shell::GetInstance()->system_tray_notifier()->AddAccessibilityObserver(this);
  25   UpdateTouchExplorationState();
  26 }
  27
  28 AshTouchExplorationManager::~AshTouchExplorationManager() {
  29   SystemTrayNotifier* system_tray_notifier =
  30       Shell::GetInstance()->system_tray_notifier();
  31   if (system_tray_notifier)
  32     system_tray_notifier->RemoveAccessibilityObserver(this);
  33 }
  34
  35 void AshTouchExplorationManager::OnAccessibilityModeChanged(
  36     AccessibilityNotificationVisibility notify) {
  37   UpdateTouchExplorationState();
  38 }
  39
  40 void AshTouchExplorationManager::PlayVolumeAdjustSound() {
  41   if (!VolumeAdjustSoundEnabled())
  42     return;
  43   if ((!audio_handler_->IsOutputMuted()) ||
  44       !(audio_handler_->GetOutputVolumePercent() == 100))
  45     PlaySystemSoundIfSpokenFeedback(chromeos::SOUND_VOLUME_ADJUST);
  46 }
  47
  48 void AshTouchExplorationManager::SetOutputLevel(int volume) {
  49   if (volume > 0) {
  50     if (audio_handler_->IsOutputMuted()) {
  51       audio_handler_->SetOutputMute(false);
  52     }
  53   }
  54   audio_handler_->SetOutputVolumePercent(volume);
  55   // Avoid negative volume.
  56   if (audio_handler_->IsOutputVolumeBelowDefaultMuteLevel())
  57     audio_handler_->SetOutputMute(true);
  58 }
  59
  60 void AshTouchExplorationManager::UpdateTouchExplorationState() {
  61   AccessibilityDelegate* delegate =
  62       Shell::GetInstance()->accessibility_delegate();
  63   bool enabled = delegate->IsSpokenFeedbackEnabled();
  64
  65   if (enabled && !touch_exploration_controller_.get()) {
  66     touch_exploration_controller_.reset(new ui::TouchExplorationController(
  67         root_window_controller_->GetRootWindow(), this));
  68   } else if (!enabled) {
  69     touch_exploration_controller_.reset();
  70   }
  71 }
  72
  73 bool AshTouchExplorationManager::VolumeAdjustSoundEnabled() {
  74   return !CommandLine::ForCurrentProcess()->HasSwitch(
  75       chromeos::switches::kDisableVolumeAdjustSound);
  76 }
  77
  78 }  // namespace ash