Add persisted preference for projection touch HUD

chrome/browser/chromeos/preferences.cc

 // Copyright (c) 2012 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/preferences.h"
 
 #include "ash/magnifier/magnifier_constants.h"
-#include "ash/shell_delegate.h"
+#include "ash/shell.h"
 #include "base/chromeos/chromeos_version.h"
 #include "base/command_line.h"
 #include "base/i18n/time_formatting.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_member.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 25 matching lines @@
 
 static const char kFallbackInputMethodLocale[] = "en-US";
 
 // TODO(achuith): Remove deprecated pref in M31. crbug.com/223480.
 static const char kEnableTouchpadThreeFingerSwipe[] =
     "settings.touchpad.enable_three_finger_swipe";
 
 Preferences::Preferences()
     : prefs_(NULL),
       input_method_manager_(input_method::InputMethodManager::Get()) {
+  // Do not observe shell, if there is no shell instance; e.g., in some unit
+  // tests.
+  if (ash::Shell::HasInstance())
+    ash::Shell::GetInstance()->AddShellObserver(this);
 }
 
 Preferences::Preferences(input_method::InputMethodManager* input_method_manager)
     : prefs_(NULL),
       input_method_manager_(input_method_manager) {
+  // Do not observe shell, if there is no shell instance; e.g., in some unit
+  // tests.
+  if (ash::Shell::HasInstance())
+    ash::Shell::GetInstance()->AddShellObserver(this);
 }
 
 Preferences::~Preferences() {
   prefs_->RemoveObserver(this);
+  // If shell instance is destoryed before this preferences instance, there is
+  // no need to remove this shell observer.
+  if (ash::Shell::HasInstance())
+    ash::Shell::GetInstance()->RemoveShellObserver(this);
 }
 
 // static
 void Preferences::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(prefs::kOwnerPrimaryMouseButtonRight, false);
   registry->RegisterBooleanPref(prefs::kOwnerTapToClickEnabled, true);
   registry->RegisterBooleanPref(prefs::kVirtualKeyboardEnabled, false);
 }
 
 // static
@@ skipping 332 matching lines @@
   registry->RegisterStringPref(
       prefs::kTermsOfServiceURL,
       "",
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 
   // TODO(achuith): Remove deprecated pref in M31. crbug.com/223480.
   registry->RegisterBooleanPref(
       kEnableTouchpadThreeFingerSwipe,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+
+  registry->RegisterBooleanPref(
+      prefs::kTouchHudProjectionEnabled,
+      false,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 void Preferences::InitUserPrefs(PrefServiceSyncable* prefs) {
   prefs_ = prefs;
 
   BooleanPrefMember::NamedChangeCallback callback =
       base::Bind(&Preferences::OnPreferenceChanged, base::Unretained(this));
 
   tap_to_click_enabled_.Init(prefs::kTapToClickEnabled, prefs, callback);
   tap_dragging_enabled_.Init(prefs::kTapDraggingEnabled, prefs, callback);
@@ skipping 17 matching lines @@
   disable_drive_over_cellular_.Init(prefs::kDisableDriveOverCellular,
                                     prefs, callback);
   disable_drive_hosted_files_.Init(prefs::kDisableDriveHostedFiles,
                                    prefs, callback);
   download_default_directory_.Init(prefs::kDownloadDefaultDirectory,
                                    prefs, callback);
   select_file_last_directory_.Init(prefs::kSelectFileLastDirectory,
                                    prefs, callback);
   save_file_default_directory_.Init(prefs::kSaveFileDefaultDirectory,
                                     prefs, callback);
+  touch_hud_projection_enabled_.Init(prefs::kTouchHudProjectionEnabled,
+                                     prefs, callback);
   primary_mouse_button_right_.Init(prefs::kPrimaryMouseButtonRight,
                                    prefs, callback);
   preferred_languages_.Init(prefs::kLanguagePreferredLanguages,
                             prefs, callback);
   preload_engines_.Init(prefs::kLanguagePreloadEngines, prefs, callback);
   enabled_extension_imes_.Init(prefs::kLanguageEnabledExtensionImes,
                                prefs, callback);
   current_input_method_.Init(prefs::kLanguageCurrentInputMethod,
                              prefs, callback);
   previous_input_method_.Init(prefs::kLanguagePreviousInputMethod,
@@ skipping 233 matching lines @@
   if (!pref_name || *pref_name == prefs::kSaveFileDefaultDirectory) {
     const base::FilePath pref_path = save_file_default_directory_.GetValue();
     // This pref can contain a Drive path, which needs to be updated due to
     // namespaces introduced by crbug.com/174233.
     // TODO(haruki): Remove this when migration completes. crbug.com/229304.
     if (drive::util::NeedsNamespaceMigration(pref_path)) {
       prefs_->SetFilePath(prefs::kSaveFileDefaultDirectory,
                           drive::util::ConvertToMyDriveNamespace(pref_path));
     }
   }
+  if (!pref_name || *pref_name == prefs::kTouchHudProjectionEnabled) {
+    const bool enabled = touch_hud_projection_enabled_.GetValue();
+    ash::Shell::GetInstance()->SetTouchHudProjectionEnabled(enabled);
+  }
 
   if (!pref_name || *pref_name == prefs::kLanguagePreferredLanguages) {
     // Unlike kLanguagePreloadEngines and some other input method
     // preferencs, we don't need to send this to ibus-daemon.
   }
 
   if (!pref_name || *pref_name == prefs::kLanguageXkbAutoRepeatEnabled) {
     const bool enabled = xkb_auto_repeat_enabled_.GetValue();
     input_method::XKeyboard::SetAutoRepeatEnabled(enabled);
   }
@@ skipping 305 matching lines @@
     return;
 
   input_method::AutoRepeatRate rate;
   rate.initial_delay_in_ms = xkb_auto_repeat_delay_pref_.GetValue();
   rate.repeat_interval_in_ms = xkb_auto_repeat_interval_pref_.GetValue();
   DCHECK(rate.initial_delay_in_ms > 0);
   DCHECK(rate.repeat_interval_in_ms > 0);
   input_method::XKeyboard::SetAutoRepeatRate(rate);
 }
 
+void Preferences::OnTouchHudProjectionToggled(bool enabled) {
+  if (touch_hud_projection_enabled_.GetValue() == enabled)
+    return;
+
+  touch_hud_projection_enabled_.SetValue(enabled);
+}
+
 }  // namespace chromeos