Enabled/disable touch screen in TabletPowerButtonController

chrome/browser/chromeos/system/input_device_settings.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_SYSTEM_INPUT_DEVICE_SETTINGS_H_
 #define CHROME_BROWSER_CHROMEOS_SYSTEM_INPUT_DEVICE_SETTINGS_H_
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "chromeos/chromeos_export.h"
@@ skipping 156 matching lines @@
 
   virtual ~InputDeviceSettings() {}
 
   // Returns current instance of InputDeviceSettings.
   static InputDeviceSettings* Get();
 
   // Returns true if UI should implement enhanced keyboard support for cases
   // where other input devices like mouse are absent.
   static bool ForceKeyboardDrivenUINavigation();
 
-  // Registers profile pref names for touchpad and touch screen statuses.
+  // Registers local state pref names for touchscreen status.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
+  // Registers profile pref names for touchpad and touchscreen statuses.
   static void RegisterProfilePrefs(PrefRegistrySimple* registry);
 
-  // Updates the on/off status of the touchscreen/touchpad from the active
-  // user's preferences.
-  void UpdateTouchDevicesStatusFromActiveProfilePrefs();
+  // Updates the enabled/disabled status of the touchscreen/touchpad from the
+  // preferences.
+  void UpdateTouchDevicesStatusFromPrefs();
 
-  // Toggles the status of Touchscreen/Touchpad on or off and updates the local
+  // If |use_local_state| is true, returns the touchscreen status from local
+  // state, otherwise from user prefs.
+  bool IsTouchscreenEnabledInPrefs(bool use_local_state) const;
+
+  // Sets the status of touchscreen to |enabled| in prefs. If |use_local_state|,
+  // pref is set in local state, otherwise in user pref.
+  void SetTouchscreenEnabledInPrefs(bool enabled, bool use_local_state);
+
+  // Updates the enabled/disabled status of the touchscreen from prefs. Enabled
+  // if both local state and user prefs are enabled, otherwise disabled.
+  void UpdateTouchscreenStatusFromPrefs();
+
+  // Toggles the status of touchpad enabled or disabled and updates the user

[Daniel Erat, 2016/12/03 03:11:55]

nit: "... between enabled and disabled"

   // prefs.
-  void ToggleTouchscreen();
   void ToggleTouchpad();
 
   // Calls |callback|, possibly asynchronously, after determining if a touchpad
   // is connected.
   virtual void TouchpadExists(const DeviceExistsCallback& callback) = 0;
 
   // Updates several touchpad settings at a time. Updates only settings that
   // are set in |settings| object. It is more efficient to use this method to
   // update several settings then calling Set* methods one by one.
   virtual void UpdateTouchpadSettings(const TouchpadSettings& settings) = 0;
@@ skipping 41 matching lines @@
 
  private:
   virtual void SetInternalTouchpadEnabled(bool enabled) {}
   virtual void SetTouchscreensEnabled(bool enabled) {}
 };
 
 }  // namespace system
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_INPUT_DEVICE_SETTINGS_H_