chrome/browser/chromeos/accessibility/magnification_manager.h

   1 // Copyright (c) 2012 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 #ifndef CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_
   6 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_
   7
   8 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
   9
  10 class Profile;
  11
  12 namespace chromeos {
  13
  14 // MagnificationManager controls the full screen magnifier from chrome-browser
  15 // side (not ash side).
  16 //
  17 // MagnificationManager does:
  18 //   - Watch logged-in. Changes the behavior between the login screen and user
  19 //     desktop.
  20 //   - Watch change of the pref. When the pref changes, the setting of the
  21 //     magnifier will interlock with it.
  22
  23 class MagnificationManager {
  24  public:
  25   // Creates an instance of MagnificationManager. This should be called once,
  26   // Returns the existing instance. If there is no instance, creates one.
  27   // because only one instance should exist at the same time.
  28   static void Initialize();
  29
  30   // Deletes the existing instance of MagnificationManager.
  31   static void Shutdown();
  32
  33   // Returns the existing instance. If there is no instance, returns NULL.
  34   static MagnificationManager* Get();
  35
  36   // Returns if the screen magnifier is enabled.
  37   virtual bool IsMagnifierEnabled() const = 0;
  38
  39   // Returns the current type of the screen magnifier.
  40   virtual ui::MagnifierType GetMagnifierType() const = 0;
  41
  42   // Enables the screen magnifier.
  43   virtual void SetMagnifierEnabled(bool enabled) = 0;
  44
  45   // Changes the type of the screen magnifier.
  46   virtual void SetMagnifierType(ui::MagnifierType type) = 0;
  47
  48   // Saves the magnifier scale to the pref.
  49   virtual void SaveScreenMagnifierScale(double scale) = 0;
  50
  51   // Loads the magnifier scale from the pref.
  52   virtual double GetSavedScreenMagnifierScale() const = 0;
  53
  54   virtual void SetProfileForTest(Profile* profile) = 0;
  55
  56  protected:
  57   virtual ~MagnificationManager() {}
  58 };
  59
  60 }  // namespace chromeos
  61
  62 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_