ash/accessibility_delegate.h

   1 // Copyright 2013 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 ASH_ACCESSIBILITY_DELEGATE_H_
   6 #define ASH_ACCESSIBILITY_DELEGATE_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "base/time/time.h"
  10 #include "ui/chromeos/accessibility_types.h"
  11
  12 namespace ash {
  13
  14 // A delegate class to control and query accessibility features.
  15 class ASH_EXPORT AccessibilityDelegate {
  16  public:
  17   virtual ~AccessibilityDelegate() {}
  18
  19   // Invoked to toggle spoken feedback for accessibility
  20   virtual void ToggleSpokenFeedback(
  21       ui::AccessibilityNotificationVisibility notify) = 0;
  22
  23   // Returns true if spoken feedback is enabled.
  24   virtual bool IsSpokenFeedbackEnabled() const = 0;
  25
  26   // Invoked to toggle high contrast mode for accessibility.
  27   virtual void ToggleHighContrast() = 0;
  28
  29   // Returns true if high contrast mode is enabled.
  30   virtual bool IsHighContrastEnabled() const = 0;
  31
  32   // Invoked to enable the screen magnifier.
  33   virtual void SetMagnifierEnabled(bool enabled) = 0;
  34
  35   // Invoked to change the type of the screen magnifier.
  36   virtual void SetMagnifierType(ui::MagnifierType type) = 0;
  37
  38   // Returns true if the screen magnifier is enabled.
  39   virtual bool IsMagnifierEnabled() const = 0;
  40
  41   // Returns the current screen magnifier mode.
  42   virtual ui::MagnifierType GetMagnifierType() const = 0;
  43
  44   // Invoked to enable Large Cursor.
  45   virtual void SetLargeCursorEnabled(bool enabled) = 0;
  46
  47   // Returns ture if Large Cursor is enabled.
  48   virtual bool IsLargeCursorEnabled() const = 0;
  49
  50   // Invoked to enable autoclick.
  51   virtual void SetAutoclickEnabled(bool enabled) = 0;
  52
  53   // Returns if autoclick is enabled or not.
  54   virtual bool IsAutoclickEnabled() const = 0;
  55
  56   // Invoked to enable or disable the a11y on-screen keyboard.
  57   virtual void SetVirtualKeyboardEnabled(bool enabled) = 0;
  58
  59   // Returns if the a11y virtual keyboard is enabled.
  60   virtual bool IsVirtualKeyboardEnabled() const = 0;
  61
  62   // Returns true when the accessibility menu should be shown.
  63   virtual bool ShouldShowAccessibilityMenu() const = 0;
  64
  65   // Returns true if a braille display is connected to the system.
  66   virtual bool IsBrailleDisplayConnected() const = 0;
  67
  68   // Cancel all current and queued speech immediately.
  69   virtual void SilenceSpokenFeedback() const = 0;
  70
  71   // Saves the zoom scale of the full screen magnifier.
  72   virtual void SaveScreenMagnifierScale(double scale) = 0;
  73
  74   // Gets a saved value of the zoom scale of full screen magnifier. If a value
  75   // is not saved, return a negative value.
  76   virtual double GetSavedScreenMagnifierScale() = 0;
  77
  78   // Triggers an accessibility alert to give the user feedback.
  79   virtual void TriggerAccessibilityAlert(ui::AccessibilityAlert alert) = 0;
  80
  81   // Gets the last accessibility alert that was triggered.
  82   virtual ui::AccessibilityAlert GetLastAccessibilityAlert() = 0;
  83
  84   // Plays an earcon. Earcons are brief and distinctive sounds that indicate
  85   // when their mapped event has occurred. The sound key enums can be found in
  86   // chromeos/audio/chromeos_sounds.h.
  87   virtual void PlayEarcon(int sound_key) = 0;
  88
  89   // Initiates play of shutdown sound and returns it's duration.
  90   virtual base::TimeDelta PlayShutdownSound() const = 0;
  91 };
  92
  93 }  // namespace ash
  94
  95 #endif  // ASH_ACCESSIBILITY_DELEGATE_H_