chrome/browser/extensions/api/braille_display_private/braille_controller.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 CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_H_
   6 #define CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback_forward.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/values.h"
  14 #include "chrome/common/extensions/api/braille_display_private.h"
  15
  16 namespace extensions {
  17 namespace api {
  18 namespace braille_display_private {
  19 class BrailleObserver;
  20
  21 // Singleton class that controls the braille display.
  22 class BrailleController {
  23  public:
  24   static BrailleController* GetInstance();
  25
  26   virtual scoped_ptr<DisplayState> GetDisplayState() = 0;
  27   virtual void WriteDots(const std::vector<char>& cells) = 0;
  28   virtual void AddObserver(BrailleObserver* observer) = 0;
  29   virtual void RemoveObserver(BrailleObserver* observer) = 0;
  30
  31  protected:
  32   BrailleController();
  33   virtual ~BrailleController();
  34
  35  private:
  36   DISALLOW_COPY_AND_ASSIGN(BrailleController);
  37 };
  38
  39 // Observer for events from the BrailleController
  40 class BrailleObserver {
  41  public:
  42   virtual void OnBrailleDisplayStateChanged(
  43       const DisplayState& display_state) {}
  44   virtual void OnBrailleKeyEvent(const KeyEvent& event) {}
  45 };
  46
  47 }  // namespace braille_display_private
  48 }  // namespace api
  49 }  // namespace extensions
  50
  51 #endif  // CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_H_