| // Copyright 2013 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_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_H_ |
| #define CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_H_ |
| |
| #include <string> |
| |
| #include "base/basictypes.h" |
| #include "base/callback_forward.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/values.h" |
| #include "chrome/common/extensions/api/braille_display_private.h" |
| |
| namespace extensions { |
| namespace api { |
| namespace braille_display_private { |
| class BrailleObserver; |
| |
| // Singleton class that controls the braille display. |
| class BrailleController { |
| public: |
| static BrailleController* GetInstance(); |
| |
| virtual scoped_ptr<DisplayState> GetDisplayState() = 0; |
| virtual void WriteDots(const std::string& cells) = 0; |
| virtual void AddObserver(BrailleObserver* observer) = 0; |
| virtual void RemoveObserver(BrailleObserver* observer) = 0; |
| |
| protected: |
| BrailleController(); |
| virtual ~BrailleController(); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(BrailleController); |
| }; |
| |
| // Observer for events from the BrailleController |
| class BrailleObserver { |
| public: |
| virtual void OnDisplayStateChanged(const DisplayState& display_state) {} |
| virtual void OnKeyEvent(const KeyEvent& event) {} |
| }; |
| |
| } // namespace braille_display_private |
| } // namespace api |
| } // namespace extensions |
| |
| #endif // CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_H_ |