Implement chrome.brailleDisplayPrivate API

chrome/browser/extensions/api/braille_private/braille_controller.h

+// Copyright (c) 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_PRIVATE_BRAILLE_CONTROLLER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_BRAILLE_PRIVATE_BRAILLE_CONTROLLER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+
+namespace extensions {
+namespace api {
+namespace braille_private {
+class BrailleController {
+ public:
+  class Observer {
+   public:
+    virtual void OnKeyEvent(scoped_ptr<base::DictionaryValue> event) {};
+  };
+
+  static void AddWindow(unsigned long windowId);
+  static void RemoveWindow(unsigned long windowId);
+  static BrailleController* GetInstance();
+
+  virtual scoped_ptr<base::DictionaryValue> GetDisplayState() = 0;
+  virtual void WriteText(const std::string& text, int cursor) = 0;
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+ protected:
+  BrailleController();
+  virtual ~BrailleController();
+  virtual void AddWindowOnIOThread(unsigned long windowId) = 0;
+  virtual void RemoveWindowOnIOThread(unsigned long windowId) = 0;
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BrailleController);
+};
+}  // namespace braille_private
+}  // namespace api
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_BRAILLE_PRIVATE_BRAILLE_CONTROLLER_H_