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// Copyright 2013 The Chromium Authors
// 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 <memory>
#include <vector>
#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();
BrailleController(const BrailleController&) = delete;
BrailleController& operator=(const BrailleController&) = delete;
virtual std::unique_ptr<DisplayState> GetDisplayState() = 0;
virtual void WriteDots(const std::vector<uint8_t>& cells,
unsigned int cols,
unsigned int rows) = 0;
virtual void AddObserver(BrailleObserver* observer) = 0;
virtual void RemoveObserver(BrailleObserver* observer) = 0;
protected:
BrailleController() = default;
virtual ~BrailleController() = default;
};
// Observer for events from the BrailleController
class BrailleObserver {
public:
virtual void OnBrailleDisplayStateChanged(
const DisplayState& display_state) {}
virtual void OnBrailleKeyEvent(const KeyEvent& event) {}
};
} // namespace braille_display_private
} // namespace api
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_H_
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