components/exo/keyboard.h

// Copyright 2015 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 COMPONENTS_EXO_KEYBOARD_H_
#define COMPONENTS_EXO_KEYBOARD_H_

#include <vector>

#include "base/macros.h"
#include "components/exo/surface_observer.h"
#include "ui/aura/client/focus_change_observer.h"
#include "ui/events/event_handler.h"

namespace ui {
enum class DomCode;
class Event;
class KeyEvent;
}

namespace exo {
class KeyboardDelegate;
class Surface;

// This class implements a client keyboard that represents one or more keyboard
// devices.
class Keyboard : public ui::EventHandler,
                 public aura::client::FocusChangeObserver,
                 public SurfaceObserver {
 public:
  explicit Keyboard(KeyboardDelegate* delegate);
  ~Keyboard() override;

  // Overridden from ui::EventHandler:
  void OnKeyEvent(ui::KeyEvent* event) override;

  // Overridden aura::client::FocusChangeObserver:
  void OnWindowFocused(aura::Window* gained_focus,
                       aura::Window* lost_focus) override;

  // Overridden from SurfaceObserver:
  void OnSurfaceDestroying(Surface* surface) override;

 private:
  // Returns the effective focus for |window|.
  Surface* GetEffectiveFocus(aura::Window* window) const;

  // The delegate instance that all events are dispatched to.
  KeyboardDelegate* delegate_;

  // The current focus surface for the keyboard.
  Surface* focus_;

  // Vector of currently pressed keys.
  std::vector<ui::DomCode> pressed_keys_;

  // Current set of modifier flags.
  int modifier_flags_;

  DISALLOW_COPY_AND_ASSIGN(Keyboard);
};

}  // namespace exo

#endif  // COMPONENTS_EXO_KEYBOARD_H_