components/exo/gamepad_delegate.h

// Copyright 2016 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_GAMEPAD_DELEGATE_H_
#define COMPONENTS_EXO_GAMEPAD_DELEGATE_H_

namespace exo {

// Handles events for a specific gamepad.
class GamepadDelegate {
 public:
  // Called when the gamepad has been removed.
  virtual void OnRemoved() = 0;

  // Called when the user moved an axis of the gamepad. Valid axes are defined
  // by the W3C 'standard gamepad' specification.
  virtual void OnAxis(int axis, int raw_axis, double value) = 0;

  // Called when the user pressed or moved a button of the gamepad.
  // Valid buttons are defined by the W3C 'standard gamepad' specification.
  virtual void OnButton(int button,
                        int raw_button,
                        bool pressed,
                        double value) = 0;

  // Called after all gamepad information of this frame has been set and the
  // client should evaluate the updated state.
  virtual void OnFrame() = 0;

 protected:
  virtual ~GamepadDelegate() {}
};

}  // namespace exo

#endif  // COMPONENTS_EXO_GAMEPAD_DELEGATE_H_